Sample records for diamyl sulfoxide

  1. 21 CFR 524.660b - Dimethyl sulfoxide gel.


    ... 21 Food and Drugs 6 2010-04-01 2010-04-01 false Dimethyl sulfoxide gel. 524.660b Section 524.660b... Dimethyl sulfoxide gel. (a) Specifications. Dimethyl sulfoxide gel, veterinary contains 90 percent dimethyl sulfoxide in an aqueous gel. (b) Sponsor. See No. 000856 in § 510.600(c) of this chapter. (c) Conditions...

  2. Enantiopure sulfoxides: recent applications in asymmetric synthesis.

    Carreño, M Carmen; Hernández-Torres, Gloria; Ribagorda, María; Urbano, Antonio


    Sulfoxides are nowadays recognised as powerful chiral auxiliaries that may participate in a wide range of asymmetric reactions. Their high configurational stability, the existence of several efficient methods allowing the access to both configurations as well as their synthetic versatility are characteristic features offering a tremendous potential to develop new applications. Significant recent advances leading to high asymmetric inductions in carbon-carbon and carbon-oxygen bond forming reactions, and applications of homochiral sulfoxides to atroposelective synthesis and asymmetric catalysis are discussed. New uses of sulfoxides in the design of chiroptical switches are also shown.

  3. Toxicity of dimethyl sulfoxide (DMSO) to fish

    Willford, W.A


    Toxicities of dimethyl sulfoxide (DMSO) to rainbow trout, brook trout, lake trout, carp, black bullhead, channel catfish, green sunfish, bluegill, and yellow perch were determined in 24-, 48-, and 96-hour static bioassays at 12 C...

  4. Revisiting optical clearing with dimethyl sulfoxide (DMSO)

    Bui, Albert K.; McClure, R. Anthony; Chang, Jennell; Stoianovici, Charles; Hirshburg, Jason; Yeh, Alvin T.; Choi, Bernard


    Functional optical characterization of disease progression and response to therapy suffers from loss of spatial resolution and imaging depth due to scattering. Here we report on the ability of dimethyl sulfoxide (DMSO) alone to reduce the optical scattering of skin. We observed a three-fold reduction in the scattering of skin with topical DMSO application. With an in vivo window chamber model, we observed a three-fold increase in light transmittance through the preparation and enhanced visualization of subsurface microvasculature. Collectively, our data demonstrate the potential of DMSO alone to mitigate effects of scattering, which we expect will improve molecular imaging studies. PMID:19226579

  5. Development of chiral sulfoxide ligands for asymmetric catalysis.

    Trost, Barry M; Rao, Meera


    Nitrogen-, phosphorus-, and oxygen-based ligands with chiral backbones have been the historic workhorses of asymmetric transition-metal-catalyzed reactions. On the contrary, sulfoxides containing chirality at the sulfur atom have mainly been used as chiral auxiliaries for diastereoselective reactions. Despite several distinct advantages over traditional ligand scaffolds, such as the proximity of the chiral information to the metal center and the ability to switch between S and O coordination, these compounds have only recently emerged as a versatile class of chiral ligands. In this Review, we detail the history of the development of chiral sulfoxide ligands for asymmetric catalysis. We also provide brief descriptions of metal-sulfoxide bonding and strategies for the synthesis of enantiopure sulfoxides. Finally, insights into the future development of this underutilized ligand class are discussed.

  6. Thermal Sensitivity and Dimethyl Sulfoxide (DMSO).

    Takeda, Kotaro; Pokorski, Mieczyslaw; Okada, Yasumasa


    Dimethyl sulfoxide (DMSO) is commonly used as a solvent for hydrophobic substances, but the compound's innate bioactivity is an area of limited understanding. In this investigation we seek to determine the analgesic potential of DMSO. We addressed the issue by assessing the perception of thermal pain stimulus, using a 55 °C hotplate design, in conscious mice. The latency of withdrawal behaviors over a range of incremental accumulative intraperitoneal DMSO doses (0.5-15.5 g/kg) in the same mouse was taken as a measure of thermal endurance. The findings were that the latency, on average, amounted to 15-30 s and it differed inappreciably between the sequential DMSO conditions. Nor was it different from the pre-DMSO control conditions. Thus, DMSO did not influence the cutaneous thermal pain perception. The findings do not lend support to those literature reports that point to the plausible antinociceptive potential of DMSO as one of a plethora of its innate bioactivities. However, the findings concern the mouse's footpad nociceptors which have specific morphology and stimulus transduction pathways, which cannot exclude DMSO's antinociceptive influence on other types of pain or in other types of skin. Complex and as yet unresolved neural mechanisms of perception of cutaneous noxious heat stimulus should be further explored with alternative experimental designs.

  7. Chiral cyclopentadienylruthenium sulfoxide catalysts for asymmetric redox bicycloisomerization

    Ryan, Michael C; Rao, Meera


    Summary A full account of our efforts toward an asymmetric redox bicycloisomerization reaction is presented in this article. Cyclopentadienylruthenium (CpRu) complexes containing tethered chiral sulfoxides were synthesized via an oxidative [3 + 2] cycloaddition reaction between an alkyne and an allylruthenium complex. Sulfoxide complex 1 containing a p-anisole moiety on its sulfoxide proved to be the most efficient and selective catalyst for the asymmetric redox bicycloisomerization of 1,6- and 1,7-enynes. This complex was used to synthesize a broad array of [3.1.0] and [4.1.0] bicycles. Sulfonamide- and phosphoramidate-containing products could be deprotected under reducing conditions. Catalysis performed with enantiomerically enriched propargyl alcohols revealed a matched/mismatched effect that was strongly dependent on the nature of the solvent. PMID:27559366

  8. Mechanism of extracting palladium(Ⅱ) with cyclic sulfoxide derivatives

    吴松平; 孟淑媛; 古国榜; 庄志强; 刘会冲


    The extraction ability of palladium( Ⅱ ) from acidic media with cyclic sulfoxide derivatives-α-Dodecyl-tetrahydrothiophene 1-Oxide (DTMSO), α-octyl-tetrahydrothiophene 1-Oxide (OTMSO) and α-butyl-tetrahydro-thiophene-1-Oxide (BTMSO) was investigated. The extracting efficiency of cyclic sulfoxide derivatives decreased with the increasing of acidity in the lower acidity, and the efficiency became stable with the change of acidity in the higher acidity. The extraction reaction of palladium( Ⅱ )with DTMSO is exothermic, and extraction reaction of pal-ladium( Ⅱ ) is endothermic when OTMSO or BTMSO were used as extracting reagents. The coordination number was studied by slope method. The results indicate that coordination number is 2, and the composition of complex is Pd is coordinated with both oxygen and sulfur atom in S=O group in sulfoxide derivatives.

  9. Chiral cyclopentadienylruthenium sulfoxide catalysts for asymmetric redox bicycloisomerization

    Barry M. Trost


    Full Text Available A full account of our efforts toward an asymmetric redox bicycloisomerization reaction is presented in this article. Cyclopentadienylruthenium (CpRu complexes containing tethered chiral sulfoxides were synthesized via an oxidative [3 + 2] cycloaddition reaction between an alkyne and an allylruthenium complex. Sulfoxide complex 1 containing a p-anisole moiety on its sulfoxide proved to be the most efficient and selective catalyst for the asymmetric redox bicycloisomerization of 1,6- and 1,7-enynes. This complex was used to synthesize a broad array of [3.1.0] and [4.1.0] bicycles. Sulfonamide- and phosphoramidate-containing products could be deprotected under reducing conditions. Catalysis performed with enantiomerically enriched propargyl alcohols revealed a matched/mismatched effect that was strongly dependent on the nature of the solvent.

  10. Experimental facility for radiation sulfoxidation of n-paraffins

    Drozdov, A.S.; Dzhagatspanyan, R.V.; Lyaskin, Yu.G.; Soin, A.L.; Soboler, I.A.


    Sulfoxidation of n-paraffins represents practical interest as a method for direct production of alkanesulfonic acids from n-paraffins and gaseous SO/sub 2/ and O/sub 2/; alkanesulfonic acids are intermediates for synthesis of valuable biodegradable surface-active substances - sodium alkane sulfonates, which are widely used as the basis for synthetic detergents and as emulsifiers and polymerization processes. A special feature of the sulfoxidation process is the fact that the intermediate and end products, being sparingly soluble in paraffins, are separated into a separate, acid phase. On the one hand, this leads to an increase of the yield of di- and polysulfonic acids and, on the other hand, to resinification of the reaction mixture as a result of the acceleration of side processes in the acid phase. From this follows the need for rapid separation of the reaction products from the paraffin phase and prevention of side processes leading to resinification. When the sulfoxidation process is initiated photochemically, this condition is realized by the introduction of water into the reaction zone; water extracts the end products and breaks down the intermediate compound - alkanepersulfonic acids - via the reaction: H/sub 2/O + SO/sub 2/ + RSO/sub 2/O/sub 2/H ..-->.. RSO/sub 3/H + H/sub 2/SO/sub 4/. However, while decomposing the persulfonic acids, water prevents development of a degenerate-branched chain process. As a result, the reaction takes place with short unbranched chains with low quantum yield, which results in high energy costs for photochemical sulfoxidation. The radiation method of initiating the sulfoxidation reaction is attractive because of the possibility of carrying out the process in a regime of degenerate chain branching.

  11. Hexakis(dimethyl sulfoxide-κOcobalt(III trinitrate

    Qiuhong Li


    Full Text Available The metal atom of the title salt, [Co(C2H6OS6](NO33, is coordinated by six dimethyl sulfoxide molecules in an octahedral geometry. The metal atom lies on a special position of overline{3} site symmetry. One of the nitrate ions lies on a special position of 3 site symmetry and the other independent ion is disordered about a special position of overline{3} site symmetry.

  12. In vivo evaluation of the efficacy of albendazole sulfoxide and albendazole sulfoxide loaded solid lipid nanoparticles against hydatid cyst.

    Ahmadnia, Sara; Moazeni, Mohammad; Mohammadi-Samani, Soliman; Oryan, Ahmad


    Cystic echinococcosis (CE) is caused by the larval stage of Echinococcus granulosus, which in this disease the metacestode develop in visceral organs especially liver and lungs. The disease is present worldwide and affects humans as well as herbivores including cattle, sheep, camels, horses and others. Benzimidazole carbamate derivatives, such as mebendazole and albendazole, are currently used for chemotherapeutic treatment of CE in inoperable patients and have to be applied in high doses for extended periods of time, and therefore adverse side effects are frequently observed. This study was designed to evaluate and compare the in vivo effects of 0.5 mg/kg, BID, albendazole sulfoxide (ricobendazole) and two different therapeutic regimens of 0.5 mg/kg BID and 2 mg/kg every 48 h of albendazole sulfoxide loaded solid lipid nanoparticles. Albendazole sulfoxide loaded solid lipid nanoparticles was prepared by solvent diffusion-evaporation method. Fifty Balb/c mice were infected by intraperitoneal injection of protoscoleces and 8 months post infection, the infected mice were treated for 15 days with the above mentioned regimens. They were then euthanized and the size and weight of the cysts as well as their ultrastructural changes were investigated. Although the cysts showed reduced size and weight in the treated animals but these reductions were not statistically significant. The cysts in the animals which received albendazole sulfoxide loaded SLN every 48 h showed more ultrastructural modification. However, these ultrastructural changes should be supported by further biochemical and molecular studies before introducing it as an efficient therapeutic regimen for treatment of human and animal hydatid disease.

  13. Novel Reaction of Some Azoles with Dimethyl Sulfoxid

    WANG,Bin; ZHU,An-Xiong; DONG,Heng-Shan


    @@ The compounds 4a~4j were prepared by 3a~3j which were prepared from 1a~1j through 2a~2j. The compounds 6a~6j were prepared by the reaction of the products of 4a~4j with dimethyl sulfoxid via Dimroth rearrangement.[1] The compounds ethyl 5-arylamino-1H-1,2,3-triazol-4-carbonates (5a~5d) and ethyl 2-methylthiamethylene-5-arylamino-2H-1,2,3-triazol-4-carbonates (6a~6j) are established by MS, IR, elemental analysis and 1H NMR spectral data. The route of syntheses is shown in Scheme 1.

  14. Bisguanidinium dinuclear oxodiperoxomolybdosulfate ion pair-catalyzed enantioselective sulfoxidation

    Zong, Lili; Wang, Chao; Moeljadi, Adhitya Mangala Putra; Ye, Xinyi; Ganguly, Rakesh; Li, Yongxin; Hirao, Hajime; Tan, Choon-Hong


    Catalytic use of peroxomolybdate for asymmetric transformations has attracted increasing attention due to its catalytic properties and application in catalysis. Herein, we report chiral bisguanidinium dinuclear oxodiperoxomolybdosulfate [BG]2+[(μ-SO4)Mo2O2(μ-O2)2(O2)2]2− ion pair, as a catalyst for enantioselective sulfoxidation using aqueous H2O2 as the terminal oxidant. The ion pair catalyst is isolatable, stable and useful for the oxidation of a range of dialkyl sulfides. The practical uti...

  15. 21 CFR 524.981d - Fluocinolone acetonide, dimethyl sulfoxide solution.


    ... 21 Food and Drugs 6 2010-04-01 2010-04-01 false Fluocinolone acetonide, dimethyl sulfoxide solution. 524.981d Section 524.981d Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND... NEW ANIMAL DRUGS § 524.981d Fluocinolone acetonide, dimethyl sulfoxide solution. (a)...

  16. Lithium solvation in dimethyl sulfoxide-acetonitrile mixtures

    Semino, Rocío; Zaldívar, Gervasio; Calvo, Ernesto J. [Departamento de Química Inorgánica Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428 Buenos Aires (Argentina); Laria, Daniel, E-mail: [Departamento de Química Inorgánica Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428 Buenos Aires (Argentina); Departamento de Física de la Materia Condensada, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429 Buenos Aires (Argentina)


    We present molecular dynamics simulation results pertaining to the solvation of Li{sup +} in dimethyl sulfoxide-acetonitrile binary mixtures. The results are potentially relevant in the design of Li-air batteries that rely on aprotic mixtures as solvent media. To analyze effects derived from differences in ionic size and charge sign, the solvation of Li{sup +} is compared to the ones observed for infinitely diluted K{sup +} and Cl{sup −} species, in similar solutions. At all compositions, the cations are preferentially solvated by dimethyl sulfoxide. Contrasting, the first solvation shell of Cl{sup −} shows a gradual modification in its composition, which varies linearly with the global concentrations of the two solvents in the mixtures. Moreover, the energetics of the solvation, described in terms of the corresponding solute-solvent coupling, presents a clear non-ideal concentration dependence. Similar nonlinear trends were found for the stabilization of different ionic species in solution, compared to the ones exhibited by their electrically neutral counterparts. These tendencies account for the characteristics of the free energy associated to the stabilization of Li{sup +}Cl{sup −}, contact-ion-pairs in these solutions. Ionic transport is also analyzed. Dynamical results show concentration trends similar to those recently obtained from direct experimental measurements.

  17. Functional characterization of methionine sulfoxide reductase A from Trypanosoma spp.

    Arias, Diego G; Cabeza, Matías S; Erben, Esteban D; Carranza, Pedro G; Lujan, Hugo D; Téllez Iñón, María T; Iglesias, Alberto A; Guerrero, Sergio A


    Methionine is an amino acid susceptible to being oxidized to methionine sulfoxide (MetSO). The reduction of MetSO to methionine is catalyzed by methionine sulfoxide reductase (MSR), an enzyme present in almost all organisms. In trypanosomatids, the study of antioxidant systems has been mainly focused on the involvement of trypanothione, a specific redox component in these organisms. However, no information is available concerning their mechanisms for repairing oxidized proteins, which would be relevant for the survival of these pathogens in the various stages of their life cycle. We report the molecular cloning of three genes encoding a putative A-type MSR in trypanosomatids. The genes were expressed in Escherichia coli, and the corresponding recombinant proteins were purified and functionally characterized. The enzymes were specific for L-Met(S)SO reduction, using Trypanosoma cruzi tryparedoxin I as the reducing substrate. Each enzyme migrated in electrophoresis with a particular profile reflecting the differences they exhibit in superficial charge. The in vivo presence of the enzymes was evidenced by immunological detection in replicative stages of T. cruzi and Trypanosoma brucei. The results support the occurrence of a metabolic pathway in Trypanosoma spp. involved in the critical function of repairing oxidized macromolecules.

  18. Enantiomeric behaviour of albendazole and fenbendazole sulfoxides in domestic animals: pharmacological implications.

    Capece, Bettencourt P S; Virkel, Guillermo L; Lanusse, Carlos E


    Albendazole and fenbendazole are methylcarbamate benzimidazole anthelmintics extensively used to control gastrointestinal parasites in domestic animals. These parent compounds are metabolised to albendazole sulfoxide and fenbendazole sulfoxide (oxfendazole), respectively. Both sulfoxide derivatives are anthelmintically active and are manufactured for use in animals. They metabolites have an asymmetric centre on their chemical structures and two enantiomeric forms of each sulfoxide have been identified in plasma, tissues of parasite location and within target helminths. Both the flavin-monooxygenase and cytochrome P450 systems are involved in the enantioselective biotransformation of these anthelmintic compounds in ruminant species. A relevant progress on the understanding of the relationship among enantioselective metabolism and systemic availability of each enantiomeric form has been achieved. This article reviews the current knowledge on the pharmacological implications of the enantiomeric behaviour of albendazole sulfoxide and oxfendazole in domestic animals.

  19. In vitro analysis of albendazole sulfoxide enantiomers shows that (+)-(R)-albendazole sulfoxide is the active enantiomer against Taenia solium.

    Paredes, Adriana; de Campos Lourenço, Tiago; Marzal, Miguel; Rivera, Andrea; Dorny, Pierre; Mahanty, Siddhartha; Guerra-Giraldez, Cristina; García, Hector H; Nash, Theodore E; Cass, Quezia B


    Albendazole is an anthelmintic drug widely used in the treatment of neurocysticercosis (NCC), an infection of the brain with Taenia solium cysts. However, drug levels of its active metabolite, albendazole sulfoxide (ABZSO), are erratic, likely resulting in decreased efficacy and suboptimal cure rates in NCC. Racemic albendazole sulfoxide is composed of ABZSO (+)-(R)- and (-)-(S) enantiomers that have been shown to differ in pharmacokinetics and activity against other helminths. The antiparasitic activities of racemic ABZSO and its (+)-(R)- and (-)-(S) enantiomers against T. solium cysts were evaluated in vitro. Parasites were collected from naturally infected pigs, cultured, and exposed to the racemic mixture or to each enantiomer (range, 10 to 500 ng/ml) or to praziquantel as a reference drug. The activity of each compound against cysts was assayed by measuring the ability to evaginate and inhibition of alkaline phosphatase (AP) and parasite antigen release. (+)-(R)-ABZSO was significantly more active than (-)-(S)-ABZSO in suppressing the release of AP and antigen into the supernatant in a dose- and time-dependent manner, indicating that most of the activity of ABZSO resides in the (+)-(R) enantiomer. Use of this enantiomer alone may lead to increased efficacy and/or less toxicity compared to albendazole.

  20. Bisguanidinium dinuclear oxodiperoxomolybdosulfate ion pair-catalyzed enantioselective sulfoxidation

    Zong, Lili; Wang, Chao; Moeljadi, Adhitya Mangala Putra; Ye, Xinyi; Ganguly, Rakesh; Li, Yongxin; Hirao, Hajime; Tan, Choon-Hong


    Catalytic use of peroxomolybdate for asymmetric transformations has attracted increasing attention due to its catalytic properties and application in catalysis. Herein, we report chiral bisguanidinium dinuclear oxodiperoxomolybdosulfate [BG]2+[(μ-SO4)Mo2O2(μ-O2)2(O2)2]2- ion pair, as a catalyst for enantioselective sulfoxidation using aqueous H2O2 as the terminal oxidant. The ion pair catalyst is isolatable, stable and useful for the oxidation of a range of dialkyl sulfides. The practical utility was illustrated using a gram-scale synthesis of armodafinil, a commercial drug, with the catalyst generated in situ from 0.25 mol% of bisguanidinium and 2.5 mol% of Na2MoO4.2H2O. Structural characterization of this ion pair catalyst has been successfully achieved using single-crystal X-ray crystallography.

  1. Synthesis and Adsorption Properties of Chelating Resins Containing Sulfoxide and Heterocyclic Functional Groups

    Chun Nuan JI; Xiu Juan ZHANG; Rong Jun QU; Hou CHEN; Chun Hua WANG; Chang Mei SUN


    Several of new chelating resins containing sulfoxide and heterocyclic functional groups (3-aminopyridine and 2-mercaptobenzothiazole) based on macroporous chloromethylated polystyrene were synthesized and characterized by elemental analysis and infrared spectra. Their adsorption capacities towards Zn2+, Cu2+, Pb2+, Hg2+ and Ag+ at pH 3.0 and 6.0 were investigated in detail. It was found that the adsorption capacities of the resins containing bis[(3-pyridylaminoethyl)sulfoxide or (2-benzothiazolylthioethyl)sulfoxide for the above ions were higher than that on ones containing single above-mentioned groups.

  2. Selective oxidation of glycosyl sulfides to sulfoxides using magnesium monoperoxyphthalate and microwave irradiation.

    Chen, Ming-Yi; Patkar, Laxmikant Narhari; Lin, Chun-Cheng


    A protocol that uses moist magnesium monoperoxyphthalate (MMPP) as an oxidant under microwave irradiation rapidly yields a variety of glycosyl sulfoxides from corresponding sulfides in high yields with high selectivity.

  3. Detection of Oxidation of L-Cysteine by Dimethyl Sulfoxide in Aqueous Solutions by IR Spectroscopy

    Papanyan, Z.; Markarian, S.


    We have used IR spectroscopy to study the reaction between L-cysteine and dimethyl sulfoxide in aqueous medium. We have found that reaction occurs with formation of an insoluble product, which we have identified. We show that oxidation of L-cysteine by dimethyl sulfoxide can occur at an appreciable rate under mild conditions, with formation of L-cystine, dimethyl sulfide, and water.

  4. Stereospecific micellar electrokinetic chromatography assay of methionine sulfoxide reductase activity employing a multiple layer coated capillary.

    Zhu, Qingfu; El-Mergawy, Rabab G; Heinemann, Stefan H; Schönherr, Roland; Jáč, Pavel; Scriba, Gerhard K E


    A micellar electrokinetic chromatography method for the analysis of the l-methionine sulfoxide diastereomers employing a successive multiple ionic-polymer layer coated fused-silica capillary was developed and validated in order to investigate the stereospecificity of methionine sulfoxide reductases. The capillary coating consisted of a first layer of hexadimethrine and a second layer of dextran sulfate providing a stable strong cathodic EOF and consequently highly repeatable analyte migration times. The methionine sulfoxide diastereomers, methionine as product as well as β-alanine as internal standard were derivatized by dabsyl chloride and separated using a 35 mM sodium phosphate buffer, pH 8.0, containing 25 mM SDS as BGE and a separation voltage of 25 kV. The method was validated in the range of 0.15-2.0 mM with respect to linearity and precision. The LODs of the analytes ranged between 0.04 and 0.10 mM. The assay was subsequently applied to determine the stereospecificity of methionine sulfoxide reductases as well as the enzyme kinetics of human methionine sulfoxide reductase A. Monitoring the decrease of the l-methionine-(S)-sulfoxide Km = 411.8 ± 33.8 μM and Vmax = 307.5 ± 10.8 μM/min were determined.

  5. Effect of sulfoxides on the thermal denaturation of hen lysozyme: A calorimetric and Raman study

    Torreggiani, A.; Di Foggia, M.; Manco, I.; De Maio, A.; Markarian, S. A.; Bonora, S.


    A multidisciplinary study of the thermal denaturation of lysozyme in the presence of three sulfoxides with different length in hydrocarbon chain (DMSO, DESO, and DPSO) was carried out by means of DSC, Raman spectroscopy, and SDS-PAGE techniques. In particular, the Td and Δ H values obtained from the calorimetric measurements showed that lysozyme is partially unfolded by sulfoxides but most of the conformation holds native state. The sulfoxide denaturing ability increases in the order DPSO > DESO > DMSO. Moreover, only DMSO and DESO have a real effect in preventing the heat-induced inactivation of the protein and their maximum heat-protective ability is reached when the DMSO and DESO amount is ⩾25% w/w. The sulfoxide ability to act as effective protective agents against the heat-induced inactivation was confirmed by the protein analysis. The enzymatic activity, as well as the SDS-PAGE analysis, suggested that DESO, having a low hydrophobic character and a great ability to stabilise the three-dimensional water structure, is the most heat-protective sulfoxide. An accurate evaluation of the heat-induced conformational changes of the lysozyme structure before and after sulfoxide addition was obtained by the analysis of the Raman spectra. The addition of DMSO or DESO in low concentration resulted to sensitively decrease the heat-induced structural modifications of the protein.

  6. Diapause prevention effect of Bombyx mori by dimethyl sulfoxide.

    Takayuki Yamamoto

    Full Text Available HCl treatment has been, for about 80 years, the primary method for the prevention of entry into embryonic diapauses of Bombyx mori. This is because no method is as effective as the HCl treatment. In this study, we discovered that dimethyl sulfoxide (DMSO prevented entry into the diapause of the silkworm, Bombyx mori. The effect of diapause prevention was 78% as a result of treatment with 100% DMSO concentration, and the effect was comparable to that of the HCl treatment. In contrast, in the case of non-diapause eggs, hatchability was decreased by DMSO in a concentration-dependent manner. The effect of DMSO was restricted within 24 hours after oviposition of diapause eggs, and the critical period was slightly shorter than the effective period of the HCl treatment. DMSO analogs, such as dimethyl formamide (DMF and dimethyl sulfide (DMS, did little preventive effect against the diapause. Furthermore, we also investigated the permeation effects of chemical compounds by DMSO. When treated with an inhibitor of protein kinase CK2 (CK2 dissolved in DMSO, the prevention rate of the diapause was less than 40%. This means that the inhibition effect by the CK2 inhibitor was the inhibition of embryonic development after diapause prevention by DMSO. These data suggest that DMSO has the effects of preventing from entering into the diapause and permeation of chemicals into diapause eggs.

  7. Erythromycin A dimethyl sulfoxide disolvate 1.43-hydrate

    Jan W. Bats


    Full Text Available The title compound, C37H67NO13·2C2H6OS·1.43H2O, is a macrolide antibiotic with better solubility and better dermal penetration abilities than erythromycin A itself. The asymmetric unit of this form contains one erythromycin A molecule, two dimethyl sulfoxide (DMSO solvent molecules, a fully occupied water molecule and a partially occupied water molecule with an occupancy factor of 0.432 (11. The 14-membered ring of the erythronolide fragment has a conformation which differs considerably from that in erythromycin A dihydrate [Stephenson, Stowell, Toma, Pfeiffer & Byrn (1997. J. Pharm. Sci. 86, 1239–1244]. One of the two DMSO molecules is disordered over two orientations; the orientation depends on the presence or absence of the second, partially occupied, water molecule. In the crystal, erythromycin molecules are connected by O—H...O hydrogen bonds involving the hydroxy groups and the fully occupied water molecule to form layers parallel to (010. These layers are connected along the b-axis direction only by a possible hydrogen-bonding contact involving the partially occupied water molecule.

  8. Expression of Four Methionine Sulfoxide Reductases in Staphylococcus aureus

    Kuldeep Singh


    Full Text Available Staphylococcus aureus possesses three MsrA enzymes (MsrA1, MsrA2, MsrA3 that reduce the S-epimer of methionine sulfoxide (MetO and an MsrB enzyme that reduces R-MetO. The four msr genes are expressed from three different promoters. The msrA1/msrB genes are coexpressed. To determine the expression pattern of msr genes, three independent reporter strains were constructed where msr promoter was cloned in front of a promoterless lacZ and the resulting construct was integrated in the chromosome. Using these strains, it was determined that the msrA1/B expression is significantly higher in S. aureus compared to msrA2 or msrA3. Expression of msrA1/B was highest during stationary phase growth, but the expression of msrA2 and msrA3 was highest during the early to midexponential growth phase. Expression of msrA1/B was induced by oxacillin and the expression of msrA3 was upregulated by salt. Expression of msrA2 remained unchanged under all tested conditions.

  9. Comparative hepatic and extrahepatic enantioselective sulfoxidation of albendazole and fenbendazole in sheep and cattle.

    Virkel, G; Lifschitz, A; Sallovitz, J; Pis, A; Lanusse, C


    The enantioselective sulfoxidation of the prochiral anthelmintic compounds albendazole (ABZ) and fenbendazole (FBZ) was investigated in liver, lung and small intestinal microsomes obtained from healthy sheep and cattle. The microsomal fractions were incubated with a 40 microM concentration of either ABZ or FBZ. Inhibition of the flavin-containing monooxygenase (FMO) system was carried out by preincubation with 100 microM methimazole (MTZ) either with or without heat pretreatment (2 min at 50 degrees C). ABZ and FBZ were metabolized to the (+) and (-) enantiomers of their sulfoxide metabolites, named albendazole sulfoxide (ABZSO) and oxfendazole (OFZ), respectively. ABZ sulfoxidation rates were higher (p < 0.001) than those observed for FBZ. The FMO-mediated liver sulfoxidation of ABZ was enantioselective (100%) toward the (+) ABZSO production in both species. Liver sulfoxidation of FBZ by FMO was also enantioselective toward (+) OFZ (sheep = 65%; cattle = 79%). Cytochrome P450 was found to be mainly involved in the production of (-) ABZSO in the liver. MTZ did not affect the sulfoxidation of ABZ by lung microsomes, which may indicate that FMO is not involved in the production of ABZSO in this tissue. A significant (p < 0.05) inhibition of (-) ABZSO production by liver microsomes was observed after ABZ incubation in the presence of erythromycin (cattle = 21%) and ketoconazole (sheep = 36%). Both CYP3A substrates induced a reduction in the production of (-) ABZSO (sheep = 67-78%, cattle = 50-78%) by lung microsomes. Overall, the results reported here contribute to the identification of the metabolic pathways involved in the biotransformation of benzimidazole anthelmintics extensively used for parasite control in ruminants.

  10. Effects of Dimethyl Sulfoxide on Surface Water near Phospholipid Bilayers.

    Lee, Yuno; Pincus, Philip A; Hyeon, Changbong


    Despite much effort to probe the properties of dimethyl sulfoxide (DMSO) solution, the effects of DMSO on water, especially near plasma membrane surfaces, still remain elusive. By performing molecular dynamics simulations at varying DMSO concentrations (XDMSO), we study how DMSO affects structural and dynamical properties of water in the vicinity of phospholipid bilayers. As proposed by a number of experiments, our simulations confirm that DMSO induces dehydration from bilayer surfaces and disrupts the H-bond structure of water. However, DMSO-enhanced water diffusivity at solvent-bilayer interfaces, an intriguing discovery reported by a spin-label measurement, is not confirmed in our simulations. To resolve this discrepancy, we examine the location of the spin label (Tempo) relative to the solvent-bilayer interface. In accord with the evidence in the literature, our simulations, which explicitly model Tempo-phosphatidylcholine, find that the Tempo moiety is equilibrated at ∼8-10 Å below the bilayer surface. Furthermore, the DMSO-enhanced surface-water diffusion is confirmed only when water diffusion is analyzed around the Tempo moiety that is immersed below the bilayer surface, which implies that the experimentally detected signal of water using Tempo stems from the interior of bilayers, not from the interface. Our analysis finds that the increase of water diffusion below the bilayer surface is coupled to the increase of area per lipid with an increasing XDMSO(≲10mol%). Underscoring the hydrophobic nature of the Tempo moiety, our study calls for careful re-evaluation of the use of Tempo in measurements on lipid bilayer surfaces. Copyright © 2016 Biophysical Society. Published by Elsevier Inc. All rights reserved.

  11. Molecular characteristics of amylose and starch in dimethyl sulfoxide.

    Radosta, S; Haberer, M; Vorwerg, W


    The aim of this work was the molecular characterization of starch polysaccharides to determine solution structure. Studies of amylose and potato starches of different origins were carried out by the static light scattering, dynamic light scattering, and HPSEC-MALLS methods. Molecular parameters such as Mw, Rg, A2, molar mass distribution, Dz, Rh, the structure-dependent rho-parameter, and osmotic modulus for amylose were determined. The Mw of amylose was found to be in the range from 1 x 10(5) to 1 x 10(6) g mol-1. The Mw of potato starches was much higher, that is, in the range of 23-37 x 10(6) g mol-1. The Rg of the amylose samples was in the range of 24-71 nm, and that of the potato starches was between 130 and 150 nm. The intensity-time correlation function showed one diffusive relaxation motion for amylose as well as for starch. The diffusion coefficients of the amylose prepared from starch by several methods were in the range of 2.7-9.1 x 10(-8) cm2 s-1, and those of the starches were 1 magnitude lower between 4.8 and 6.7 x 10(-9) cm2 s-1. The rho-parameter of amylose was calculated as having values between 1.5 and 2.2, and that of starches was calculated to be an average value of 0.62. The assumed solution behavior of amylose in dimethyl sulfoxide corresponds to that of a flexible chain, while the behavior of starch more closely resembles that of a spherelike structure.

  12. Determination of albendazole sulfoxide in human plasma by using liquid chromatography-tandem mass spectrometry.

    Saraner, Nihal; Özkan, Güler Yağmur; Güney, Berrak; Alkan, Erkin; Burul-Bozkurt, Nihan; Sağlam, Onursal; Fikirdeşici, Ezgi; Yıldırım, Mevlüt


    A rapid, simple and sensitive method was developed and validated using liquid chromatography-tandem mass spectrometry (LC-MS/MS) for determination of albendazole sulfoxide (ABZOX) in human plasma. The plasma samples were extracted by protein precipitation using albendazole sulfoxide-d3 as internal standard (IS). The chromatographic separation was performed on Waters Xbridge C18Column (100×4.6mm, 3.5μm) with a mobile phase consisting of ammonia solution, water and methanol at a flow rate of 0.70mL/min. ABZOX was detected and identified by mass spectrometry with electrospray ionization (ESI) in positive ion and multiple-reaction monitoring (MRM) mode. The method was linear in the range of 3-1500ng/mL for ABZOX. This method was successfully applied to the bioequivalence study in human plasma samples.

  13. Historical perspectives and the future of adverse reactions associated with haemopoietic stem cells cryopreserved with dimethyl sulfoxide

    Cox, Michael A; Kastrup, Jens; Hrubiško, Mikulas


    A retrospective review of the published literature identified several hundred adverse reactions (e.g. nausea, chills, cardiac arrhythmias, neurological symptoms and respiratory arrest) associated with the transplantation of stem cells cryopreserved with dimethyl sulfoxide. The occurrences of thes...... on the development of related European Directives, some technical aspects of dimethyl sulfoxide and the sequential stages of preservation and administration....

  14. 4-Hydroxyacetophenone monooxygenase from Pseudomonas fluorescens ACB as an oxidative biocatalyst in the synthesis of optically active sulfoxides

    Gonzalo, Gonzalo de; Torres Pazmiño, Daniel E.; Ottolina, Gianluca; Fraaije, Marco W.; Carrea, Giacomo


    Recombinant 4-hydroxyacetophenone monooxygenase (HAPMO) from Pseudomonas fluorescens ACB has been tested as a catalyst in sulfoxidation reactions on a set of aromatic sulfides. With a few exceptions, excellent enantioselectivities in the synthesis of chiral phenyl and benzyl sulfoxides were achieved

  15. Polycyclic Ketone Monooxygenase (PockeMO): A Robust Biocatalyst for the Synthesis of Optically Active Sulfoxides

    de Gonzalo, Gonzalo; Fürst, Maximilian; Fraaije, Marco


    A recently discovered, moderately thermostable Baeyer-Villiger monooxygenase, polycyclic ketone monooxygenase (PockeMO), from Thermothelomyces thermophila has been employed as a biocatalyst in a set of asymmetric sulfoxidations. The enzyme was able to catalyze the oxidation of various alkyl aryl

  16. Sulfide and sulfoxide oxidations by mono- and diperoxo complexes of molybdenum. A density functional study.

    Sensato, Fabrício R; Custodio, Rogério; Longo, E; Safont, Vicent S; Andres, Juan


    The molecular mechanism for the oxidation of sulfides to sulfoxides and subsequent oxidation to sulfones by diperoxo, MoO(O(2))(2)(OPH(3)) (I), and monoperoxo, MoO(2)(O(2))(OPH(3)) (II), complexes of molybdenum was studied using density functional calculations at the b3lyp level and the transition state theory. Complexes I and II were both found to be active species. Sulfide oxidation by I or II shows similar activation free energy values of 18.5 and 20.9 kcal/mol, respectively, whereas sulfoxides are oxidized by I (deltaG = 20.6 kcal/mol) rather than by II (deltaG = 30.3 kcal/mol). Calculated kinetic and thermodynamic parameters account for the spontaneous overoxidation of sulfides to sulfones as has been experimentally observed. The charge decomposition analysis (CDA) of the calculated transition structures of sulfide and sulfoxide oxidations revealed that I and II are stronger electrophilic oxidants toward sulfides than they are toward sulfoxides.

  17. Unusual nickel-mediated C-S cleavage of alkyl and aryl sulfoxides.

    Schaub, Thomas; Backes, Marc; Radius, Udo


    The first examples of transition metal mediated C-S cleavage of sulfoxides containing sp2- and sp3-hybridized carbon bonds attached to the sulfur atom and the first example of a structurally characterized complex featuring an oxygen-bound sulfinyl ligand are presented.

  18. Sulfoxide-directed intramolecular [4 + 2] cycloadditions between 2-sulfinyl butadienes and unactivated alkynes.

    Fernández de la Pradilla, Roberto; Tortosa, Mariola; Castellanos, Esther; Viso, Alma; Baile, Raquel


    Sulfinyl dienynes undergo thermal and catalyzed IMDA cycloadditions, often at room temperature, to produce cyclohexa-1,4-dienes with good yields and high selectivities. Additionally, the products preserve a synthetically useful vinyl sulfoxide functionality. The selective manipulation of the double bonds in the cycloadducts has also been examined in this work.

  19. A Click Chemistry Approach towards Flavin-Cyclodextrin Conjugates-Bioinspired Sulfoxidation Catalysts.

    Tomanová, Petra; Šturala, Jiří; Buděšínský, Miloš; Cibulka, Radek


    A click chemistry approach based on the reaction between alkynylflavins and mono(6-azido-6-deoxy)-β-cyclodextrin has proven to be a useful tool for the synthesis of flavin-cyclodextrin conjugates studied as monooxygenase mimics in enantioselective sulfoxidations.

  20. A Click Chemistry Approach towards Flavin-Cyclodextrin Conjugates—Bioinspired Sulfoxidation Catalysts

    Petra Tomanová; Jiří Šturala; Miloš Buděšínský; Radek Cibulka


    A click chemistry approach based on the reaction between alkynylflavins and mono(6-azido-6-deoxy)-β-cyclodextrin has proven to be a useful tool for the synthesis of flavin-cyclodextrin conjugates studied as monooxygenase mimics in enantioselective sulfoxidations.

  1. 21 CFR 524.981e - Fluocinolone acetonide, dimethyl sulfoxide otic solution.


    ... sensitivity testing, and the use of the appropriate antimicrobial agent. As with any corticosteroid, animals... antimicrobial therapy. Preparations with dimethyl sulfoxide should not be used in pregnant animals. For use by... HUMAN SERVICES (CONTINUED) ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS OPHTHALMIC AND TOPICAL DOSAGE...

  2. A Click Chemistry Approach towards Flavin-Cyclodextrin Conjugates—Bioinspired Sulfoxidation Catalysts

    Petra Tomanová


    Full Text Available A click chemistry approach based on the reaction between alkynylflavins and mono(6-azido-6-deoxy-β-cyclodextrin has proven to be a useful tool for the synthesis of flavin-cyclodextrin conjugates studied as monooxygenase mimics in enantioselective sulfoxidations.

  3. Extraction of urainum(VI) with di—(2—ethylhexyl) sulfoxide in toluene

    YangYan-Zhao; SunSi-Xiu; 等


    The mechanism of extraction uranium(VI) with di(2-ethylhexyl)sulfoxide(DEHSO) from aqueous nitric acid media has been studied.The influence of the concentrations of nitric acid,extractant,salting-out agent temperature and complex anions(C2O42-) on the distribution ratio was studied.

  4. Triclabendazole sulfoxide causes stage-dependent embryolethality in zebrafish and mouse in vitro.

    Nuria Boix

    Full Text Available Fascioliasis and paragonimiasis are widespread foodborne trematode diseases, affecting millions of people in more than 75 countries. The treatment of choice for these parasitic diseases is based on triclabendazole, a benzimidazole derivative which has been suggested as a promising drug to treat pregnant women and children. However, at the moment, this drug is not approved for human use in most countries. Its potential adverse effects on embryonic development have been scarcely studied, and it has not been assigned a pregnancy category by the FDA. Thus, to help in the process of risk-benefit decision making upon triclabendazole treatment during pregnancy, a better characterization of its risks during gestation is needed.The zebrafish embryo test, a preimplantation and a postimplantation rodent whole embryo culture were used to investigate the potential embryotoxicity/teratogenicity of triclabendazole and its first metabolite triclabendazole sulfoxide. Albendazole and albendazole sulfoxide were included as positive controls.Triclabendazole was between 10 and 250 times less potent than albendazole in inducing dysmorphogenic effects in zebrafish or postimplantation rodent embryos, respectively. However, during the preimplantation period, both compounds, triclabendazole and triclabendazole sulfoxide, induced a dose-dependent embryolethal effect after only 24 h of exposure in rodent embryos and zebrafish (lowest observed adverse effect concentrations = 10 μM.In humans, after ingestion of the recommended doses of triclabendazole to treat fascioliasis and paragonimiasis (10 mg/kg, the main compound found in plasma is triclabendazole sulfoxide (maximum concentration 38.6 μM, while triclabendazole concentrations are approximately 30 times lower (1.16 μM. From our results it can be concluded that triclabendazole, at concentrations of the same order of magnitude as the clinically relevant ones, does not entail teratogenic potential in vitro during the

  5. Synergistic extraction and separation of Am(III) and Ln(III) with HBMPPT-sulfoxide-HNO3-toluene system


    Some sulfoxides (petroleum sulfoxide -PSO, di-n-octyl sulfoxide -DOSO, etc.) were chosen as synergists to study the synergistic effect on the extraction re action with HBMPPT (4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione) for Am(III), and the synergistic separation for Am(III) and Ln(III). The synergistic extraction ability of PSO is greater than that of DOSO for Am(III). The synergistic complexes may be presented as Am. NO3.(BMPPT)2.HBMPPT.S2 (S indicates PSO or DOSO).

  6. Use of albendazole sulfoxide, albendazole sulfone, and combined solutions as scolicidal agents on hydatid cysts ( in vitro study)

    Gokhan Adas; Soykan Arikan; Ozgur Kemik; Ali Oner; Nilgun Sahip; Oguzhan Karatepe


    AIM: To establish which scolicidal agents are superior and more suitable for regular use.METHODS: Echinococcus granulosus protoscoleces were obtained from 25 patients with liver hydatid cysts. Various concentrations of albendazole sulfone,albendazole sulfoxide, and albendazole sulfone and albendazole sulfoxide mixed together in concentrations of 50 μg/mL, and H2O2 in a concentration of 4%, NaCl 20%, and 1.5% cetrimide-0.15% chlorhexidine (10% Savlon-Turkey) were used to determine the scolicidal effects. Albendazole (ABZ) derivatives and other scolicidal agents were applied to a minimum of 100 scoleces for 5 and 10 min. The degree of viability was calculated according to the number of living scolices per field from a total of 100 scolices observed under the microscope.RESULTS: After 5 min, ABZ sulfone was 97.3% effective, ABZ sulfoxide was 98.4% effective, and the combined solution was 98.6% effective. When sulfone, sulfoxide and the combined solutions were compared,the combined solution seemed more effective than sulfone. However, there was no difference when the combined solution was compared with sulfoxide. After 10 min, hypertonic salt water, sulfone, sulfoxide, and the combined solution compared to other solutions looked more effective and this was statistically significant on an advanced level. When sulfone,sulfoxide, and the combined solutions were compared with each other, the combined solution appeared more effective than sulfone. When the combined solution was compared with sulfoxide, there was no difference.CONCLUSION: Despite being active, ABZ metabolites did not provide a marked advantage over 20% hypertonic saline. According to these results, we think creating a newly improved and more active preparation is necessary for hydatid cyst treatment.

  7. Extraction of gold, palladium, and platinum from acidic media with cyclic sulfoxide derivative

    Songping Wu; Guobang Gu


    The extraction of gold (Ⅲ), palladium (Ⅱ), and platinum (Ⅳ) from the acidic media with the cyclic sulfoxide derivative of a-dodecyl-tetrahydrothiophene 1-oxide (dtmso) was investigated. Gold (Ⅲ), palladium (Ⅱ), and platinum (Ⅳ) could be separated from the acidic media with suitable sulfoxide concentration and acidity. The extraction reaction of gold (Ⅲ), palladium (Ⅱ) or platinum (Ⅳ) is exothermic when dtmso is used as an extracting reagent. The coordination number was studied by the slope method. The results indicate that, in high acidity, the dtmso coordination number for extracting gold (Ⅲ) or palladium (Ⅱ) is 3, and that for platinum (Ⅳ) is 2. UV and FT-IR spectra were used to analyze the structure of the complex. Gold (Ⅲ) is coordinated with the oxygen atom in S=O group in dtmso, and palladium (Ⅱ) or platinum (Ⅳ) is coordinated with the sulfur atom in S=O group in dtmso.


    Thiago Barth


    Full Text Available Albendazole (ABZ is an anthelmintic drug used for the treatment of infectious diseases in veterinary and human medicine. This drug is a prochiral drug that after administration, is rapidly oxidized in the pharmacologically active sulfoxide metabolite, which is also known as ricobendazole (ABZSOX. ABZSOX has a stereogenic center and possibly two enantiomers, (+-ABZSOX and (--ABZSOX. In the present work, we investigate the pH effect on the asymmetric stereoselective sulfoxidation of ABZ into ABZSOX by employing the fungi Nigrospora sphaerica, Papulaspora immera Hotson, and Mucor rouxii. The results show a possibility of obtaining the pure enantiomers of the ricobendazole drug using fungi as biocatalytic agents. The three fungi showed a high degree of enantioselectivity expressed by enantiomeric excess. In addition, M. rouxii can be used as an alternative to obtain the (+-ABZSOX enantiomer (ee 89.8%.

  9. Synthesis, Characterization and Fluorescence of Phenylcarboxymethyl Sulfoxide Complexes with Lanthanide Nitrates

    李文先; 张东凤


    Phenylcarboxymethyl Sulfoxide, PhSOCH2COOH(LH), complexes of six lanthanide nitrates: Ln2L2(NO3)4*2LH*nH2O(where Ln=La, Ce, Pr, Nd, Sm, Eu) were synthesized. Elemental analyses, molar conductivities, IR, 1HNMR and TG-DTA measurements were used to characterize the complexes. The results show that the ligand(L) is coordinated to metal ions through two oxygen atoms of the carboxyl group and one oxygen atom of the sulfoxide moieties. Neutral ligang (LH)is coordinated to two metal ions through two oxygen atoms of carboxyl group as an asymmetrical bridging bidentate. The fluorescence spectra of Eu3+ complex indicates that there is no inversion symmetry at the site of Eu3+ ion, but the emission intensity of fluorescence is quite good.The solubility of the complexes is very good in water.

  10. Sulfoxide-Directed Metal-Free ortho-Propargylation of Aromatics and Heteroaromatics.

    Eberhart, Andrew J; Shrives, Harry J; Álvarez, Estela; Carrër, Amandine; Zhang, Yuntong; Procter, David J


    A sulfoxide-directed, metal-free ortho-propargylation of aromatics and heteroaromatics exploits intermolecular delivery of a propargyl nucleophile to sulfur followed by an intramolecular relay to carbon. The operationally simple cross-coupling procedure is general, regiospecific with regard to the propargyl nucleophile, and shows complete selectivity for products of ortho-propargylation over allenylation. The use of secondary propargyl silanes allows metal-free ortho-coupling to form carbon-carbon bonds between aromatic and heteroaromatic rings and secondary propargylic centres. The 'safety-catch' nature of the sulfoxide directing group is illustrated in a selective, iterative double cross-coupling process. The products of propargylation are versatile intermediates and they have been readily converted into substituted benzothiophenes.

  11. Transition-Metal-Free Highly Efficient Aerobic Oxidation of Sulfides to Sulfoxides under Mild Conditions

    Hua Zhang


    Full Text Available A highly efficient transition-metal-free catalytic system Br2/NaNO2/H2O has been developed for a robust and economic acid-free aerobic oxidation of sulfides. It is noteworthy that the sulfide function reacts under mild conditions without over-oxidation to sulfone. The role of NaNO2as an efficient NO equivalent for the activation of molecular oxygen was identified. Under the optimal conditions, a broad range of sulfide substrates were converted into their corresponding sulfoxides in high yields by molecular oxygen. The present catalytic system utilizes cheap and readily available agents as the catalysts, exhibits high selectivity for sulfoxide products and releases only innocuous water as the by-products.

  12. Crystal structure of hexakis(dimethyl sulfoxide-κOmanganese(II diiodide

    Mathias Glatz


    Full Text Available The asymmetric unit of the title salt, [Mn(C2H6OS6]I2, consists of one MnII ion, six O-bound dimethyl sulfoxide (DMSO ligands and two I− counter-anions. The isolated complex cations have an octahedral configuration and are grouped in hexagonally arranged rows extending parallel to [100]. The two I− anions are located between the rows and are linked to the cations through two weak C—H...I interactions.

  13. Axially chiral imidodiphosphoric Acid catalyst for asymmetric sulfoxidation reaction: insights on asymmetric induction.

    Jindal, Garima; Sunoj, Raghavan B


    Insights into chiral induction for an asymmetric sulfoxidation reaction involving a single oxygen atom transfer are gained through analyzing the stereocontrolling transition states. The fitting of the substrate into the chiral cavity of a new class of imidodiphosphoric Brønsted acids, as well as weak CH⋅⋅⋅π and CH⋅⋅⋅O noncovalent interactions, are identified as responsible for the observed chiral induction.

  14. Composition and particle size of electrolytic copper powders prepared in water-containing dimethyl sulfoxide electrolytes

    Mamyrbekova, Aigul'; Abzhalov, B. S.; Mamyrbekova, Aizhan


    The possibility of the electroprecipitation of copper powder via the cathodic reduction of an electrolyte solution containing copper(II) nitrate trihydrate and dimethyl sulfoxide (DMSO) is shown. The effect electrolysis conditions (current density, concentration and temperature of electrolyte) have on the dimensional characteristics of copper powder is studied. The size and shape of the particles of the powders were determined by means of electron microscopy; the qualitative composition of the powders, with X-ray diffraction.

  15. Optimizing human hepatocyte models for metabolic phenotype and function: effects of treatment with dimethyl sulfoxide (DMSO).

    Nikolaou, Nikolaos; Green, Charlotte J; Gunn, Pippa J; Hodson, Leanne; Tomlinson, Jeremy W


    Primary human hepatocytes are considered to be the "gold standard" cellular model for studying hepatic fatty acid and glucose metabolism; however, they come with limitations. Although the HepG2 cell line retains many of the primary hepatocyte metabolic functions they have a malignant origin and low rates of triglyceride secretion. The aim of this study was to investigate whether dimethyl sulfoxide supplementation in the media of HepG2 cells would enhance metabolic functionality leading to the development of an improved in vitro cell model that closely recapitulates primary human hepatocyte metabolism. HepG2 cells were cultured in media containing 1% dimethyl sulfoxide for 2, 4, 7, 14, and 21 days. Gene expression, protein levels, intracellular triglyceride, and media concentrations of triglyceride, urea, and 3-hydroxybutyrate concentrations were measured. Dimethyl sulfoxide treatment altered the expression of genes involved in lipid (FAS, ACC1, ACC2, DGAT1, DGAT2, SCD) and glucose (PEPCK, G6Pase) metabolism as well as liver functionality (albumin, alpha-1-antitrypsin, AFP). mRNA changes were paralleled by alterations at the protein level. DMSO treatment decreased intracellular triglyceride content and lactate production and increased triglyceride and 3-hydroxybutyrate concentrations in the media in a time-dependent manner. We have demonstrated that the addition of 1% dimethyl sulfoxide to culture media changes the metabolic phenotype of HepG2 cells toward a more primary human hepatocyte phenotype. This will enhance the currently available in vitro model systems for the study of hepatocyte biology related to pathological processes that contribute to disease and their response to specific therapeutic interventions. © 2016 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The Physiological Society.

  16. Mutagenicity of the cysteine S-conjugate sulfoxides of trichloroethylene and tetrachloroethylene in the Ames test.

    Irving, Roy M; Elfarra, Adnan A


    The nephrotoxicity and nephrocarcinogenicity of trichloroethylene (TCE) and tetrachloroethylene (PCE) are believed to be mediated primarily through the cysteine S-conjugate β-lyase-dependent bioactivation of the corresponding cysteine S-conjugate metabolites S-(1,2-dichlorovinyl)-l-cysteine (DCVC) and S-(1,2,2-trichlorovinyl)-l-cysteine (TCVC), respectively. DCVC and TCVC have previously been demonstrated to be mutagenic by the Ames Salmonella mutagenicity assay, and reduction in mutagenicity was observed upon treatment with the β-lyase inhibitor aminooxyacetic acid (AOAA). Because DCVC and TCVC can also be bioactivated through sulfoxidation to yield the potent nephrotoxicants S-(1,2-dichlorovinyl)-l-cysteine sulfoxide (DCVCS) and S-(1,2,2-trichlorovinyl)-l-cysteine sulfoxide (TCVCS), respectively, the mutagenic potential of these two sulfoxides was investigated using the Ames Salmonella typhimurium TA100 mutagenicity assay. The results show both DCVCS and TCVCS were mutagenic, and TCVCS exhibited 3-fold higher mutagenicity than DCVCS. However, DCVCS and TCVCS mutagenic activity was approximately 700-fold and 30-fold lower than DCVC and TCVC, respectively. DCVC and DCVCS appeared to induce toxicity in TA100, as evidenced by increased microcolony formation and decreased mutant frequency above threshold concentrations. TCVC and TCVCS were not toxic in TA100. The toxic effects of DCVC limited the sensitivity of TA100 to DCVC mutagenic effects and rendered it difficult to investigate the effects of AOAA on DCVC mutagenic activity. Collectively, these results suggest that DCVCS and TCVCS exerted a definite but weak mutagenicity in the TA100 strain. Therefore, despite their potent nephrotoxicity, DCVCS and TCVCS are not likely to play a major role in DCVC or TCVC mutagenicity in this strain.

  17. Synthesis and Antiproliferative Activities of Benzimidazole-Based Sulfide and Sulfoxide Derivatives.

    Gaballah, Samir T; El-Nezhawy, Ahmed O H; Amer, Hassan; Ali, Mamdouh Moawad; Mahmoud, Abeer Essam El-Din; Hofinger-Horvath, Andreas


    The design, synthesis, and in vitro antiproliferative activity of a novel series of sulfide (4a-i) and sulfoxide (5a-h) derivatives of benzimidazole, in which different aromatic and heteroaromatic acetamides are linked to benzimidazole via sulfide (4a-i) and sulfoxide (5a-h) linker, are reported and the structure-activity relationship is discussed. The new derivatives were prepared by coupling 2-(mercaptomethyl)benzimidazole with 2-bromo-N-(substituted) acetamides in dry acetone in the presence of anhydrous potassium carbonate. With very few exceptions, all of the synthesized compounds showed varying antiprolific activities against HepG2, MCF-7, and A549 cell lines. Compound 5a was very similar in potency to doxorubicin as an anticancer drug, with IC50 values 4.1 ± 0.5, 4.1 ± 0.5, and 5.0 ± 0.6 µg/mL versus 4.2 ± 0.5, 4.9 ± 0.6, and 6.1 ± 0.6 µg/mL against HepG2, MCF-7, and A549 cell lines, respectively. In contrast, none of the compounds showed activity against human prostate PC3 cancer cells. Additionally, the sulfoxide derivatives were more potent than the corresponding sulfides.

  18. Transition metal-modified polyoxometalates supported on carbon as catalyst in 2-(methylthio)-benzothiazole sulfoxidation

    Romina A Frenzel; Gustavo P Romanelli; Mirta N Blanco; Luis R Piz


    Polyoxometalates with lacunary Keggin structure modified with transition metal ions [PW11O39M(H2O)]5−, where M = Ni2+, Co2+, Cu2+ or Zn2+, were synthesized and supported on activated carbon to obtain the PW11MC catalysts. Using FT-IR and DTA-TGA it was concluded that the [PW11O39M(H2O)]5− species are interacting with the functional groups of the support, and that thermal treatment leads to the loss of the coordinatively bonded water molecules without any noticeable anion degradation. The activity and selectivity of the catalysts in the sulfoxidation reaction of 2-(methylthio)-benzothiazole, an emerging environmental pollutant, were evaluated. The reaction was carried out in acetonitrile as solvent using H2O2 35% p/v as a clean oxidant. The conversion values decreased in the following order: PW11NiC > PW11CuC > PW11CoC > PW11ZnC, with selectivity to sulfoxide higher than 69%. The catalyst could be reused without appreciable loss of the catalytic activity at least three times. The materials were found to be efficient and recyclable catalysts for 2-(methylthio)-benzothiazole sulfoxidation in order to obtain a more biodegradable product than the corresponding substrate.

  19. Oxygen atom transfer reactions from Mimoun complexes to sulfides and sulfoxides. A bonding evolution theory analysis.

    González-Navarrete, Patricio; Sensato, Fabricio R; Andrés, Juan; Longo, Elson


    In this research, a comprehensive theoretical investigation has been conducted on oxygen atom transfer (OAT) reactions from Mimoun complexes to sulfides and sulfoxides. The joint use of the electron localization function (ELF) and Thom's catastrophe theory (CT) provides a powerful tool to analyze the evolution of chemical events along a reaction pathway. The progress of the reaction has been monitored by structural stability domains from ELF topology while the changes between them are controlled by turning points derived from CT which reveal that the reaction mechanism can be separated in several steps: first, a rupture of the peroxo O1-O2 bond, then a rearrangement of lone pairs of the sulfur atom occurs and subsequently the formation of S-O1 bond. The OAT process involving the oxidation of sulfides and sulfoxides is found to be an asynchronous process where O1-O2 bond breaking and S-O1 bond formation processes do not occur simultaneously. Nucleophilic/electrophilic characters of both dimethyl sulfide and dimethyl sulfoxide, respectively, are sufficiently described by our results, which hold the key to unprecedented insight into the mapping of electrons that compose the bonds while the bonds change.

  20. Corynebacterium diphtheriae methionine sulfoxide reductase a exploits a unique mycothiol redox relay mechanism.

    Tossounian, Maria-Armineh; Pedre, Brandán; Wahni, Khadija; Erdogan, Huriye; Vertommen, Didier; Van Molle, Inge; Messens, Joris


    Methionine sulfoxide reductases are conserved enzymes that reduce oxidized methionines in proteins and play a pivotal role in cellular redox signaling. We have unraveled the redox relay mechanisms of methionine sulfoxide reductase A of the pathogen Corynebacterium diphtheriae (Cd-MsrA) and shown that this enzyme is coupled to two independent redox relay pathways. Steady-state kinetics combined with mass spectrometry of Cd-MsrA mutants give a view of the essential cysteine residues for catalysis. Cd-MsrA combines a nucleophilic cysteine sulfenylation reaction with an intramolecular disulfide bond cascade linked to the thioredoxin pathway. Within this cascade, the oxidative equivalents are transferred to the surface of the protein while releasing the reduced substrate. Alternatively, MsrA catalyzes methionine sulfoxide reduction linked to the mycothiol/mycoredoxin-1 pathway. After the nucleophilic cysteine sulfenylation reaction, MsrA forms a mixed disulfide with mycothiol, which is transferred via a thiol disulfide relay mechanism to a second cysteine for reduction by mycoredoxin-1. With x-ray crystallography, we visualize two essential intermediates of the thioredoxin relay mechanism and a cacodylate molecule mimicking the substrate interactions in the active site. The interplay of both redox pathways in redox signaling regulation forms the basis for further research into the oxidative stress response of this pathogen.

  1. Experimental and theoretical proton affinities of methionine, methionine sulfoxide and their N- and C-terminal derivatives

    Lioe, Hadi; O'Hair, Richard A. J.; Gronert, Scott; Austin, Allen; Reid, Gavin E.


    The proton affinities of methionine, methionine sulfoxide and their derivatives (methionine methyl ester, methionine sulfoxide methyl ester, methionine methyl amide, methionine sulfoxide methyl amide, N-acetyl methionine, N-acetyl methionine sulfoxide, N-acetyl methionine methyl ester, N-acetyl methionine sulfoxide methyl ester, N-acetyl methionine methyl amide and N-acetyl methionine sulfoxide methyl amide) were experimentally determined using the kinetic method, in which proton bound dimers formed via electrospray ionization (ESI) were subjected to collision induced dissociation (CID) in a triple quadrupole mass spectrometer. In addition, theoretical calculations carried out at the MP2/6-311 + G(2d,p)//B3LYP/6-31 + G(d,p) level of theory to determine the global minima of the neutral and protonated species of all derivatives studied, were used to predict theoretical proton affinities. The density function theory calculations not only support the experimental proton affinities, but also provide structural insights into the types of hydrogen bonding that stabilize the neutral and protonated methionine or methionine sulfoxide derivatives. Comparison of the proton affinities of the various methionine and methionine sulfoxide derivatives reveals that: (i) oxidation of methionine derivatives to methionine sulfoxide derivatives results in an increase in proton affinity due to higher intrinsic proton affinity and an increase in the ring size formed through charge complexation of the sulfoxide group, which allows more efficient hydrogen bonding compared to the sulfide group; (ii) C-terminal modification by methyl esterification or methyl amidation increases the proton affinity in the order of methyl amide > methyl ester > carboxylic acid due to improved charge stabilization; (iii) N-terminal modification by N-acetylation decreases proton affinity of the derivatives due to lower intrinsic proton affinity of the N-acetyl group as well as due to stabilization of the attached

  2. Kinetics and thermodynamics of oxidation mediated reaction in L-cysteine and its methyl and ethyl esters in dimethyl sulfoxide-d6 by NMR spectroscopy

    Dougherty, Ryan J.; Singh, Jaideep; Krishnan, V. V.


    L-Cysteine (L-Cys), L-Cysteine methyl ester (L-CysME) or L-Cysteine ethyl ester (L-CysEE), when dissolved in dimethyl sulfoxide, undergoes an oxidation process. This process is slow enough and leads to nuclear magnetic resonance (NMR) spectral changes that could be monitored in real time. The oxidation mediated transition is modeled as a pseudo-first order kinetics and the thermodynamic parameters are estimated using the Eyring's formulation. L-Cysteine and their esters are often used as biological models due to the remarkable thiol group that can be found in different oxidation states. This oxidation mediated transition is due to the combination of thiol oxidation to a disulfide followed by solvent-induced effects may be relevant in designing cysteine-based molecular models.

  3. Methionine sulfoxide reductase A: Structure, function and role in ocular pathology

    Parameswaran; G; Sreekumar; David; R; Hinton; Ram; Kannan


    Methionine is a highly susceptible amino acid that can be oxidized to S and R diastereomeric forms of methionine sulfoxide by many of the reactive oxygen species generated in biological systems. Methionine sulfoxide reductases (Msrs) are thioredoxin-linked enzymes involved in the enzymatic conversion of methionine sulfoxide to methionine. Although MsrA and MsrB have the same function of methionine reduction, they differ in substrate specifi city, active site composition, subcellular localization, and evolution. MsrA has been localized in different ocular regions and is abundantly expressed in the retina and in retinal pigment epithelial (RPE) cells. MsrA protects cells from oxidative stress. Overexpression of MsrA increases resistance to cell death, while silencing or knocking down MsrA decreases cell survival; events that are mediated by mitochondria. MsrA participates in protein-protein interaction with several other cellular proteins. The interaction of MsrAwith α-crystallins is of utmost importance given the known functions of the latter in protein folding, neuroprotection, and cell survival. Oxidation of methionine residues in α-crystallins results in loss of chaperone function and possibly its antiapoptotic properties. Recent work from our laboratory has shown that MsrA is co-localized with αA and αB crystallins in the retinal samples of patients with age-related macular degen- eration. We have also found that chemically induced hypoxia regulates the expression of MsrA and MsrB2 in human RPE cells. Thus, MsrA is a critical enzyme that participates in cell and tissue protection, and its interaction with other proteins/growth factors may provide a target for therapeutic strategies to prevent degenerative diseases.

  4. Formation of methionine sulfoxide during glycoxidation and lipoxidation of ribonuclease A.

    Brock, Jonathan W C; Ames, Jennifer M; Thorpe, Suzanne R; Baynes, John W


    Chemical modification of proteins by reactive oxygen species affects protein structure, function and turnover during aging and chronic disease. Some of this damage is direct, for example by oxidation of amino acids in protein by peroxide or other reactive oxygen species, but autoxidation of ambient carbohydrates and lipids amplifies both the oxidative and chemical damage to protein and leads to formation of advanced glycoxidation and lipoxidation end-products (AGE/ALEs). In previous work, we have observed the oxidation of methionine during glycoxidation and lipoxidation reactions, and in the present work we set out to determine if methionine sulfoxide (MetSO) in protein was a more sensitive indicator of glycoxidative and lipoxidative damage than AGE/ALEs. We also investigated the sites of methionine oxidation in a model protein, ribonuclease A (RNase), in order to determine whether analysis of the site specificity of methionine oxidation in proteins could be used to indicate the source of the oxidative damage, i.e. carbohydrate or lipid. We describe here the development of an LC/MS/MS for quantification of methionine oxidation at specific sites in RNase during glycoxidation or lipoxidation by glucose or arachidonate, respectively. Glycoxidized and lipoxidized RNase were analyzed by tryptic digestion, followed by reversed phase HPLC and mass spectrometric analysis to quantify methionine and methionine sulfoxide containing peptides. We observed that: (1) compared to AGE/ALEs, methionine sulfoxide was a more sensitive biomarker of glycoxidative or lipoxidative damage to proteins; (2) regardless of oxidizable substrate, the relative rate of oxidation of methionine residues in RNase was Met29>Met30>Met13, with Met79 being resistant to oxidation; and (3) arachidonate produced a significantly greater yield of MetSO, compared to glucose. The methods developed here should be useful for assessing a protein's overall exposure to oxidative stress from a variety of sources in

  5. Sequential picosecond isomerizations in a photochromic ruthenium sulfoxide complex triggered by pump-repump-probe spectroscopy.

    King, Albert W; Jin, Yuhuan; Engle, James T; Ziegler, Christopher J; Rack, Jeffrey J


    The complex [Ru(bpy)(2)(bpSO)](PF(6))(2), where bpy is 2,2'-bipydine and bpSO is 1,2-bis(phenylsulfinyl)ethane, exhibits three distinct isomers which are accessible upon metal-to-ligand charge-transfer (MLCT) irradiation. This complex and its parent, [Ru(bpy)(2)(bpte)](PF(6))(2), where bpte is 1,2-bis(phenylthio)ethane, have been synthesized and characterized by UV-visible spectroscopy, NMR, X-ray crystallography, and femtosecond transient absorption spectroscopy. A novel method of 2-color Pump-Repump-Probe spectroscopy has been employed to investigate all three isomers of the bis-sulfoxide complex. This method allows for observation of the isomerization dynamics of sequential isomerizations of each sulfoxide from MLCT irradiation of the S,S-bonded complex to ultimately form the O,O-bonded metastable complex. One-dimensional (1-D) and two-dimensional (2-D) (COSY, NOESY, and TOCSY) (1)H NMR data show the thioether and ground state S,S-bonded sulfoxide complexes to be rigorously C(2) symmetric and are consistent with the crystal structures. Transient absorption spectroscopy reveals that the S,S to S,O isomerization occurs with an observed time constant of 56.8 (±7.4) ps. The S,O to O,O isomerization time constant was found to be 59 (±4) ps by pump-repump-probe spectroscopy. The composite S,S- to O,O-isomer quantum yield is 0.42.

  6. Three-body dissociations: The photodissociation of dimethyl sulfoxide at 193 nm

    Blank, D.A.; North, S.W.; Stranges, D. [Lawrence Berkeley National Lab., CA (United States)] [and others


    When a molecule with two equivalent chemical bonds is excited above the threshold for dissociation of both bonds, how the rupture of the two bonds is temporally coupled becomes a salient question. Following absorption at 193 nm dimethyl sulfoxide (CH{sub 3}SOCH{sub 3}) contains enough energy to rupture both C-S bonds. This can happen in a stepwise (reaction 1) or concerted (reaction 2) fashion where the authors use rotation of the SOCH{sub 3} intermediate prior to dissociation to define a stepwise dissociation: (1) CH{sub 3}SOCH{sub 3} {r_arrow} 2CH{sub 3} + SO; (2a) CH{sub 3}SOCH{sub 3} {r_arrow} CH{sub 3} + SOCH{sub 3}; and (2b) SOCH{sub 3} {r_arrow} SO + CH{sub 3}. Recently, the dissociation of dimethyl sulfoxide following absorption at 193 nm was suggested to involve simultaneous cleavage of both C-S bonds on an excited electronic surface. This conclusion was inferred from laser induced fluorescence (LIF) and resonant multiphoton ionization (2+1 REMPI) measurements of the internal energy content in the CH{sub 3} and SO photoproducts and a near unity quantum yield measured for SO. Since this type of concerted three body dissociation is very interesting and a rather rare event in photodissociation dynamics, the authors chose to investigate this system using the technique of photofragment translational spectroscopy at beamline The soft photoionization provided by the VUV undulator radiation allowed the authors to probe the SOCH{sub 3} intermediate which had not been previously observed and provided good evidence that the dissociation of dimethyl sulfoxide primarily proceeds via a two step dissociation, reaction 2.

  7. Synthesis and Nrf2 Activating Ability of Thiourea and Vinyl Sulfoxide Derivatives

    Shim, Young Sun; Hwang, Hyun Sook; Nam, Ghilsoo; Choi, Kyung Il [Korea Institute of Science and Technology, Seoul (Korea, Republic of)


    Thiourea and vinyl sulfoxide derivatives were designed based on the structures of sulforaphene and gallic acid, prepared and tested for HO-1 inducing activity as a measure of Nrf2 activation, and inhibitory effect on NO production as a measure of anti-inflammatory activity. Both series of compounds showed moderate activity on HO-1 induction, and no inhibitory effect on NO production. Interestingly the thiourea compound 6d showed better HO-1 induction (71% SFN) than the corresponding isothiocyanate compound 6a (55% SFN). Overall, it seemed that more efficient electrophile is needed to get more effective Nrf2 activator.

  8. Crystal structure of hexa-kis-(dimethyl sulfoxide-κO)manganese(II) diiodide.

    Glatz, Mathias; Schroffenegger, Martina; Weil, Matthias; Kirchner, Karl


    The asymmetric unit of the title salt, [Mn(C2H6OS)6]I2, consists of one Mn(II) ion, six O-bound dimethyl sulfoxide (DMSO) ligands and two I(-) counter-anions. The isolated complex cations have an octa-hedral configuration and are grouped in hexa-gonally arranged rows extending parallel to [100]. The two I(-) anions are located between the rows and are linked to the cations through two weak C-H⋯I inter-actions.

  9. Solvation of LiBF4 ions in dimethyl sulfoxide solutions according to Raman spectroscopy data

    Gafurov, M. M.; Ataev, M. B.; Rabadanov, K. Sh.; Gorobets, M. I.; Tret'yakov, D. O.; Kirillov, S. A.; Kubataev, Z. Yu.


    Ionic equilibria in the LiBF4-dimethyl sulfoxide (DMSO) system were studied by Raman spectroscopy at 50°C at salt concentrations of 0.05-0.25 mole fractions. The spectral signals of hydrogen bonds between the DMSO molecules and the fluoroborate ions were found. The concentrations of the monomer and dimer DMSO molecules and DMSO molecules in the solvation sphere of the lithium cation; free solvent molecules and those in the solvation sphere of the fluoroborate ion; free anions, ion pairs separated by the solvent, and contact ion pairs were determined.

  10. cis-Dichlorido(dimethyl sulfoxide-κS(N,N,N′,N′-tetramethylguanidine-κN′′platinum(II

    Ivan I. Eliseev


    Full Text Available In the title compound, cis-[PtCl2(C5H13N3(C2H6OS], the four-coordinate PtII atom is bonded to one N atom of the N,N,N′,N′-tetramethylguanidine ligand, one dimethyl sulfoxide S atom and two chloride ligands, forming a cis-square-planar geometry. The bond lengths and angles of the N—Pt—Cl functionality are typical for imine dichloridoplatinum(II complexes. The H atom of the imino group is oriented towards the O atom of the sulfoxide group of a neighboring molecule and forms an N—H...O hydrogen bond.

  11. Methionine sulfoxide reductase A expression is regulated by the DAF-16/FOXO pathway in Caenorhabditis elegans.

    Minniti, Alicia N; Cataldo, Romina; Trigo, Carla; Vasquez, Luis; Mujica, Patricio; Leighton, Federico; Inestrosa, Nibaldo C; Aldunate, Rebeca


    The methionine sulfoxide reductase system has been implicated in aging and protection against oxidative stress. This conserved system reverses the oxidation of methionine residues within proteins. We analyzed one of the components of this system, the methionine sulfoxide reductase A gene, in Caenorhabditis elegans. We found that the msra-1 gene is expressed in most tissues, particularly in the intestine and the nervous system. Worms carrying a deletion of the msra-1 gene are more sensitive to oxidative stress, show chemotaxis and locomotory defects, and a 30% decrease in median survival. We established that msra-1 expression decreases during aging and is regulated by the DAF-16/FOXO3a transcription factor. The absence of this enzyme decreases median survival and affects oxidative stress resistance of long lived daf-2 worms. A similar effect of MSRA-1 absence in wild-type and daf-2 (where most antioxidant enzymes are activated) backgrounds, suggests that the lack of this member of the methionine repair system cannot be compensated by the general antioxidant response. Moreover, FOXO3a directly activates the human MsrA promoter in a cell culture system, implying that this could be a conserved mechanism of MsrA regulation. Our results suggest that repair of oxidative damage in proteins influences the rate at which tissues age. This repair mechanism, rather than the general decreased of radical oxygen species levels, could be one of the main determinants of organisms' lifespan.

  12. Stimulation of differentiated functions in human melanoma cells by tumor-promoting agents and dimethyl sulfoxide

    Huberman, E.; Heckman, C.; Langenbach, R.


    Treatment of cultured human HO melanoma cells with the mouse skin tumor promoter phorbol-12-myristate-13-acetate (PMA) at 5 x 10/sup -10/ to 5 x 10/sup -7/ M resulted in a dose-related inhibition of growth and a stimulation of differentiated functions. These included melanin synthesis and formation of dendrite-like structues. Higher doses of phorbol dibutyrate, a less potent tumor promoter, were required to produce an effect comparable to that of PMA for dendrite induction. Phorbol and two other phorbal esters, which lack tumor-promoting activity, were either inactive or elicited a poor response. In addition to morphological changes, treatment with PMA altered glucosamine incorporation into membrane gangliosides. After PMA treatment, glucosamine incorporation increased 8- to 10 fold in the G/sub m3/ ganglioside and decreased 2-fold in the G/sub m1/ ganglioside, as compared to phorbol or untreated control. Inhibition of cell growth and stimulation of melanin synthesis were also observed after treatment of the HO cells with dimethyl sulfoxide. Unlike the tumor-promoting agents, dimethyl sulfoxide did not induce the formation of dendrite-like structures in the cells. These findings indicate that HO melanoma cells can be stimulated into terminally differentiated cells after treatment with tumor-promoting agents such as phorbol diesters.

  13. Evidence for the dimerization-mediated catalysis of methionine sulfoxide reductase A from Clostridium oremlandii.

    Lee, Eun Hye; Lee, Kitaik; Kwak, Geun-Hee; Park, Yeon Seung; Lee, Kong-Joo; Hwang, Kwang Yeon; Kim, Hwa-Young


    Clostridium oremlandii MsrA (CoMsrA) is a natively selenocysteine-containing methionine-S-sulfoxide reductase and classified into a 1-Cys type MsrA. CoMsrA exists as a monomer in solution. Herein, we report evidence that CoMsrA can undergo homodimerization during catalysis. The monomeric CoMsrA dimerizes in the presence of its substrate methionine sulfoxide via an intermolecular disulfide bond between catalytic Cys16 residues. The dimeric CoMsrA is resolved by the reductant glutaredoxin, suggesting the relevance of dimerization in catalysis. The dimerization reaction occurs in a concentration- and time-dependent manner. In addition, the occurrence of homodimer formation in the native selenoprotein CoMsrA is confirmed. We also determine the crystal structure of the dimeric CoMsrA, having the dimer interface around the two catalytic Cys16 residues. A central cone-shaped hole is present in the surface model of dimeric structure, and the two Cys16 residues constitute the base of the hole. Collectively, our biochemical and structural analyses suggest a novel dimerization-mediated mechanism for CoMsrA catalysis that is additionally involved in CoMsrA regeneration by glutaredoxin.

  14. Vibrio cholerae ensures function of host proteins required for virulence through consumption of luminal methionine sulfoxide

    Vanhove, Audrey S.; Hang, Saiyu; Wong, Adam CN; Asara, John M.


    Vibrio cholerae is a diarrheal pathogen that induces accumulation of lipid droplets in enterocytes, leading to lethal infection of the model host Drosophila melanogaster. Through untargeted lipidomics, we provide evidence that this process is the product of a host phospholipid degradation cascade that induces lipid droplet coalescence in enterocytes. This infection-induced cascade is inhibited by mutation of the V. cholerae glycine cleavage system due to intestinal accumulation of methionine sulfoxide (MetO), and both dietary supplementation with MetO and enterocyte knock-down of host methionine sulfoxide reductase A (MsrA) yield increased resistance to infection. MsrA converts both free and protein-associated MetO to methionine. These findings support a model in which dietary MetO competitively inhibits repair of host proteins by MsrA. Bacterial virulence strategies depend on functional host proteins. We propose a novel virulence paradigm in which an intestinal pathogen ensures the repair of host proteins essential for pathogenesis through consumption of dietary MetO. PMID:28586382

  15. Ultrafast spectroscopy and structural characterization of a photochromic isomerizing ruthenium bis-sulfoxide complex.

    King, Albert W; Malizia, Jason P; Engle, James T; Ziegler, Christopher J; Rack, Jeffrey J


    Irradiation of [Ru(bpy)2(bpSOp)](PF6)2 (where bpy is 2,2'-bipyridine and bpSOp is 1,3-bis(phenylsulfinyl)propane) results in the formation of two new isomers, namely the S,O- and O,O-bonded species. The crystal structure of the bis-thioether and bis-sulfoxide complexes are reported. NMR spectroscopy of the bis-thioether complex in solution is consistent with the molecular structure determined by diffraction methods. Further, NMR spectroscopy of the bis-sulfoxide complex reveals two conformers in solution, one that is consistent with the solid state structure and a second conformer showing distortion in the aliphatic portion of the chelate ring. Time-resolved visible absorption spectroscopy reveals isomerization time constants of 91 ps in dichloroethane (DCE) and 229 ps in propylene carbonate (PC). Aggregate isomerization quantum yields of 0.57 and 0.42 have been determined in DCE and in PC, respectively. The kinetics of the thermal reversion from the O,O- to S,O-bonded isomer are strongly solvent dependent, occurring with rates of 2.41 × 10(-3) and 4.39 × 10(-5) s(-1) in DCE, and 4.68 × 10(-4) and 9.79 × 10(-6) s(-1) in PC. The two kinetic components are assigned to the two isomers identified in solution.

  16. Should the standard dimethyl sulfoxide concentration be reduced? Results of a European Group for Blood and Marrow Transplantation prospective noninterventional study on usage and side effects of dimethyl sulfoxide

    Morris, Curly; de Wreede, Liesbeth; Scholten, Marijke; Brand, Ronald; van Biezen, Anja; Sureda, Anna; Dickmeiss, Ebbe; Trneny, Marek; Apperley, Jane; Chiusolo, Patrizia; van Imhoff, Gustaaf W.; Lenhoff, Stig; Martinelli, Giovanni; Hentrich, Marcus; Pabst, Thomas; Onida, Francesco; Quinn, Michael; Kroger, Nicolaus; de Witte, Theo; Ruutu, Tapani


    BackgroundDimethyl sulfoxide (DMSO) is essential for the preservation of liquid nitrogen-frozen stem cells, but is associated with toxicity in the transplant recipient. Study Design and MethodsIn this prospective noninterventional study, we describe the use of DMSO in 64 European Blood and Marrow Tr

  17. Should the standard dimethyl sulfoxide concentration be reduced? Results of a European Group for Blood and Marrow Transplantation prospective noninterventional study on usage and side effects of dimethyl sulfoxide

    Morris, C.; Wreede, L. de; Scholten, M.; Brand, R.; Biezen, A. van; Sureda, A.; Dickmeiss, E.; Trneny, M.; Apperley, J.; Chiusolo, P.; Imhoff, G.W. van; Lenhoff, S.; Martinelli, G.; Hentrich, M.; Pabst, T.; Onida, F.; Quinn, M.; Kroger, N.; Witte, T.J. de; Ruutu, T.; Chronic, M.; the, E. Lymphoma Workin


    BACKGROUND: Dimethyl sulfoxide (DMSO) is essential for the preservation of liquid nitrogen-frozen stem cells, but is associated with toxicity in the transplant recipient. STUDY DESIGN AND METHODS: In this prospective noninterventional study, we describe the use of DMSO in 64 European Blood and Marro

  18. A Method for the Quantitation of Trace Levels of Dimethyl Sulfoxide in Urine by High Performance Liquid Chromatography


    HIGH PERFORMANCE LIQUID CHROMATOGRAPHY by...for the sample cleanup and concentration, followed by separation by reversed phase high performance liquid chromatography . EXPERIMENTAL Materials...DIMETHYL SULFOXIDE IN URINE BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY 4. AUTHORS (Last name, first name, middle initial. If military, show rank, e.g.

  19. Determination of Dimethyl Sulfoxide (DMSO), Ethanol (ETOH), Formamide (F) and Glycerol/Formal (GF) by High Performance Liquid Chromatography (HPLC)


    HIGH PERFORMANCE LIQUID CHROMATOGRAPHY (HPLC...Classification) (U) Determination of Dimethyl Sulfoxide (DMSO), Ethanol, (ETOH), Formamide (F), and Glycerol/ Formal (GF) by High Performance Liquid Chromatography (HPLC...and 5). High performance liquid chromatography (HPLC) was the analytical method of choice for analyzing DMSO, ethanol, formamide and

  20. Diastereoselective Addition of α-Metalated Sulfoxides to Imines Revisited: Mechanism, Computational Studies, and the Effect of External Chiral Ligands

    Pedersen, Brian; Rein, Tobias; Søtofte, Inger;


    Some new results on asymmetric synthesis via the addition of a-metalated methyl tolyl sulfoxides to imines are presented. Good diastereoselectivity (up to > 98% d.e. for product 3g) can be obtained under conditions of kinetic control (short reaction time, low temperature). The transition state (a...

  1. Modification of pineapple peel fiber as metal ion adsorbent through reaction with succinic anhydride in pyridine and dimethyl sulfoxide solvents.

    Hu, Xiuyi; Zhao, Mouming; Huang, Huihua


    Reactions between saponified pineapple peel fiber (SPPF) and succinic anhydride were performed in refluxed pyridine and dimethyl sulfoxide to obtain modified pineapple peel fiber in pyridine (MPPF-PY) and modified pineapple peel fiber in dimethyl sulfoxide at room temperature (MPPF-DMRT) and at 70 degrees C (MPPF-DM70) as novel metal ionic adsorbents. The modified pineapple peel fibers were characterized by Fourier transform infrared (FTIR) and X-ray diffraction (XRD). The MPPF-PY, MPPF-DMRT, and MPPF-DM70 showed higher Cu2+, Cd2+, and Pb2+ adsorption capacity than raw pineapple peel fiber (RPPF) and SPPF. Dimethyl sulfoxide favored introduction of a carboxylic function group into pineapple peel fiber compared with pyridine. The elevated reaction temperature of dimethyl sulfoxide could increase the adsorption capacity of the modified pineapple fiber. Optimum pH values for Cu2+, Cd2+, and Pb2+ removal by MPPF-DM70 were pH 5.5, 7.5, and 5.5, respectively. The Cu2+, Cd2+, and Pb2+ adsorptions by MPPF-DM70 followed the pseudo second-order kinetics model and Langmuir model.

  2. A New Look at the Stability of Dimethyl Sulfoxide and Acetonitrile in Li-O2 Batteries

    Younesi, Reza; Norby, Poul; Vegge, Tejs


    Dimethyl sulfoxide (DMSO) and acetonitrile (MeCN) have recently been highlighted as promising electrolyte solvents for Li-O2 batteries. Possible reactions between these two solvents and Li2O2 are here discussed using X-ray photoelectron spectroscopy to analyze surface of the Li2O2 powder after...

  3. Rhodium-catalyzed imination of sulfoxides and sulfides: efficient preparation of N-unsubstituted sulfoximines and sulfilimines.

    Okamura, Hiroaki; Bolm, Carsten


    The Rh(II)-catalyzed imination of sulfoxides and sulfides using [Rh(2)(OAc)(4)] as a catalyst and trifluoroacetamide or sulfonylamides in combination with iodobenzene diacetate and magnesium oxide affords sulfoximines and sulfilimines, respectively, in a stereospecific manner. [reaction: see text

  4. Dopamine D(2) receptor function is compromised in the brain of the methionine sulfoxide reductase A knockout mouse.

    Oien, Derek B; Ortiz, Andrea N; Rittel, Alexander G; Dobrowsky, Rick T; Johnson, Michael A; Levant, Beth; Fowler, Stephen C; Moskovitz, Jackob


    Previous research suggests that brain oxidative stress and altered rodent locomotor behavior are linked. We observed bio-behavioral changes in methionine sulfoxide reductase A knockout mice associated with abnormal dopamine signaling. Compromised ability of these knockout mice to reduce methionine sulfoxide enhances accumulation of sulfoxides in proteins. We examined the dopamine D(2)-receptor function and expression, which has an atypical arrangement and quantity of methionine residues. Indeed, protein expression levels of dopamine D(2)-receptor were higher in knockout mice compared with wild-type. However, the binding of dopamine D(2)-receptor agonist was compromised in the same fractions of knockout mice. Coupling efficiency of dopamine D(2)-receptors to G-proteins was also significantly reduced in knockout mice, supporting the compromised agonist binding. Furthermore, pre-synaptic dopamine release in knockout striatal sections was less responsive than control sections to dopamine D(2)-receptor ligands. Behaviorally, the locomotor activity of knockout mice was less responsive to the inhibitory effect of quinpirole than wild-type mice. Involvement of specific methionine residue oxidation in the dopamine D(2)-receptor third intracellular loop is suggested by in vitro studies. We conclude that ablation of methionine sulfoxide reductase can affect dopamine signaling through altering dopamine D(2)-receptor physiology and may be related to symptoms associated with neurological disorders and diseases.

  5. Dopamine D2 receptor function is compromised in the brain of the methionine sulfoxide reductase A knockout mouse

    Oien, Derek B.; Ortiz, Andrea N.; Rittel, Alexander G.; Dobrowsky, Rick T.; Johnson, Michael A.; Levant, Beth; Fowler, Stephen C.; Moskovitz, Jackob


    Previous research suggests that brain oxidative stress and altered rodent locomotor behavior are linked. We observed bio-behavioral changes in methionine sulfoxide reductase A knockout mice associated with abnormal dopamine signaling. Compromised ability of these knockout mice to reduce methionine sulfoxide enhances accumulation of sulfoxides in proteins. We examined the dopamine D2-receptor function and expression, which has an atypical arrangement and quantity of methionine residues. Indeed, protein expression levels of dopamine D2-receptor were higher in knockout mice compared with wild-type. However, the binding of dopamine D2-receptor agonist was compromised in the same fractions of knockout mice. Coupling efficiency of dopamine D2-receptors to G-proteins was also significantly reduced in knockout mice, supporting the compromised agonist binding. Furthermore, pre-synaptic dopamine release in knockout striatal sections was less responsive than control sections to dopamine D2-receptor ligands. Behaviorally, the locomotor activity of knockout mice was less responsive to the inhibitory effect of quinpirole than wild-type mice. Involvement of specific methionine residue oxidation in the dopamine D2-receptor third intracellular loop is suggested by in vitro studies. We conclude that ablation of methionine sulfoxide reductase can affect dopamine signaling through altering dopamine D2-receptor physiology and may be related to symptoms associated with neurological disorders and diseases. PMID:20374422

  6. Methionine Residues in Exoproteins and Their Recycling by Methionine Sulfoxide Reductase AB Serve as an Antioxidant Strategy in Bacillus cereus

    Jean-Paul Madeira


    Full Text Available During aerobic respiratory growth, Bacillus cereus is exposed to continuously reactive oxidant, produced by partially reduced forms of molecular oxygen, known as reactive oxygen species (ROS. The sulfur-containing amino acid, methionine (Met, is particularly susceptible to ROS. The major oxidation products, methionine sulfoxides, can be readily repaired by methionine sulfoxide reductases, which reduce methionine sulfoxides [Met(O] back to methionine. Here, we show that methionine sulfoxide reductase AB (MsrAB regulates the Met(O content of both the cellular proteome and exoproteome of B. cereus in a growth phase-dependent manner. Disruption of msrAB leads to metabolism changes resulting in enhanced export of Met(O proteins at the late exponential growth phase and enhanced degradation of exoproteins. This suggests that B. cereus can modulate its capacity and specificity for protein export/secretion through the growth phase-dependent expression of msrAB. Our results also show that cytoplasmic MsrAB recycles Met residues in enterotoxins, which are major virulence factors in B. cereus.

  7. Density, viscosity and refractive index of the dimethyl sulfoxide + o-xylene system



    Full Text Available This work reports the experimental results of the densities, viscosities and refractive indices between 298.15 and 323.15 K of the dimethyl sulfoxide + o-xylene system over the entire composition range of the mixtures. The excess molar volumes (VE, viscosity deviations (Δn, excess Gibbs energy of activation of viscous flow (G*E and deviations in the refraction (ΔR were calculated from the experimental data; all the computed quantities were fitted to the Redlich–Kister equation. The system exhibits moderate negative values for the investigated excess properties. The resulting excess functions were interpreted in structural and interactional terms. From the experimental data, the thermodynamic functions of the activation of viscous flow were estimated. The viscosity data were correlated with several semi-empirical equations. The two-parameter McAllister equation can give very good results.

  8. Electrical conductivity of solutions of copper(II) nitrate crystalohydrate in dimethyl sulfoxide

    Mamyrbekova, Aigul K.; Mamitova, A. D.; Mamyrbekova, Aizhan K.


    Conductometry is used to investigate the electric conductivity of Cu(NO3)2 ṡ 3H2O solutions in dimethyl sulfoxide in the 0.01-2.82 M range of concentrations and at temperatures of 288-318 K. The limiting molar conductivity of the electrolyte and the mobility of Cu2+ and NO 3 - ions, the effective coefficients of diffusion of copper(II) ions and nitrate ions, and the degree and constant of electrolytic dissociation are calculated for different temperatures from the experimental results. It is established that solutions containing 0.1-0.6 M copper nitrate trihydrate in DMSO having low viscosity and high electrical conductivity can be used in electrochemical deposition.

  9. A study on the composition and structure of cyclic sulfoxide derivative palladium(Ⅱ) complex

    WU Songping; GU Guobang; MENG Shuyuan


    The composition and structure of cyclic sulfoxide derivative Pd(Ⅱ) complex were investigated. The coordinated number was studied with slope method. The coordination number is 2 in lower acidity, but it is 3 in higher acidity. Four methods, UV (ultraviolet) spectra, FrIR (Fourier transform infrared) spectra, 1H-NMR (nuclear magnetic resonance)spectra, and 13C-NMR spectra, were used to determine the coordinated atom in complex. Pd is coordinated with O and S atom in S=O group in lower acidity media. The conversion of coordination bond appears with an increasing time. Pd is coordinated with S atom in S=O group in higher acidity media, and inter-ligand-transfer reaction occurs.

  10. [Effective dimethyl sulfoxide (DMSO) occlusive dressing technique for amyloidosis of the urinary bladder].

    Hasegawa, Yoshihiro; Kanda, Hideki; Miki, Manabu; Masui, Satoru; Yoshio, Yuko; Yamada, Yasushi; Soga, Norihito; Arima, Kiminobu; Sugimura, Yoshiki


    A 48-year-old married woman complaining of macroscopic hematuria and cystitis symptom was admitted to our institute. Flexible cystoscopy revealed many yellowish, nodular masses at the paries posterior of the urinary bladder, and cold-punch biopsy proved it to be amyloidosis. Serum amyloid protein A (SAA) was high, and suggested systemic amyloidosis. Renal biopsy and colon fiberscopy did not reveal any abnormalities. We therefore diagnosed a primary localized amyloidosis of the urinary bladder. Transurethral resection and dimethyl sulfoxide (DMSO) infusion therapy are used to treat amyloidosis of the urinary bladder. However there is no definite cure for amyloidosis of the urinary bladder. Therefore we selected DMSO occlusive dressing technique therapy. After 5 years of therapy, there was no evidence of a recurrence of amyloidosis.

  11. Changing electrical properties of PEDOT:PSS by incorporating with dimethyl sulfoxide

    Lin, Yow-Jon; Lee, Jhe-You; Chen, Shang-Min


    The effect of incorporation of dimethyl sulfoxide (DMSO) into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) on the electrical conductivity is investigated. It is shown that the values of the carrier mobility and the carrier density increase significantly for PEDOT:PSS films with DMSO addition. The high carrier mobility of PEDOT:PSS samples with the addition of DMSO is attributed to a combined effect of the modification of the electron-phonon coupling and a change in the value of the PSS-to-PEDOT ratio. The high carrier density of PEDOT:PSS samples with DMSO addition is attributed to a high affinity of DMSO for water.

  12. On the Additions of Lithium Methyl p-Tolyl Sulfoxide to N-(PMPArylaldimines

    Matteo Zanda


    Full Text Available The results presented in this paper confirm that the stereochemical outcome of the reversible additions of lithium (R-methyl p-tolyl sulfoxide to N-arylidene-p-anisidines (NPMP imines depends on: (a the reaction conditions used and (b the electronic properties of the arylidene moiety on the starting imine. In particular, we show that under kinetic control (-70 °C the additions involving electron-rich N-arylidene groups occur with very high stereocontrol in favor of the (2S,RS-diastereomers, whereas an electron-deficient group favors the opposite stereochemical outcome. Based on the observations above, a mechanistic hypothesis is proposed.

  13. Crystallisation of α-lactose monohydrate from dimethyl sulfoxide (DMSO) solutions: influence of β-lactose

    Dincer, T. D.; Parkinson, G. M.; Rohl, A. L.; Ogden, M. I.


    In this study, the dimethyl sulfoxide (DMSO)-lactose system has been used to study the effect of β-lactose on the morphology of α-lactose monohydrate crystals. DMSO was used as the solvent as it greatly reduces the rate of mutarotation of α-lactose to β-lactose. It is shown that as the β-content of the solution increases, the crystal shape starts increasing in the a and b directions, whereas the major growth occurs in the c direction at low levels of β-lactose. The morphology of the α-lactose monohydrate crystal calculated by molecular modelling is in good agreement with that of the crystals grown in the presence of low β-lactose concentrations. Atomic force microscopy has revealed growth spirals and unit cell high steps on the (0 2 0) face of crystals grown in the presence of low β-anomer concentration.

  14. Vapor pressure, density, viscosity and refractive index of dimethyl sulfoxide + 1,4-dimethylbenzene system



    Full Text Available This paper reports the experimental results of isothermal vapor–liquid equilibrium data between 303.15 and 333.15 K, and densities, viscosities, refractive indices from 298.15 to 323.15 K of the dimethyl sulfoxide + 1,4-dimethylbenzene system over the entire range of mixture composition. The obtained PTX data were correlated by the Wilson and NRTL models and estimated by the UNIFAC model. The excess Gibbs energy and activity coefficients were calculated and compared with others excess properties. Excess molar volumes, viscosity deviations and deviations in refractivity were calculated from the experimental data; all the computed quantities were fitted to the Redlich–Kister equation. The resulting excess functions were interpreted in terms of structure and interactions.

  15. Excited state proton transfer effect of 7-hydroxyquinoline in dimethyl sulfoxide solvent

    GUO Yang-xue; LI Xiang-ping; ZHENG Jia-jin; ZHANG Gui-lan; LIU Jing-jiang; CHEN Wen-ju


    7-hydroxyquinoline (7-HQ) is a kind of organic molecule with excited state proton transfer (ESPT) effect,and can be used as the material for all optical switching.This optical switching takes place via the ESPT effect depending on its intermolecular hydrogen bond formed with the solvent,and can have the effect of all optical switching.7-HQ can not form intermolecular hydrogen bond with dimethyl sulfoxide (DMSO),so 7-HQ in DMSO solution cannot display the ESPT effect.However,after the solution was radiated by an UV laser, we found that 7-HQ could have ESPT effect.This phenomenon is reported and the mechanism is investigated for the first time in this paper.

  16. Crystal structure of hexakis(dimethyl sulfoxide-κO)manganese(II) tetraiodide

    Haque, Md Azimul


    The title salt, [Mn(C2H6OS)6]I4, is made up from discrete [Mn(DMSO)6]2+ (DMSO is dimethyl sulfoxide) units connected through non-classical hydrogen bonds to linear I4 2- tetraiodide anions. The MnII ion in the cation, situated on a position with site symmetry -3., is octahedrally coordinated by O atoms of the DMSO molecule with an Mn - O distance of 2.1808(12)Å. The I4 2- anion contains a neutral I2 molecule weakly coordinated by two iodide ions, forming a linear centrosymmetric tetraiodide anion. The title compound is isotypic with the Co, Ni, Cu, and Zn analogues.

  17. Methionine sulfoxide reductase A deficiency exacerbates acute liver injury induced by acetaminophen.

    Singh, Mahendra Pratap; Kim, Ki Young; Kim, Hwa-Young


    Acetaminophen (APAP) overdose induces acute liver injury via enhanced oxidative stress and glutathione (GSH) depletion. Methionine sulfoxide reductase A (MsrA) acts as a reactive oxygen species scavenger by catalyzing the cyclic reduction of methionine-S-sulfoxide. Herein, we investigated the protective role of MsrA against APAP-induced liver damage using MsrA gene-deleted mice (MsrA(-/-)). We found that MsrA(-/-) mice were more susceptible to APAP-induced acute liver injury than wild-type mice (MsrA(+/+)). The central lobule area of the MsrA(-/-) liver was more impaired with necrotic lesions. Serum alanine transaminase, aspartate transaminase, and lactate dehydrogenase levels were significantly higher in MsrA(-/-) than in MsrA(+/+) mice after APAP challenge. Deletion of MsrA enhanced APAP-induced hepatic GSH depletion and oxidative stress, leading to increased susceptibility to APAP-induced liver injury in MsrA-deficient mice. APAP challenge increased Nrf2 activation more profoundly in MsrA(-/-) than in MsrA(+/+) livers. Expression and nuclear accumulation of Nrf2 and its target gene expression were significantly elevated in MsrA(-/-) than in MsrA(+/+) livers after APAP challenge. Taken together, our results demonstrate that MsrA protects the liver from APAP-induced toxicity. The data provided herein constitute the first in vivo evidence of the involvement of MsrA in hepatic function under APAP challenge. Copyright © 2017 Elsevier Inc. All rights reserved.

  18. Membrane permeability of the human granulocyte to water, dimethyl sulfoxide, glycerol, propylene glycol and ethylene glycol.

    Vian, Alex M; Higgins, Adam Z


    Granulocytes are currently transfused as soon as possible after collection because they rapidly deteriorate after being removed from the body. This short shelf life complicates the logistics of granulocyte collection, banking, and safety testing. Cryopreservation has the potential to significantly increase shelf life; however, cryopreservation of granulocytes has proven to be difficult. In this study, we investigate the membrane permeability properties of human granulocytes, with the ultimate goal of using membrane transport modeling to facilitate development of improved cryopreservation methods. We first measured the equilibrium volume of human granulocytes in a range of hypo- and hypertonic solutions and fit the resulting data using a Boyle-van't Hoff model. This yielded an isotonic cell volume of 378 μm(3) and an osmotically inactive volume of 165 μm(3). To determine the permeability of the granulocyte membrane to water and cryoprotectant (CPA), cells were injected into well-mixed CPA solution while collecting volume measurements using a Coulter Counter. These experiments were performed at temperatures ranging from 4 to 37°C for exposure to dimethyl sulfoxide, glycerol, ethylene glycol, and propylene glycol. The best-fit water permeability was similar in the presence of all of the CPAs, with an average value at 21°C of 0.18 μmatm(-1)min(-1). The activation energy for water transport ranged from 41 to 61 kJ/mol. The CPA permeability at 21°C was 6.4, 1.0, 8.4, and 4.0 μm/min for dimethyl sulfoxide, glycerol, ethylene glycol, and propylene glycol, respectively, and the activation energy for CPA transport ranged between 59 and 68 kJ/mol.

  19. A novel, molybdenum-containing methionine sulfoxide reductase supports survival of Haemophilus influenzae in an in vivo model of infection

    Rabeb Dhouib


    Full Text Available H. influenzae is a host adapted human mucosal pathogen involved in a variety of acute and chronic respiratory tract infections, including Chronic Obstructive Pulmonary Disease (COPD and asthma, all of which rely on ability to efficiently establish continuing interactions with the host. Here we report the characterization of a novel molybdenum enzyme, TorZ/MtsZ that supports interactions of H. influenzae with host cells during growth in oxygen-limited environments. Strains lacking TorZ/MtsZ showed a reduced ability to survive in contact with epithelial cells as shown by immunofluorescence microscopy and adherence/invasion assays. This included a reduction in the ability of the strain to invade human epithelial cells, a trait that could be linked to the persistence of H. influenzae. The observation that in a murine model of H. influenzae infection, strains lacking TorZ/MtsZ were almost undetectable after 72h of infection, while ~ 3.6 x 103 CFU/mL of the wild type strain were measured under the same conditions is consistent with this view. To understand how TorZ/MtsZ mediates this effect we purified and characterized the enzyme, and were able to show that it is an S- and N-oxide reductase with a stereospecificity for S-sulfoxides. The enzyme converts two physiologically relevant sulfoxides, biotin sulfoxide and methionine sulfoxide, with the kinetic parameters suggesting that methionine sulfoxide is the natural substrate of this enzyme. TorZ/MtsZ was unable to repair sulfoxides in oxidized Calmodulin, suggesting that a role in cell metabolism/ energy generation and not protein repair is the key function of this enzyme. Phylogenetic analyses showed that H.influenzae TorZ/MtsZ is only distantly related to the E. coli TorZ TMAO reductase, but instead is a representative of a new, previously uncharacterized clade of molybdenum enzyme that is widely distributed within the Pasteurellaceae family of pathogenic bacteria. It is likely that MtsZ/TorZ has a

  20. In vitro susceptibilities of the AIDS-associated microsporidian Encephalitozoon intestinalis to albendazole, its sulfoxide metabolite, and 12 additional benzimidazole derivatives.

    Katiyar, S. K.; Edlind, T D


    Recent reports have described the successful treatment of Encephalitozoon intestinalis infection in AIDS patients with albendazole. However, this compound is rapidly metabolized in vivo to albendazole sulfoxide, and furthermore it is only 1 of about 15 commercially developed benzimidazole derivatives. To compare the activities of albendazole, albendazole sulfoxide, and other benzimidazoles, an in vitro system involving infection of green monkey kidney cell (E6) monolayers with E. intestinalis...

  1. trans-Chlorido(dimethyl sulfoxide-κS(pyridine-2-carboxylato-κ2N,Oplatinum(II

    Kwang Ha


    Full Text Available In the title complex, [Pt(C6H4NO2Cl(C2H6OS], the PtII ion is in a distorted square-planar environment defined by the N and O atoms from the chelating pyridine-2-carboxylate (pic anionic ligand, one S atom of the dimethyl sulfoxide molecule and one Cl ion. The complex is disposed about a crystallographic mirror plane parallel to the ac plane passing through all the atoms of the complex except the methyl atoms of the dimethyl sulfoxide. The molecules are stacked in columns along the b axis with a Pt...Pt distance of 4.9508 (5 Å. Within the column, intermolecular C—H...O hydrogen bonds and weak π–π interactions between adjacent pyridine rings are present, the shortest centroid–centroid distance being 5.153 (4 Å.

  2. Volumetric Properties of the Mixture Trichloromethane CHCl3 + C2H6OS Dimethyl sulfoxide (VMSD1211, LB3256_V)

    Cibulka, I.; Fontaine, J.-C.; Sosnkowska-Kehiaian, K.; Kehiaian, H. V.

    This document is part of Subvolume C 'Binary Liquid Systems of Nonelectrolytes III' of Volume 26 'Heats of Mixing, Vapor-Liquid Equilibrium, and Volumetric Properties of Mixtures and Solutions' of Landolt-Börnstein Group IV 'Physical Chemistry'. It contains the Chapter 'Volumetric Properties of the Mixture Trichloromethane CHCl3 + C2H6OS Dimethyl sulfoxide (VMSD1211, LB3256_V)' providing data from direct low-pressure dilatometric measurement of molar excess volume at variable mole fraction and constant temperature.

  3. The synergic extraction of uranium (Ⅵ) with tri-n-butyl phosphate (TBP) and petroleum sulfoxides(PSO)/benzene


    The synergistic extraction of uranium (Ⅵ) from nitric acid aqueous solution with a mixture of tri-n-butyl phosphate (TBP) and petroleum sulfoxides(PSO) in benzene was studied. It has been found that the maximum synergistic extraction effect occurs where the molar ratio of PSO to TBP is one to two. The composition of the complex of synergistic extraction is UO2(NO3)2.TB P.PSO. The formation constant of the complex KTp=57.44.

  4. Enhancing stress tolerance by overexpression of a methionine sulfoxide reductase A (MsrA) gene in Pleurotus ostreatus.

    Yin, Chaomin; Zheng, Liesheng; Zhu, Jihong; Chen, Liguo; Ma, Aimin


    Proteins are subjected to modification by reactive oxygen species (ROS), and oxidation of specific amino acid residues can impair their biological functions. Methionine as a sulfur-containing amino acid is easily oxidized to methionine sulfoxide (MetSO). The modified methionine can be repaired by methionine sulfoxide reductase (Msr), an enzyme that reverses oxidation of methionine in proteins. In this study, a methionine sulfoxide reductase A (PoMsrA) gene from Pleurotus ostreatus was cloned and characterized. Furthermore, the function of PoMsrA gene was analyzed by overexpression in P. ostreatus via Agrobacterium-mediated transformation. Stable integration of the target gene into the genome of P. ostreatus was confirmed by PCR, fluorescence observation, and Southern blot hybridization. qRT-PCR analysis showed that PoMsrA was highly expressed in the stage of mature and young fruiting bodies as well as the osmotic stress condition of 0.3 M NaCl. Additionally, the transgenic strains with PoMsrA overexpression exhibited an enhanced tolerance to high temperature, high osmotic stress, and oxidative stress. This suggests that PoMsrA is an active player in the protection of the cellular proteins from oxidative stress damage.

  5. Methionine sulfoxide profiling of milk proteins to assess the influence of lipids on protein oxidation in milk.

    Wüst, Johannes; Pischetsrieder, Monika


    Thermal treatment of milk and milk products leads to protein oxidation, mainly the formation of methionine sulfoxide. Reactive oxygen species, responsible for the oxidation, can be generated by Maillard reaction, autoxidation of sugars, or lipid peroxidation. The present study investigated the influence of milk fat on methionine oxidation in milk. For this purpose, quantitative methionine sulfoxide profiling of all ten methionine residues of β-lactoglobulin, α-lactalbumin, and αs1-casein was carried out by ultrahigh-performance liquid chromatography-electrospray ionization tandem mass spectrometry with scheduled multiple reaction monitoring (UHPLC-ESI-MS/MS-sMRM). Analysis of defatted and regular raw milk samples after heating for up to 8 min at 120 °C and analysis of ultrahigh-temperature milk samples with 0.1%, 1.5%, and 3.5% fat revealed that methionine oxidation of the five residues of the whey proteins and of residues M 123, M 135, and M 196 of αs1-casein was not affected or even suppressed in the presence of milk fat. Only the oxidation of residues M 54 and M 60 of αs1-casein was promoted by lipids. In evaporated milk samples, formation of methionine sulfoxide was hardly influenced by the fat content of the samples. Thus, it can be concluded that lipid oxidation products are not the major cause of methionine oxidation in milk.

  6. Characterization of a novel methionine sulfoxide reductase A from tomato (Solanum lycopersicum ), and its protecting role in Escherichia coli.

    Dai, Changbo; Singh, Naresh Kumar; Park, Myungho


    Methionine sulfoxide reductase A (MSRA) is a ubiquitous enzyme that has been demonstrated to reduce the S enantiomer of methionine sulfoxide (MetSO) to methionine (Met) and can protect cells against oxidative damage. In this study, we isolated a novel MSRA (SlMSRA2) from Micro-Tom (Solanum lycopersicum L. cv. Micro-Tom) and characterized it by subcloning the coding sequence into a pET expression system. Purified recombinant protein was assayed by HPLC after expression and refolding. This analysis revealed the absolute specificity for methionine-S-sulfoxide and the enzyme was able to convert both free and protein-bound MetSO to Met in the presence of DTT. In addition, the optimal pH, appropriate temperature, and Km and Kcat values for MSRA2 were observed as 8.5, 25oC, 352 ± 25 μM, and 0.066 ± 0.009 S(-1), respectively. Disk inhibition and growth rate assays indicated that SlMSRA2 may play an essential function in protecting E. coli against oxidative damage.

  7. Sulfonic acid heterogeneous catalysts for dehydration of C6-monosaccharides to 5-hydroxymethylfurfural in dimethyl sulfoxide

    Gabriel Morales; Juan A.Melero; Marta Paniagua; Jose Iglesias; Blanca Hernández; María Sanz


    Sulfonic acid-functionalized heterogeneous catalysts have been evaluated in the catalytic dehydra-tion of C6 monosaccharides into 5-hydroxymethylfurfural (HMF) using dimethyl sulfoxide (DMSO) as solvent. Sulfonic commercial resin Amberlyst-70 was the most active catalyst, which was as-cribed to its higher concentration of sulfonic acid sites as compared with the other catalysts, and it gave 93 mol%yield of HMF from fructose in 1 h. With glucose as the starting material, which is a much more difficult reaction, the reaction conditions (time, temperature, and catalyst loading) were optimized for Amberlyst-70 by a response surface methodology, which gave a maximum HMF yield of 33 mol%at 147°C with 23 wt%catalyst loading based on glucose and 24 h reaction time. DMSO promotes the dehydration of glucose into anhydroglucose, which acts as a reservoir of the substrate to facilitate the production of HMF by reducing side reactions. Catalyst reuse without a regeneration treatment showed a gradual but not very significant decay in catalytic activity.

  8. Crystallization of Ice in Aqueous Solutions of Glycerol and Dimethyl Sulfoxide. 1. A Comparison of Mechanisms

    Hey; Macfarlane


    The crystallization of ice from aqueous solutions of glycerol and dimethyl sulfoxide (Me2SO) has been studied using differential scanning calorimetry. In particular, the ice crystallization behavior of glycerol and Me2SO solutions containing approximately the same mole percent solute concentration (i.e., approximately 16 mol%) has been compared. These solutions (45 w/w% Me2SO (15.9 mol%) and 50 w/w% glycerol (16.4 mol%)) were shown to exhibit markedly different ice crystallization properties. For example, the peak homogeneous nucleation temperature of the Me2SO solution was observed to be 3°C above Tg, whereas the peak homogeneous nucleation temperature of the glycerol solution was shown to be 20°C above Tg. Further, the 50 w/w% glycerol solution was shown to devitrify at temperatures close to those of the peak nucleation rate, whereas the Me2SO solution was found to devitrify at temperatures much higher than the peak nucleation temperature. This, along with evidence from emulsion-based calorimetry experiments, indicates that the nucleation leading to devitrification in 45 w/w% Me2SO solutions is largely heterogeneous in nature.

  9. Electrodeposition of uranium in dimethyl sulfoxide and its inhibition by acetylacetone as studied by EQCM

    Shirasaki, K. [Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577 (Japan)]. E-mail:; Yamamura, T. [Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577 (Japan); Herai, T. [Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577 (Japan); Shiokawa, Y. [Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577 (Japan)


    In the study of the all-uranium redox-flow battery with a high efficiency, electrochemical investigations of the negative electrode reaction, i.e. U(IV)/U(III) of uranium {beta}-diketone complexes, is necessary in aprotic solvents. In our recent studies, the uranium(IV) acelylacetonate, known to show the simplest voltammograms due to a quasi-reversible U(IV)/U(III) reaction at -2.6 V versus Fc/Fc{sup +} in the solvent with the small donor number, shows more complicated voltammograms in the solvents with the larger donor numbers such as dimethyl sulfoxide (DMSO). For U{sup 4+} ion without acetylacetone in such solvents, several researchers reported an electrodeposition at around -1.6 to -2 V versus Fc/Fc{sup +}, whereas its details have not known at all. Therefore in this study, the electrode reactions of the U(IV)/U(III) and the U(III)/U(0) reaction of U(dmso){sub 8}(ClO{sub 4}){sub 4} were investigated by direct monitoring of weight changes of a Au electrode during potential sweeps by using the EQCM, as well as the HMDE. Also, an inhibition of the uranium electrodeposition by an addition of the acetylacetone was investigated.

  10. Methionine sulfoxide reductase A regulates cell growth through the p53-p21 pathway

    Choi, Seung Hee [Department of Biochemistry and Molecular Biology, Yeungnam University College of Medicine, Daegu 705-717 (Korea, Republic of); Kim, Hwa-Young, E-mail: [Department of Biochemistry and Molecular Biology, Yeungnam University College of Medicine, Daegu 705-717 (Korea, Republic of)


    Highlights: Black-Right-Pointing-Pointer Down-regulation of MsrA inhibits normal cell proliferation. Black-Right-Pointing-Pointer MsrA deficiency leads to an increase in p21 by enhanced p53 acetylation. Black-Right-Pointing-Pointer Down-regulation of MsrA causes cell cycle arrest at the G{sub 2}/M stage. Black-Right-Pointing-Pointer MsrA is a regulator of cell growth that mediates the p53-p21 pathway. -- Abstract: MsrA is an oxidoreductase that catalyzes the stereospecific reduction of methionine-S-sulfoxide to methionine. Although MsrA is well-characterized as an antioxidant and has been implicated in the aging process and cellular senescence, its roles in cell proliferation are poorly understood. Here, we report a critical role of MsrA in normal cell proliferation and describe the regulation mechanism of cell growth by this protein. Down-regulation of MsrA inhibited cell proliferation, but MsrA overexpression did not promote it. MsrA deficiency led to an increase in p21, a major cyclin-dependent kinase inhibitor, thereby causing cell cycle arrest at the G{sub 2}/M stage. While protein levels of p53 were not altered upon MsrA deficiency, its acetylation level was significantly elevated, which subsequently activated p21 transcription. The data suggest that MsrA is a regulator of cell growth that mediates the p53-p21 pathway.

  11. Dissolution of brominated epoxy resins by dimethyl sulfoxide to separate waste printed circuit boards.

    Zhu, Ping; Chen, Yan; Wang, Liangyou; Qian, Guangren; Zhang, Wei Jie; Zhou, Ming; Zhou, Jin


    Improved methods are required for the recycling of waste printed circuit boards (WPCBs). In this study, WPCBs (1-1.5 cm(2)) were separated into their components using dimethyl sulfoxide (DMSO) at 60 °C for 45 min and a metallographic microscope was used to verify their delamination. An increased incubation time of 210 min yielded a complete separation of WPCBs into their components, and copper foils and glass fibers were obtained. The separation time decreased with increasing temperature. When the WPCB size was increased to 2-3 cm(2), the temperature required for complete separation increased to 90 °C. When the temperature was increased to 135 °C, liquid photo solder resists could be removed from the copper foil surfaces. The DMSO was regenerated by rotary decompression evaporation, and residues were obtained. Fourier transform infrared spectroscopy (FT-IR), thermal analysis, nuclear magnetic resonance, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were used to verify that these residues were brominated epoxy resins. From FT-IR analysis after the dissolution of brominated epoxy resins in DMSO it was deduced that hydrogen bonding may play an important role in the dissolution mechanism. This novel technology offers a method for separating valuable materials and preventing environmental pollution from WPCBs.

  12. Effect of sodium chloride on efficiency of cisplatinum dissolved in dimethyl sulfoxide: an in vitro study.

    Doun, Seyed Kazem Bagherpour; Khor, Sohrab Halal; Qujeq, Dardi; Shahmabadi, Hasan Ebrahimi; Alavi, Seyed Ebrahim; Movahedi, Fatemeh; Akbarzadeh, Azim


    Cisplatinum (Cispt) is an anti-cancer drug with a low level of solubility. One of Cispt's solvents is dimethyl sulfoxide (DMSO) which can be substituted with chlorine of drug as Cispt's solvent. Applying such a solvent in biological studies is impossible due to intense reduction in activity. On the other hand, it is specified that Cispt's stability is increased in aqueous media by increasing sodium chloride (NaCl) concentration up to 0.9 %. Consequently, we intended to study the effect of DMSO on cytotoxicity of Cispt in presence of sodium. MTT assay was employed to study cytotoxicity effect of Cispt + NaCl + DMSO and Cispt + DMSO on G-292 cell line. Cytotoxicity in dilutions of 300 and 9 (p reduction of 45 % in cytotoxicity of Cispt in Cispt + DMSO formulation. Studying chemical structure of Cispt and Cispt dissolved in DMSO showed that NaCl cannot inhibit inactivating effect of DMSO on Cispt and effect of this solvent on Cispt is independent from presence of NaCl. Results represented that using NaCl does not result in stability and keeping cytotoxicity properties of Cispt in DMSO. Findings suggest more studies for using DMSO as a solvent of Cispt.

  13. Electrochemical machining of gold microstructures in LiCl/dimethyl sulfoxide.

    Ma, Xinzhou; Bán, Andreas; Schuster, Rolf


    LiCl/dimethyl sulfoxide (DMSO) electrolytes were applied for the electrochemical micromachining of Au. Upon the application of short potential pulses in the nanosecond range to a small carbon-fiber electrode, three-dimensional microstructures with high aspect ratios were fabricated. We achieved machining resolutions down to about 100 nm. In order to find appropriate machining parameters, that is, tool and workpiece rest potentials, the electrochemical behavior of Au in LiCl/DMSO solutions with and without addition of water was studied by cyclic voltammetry. In waterless electrolyte Au dissolves predominantly as Au(I), whereas upon the addition of water the formation of Au(III) becomes increasingly important. Because of the low conductivity of LiCl/DMSO compared with aqueous electrolytes, high machining precision is obtained with moderately short pulses. Furthermore, the redeposition of dissolved Au can be effectively avoided, since Au dissolution in LiCl/DMSO is highly irreversible. Both observations render LiCl/DMSO an appropriate electrolyte for the routine electrochemical micromachining of Au.

  14. Characterization of increased drug metabolism activity in dimethyl sulfoxide (DMSO)-treated Huh7 hepatoma cells.

    Choi, S; Sainz, B; Corcoran, P; Uprichard, S; Jeong, H


    The objective of this study was to characterize Huh7 cells' baseline capacity to metabolize drugs and to investigate whether the drug metabolism was enhanced upon treatment with dimethyl sulfoxide (DMSO). The messenger RNA (mRNA) levels of major Phase I and Phase II enzymes were determined by quantitative real-time-polymerase chain reaction (RT-PCR), and activities of major drug-metabolizing enzymes were examined using probe drugs by analysing relevant metabolite production rates. The expression levels of drug-metabolizing enzymes in control Huh7 cells were generally very low, but DMSO treatment dramatically increased the mRNA levels of most drug-metabolizing enzymes as well as other liver-specific proteins. Importantly, functionality assays confirmed concomitant increases in drug-metabolizing enzyme activity. Additionally, treatment of the Huh7 cells with 3-methylcholanthrene induced cytochrome P450 (CYP) 1A1 expression. The results indicate that DMSO treatment of Huh7 cells profoundly enhances their differentiation state, thus improving the usefulness of this common cell line as an in vitro hepatocyte model.

  15. Dimethyl sulfoxide (DMSO) as intravesical therapy for interstitial cystitis/bladder pain syndrome: A review.

    Rawls, William F; Cox, Lindsey; Rovner, Eric S


    The purpose of this review is to update the current understanding of dimethyl sulfoxide (DMSO) and its role in the treatment of interstitial cystitis (IC). A systematic review was conducted using the PRIMSA checklist to identify published articles involving intravesical DMSO for the treatment of IC. Thirteen cohort studies and three randomized-controlled trials were identified. Response rates relying on subjective measurement scores range from 61 to 95%. No increased efficacy was found with "cocktail" DMSO therapy. Great variation existed in diagnostic criteria, DMSO instillation protocols and response measurements. The current evidence backing DMSO is a constellation of cohort studies and a single randomized-controlled trial versus placebo. The optimal dose, dwell time, type of IC most likely to respond to DMSO, definitions of success/failure and the number of treatments are not universally agreed upon. Improvements in study design, phenotyping patients based on symptoms, as well as the emergence of reliable biomarkers of the disease may better guide the use of DMSO in the future. © 2017 Wiley Periodicals, Inc.

  16. Cytotoxicity of dimethyl sulfoxide (DMSO) in direct contact with odontoblast-like cells.

    Hebling, J; Bianchi, L; Basso, F G; Scheffel, D L; Soares, D G; Carrilho, M R O; Pashley, D H; Tjäderhane, L; de Souza Costa, C A


    To evaluate the cytotoxicity of dimethyl sulfoxide (DMSO) on the repair-related activity of cultured odontoblast-like MDPC-23 cells. Solutions with different concentrations of DMSO (0.05, 0.1, 0.3, 0.5 and 1.0 mM), diluted in culture medium (DMEM), were placed in contact with MDPC-23 cells (5 × 104 cells/cm(2)) for 24 h. Eight replicates (n = 8) were prepared for each solutions for the following methods of analysis: violet crystal dye for cell adhesion (CA), quantification of total protein (TP), alizarin red for mineralization nodules formation (MN) and cell death by necrosis (flow cytometry); while twelve replicates (n = 12) were prepared for viable cell number (Trypan Blue) and cell viability (MTT assay). Data were analyzed by ANOVA and Tukey or Kruskal-Wallis and Mann-Whitney's tests (p DMSO at any concentration, with no statistical significant difference among the groups. A significant reduction in total protein production was observed for 0.5 and 1.0 mM of DMSO compared to the control while increased mineralized nodules formation was seen only for 1.0 mM DMSO. DMSO caused no or minor cytotoxic effects on the pulp tissue repair-related activity of odontoblast-like cells. Copyright © 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

  17. Dimethyl sulfoxide (DMSO) exacerbates cisplatin-induced sensory hair cell death in zebrafish (Danio rerio).

    Uribe, Phillip M; Mueller, Melissa A; Gleichman, Julia S; Kramer, Matthew D; Wang, Qi; Sibrian-Vazquez, Martha; Strongin, Robert M; Steyger, Peter S; Cotanche, Douglas A; Matsui, Jonathan I


    Inner ear sensory hair cells die following exposure to aminoglycoside antibiotics or chemotherapeutics like cisplatin, leading to permanent auditory and/or balance deficits in humans. Zebrafish (Danio rerio) are used to study drug-induced sensory hair cell death since their hair cells are similar in structure and function to those found in humans. We developed a cisplatin dose-response curve using a transgenic line of zebrafish that expresses membrane-targeted green fluorescent protein under the control of the Brn3c promoter/enhancer. Recently, several small molecule screens have been conducted using zebrafish to identify potential pharmacological agents that could be used to protect sensory hair cells in the presence of ototoxic drugs. Dimethyl sulfoxide (DMSO) is typically used as a solvent for many pharmacological agents in sensory hair cell cytotoxicity assays. Serendipitously, we found that DMSO potentiated the effects of cisplatin and killed more sensory hair cells than treatment with cisplatin alone. Yet, DMSO alone did not kill hair cells. We did not observe the synergistic effects of DMSO with the ototoxic aminoglycoside antibiotic neomycin. Cisplatin treatment with other commonly used organic solvents (i.e. ethanol, methanol, and polyethylene glycol 400) also did not result in increased cell death compared to cisplatin treatment alone. Thus, caution should be exercised when interpreting data generated from small molecule screens since many compounds are dissolved in DMSO.

  18. Effect of dimethyl sulfoxide (DMSO) on cryopreservation of porcine mesenchymal stem cells (pMSCs).

    Ock, Sun-A; Rho, Gyu-Jin


    Dimethyl sulfoxide (DMSO), a commonly used cryoprotectant in cryopreservation procedures, is detrimental to viability of cells. In this view point, a comparative study was carried out to evaluate the effect of DMSO on porcine mesenchymal stem cells (pMSCs). We compared the viability, colony forming unit-fibroblast (CFU-F) assay, expression of Bak and Bcl2 genes, Bcl2 protein antigen, and CD90 in pMSCs cryopreserved with 5%, 10%, and 20% DMSO. pMSCs isolated from bone marrow were characterized by alkaline phosphatase activity and the expression of transcription factors, such as Oct 3/4, Nanog, and Sox2. The cells were then cryopreserved by cooling at a rate of -1°C/min in a programmable freezer and stored in liquid nitrogen. The results of survival of pMSCs cryopreserved at 5% DMSO were comparable to control group (fresh pMSCs). The survival and the number of colonies formed in cryopreserved pMSCs were inversely proportional to the concentration of DMSO. The number of colonies formed in pMSCs cryopreserved with all concentrations of DMSO was significantly (p DMSO, this study strongly suggests the use of 5% DMSO in cryopreservation of pMSCs as an alternative to conventional 10% DMSO.

  19. Factors affecting degradation of dimethyl sulfoxide (DMSO) by fluidized-bed Fenton process.

    Bellotindos, Luzvisminda M; Lu, Meng-Hsuan; Methatham, Thanakorn; Lu, Ming-Chun


    In this study, the target compound is dimethyl sulfoxide (DMSO), which is used as a photoresist stripping solvent in the semiconductor and thin-film transistor liquid crystal display (TFT-LCD) manufacturing processes. The effects of the operating parameters (pH, Fe(2+) and H2O2 concentrations) on the degradation of DMSO in the fluidized-bed Fenton process were examined. This study used the Box-Behnken design (BBD) to investigate the optimum conditions of DMSO degradation. The highest DMSO removal was 98 % for pH 3, when the H2O2 to Fe(2+) molar ratio was 12. At pH 2 and 4, the highest DMSO removal was 82 %, when the H2O2 to Fe(2+) molar ratio was 6.5. The correlation of DMSO removal showed that the effect of the parameters on DMSO removal followed the order Fe(2+) > H2O2 > pH. From the BBD prediction, the optimum conditions were pH 3, 5 mM of Fe(2+), and 60 mM of H2O2. The difference between the experimental value (98 %) and the predicted value (96 %) was not significant. The removal efficiencies of DMSO, chemical oxygen demand (COD), total organic carbon (TOC), and iron in the fluidized-bed Fenton process were higher than those in the traditional Fenton process.

  20. Dimethyl sulfoxide (DMSO) produces widespread apoptosis in the developing central nervous system.

    Hanslick, Jennifer L; Lau, Karen; Noguchi, Kevin K; Olney, John W; Zorumski, Charles F; Mennerick, Steven; Farber, Nuri B


    Dimethyl sulfoxide (DMSO) is a solvent that is routinely used as a cryopreservative in allogous bone marrow and organ transplantation. We exposed C57Bl/6 mice of varying postnatal ages (P0-P30) to DMSO in order to study whether DMSO could produce apoptotic degeneration in the developing CNS. DMSO produced widespread apoptosis in the developing mouse brain at all ages tested. Damage was greatest at P7. Significant elevations above the background rate of apoptosis occurred at the lowest dose tested, 0.3 ml/kg. In an in vitro rat hippocampal culture preparation, DMSO produced neuronal loss at concentrations of 0.5% and 1.0%. The ability of DMSO to damage neurons in dissociated cultures indicates that the toxicity likely results from a direct cellular effect. Because children, who undergo bone marrow transplantation, are routinely exposed to DMSO at doses higher than 0.3 ml/kg, there is concern that DMSO might be producing similar damage in human children.

  1. Dimethyl sulfoxide (DMSO) attenuates the inflammatory response in the in vitro intestinal Caco-2 cell model.

    Hollebeeck, Sylvie; Raas, Thomas; Piront, Neil; Schneider, Yves-Jacques; Toussaint, Olivier; Larondelle, Yvan; During, Alexandrine


    This study aimed to investigate dose effects of dimethyl sulfoxide (DMSO) (0.05-1%) on the intestinal inflammatory response in confluent- and differentiated-Caco-2 cells stimulated with interleukin (IL)-1β or a pro-inflammatory cocktail for 24 h. Cyclooxygenase-2 (COX-2) activity was assayed by incubating inflamed cells with arachidonic acid and then measuring prostaglandin-E(2) (PGE(2)) produced. Soluble mediators (IL-8, IL-6, macrophage chemoattractant protein-1 (MCP-1), and COX-2-derived PGE(2)) were quantified by enzyme immunoassays and mRNA expression of 33 proteins by high throughput TaqMan Low Density Array. Data showed that DMSO decreased induced IL-6 and MCP-1 secretions in a dose-dependent manner (PDMSO dose-dependently reduced COX-2-derived PGE(2) (PDMSO at 0.5% decreased significantly mRNA levels of 14 proteins involved in the inflammatory response (including IL-6, IL-1α, IL-1β, and COX-2). Thus, DMSO at low concentrations (0.1-0.5%) exhibits anti-inflammatory properties in the in vitro intestinal Caco-2 cell model. This point is important to be taken into account when assessing anti-inflammatory properties of bioactive compounds requiring DMSO as vehicle, such as phenolic compounds, in order to avoid miss-interpretation of the results. Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

  2. Marmoset induced pluripotent stem cells: Robust neural differentiation following pretreatment with dimethyl sulfoxide

    Zhifang Qiu


    Full Text Available The marmoset is an important nonhuman primate model for regenerative medicine. For experimental autologous cell therapy based on induced pluripotent (iPS cells in the marmoset, cells must be able to undergo robust and reliable directed differentiation that will not require customization for each specific iPS cell clone. When marmoset iPS cells were aggregated in a hanging drop format for 3 days, followed by exposure to dual SMAD inhibitors and retinoic acid in monolayer culture for 3 days, we found substantial variability in the response of different iPS cell clones. However, when clones were pretreated with 0.05–2% dimethyl sulfoxide (DMSO for 24 hours, all clones showed a very similar maximal response to the directed differentiation scheme. Peak responses were observed at 0.5% DMSO in two clones and at 1% DMSO in a third clone. When patterns of gene expression were examined by microarray analysis, hierarchical clustering showed very similar responses in all 3 clones when they were pretreated with optimal DMSO concentrations. The change in phenotype following exposure to DMSO and the 6 day hanging drop/monolayer treatment was confirmed by immunocytochemistry. Analysis of DNA content in DMSO-exposed cells indicated that it is unlikely that DMSO acts by causing cells to exit from the cell cycle. This approach should be generally valuable in the directed neural differentiation of pluripotent cells for experimental cell therapy.

  3. Regulation of Expression of Oxacillin-Inducible Methionine Sulfoxide Reductases in Staphylococcus aureus

    Kyle R. Baum


    Full Text Available Cell wall-active antibiotics cause induction of a locus that leads to elevated synthesis of two methionine sulfoxide reductases (MsrA1 and MsrB in Staphylococcus aureus. To understand the regulation of this locus, reporter strains were constructed by integrating a DNA fragment consisting of the msrA1/msrB promoter in front of a promoterless lacZ gene in the chromosome of wild-type and MsrA1-, MsrB-, MsrA1/MsrB-, and SigB-deficient methicillin-sensitive S. aureus strain SH1000 and methicillin-resistant S. aureus strain COL. These reporter strains were cultured in TSB and the cellular levels of β-galactosidase activity in these cultures were assayed during different growth phases. β-galactosidase activity assays demonstrated that the lack of MsrA1, MsrB, and SigB upregulated the msrA1/msrB promoter in S. aureus strain SH1000. In S. aureus strain COL, the highest level of β-galactosidase activity was observed under the conditions when both MsrA1 and MsrB proteins were absent. The data suggest that the msrA1/msrB locus, in part, is negatively regulated by MsrA1, MsrB, and SigB in S. aureus.

  4. Structural, energetic, and electronic properties of La(III)-dimethyl sulfoxide clusters.

    Bodo, Enrico; Chiricotto, Mara; Spezia, Riccardo


    By using accurate density functional theory calculations, we have studied the cluster complexes of a La(3+) ion interacting with a small number of dimethyl sulfoxide (DMSO) molecules of growing size (from 1 to 12). Extended structural, energetic, and electronic structure analyses have been performed to provide a complete picture of the physical properties that are the basis of the interaction of La(III) with DMSO. Recent experimental data in the solid and liquid phase have suggested a coordination number of 8 DMSO molecules with a square antiprism geometry arranged similarly in the liquid and crystalline phases. By using a cluster approach on the La(3+)(DMSO)n gas phase isolated structures, we have found that the 8-fold geometry, albeit less regular than in the crystal, is probably the most stable cluster. Furthermore, we provide new evidence of a 9-fold complexation geometric arrangement that is competitive (at least energetically) with the 8-fold one and that might suggest the existence of transient structures with higher coordination numbers in the liquid phase.

  5. Dimethyl sulfoxide enhances lipid synthesis and secretion by long-term cultures of adult rat hepatocytes.

    De La Vega, F M; Mendoza-Figueroa, T


    Dimethyl sulfoxide (DMSO) was tested for its effects on lipid metabolism of long-term cultures of adult rat hepatocytes. The addition of 1% DMSO to 3T3-hepatocyte cultures was not toxic to cells and in fact treated cultures maintained better their characteristic morphology for up to 14 days of exposure. DMSO treatment increased 2-3 fold the de novo synthesis of total lipids from[14C]acetate. The analysis by thin layer chromatography of cellular and secreted lipids revealed that DMSO increased the levels of cellular triglycerides, phospholipides and free and sterified cholesterol at 7 days of exposure while at 14 days there was also a 2-3-fold increase in medium secreted lipids. Additionally, DMSO increased the activity of glycerol-phosphate dehydrogenase, a marker enzyme of glycerolipid synthesis, by greater than 50% at either 7 or 14 days of exposure. These results show that 1% DMSO not only is not detrimental to cultured hepatocytes but also enhances lipid synthesis and secretion, both hepatic-differentiated functions.

  6. Methionine Sulfoxide Reductases Protect against Oxidative Stress in Staphylococcus aureus Encountering Exogenous Oxidants and Human Neutrophils

    Pang, Yun Yun; Schwartz, Jamie; Bloomberg, Sarah; Boyd, Jeffrey M; Horswill, Alexander R.; Nauseef, William M.


    To establish infection successfully, S. aureus must evade clearance by polymorphonuclear neutrophils (PMN). We studied the expression and regulation of the methionine sulfoxide reductases (Msr) that are involved in the repair of oxidized staphylococcal proteins and investigated their influence over the fate of S. aureus exposed to oxidants or PMN. We evaluated a mutant deficient in msrA1 and msrB for susceptibility to hydrogen peroxide, hypochlorous acid and PMN. The expression of msrA1 in wild-type bacteria ingested by human PMN was assessed by real-time PCR. The regulation of msr was studied by screening a library of two-component regulatory system (TCS) mutants for altered msr responses. Relative to the wild-type, bacteria deficient in Msr were more susceptible to oxidants and to PMN. Upregulation of staphylococcal msrA1 occurred within the phagosomes of normal PMN and PMN deficient in NADPH oxidase activity. Furthermore, PMN granule-rich extract stimulated the upregulation of msrA1. Modulation of msrA1 within PMN was shown to be partly dependent on the VraSR TCS. Msr contributes to staphylococcal responses to oxidative attack and PMN. Our study highlights a novel interaction between the oxidative protein repair pathway and the VraSR TCS that is involved in cell wall homeostasis. PMID:24247266

  7. NIa-pro of Papaya ringspot virus interacts with papaya methionine sulfoxide reductase B1.

    Gao, Le; Shen, Wentao; Yan, Pu; Tuo, Decai; Li, Xiaoying; Zhou, Peng


    A chloroplast-localized papaya methionine sulfoxide reductase B1 (PaMsrB1) interacting with Papaya ringspot virus (PRSV) NIa-Pro was identified using a Sos recruitment two-hybrid system (SRS). SRS analysis of several deletion mutants of PRSV NIa-Pro and PaMsrB1 demonstrated that the C-terminal (residues 133-239) fragment of PRSV NIa-Pro and residues 112-175 of PaMsrB1 were necessary for this interaction between PRSV NIa-Pro and PaMsrB1. MsrB1 can repair Met-oxidized proteins damaged by reactive oxygen species (ROS). We confirmed that PRSV infection leads to ROS accumulation and a slight upregulation of level PaMsrB1 mRNA in papaya. This interaction between PaMsrB1 with PRSV NIa-Pro may disturb the import of PaMsrB1 into the chloroplasts. These results suggest that this specific interaction could interfere with PaMsrB1 into the chloroplasts to scavenge ROS caused by PRSV infection. This may be a novel mechanism of PRSV towards the host defense. Copyright © 2012 Elsevier Inc. All rights reserved.

  8. [Permeability of isolated rat hepatocyte plasma membranes for molecules of dimethyl sulfoxide].

    Kuleshova, L G; Gordienko, E A; Kovalenko, I F


    We have studied permeability of isolated rat hepatocyte membranes for molecules of dimethyl sulfoxide (DMSO) at different hypertonicity of a cryoprotective medium. The permeability coefficient of hepatocyte membranes κ1 for DMSO molecules was shown to be the differential function of osmotic pressure between a cell and an extracellular medium. Ten-fold augmentation of DMSO concentration in the cryoprotective medium causes the decrease of permeability coefficients κ1 probably associated with the increased viscosity in membrane-adjacent liquid layers as well as partial limitations appeared as a result of change in cell membrane shape after hepatocyte dehydration. We have found out that in aqueous solutions of NaCl (2246 mOsm/l) and DMSO (2250 mOsm/l) the filtration coefficient L(p) in the presence of a penetrating cryoprotectant (L(pDMSO) = (4.45 ± 0.04) x 10(-14) m3/Ns) is 3 orders lower compared to the case with electrolyte (L(pNaCl) = (2.25 ± 0.25) x 10(-11) m3/Ns). This phenomenon is stipulated by the cross impact of flows of a cryoprotectant and water at the stage of cell dehydration. Pronounced lipophilicity of DMSO, geometric parameters of its molecule as well as the presence of large aqueous pores in rat hepatocyte membranes allow of suggesting the availability of two ways of penetrating this cryoprotectant into the cells by non-specific diffusion through membrane lipid areas and hydrophilic channels.

  9. Individual cryopreservation with dimethyl sulfoxide and polyvinylpyrrolidone of ejaculates and pooled semen of three avian species.

    Herrera, J A; Quintana, J A; López, M A; Betancourt, M; Fierro, R


    Artificial insemination (AI) has been used for avian reproduction due to the discovery of cryoprotectants extending its usefulness both in production of domestic fowl and conservation of wild species. The goal of this study was to assess the effect on domestic and wild fowl pooled semen and individual ejaculate cryopreservation with dimethyl sulfoxide (DMSO) and polyvinylpyrrolidone (PVP). Twenty ejaculates and twenty samples of pooled semen of roosters, pheasants and hawks were frozen in media containing DMSO or PVP. DMSO and PVP cryopreservation are equally effective both for ejaculates and pooled semen. Even PVP is a good alternative since no significant difference was found when compared to DMSO. The fertilizing capacity of fresh and cryopreserved pooled semen was analyzed through AI of hens and female pheasants. Similar fertility rates using DMSO, PVP or frozen-thawed samples demonstrated that reproduction is possible through the use of cryopreserved semen. In the case of female pheasants, the same values were obtained with both cryopreserved and fresh semen.

  10. Intravesical Dimethyl Sulfoxide Inhibits Acute and Chronic Bladder Inflammation in Transgenic Experimental Autoimmune Cystitis Models

    Ronald Kim


    Full Text Available New animal models are greatly needed in interstitial cystitis/painful bladder syndrome (IC/PBS research. We recently developed a novel transgenic cystitis model (URO-OVA mice that mimics certain key aspects of IC/PBS pathophysiology. This paper aimed to determine whether URO-OVA cystitis model was responsive to intravesical dimethyl sulfoxide (DMSO and if so identify the mechanisms of DMSO action. URO-OVA mice developed acute cystitis upon adoptive transfer of OVA-specific OT-I splenocytes. Compared to PBS-treated bladders, the bladders treated with 50% DMSO exhibited markedly reduced bladder histopathology and expression of various inflammatory factor mRNAs. Intravesical DMSO treatment also effectively inhibited bladder inflammation in a spontaneous chronic cystitis model (URO-OVA/OT-I mice. Studies further revealed that DMSO could impair effector T cells in a dose-dependent manner in vitro. Taken together, our results suggest that intravesical DMSO improves the bladder histopathology of IC/PBS patients because of its ability to interfere with multiple inflammatory and bladder cell types.

  11. Dimethyl Sulfoxide Perturbs Cell Cycle Progression and Spindle Organization in Porcine Meiotic Oocytes.

    Xuan Li

    Full Text Available Meiotic maturation of mammalian oocytes is a precisely orchestrated and complex process. Dimethyl sulfoxide (DMSO, a widely used solvent, drug, and cryoprotectant, is capable of disturbing asymmetric cytokinesis of oocyte meiosis in mice. However, in pigs, DMSO's effect on oocyte meiosis still remains unknown. We aimed to evaluate if DMSO treatment will affect porcine oocyte meiosis and the underlying molecular changes as well. Interestingly, we did not observe the formation of the large first polar body and symmetric division for porcine oocytes treated with DMSO, contrary to findings reported in mice. 3% DMSO treatment could inhibit cumulus expansion, increase nuclear abnormality, disturb spindle organization, decrease reactive oxygen species level, and elevate mitochondrial membrane potential of porcine oocytes. There was no effect on germinal vesicle breakdown rate regardless of DMSO concentration. 3% DMSO treatment did not affect expression of genes involved in spindle organization (Bub1 and Mad2 and apoptosis (NF-κB, Pten, Bcl2, Caspase3 and Caspase9, however, it significantly decreased expression levels of pluripotency genes (Oct4, Sox2 and Lin28 in mature oocytes. Therefore, we demonstrated that disturbed cumulus expansion, chromosome alignment, spindle organization and pluripotency gene expression could be responsible for DMSO-induced porcine oocyte meiotic arrest and the lower capacity of subsequent embryo development. Our results provide new insights on DMSO's effect on porcine oocyte meiosis and raise safety concerns over DMSO's usage on female reproduction in both farm animals and humans.

  12. The Role of Dimethyl Sulfoxide in the Reductive Dissolution of Iron in Marine Aerosols

    Key, J. M.; Johansen, A. M.


    Very little is known about the effects of atmospheric iron (Fe) deposition from aeolian dusts into the remote oceans and the role it plays as a key nutrient for photosynthesis in marine phytoplankton in high nutrient low chlorophyll (HNLC) waters. Several in situ iron fertilization studies in HNLC regions have reported increases in chlorophyll a concentrations, nutrient and carbon uptake, and the release of various biogenic gases which have the potential to directly and indirectly impact global climate. Of particular interest in the present study is the indirect effect of dimethyl sulfoxide (DMSO) as part of a positive feedback cycle that may exist between such biogenically derived reduced sulfur compounds and crustal derived iron in the atmosphere over remote oceanic regions. To determine whether DMSO can lead to larger atmospheric concentrations of bioavailable iron in the form of Fe(II), photochemical simulation experiments were carried out using synthetic ferrihydrite (Fe5HO8ṡ4H2O) in the presence of DMSO. During these experiments DMSO oxidation products, such as methane sulfonic acid (MSA), methane sulfinic acid (MSIA), and sulfate (SO42-), were quantified by means of ion chromatography (IC), while Fe(II) was determined spectrophotometrically by complexation with ferrozine. Preliminary results suggest that current ambient DMSO levels are too low to play a significant role in the reductive dissolution of iron hydroxide in aerosol particles. However, increased DMSO levels may enhance bioavailability of iron, thus potentially closing the gap in the positive feedback cycle.

  13. Solvent stimulated actuation of polyurethane-based shape memory polymer foams using dimethyl sulfoxide and ethanol

    Boyle, A. J.; Weems, A. C.; Hasan, S. M.; Nash, L. D.; Monroe, M. B. B.; Maitland, D. J.


    Solvent exposure has been investigated to trigger actuation of shape memory polymers (SMPs) as an alternative to direct heating. This study aimed to investigate the feasibility of using dimethyl sulfoxide (DMSO) and ethanol (EtOH) to stimulate polyurethane-based SMP foam actuation and the required solvent concentrations in water for rapid actuation of hydrophobic SMP foams. SMP foams exhibited decreased T g when submerged in DMSO and EtOH when compared to water submersion. Kinetic DMA experiments showed minimal or no relaxation for all SMP foams in water within 30 min, while SMP foams submerged in EtOH exhibited rapid relaxation within 1 min of submersion. SMP foams expanded rapidly in high concentrations of DMSO and EtOH solutions, where complete recovery over 30 min was observed in DMSO concentrations greater than 90% and in EtOH concentrations greater than 20%. This study demonstrates that both DMSO and EtOH are effective at triggering volume recovery of polyurethane-based SMP foams, including in aqueous environments, and provides promise for use of this actuation technique in various applications.

  14. Increased methionine sulfoxide content of apoA-I in type 1 diabetes.

    Brock, Jonathan W C; Jenkins, Alicia J; Lyons, Timothy J; Klein, Richard L; Yim, Eunsil; Lopes-Virella, Maria; Carter, Rickey E; Thorpe, Suzanne R; Baynes, John W


    Cardiovascular disease is a major cause of morbidity and premature mortality in diabetes. HDL plays an important role in limiting vascular damage by removing cholesterol and cholesteryl ester hydroperoxides from oxidized low density lipoprotein and foam cells. Methionine (Met) residues in apolipoprotein A-I (apoA-I), the major apolipoprotein of HDL, reduce peroxides in HDL lipids, forming methionine sulfoxide [Met(O)]. We examined the extent and sites of Met(O) formation in apoA-I of HDL isolated from plasma of healthy control and type 1 diabetic subjects to assess apoA-I exposure to lipid peroxides and the status of oxidative stress in the vascular compartment in diabetes. Three tryptic peptides of apoA-I contain Met residues: Q(84)-M(86)-K(88), W(108)-M(112)-R(116), and L(144)-M(148)-R(149). These peptides and their Met(O) analogs were identified and quantified by mass spectrometry. Relative to controls, Met(O) formation was significantly increased at all three locations (Met(86), Met(112), and Met(148)) in diabetic patients. The increase in Met(O) in the diabetic group did not correlate with other biomarkers of oxidative stress, such as N(epsilon)-malondialdehyde-lysine or N(epsilon)-(carboxymethyl)lysine, in plasma or lipoproteins. The higher Met(O) content in apoA-I from diabetic patients is consistent with increased levels of lipid peroxidation products in plasma in diabetes. Using the methods developed here, future studies can address the relationship between Met(O) in apoA-I and the risk, development, or progression of the vascular complications of diabetes.

  15. Dimethyl Sulfoxide Attenuates Acute Lung Injury Induced by Hemorrhagic Shock/Resuscitation in Rats.

    Tsung, Yu-Chi; Chung, Chih-Yang; Wan, Hung-Chieh; Chang, Ya-Ying; Shih, Ping-Cheng; Hsu, Han-Shui; Kao, Ming-Chang; Huang, Chun-Jen


    Inflammation following hemorrhagic shock/resuscitation (HS/RES) induces acute lung injury (ALI). Dimethyl sulfoxide (DMSO) possesses anti-inflammatory and antioxidative capacities. We sought to clarify whether DMSO could attenuate ALI induced by HS/RES. Male Sprague-Dawley rats were allocated to receive either a sham operation, sham plus DMSO, HS/RES, or HS/RES plus DMSO, and these were denoted as the Sham, Sham + DMSO, HS/RES, or HS/RES + DMSO group, respectively (n = 12 in each group). HS/RES was achieved by drawing blood to lower mean arterial pressure (40-45 mmHg for 60 min) followed by reinfusion with shed blood/saline mixtures. All rats received an intravenous injection of normal saline or DMSO immediately before resuscitation or at matching points relative to the sham groups. Arterial blood gas and histological assays (including histopathology, neutrophil infiltration, and lung water content) confirmed that HS/RES induced ALI. Significant increases in pulmonary expression of tumor necrosis factor-α (TNF-α), malondialdehyde, nuclear factor-kappa B (NF-κB), inducible nitric oxide synthase (iNOS), and cyclooxygenase 2 (COX-2) confirmed that HS/RES induced pulmonary inflammation and oxidative stress. DMSO significantly attenuated the pulmonary inflammation and ALI induced by HS/RES. The mechanisms for this may involve reducing inflammation and oxidative stress through inhibition of pulmonary NF-κB, TNF-α, iNOS, and COX-2 expression.

  16. Diverse effects of dimethyl sulfoxide (DMSO) on the differentiation potential of human embryonic stem cells.

    Pal, Rajarshi; Mamidi, Murali Krishna; Das, Anjan Kumar; Bhonde, Ramesh


    In vitro disease modeling using pluripotent stem cells can be a fast track screening tool for toxicological testing of candidate drug molecules. Dimethyl sulfoxide (DMSO) is one of the most commonly used solvents in drug screening. In the present investigation, we exposed 14- to 21-day-old embryoid bodies (EBs) to three different concentrations of DMSO [0.01% (low dose), 0.1% (medium dose) and 1.0% (high dose)] to identify the safest dose that could effectively be used as solvent. We found that DMSO treatment substantially altered the morphology and attachment of cells in concurrence with a significant reduction in cell viability in a dose-dependent manner. Gene expression studies revealed a selective downregulation of key markers associated with stemness (Oct-4, Sox-2, Nanog and Rex-1); ectoderm (Nestin, TuJ1, NEFH and Keratin-15); mesoderm (HAND-1, MEF-2C, GATA-4 and cardiac-actin); and endoderm (SOX-17, HNF-3β, GATA-6 and albumin), indicating an aberrant and untimely differentiation trajectory. Furthermore, immunocytochemistry, flow cytometry and histological analyses demonstrated substantial decrease in the levels of albumin and CK-18 proteins coupled with a massive reduction in the number of cells positive for PAS staining, implicating reduced deposits of glycogen. Our study advocates for the first time that DMSO exposure not only affects the phenotypic characteristics but also induces significant alteration in gene expression, protein content and functionality of the differentiated hepatic cells. Overall, our experiments warrant that hESC-based assays can provide timely alerts about the outcome of widespread applications of DMSO as drug solvent, cryoprotectant and differentiating agent.

  17. 5% dimethyl sulfoxide (DMSO) and pentastarch improves cryopreservation of cord blood cells over 10% DMSO.

    Hayakawa, Jun; Joyal, Elizabeth G; Gildner, Jean F; Washington, Kareem N; Phang, Oswald A; Uchida, Naoya; Hsieh, Matthew M; Tisdale, John F


    Cell number and viability are important in cord blood (CB) transplantation. While 10% dimethyl sulfoxide (DMSO) is the standard medium, adding a starch to freezing medium is increasingly utilized as a cytoprotectant for the thawing process. Similar to hetastarch, pentastarch has the advantages of faster renal clearance and less effect on the coagulation system. We compared a lower DMSO concentration (5%) containing pentastarch with 10% DMSO and performed cell viability assay, colony-forming units (CFUs), and transplantation of CB cells in NOD/SCID IL2Rγ(null) mice. CB cells in 5% DMSO/pentastarch had similar CD34+, CD3+, and CD19+ cell percentages after thawing as fresh CB cells. CB cells in 5% DMSO/pentastarch had higher viability (83.3±9.23%) than those frozen in 10% DMSO (75.3±11.0%, pDMSO/pentastarch group. At the end of 3 hours, the viability decreased by a mean of 7.75% for the 5% DMSO/pentastarch and 17.5% for the 10% DMSO groups. CFUs were similar between the two cryopreserved groups. Frozen CB cells engrafted equally well in IL2Rγ(null) mice compared to fresh CB cells up to 24 weeks, and CB cells frozen in 5% DMSO/pentastarch engrafted better than those in 10% DMSO. Our data indicate that the lower DMSO concentration with pentastarch represents an improvement in the CB cryopreservation process and could have wider clinical application as an alternate freezing medium over 10% DMSO. © 2010 American Association of Blood Banks.

  18. Inhibition of differentiation and function of osteoclasts by dimethyl sulfoxide (DMSO).

    Yang, Chunxi; Madhu, Vedavathi; Thomas, Candace; Yang, Xinlin; Du, Xeujun; Dighe, Abhijit S; Cui, Quanjun


    Dimethyl sulfoxide (DMSO) is an FDA-approved organosulfur solvent that is reported to have therapeutic value in osteoarthritis and osteopenia. DMSO is used as a cryoprotectant for the cryopreservation of bone grafts and mesenchymal stem cells which are later used for bone repair. It is also used as a solvent in the preparation of various scaffolds used for bone tissue engineering purposes. DMSO has been reported to inhibit osteoclast formation in vitro but the mechanism involved has remained elusive. We investigated the effect of DMSO on osteoclast differentiation and function using a conventional model system of RAW 264.7 cells. The differentiation of RAW 264.7 cells was induced by adding 50 ng/ml RANKL and the effect of DMSO (0.01 and 1% v/v) on RANKL-induced osteoclastogenesis was investigated. Addition of 1% DMSO significantly inhibited RANKL-induced formation of TRAP+, multinucleated, mature osteoclasts and osteoclast late-stage precursors (c-Kit(-) c-Fms(+) Mac-1(+) RANK(+)). While DMSO did not inhibit proliferation per se, it did inhibit the effect of RANKL on proliferation of RAW 264.7 cells. Key genes related to osteoclast function (TRAP, Integrin αVβ3, Cathepsin K and MMP9) were significantly down-regulated by DMSO. RANKL-induced expression of RANK gene was significantly reduced in the presence of DMSO. Our data, and reports from other investigators, that DMSO enhances osteoblastic differentiation of mesenchymal stem cells and also prevents bone loss in ovarietcomized rats, suggest that DMSO has tremendous potential in the treatment of osteoporosis and bone diseases arising from uncontrolled activities of the osteoclasts.

  19. Microinjection of the vehicle dimethyl sulfoxide (DMSO) into the periaqueductal gray modulates morphine antinociception.

    Fossum, Erin N; Lisowski, Mark J; Macey, Tara A; Ingram, Susan L; Morgan, Michael M


    Dimethyl sulfoxide (DMSO) is commonly used as a solvent for water-insoluble drugs. Given that DMSO has varying cellular and behavioral effects ranging from increased membrane permeability to toxicity, microinjection of DMSO as a vehicle could confound the effects of other drugs. For example, DMSO is often used as a vehicle for studies examining the neurochemical mechanisms underlying morphine antinociception. Given that the ventrolateral periaqueductal gray (vlPAG) plays a major role in morphine antinociception and tolerance, the effects of DMSO on morphine antinociception mediated by the vlPAG needs to be evaluated. The present experiment tested whether co-administration of DMSO (0, 0.2, 2, or 20%) would alter the antinociceptive effect of microinjecting morphine into the vlPAG. DMSO had no effect on nociception when microinjected into the vlPAG alone, but 2% DMSO enhanced morphine potency when co-administered with morphine. In contrast, twice daily microinjections of DMSO (5 or 20%) for two days reduced the potency of subsequent microinjections of morphine into the vlPAG--an effect that persisted for at least one week. A similar rightward shift in the morphine dose-response curve was caused by morphine tolerance. Co-administration of morphine and DMSO during the pretreatment did not cause a greater shift in the morphine dose-response curve compared to morphine pretreated alone. In conclusion, DMSO can alter morphine antinociception following both acute (enhancement) and chronic (inhibition) administration depending on the concentration. These data reinforce the need to be cautious when using DMSO as a vehicle for drug administration.

  20. Dimethyl sulfoxide (DMSO) as a potential contrast agent for brain tumors.

    Delgado-Goñi, T; Martín-Sitjar, J; Simões, R V; Acosta, M; Lope-Piedrafita, S; Arús, C


    Dimethyl sulfoxide (DMSO) is commonly used in preclinical studies of animal models of high-grade glioma as a solvent for chemotherapeutic agents. A strong DMSO signal was detected by single-voxel MRS in the brain of three C57BL/6 control mice during a pilot study of DMSO tolerance after intragastric administration. This led us to investigate the accumulation and wash-out kinetics of DMSO in both normal brain parenchyma (n=3 control mice) by single-voxel MRS, and in 12 GL261 glioblastomas (GBMs) by single-voxel MRS (n=3) and MRSI (n=9). DMSO accumulated differently in each tissue type, reaching its highest concentration in tumors: 6.18 ± 0.85 µmol/g water, 1.5-fold higher than in control mouse brain (pDMSO changes revealed clear hotspots of differential spatial accumulation in GL261 tumors. Additional MRSI studies with four mice bearing oligodendrogliomas (ODs) revealed similar results as in GBM tumors. The lack of T(1) contrast enhancement post-gadolinium (gadopentetate dimeglumine, Gd-DTPA) in control mouse brain and mice with ODs suggested that DMSO was fully able to cross the intact blood-brain barrier in both normal brain parenchyma and in low-grade tumors. Our results indicate a potential role for DMSO as a contrast agent for brain tumor detection, even in those tumors 'invisible' to standard gadolinium-enhanced MRI, and possibly for monitoring heterogeneities associated with progression or with therapeutic response. Copyright © 2012 John Wiley & Sons, Ltd.

  1. Dimethyl Sulfoxide Is Feasible for Plant Tubulin Assembly In vitro: A Comprehensive Analysis

    Chun-Hua XU; Shan-Jin HUANG; Ming YUAN


    It is much more difficult for tubulin from plant sources to polymerize in vitro than tubulin from animal sources. Taxol, a most widely used reagent in microtubule studies, enhances plant microtubule assembly, but hinders microtubule dynamics. Dimethyl sulfoxide (DMSO), a widely used reagent in animal microtubule studies, is a good candidate for the investigation of plant microtubule assembly in vitro.However, proper investigation is lacking about the effects of DMSO on plant microtubule assembly in vitro.In the present study, DMSO was used to establish optimal conditions for the polymerization of plant tubulin. Tubulin, purified from lily pollen, polymerizes into microtubules at a critical concentration of 1.2mg/mL in the presence of 10% DMSO. The polymers appear to have a normal microtubule structure, as revealed by electron microscopy. In the presence of 10% DMSO, microtubule polymerization decreases when the pH of the medium is increased from 6.5 to 7.4. Both the polymerization rate and the mass of the polymers increase as temperature increases from 25 to 40 ℃. Tubulin polymerizes and depolymerizes along with cycling of temperature, from 37 to 4 ℃, or following the addition to or the removal of Ca2+ from the medium. When incubated with nuclei isolated from tobacco BY-2 suspension cells, tubulin assembles onto the nuclear surface in the presence of 10% DMSO. Labeling lily pollen tubulin with 5- (and 6-)carboxytetramethyl-rhodamine succinimidyl ester (NHS-rhodamine) was performed successfully in the presence of 10% DMSO. Labeled tubulin assembles into a radial structure on the surface of BY-2 nuclei. The polymerization of lily pollen tubulin is also enhanced by microtubule-associated proteins from animal sources in the presence of 10% DMSO. All the experimental results indicate that plant tubulin functions normally in the presence of DMSO. Therefore, DMSO is an appropriate reagent for plant tubulin polymerization and investigation of plant microtubules in

  2. Hydrogen-bonding interactions between [BMIM][BF4] and dimethyl sulfoxide

    Zheng, Yan-Zhen; He, Hong-Yan; Zhou, Yu; Yu, Zhi-Wu


    Mixtures of Ionic liquids and small polar organic solvent are potential green solvents for cellulose dissolution under mild conditions. In this work, the interactions between a representative imidazolium-based ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) and dimethyl sulfoxide (DMSO) were investigated in detail by attenuated total reflection infrared spectroscopy (ATR-IR) and density functional theory calculations (DFT). The main conclusions are: (1) C2-H is the main interaction site in forming cation-anion, cation-DMSO, and [BMIM][BF4]-DMSO complexes. (2) The two turning points of the wavenumber shift changes of C2-H may indicate that the dilution process can be divided into several stages: from larger ion clusters to smaller ion clusters, then to ion pairs, and finally to individual ions. The solvent molecules cannot break apart the strong Coulombic interaction between [BMIM]+ and [BF4]- but can break apart the ion clusters into ion pairs when the mole fraction of DMSO is less than 0.9. When the mole fraction of DMSO is greater than 0.9, ion pairs can be broke into ions. (3) The hydrogen-bonds of the aromatic C-Hs in [BMIM]+ are strengthened in the dilution process while those of the alkyl C-Hs of [BMIM]+ are weakened. (4) The aromatic C-Hs of the [BMIM]+ cation strength before the weakening of the alkyl C-Hs. These in-depth studies on the properties of the ionic liquid-DMSO mixed solvents may shed light on exploring their applications as mixed solvents in cellulose dissolution and other practices.

  3. Dielectric Relaxation in Dimethyl Sulfoxide/Water Mixtures Studied by Microwave Dielectric Relaxation Spectroscopy

    Lu, Zijie; Manias, Evangelos; MacDonald, Digby D.; Lanagan, Michael


    Dielectric spectra of dimethyl sulfoxide (DMSO)/water mixtures, over the entire concentration range, have been measured using the transmission line method at frequencies from 45 MHz to 26 GHz and at temperatures of 298-318 K. The relaxation times of the mixtures show a maximum at an intermediate molar fraction of DMSO. The specific structure of mixtures in different concentration regions was determined by the dielectric relaxation dynamics, obtained from the effect of temperature on the relaxation time. A water structure "breaking effect" is observed in dilute aqueous solutions. The average number of hydrogen bonds per water molecule in these mixtures is found to be reduced compared to pure water. The increase in the dielectric relaxation time in DMSO/water mixtures is attributed to the spatial (steric) constraints of DMSO molecules on the hydrogen-bond network, rather than being due to hydrophobic hydration of the methyl groups. The interaction between water and DMSO by hydrogen bonding reaches a maximum at a DMSO molar fraction of 0.33, reflected by the maximum activation enthalpy for dielectric relaxation in this concentration, suggesting the formation of a stoichiometric compound, H2O-DMSO-H2O. In highly concentrated solutions, negative activation entropies are observed, indicating the presence of aggregates of DMSO molecules. A distinct antiparallel arrangement of dipoles is obtained for neat DMSO in the liquid state according to the Kirkwood correlation factor (gK = 0.5), calculated from the static permittivity. The similarity of the dielectric behavior of pure DMSO and DMSO-rich mixtures suggests that dipole-dipole interactions contribute significantly to the rotational relaxation process in these solutions.

  4. Thermodynamic and Spectroscopic Studies of Lanthanides(III) Complexation with Polyamines in Dimethyl Sulfoxide

    Di Bernardo, Plinio [Univ. of Padova (Italy); Zanonato, Pier Luigi [Univ. of Padova (Italy); Melchior, Andrea [Univ. of Udine (Italy); Portanova, Roberto [Univ. of Udine (Italy); Tolazzi, Marilena [Univ. of Udine (Italy); Choppin, Gregory R. [Florida State Univ., Tallahassee, FL (United States); Wang, Zheming [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)


    The thermodynamic parameters of complexation of Ln(III) cations with tris(2-aminoethyl)amine (tren) and tetraethylenepentamine (tetren) were determined in dimethyl sulfoxide (DMSO) by potentiometry and calorimetry. The excitation and emission spectra and luminescence decay constants of Eu3+ and Tb3+ complexed by tren and tetren, as well as those of the same lanthanides(III) complexed with diethylenetriamine (dien) and triethylenetetramine (trien), were also obtained in the same solvent. The combination of thermodynamic and spectroscopic data showed that, in the 1:1 complexes, all nitrogens of the ligands bound to the lanthanides except in the case of tren, in which only pendant N bound. For the larger ligands (trien, tren, tetren) in the higher complexes (ML2), there was less complete binding by available donors, presumably due to steric crowding. FT-IR studies were carried out in an acetonitrile/DMSO mixture, suitably chosen in order to follow the changes in the primary solvation sphere of lanthanide(III) due to complexation of amine ligands. Results show that the mean number of molecules of DMSO removed from the inner coordination sphere of lanthanides(III) is lower than ligand denticity and that the coordination number of the metal ions increases with amine complexation from ~8 to ~10. Independently of the number and structure of the amines, linear trends, similar for all lanthanides, were obtained by plotting the values of ΔGj°, ΔHj° and TΔSj° for the complexation of ethylenediamine (en), dien, trien, tren and tetren as a function of the number of amine metal-coordinated nitrogen atoms. The main factors on which the thermodynamic functions of lanthanide(III) complexation reactions in DMSO depend are discussed.

  5. S-alk(en)yl-L-cysteine sulfoxides and relative pungency measurements of photosynthetic and nonphotosynthetic tissues of Allium porrum.

    Doran, James A; O'Donnell, Jennifer S; Lairson, Luke L; McDonald, Mary Ruth; Schwan, Adrian L; Grodzinski, Bernard


    Three standard assays for pyruvate gave equivalent measurements of relative pungency for two leek cultivars ( 'Tadorna' and 'Ramona'). Background pyruvate levels varied depending on the assay used, ranging from 0.4 (lactate dehydrogenase) to 1.5 (high-performance liquid chromatography, HPLC) micromol g(-1) fresh weight (FW) on average. The relative pungencies of the two leek cultivars were also compared to total concentrations of the S-alk(en)yl-L-cysteine sulfoxides (RCSOs). The average ratio of EPy to total RCSOs was 10.9, indicating that standard pungency assays underestimate the levels of RCSOs in the tissue. A detailed analysis of 'Tadorna' leaves showed that total RCSO concentrations decreased acropetally. Profiles were composed of (-/+)-methyl-, (-/+)-ethyl-, (+)-propyl-, and (+)-1-propenyl-L-cysteine sulfoxide (MCSO, ECSO, PCSO, and 1-PeCSO, respectively). (+)-PCSO was the most prominent in green (2.4 mg g (-1) FW), yellow (5.5 mg g (-1) FW), and white (3.8 mg g (-1) FW) tissues. The prop(en)yl-L-cysteine sulfoxide derivatives were dominant in tissues that had photosynthetic capacity. The (+)-MCSO levels were high in the bulb (3.6 mg g (-1) FW). Interestingly, detectable levels of (-/+)-ECSO were measured in the leaves ( approximately 0.5 mg g (-1) FW). RCSO profiles of the different tissue regions were similar, but more (+)-PCSO and (+)-1-PeCSO were detected in the bulb. In general, mature upper leaf tissues had lower levels of total RCSOs. Overall, mild extraction methods and a low-temperature HPLC protocol (preferably with long retention times) achieved adequate compound separation and resolution of the diastereomers.

  6. Diastereoselective Addition of α-Metalated Sulfoxides to Imines Revisited: Mechanism, Computational Studies, and the Effect of External Chiral Ligands

    Pedersen, Brian; Rein, Tobias; Søtofte, Inger


    six-membered "flat chair") was probed by quantum mechanical calculations, which underpinned the idea of using external chiral ligands to enhance the diastereoselectivity of otherwise moderately selective reactions. In this way, the diastereomeric ratio of the product 3a could be raised from (84 : 16......Some new results on asymmetric synthesis via the addition of a-metalated methyl tolyl sulfoxides to imines are presented. Good diastereoselectivity (up to > 98% d.e. for product 3g) can be obtained under conditions of kinetic control (short reaction time, low temperature). The transition state (a...

  7. Chlorido(dimethyl sulfoxide(pyridine-2-thiolato N-oxide-κ2S,Oplatinum(II

    Dieter Schollmeyer


    Full Text Available The asymmetric unit of the title compound, [Pt(C5H4NOSCl(C2H6OS], contains two independent complex molecules having similar geometries. Each PtII atom is four-coordinated in a distorted square-planar geometry by S and O atoms of one pyridine N-oxide ligand, the S atom of one dimethyl sulfoxide molecule and one terminal Cl− ion. The molecules are linked into a three-dimensional framework by C—H...O and C—H...Cl hydrogen bonds.

  8. Population and relaxation kinetics of laser-excitated photofunctional ruthenium-sulfoxide complexes in highly concentrated solutions; Populations- und Relaxationskinetiken laserangeregter photofunktionaler Ruthenium-Sulfoxid-Komplexe in hochkonzentrierten Loesungen

    Eicke, Sebastian


    Photofunctionality of ruthenium sulfoxide complexes offer a distinct photochromy, which results from their light-induced binding isomerization. By this the complexes are suited for the usage in photonic applications like fast optical switches or optical data memories. The present thesis studies the photofunctionality of the complexes by means of laser-excited population and thermally activated relaxation kinetics. In view to photonic applications thereby exclusively highly concentrated sample solutions are considered, which exhibit beside a distinct photochromy a just remarkable photosensitivity. The photochromic kinetics usable in an application are described by means of a model and rate equations, so that a statement on an optimal sample-solution concentration in connection of drived and driving light beam can be met. By means of the characteristics of the photochromic kinetics complex properties, like for instance the thermal stability of the metastable isomers, can be defined. The applicative suitability of the photofunctional ruthenium sulfoxide complexes is finally shown by the selective fitting of their complex properties by diverse structural and environmental modifications.

  9. Freezing of Apheresis Platelet Concentrates in 6% Dimethyl Sulfoxide: The First Preliminary Study in Turkey

    Soner Yılmaz


    Full Text Available Objective: Transfusion of platelet suspensions is an essential part of patient care for certain clinical indications. In this pioneering study in Turkey, we aimed to assess the in vitro hemostatic functions of platelets after cryopreservation. Materials and Methods: Seven units of platelet concentrates were obtained by apheresis. Each apheresis platelet concentrate (APC was divided into 2 equal volumes and frozen with 6% dimethyl sulfoxide (DMSO. The 14 frozen units of APCs were kept at -80 °C for 1 day. APCs were thawed at 37 °C and diluted either with autologous plasma or 0.9% NaCl. The volume and residual numbers of leukocytes and platelets were tested in both before-freezing and post-thawing periods. Aggregation and thrombin generation tests were used to analyze the in vitro hemostatic functions of platelets. Flow-cytometric analysis was used to assess the presence of frozen treated platelets and their viability. Results: The residual number of leukocytes in both dilution groups was <1x106. The mean platelet recovery rate in the plasma-diluted group (88.1±9.5% was higher than that in the 0.9% NaCl-diluted group (63±10%. These results were compatible with the European Directorate for the Quality of Medicines quality criteria. Expectedly, there was no aggregation response to platelet aggregation test. The mean thrombin generation potential of postthaw APCs was higher in the plasma-diluted group (2411 nmol/L per minute when compared to both the 0.9% NaCl-diluted group (1913 nmol/L per minute and the before-freezing period (1681 nmol/L per minute. The flowcytometric analysis results for the viability of APCs after cryopreservation were 94.9% and 96.6% in the plasma and 0.9% NaCl groups, respectively. Conclusion: Cryopreservation of platelets with 6% DMSO and storage at -80 °C increases their shelf life from 7 days to 2 years. Besides the increase in hemostatic functions of platelets, the cryopreservation process also does not affect their

  10. The differentiation inducer, dimethyl sulfoxide, transiently increases the intracellular calcium ion concentration in various cell types.

    Morley, P; Whitfield, J F


    Dimethyl sulfoxide (DMSO) initiates a coordinated differentiation program in various cell types but the mechanism(s) by which DMSO does this is not understood. In this study, the effect of DMSO on intracellular calcium ion concentration ([Ca2+]i) was determined in primary cultures of chicken ovarian granulosa cells from the two largest preovulatory follicles of laying hens, and in three cell lines: undifferentiated P19 embryonal carcinoma cells, 3T3-L1 fibroblasts, and Friend murine erythroleukemia (MEL) cells. [Ca2+]i was measured in cells loaded with the Ca(2+)-specific fluoroprobe Fura-2. There was an immediate (i.e., within 5 sec), transient, two to sixfold increase in [Ca2+]i after exposing all cell types to 1% DMSO. DMSO was effective between 0.2 and 1%. The prompt DMSO-induced [Ca2+]i spike in all of the cell types was not prevented by incubating the cells in Ca(2+)-free medium containing 2 mM EGTA or by pretreating them with the Ca(2+)-channel blockers methoxyverapamil (D600; 100 microM), nifedipine (20 microM), or cobalt (5 mM). However, when granulosa cells, 3T3-L1 cells, or MEL cells were pretreated with lanthanum (La3+; 1 mM), which blocks both Ca2+ channels and membrane Ca2+ pumps, there was a sustained increase in [Ca2+]i in response to 1% DMSO. By contrast, pretreating P19 cells with La3+ (1 mM) did not prolong the DMSO-triggered [Ca2+]i transient. In all cases, the DMSO-induced [Ca2+]i surge was unaffected by pretreating the cells with the inhibitors of inositol phospholipid hydrolysis, neomycin (1.5 mM) or U-73, 122 (2.5 microM). These results suggest that DMSO almost instantaneously triggers the release of Ca2+ from intracellular stores through a common mechanism in cells in primary cultures and in cells of a variety of established lines, but this release is not mediated through phosphoinositide breakdown. This large, DMSO-induced Ca2+ spike may play a role in the induction of cell differentiation by DMSO.

  11. Preparation of tri- and difluoromethylsilanes via an unusual magnesium metal-mediated reductive tri- and difluoromethylation of chlorosilanes using tri- and difluoromethyl sulfides, sulfoxides, and sulfones.

    Prakash, G K Surya; Hu, Jinbo; Olah, George A


    A new and efficient method for the preparation of tri- and difluoromethylsilanes using magnesium metal-mediated reductive tri- and difluoromethylation of chlorosilanes is reported using tri- and difluoromethyl sulfides, sulfoxides, and sulfones. The byproduct of the process is diphenyl disulfide. Since phenyl trifluoromethyl sulfone, sulfoxide, and sulfide are readily prepared from trifluoromethane (CF(3)H) and diphenyl disulfide, the method can be considered to be catalytic in diphenyl disulfide for the preparation of (trifluoromethyl)trimethylsilane (TMS-CF(3)) from non-ozone-depleting trifluoromethane.

  12. Characterization of a methionine sulfoxide reductase B from tomato (Solanum lycopersicum), and its protecting role in Saccharomyces cerevisiae.

    Dai, Changbo; Liu, Likun; Wang, Myeong Hyeon


    In the present study, we isolated a methionine sulfoxide reductase B gene, termed SlMSRB1, from tomato (Solanum lycopersicum). In the organ-specific analysis, high expression levels of SlMSRB1 were detected in red mature fruits, leaves and flowers while low transcriptional levels of SlMSRB1 mRNA were observed in stems and roots. In the green fluorescence analysis of SlMSRB1- overexpressed Arabidopsis, signal corresponding to SlMSRB1 was merely detected in chloroplast, suggesting that tomato MSRB1 is a chloroplastial localization protein. Substrate specificity analysis of recombinant SlMSRB1 showed that the enzyme was only targeted to the R epimer of methionine sulfoxide (MetSO) and was able to convert both free and protein-bound MetSO back to methionine in the presence of dithithreitol (DTT). In addition, SlMSRB1 exhibited no activity in thioredoxin dependent system or the substitution of cysteine at position 181 in the DTT-dependent reduction system. Finally, overexpression of SlMSRB1 in yeast revealed that the SlMSRB1 gene might play a critical role in protecting Saccharomyces cerevisiae against oxidative stress.

  13. Molecular characterization and expression profile of methionine sulfoxide reductase gene family in maize (Zea mays) under abiotic stresses.

    Zhu, Jiantang; Ding, Pengcheng; Li, Qingqing; Gao, YanKun; Chen, Fanguo; Xia, Guangmin


    Methionine (Met) oxidation to methionine sulfoxide (MetSO) is a common form of damage caused by reactive oxygen species (ROS) accumulation via various environmental stresses. Methionine sulfoxide reductase (MSR) repairs oxidized Met and protects organisms from oxidative damage. Two types of MSR, A and B, have been identified based on substrate stereo specificity; they share no sequence similarity. In the present study, we characterized six genes encoding the putative MSR from two public databases. We compared them with MSRs from 6 species, and evaluated molecular characterization, phylogenetic analysis, tertiary structure and conserved motifs. On the basis of in silico and the qRT-PCR experimental data, we analyzed cDNA sequences and expression patterns of ZmMSR genes in different organs in maize. We found that ZmMSR genes were induced by polyethylene glycol (PEG) and NaCl, both known to generate oxidative stress. The results show that MSRs are conserved in different species, suggesting that MSRs across different species share common mechanisms related to diverse defense responses.

  14. Mutant form C115H of Clostridium sporogenes methionine γ-lyase efficiently cleaves S-Alk(en)yl-l-cysteine sulfoxides to antibacterial thiosulfinates.

    Kulikova, Vitalia V; Anufrieva, Natalya V; Revtovich, Svetlana V; Chernov, Alexander S; Telegin, Georgii B; Morozova, Elena A; Demidkina, Tatyana V


    Pyridoxal 5'-phosphate-dependent methionine γ-lyase (MGL) catalyzes the β-elimination reaction of S-alk(en)yl-l-cysteine sulfoxides to thiosulfinates, which possess antimicrobial activity. Partial inactivation of the enzyme in the course of the reaction occurs due to oxidation of active site cysteine 115 conserved in bacterial MGLs. In this work, the C115H mutant form of Clostridium sporogenes MGL was prepared and the steady-state kinetic parameters of the enzyme were determined. The substitution results in an increase in the catalytic efficiency of the mutant form towards S-substituted l-cysteine sulfoxides compared to the wild type enzyme. We used a sulfoxide/enzyme system to generate antibacterial activity in situ. Two-component systems composed of the mutant enzyme and three S-substituted l-cysteine sulfoxides were demonstrated to be effective against Gram-positive and Gram-negative bacteria and three clinical isolates from mice. © 2016 IUBMB Life, 68(10):830-835, 2016.

  15. A simple LC-MS/MS method to determine plasma and cerebrospinal fluid levels of albendazole metabolites (albendazole sulfoxide and albendazole sulfone) in patients with neurocysticercosis.

    González-Hernández, Iliana; Ruiz-Olmedo, María Isabel; Cárdenas, Graciela; Jung-Cook, Helgi


    The development and validation of an LC-MS/MS method for the simultaneous determination of albendazole metabolites (albendazole sulfoxide and albendazole sulfone) in human plasma are described. Samples of 200 μL were extracted with ether-dichloromethane-chloroform (60:30:10, v/v/v). The chromatographic separation was performed using a C(18) column with methanol-formic acid 20 mmol/L (70:30) as the mobile phase. The method was linear in a range of 20-5000 ng/mL for albendazole sulfoxide and 10-1500 ng/mL for albendazole sulfone. For both analytes the method was precise (RSD 90%). The method was successfully applied to determine the plasma and cerebrospinal fluid levels of albendazole sulfoxide and albendazole sulfone in patients with subarachnoidal neurocysticercosis who received albendazole at 30 mg/kg per day for 7 days. This LC-MS/MS method yielded a quick, simple and reliable protocol for determining albendazole sulfoxide and albendazole sulfone concentrations in plasma and cerebrospinal fluid samples and is applicable to therapeutic monitoring.

  16. Molybdatophosphoric acid as an efficient catalyst for the catalytic and chemoselective oxidation of sulfides to sulfoxides using urea hydrogen peroxide as a commercially available oxidant



    Full Text Available An efficient procedure for the chemoselective oxidation of alkyl (aryl sulfides to the corresponding sulfoxides using urea hydrogen peroxide (UHP in the presence of a catalytic amount of molybdatophosphoric acid at room temperature is described. The advantages of described method are: generality, high yield and chemoselectivity, short reaction time, low cost and compliment with green chemistry protocols.

  17. Experimental design-guided development of a stereospecific capillary electrophoresis assay for methionine sulfoxide reductase enzymes using a diastereomeric pentapeptide substrate.

    Zhu, Qingfu; Huo, Xingyu; Heinemann, Stefan H; Schönherr, Roland; El-Mergawy, Rabab; Scriba, Gerhard K E


    A capillary electrophoresis method has been developed and validated to evaluate the stereospecific activity of recombinant human methionine sulfoxide reductase enzymes employing the C-terminally dinitrophenyl-labeled N-acetylated pentapeptide ac-KIFM(O)K-Dnp as substrate (M(O)=methionine sulfoxide). The separation of the ac-KIFM(O)K-Dnp diastereomers and the reduced peptide ac-KIFMK-Dnp was optimized using experimental design with regard to the buffer pH, buffer concentration, sulfated β-cyclodextrin and 15-crown-5 concentration as well as capillary temperature and separation voltage. A fractional factorial response IV design was employed for the identification of the significant factors and a five-level circumscribed central composite design for the final method optimization. Resolution of the peptide diastereomers as well as analyte migration time served as responses in both designs. The resulting optimized conditions included 50mM Tris buffer, pH 7.85, containing 5mM 15-crown-5 and 14.3mg/mL sulfated β-cyclodextrin, at an applied voltage of 25kV and a capillary temperature of 21.5°C. The assay was subsequently applied to the determination of the stereospecificity of recombinant human methionine sulfoxide reductases A and B2. The Michaelis-Menten kinetic data were determined. The pentapeptide proved to be a good substrate for both enzymes. Furthermore, the first separation of methionine sulfoxide peptide diastereomers is reported.

  18. Effects of dimethyl sulfoxide on the hydrogen bonding structure and dynamics of aqueous N-methylacetamide solution



    Effects of dimethyl-sulfoxide (DMSO) on the hydrogen bonding structure and dynamics in aqueousN-methylacetamide (NMA) solution are investigated by classical molecular dynamics simulations. Themodifications of structure and interaction between water and NMA in presence of DMSO molecules are calculatedby various site-site radial distribution functions and average interaction energies between these speciesin the solution. It is observed that the aqueous peptide hydrogen bond interaction is relatively stronger withincreasing concentration of DMSO, whereas methyl-methyl interaction between NMA and DMSO decreasessignificantly. The DMSO molecule prefers to interact with amide-hydrogen of NMA even at lower DMSO concentration.The lifetimes and structural-relaxation times of NMA-water, water-water and DMSO-water hydrogenbonds are found to increase with increasing DMSO concentration in the solution. The slower translationaland rotational dynamics of NMA is observed in concentrated DMSO solution due to formation of strongerinter-species hydrogen bonds in the solution.

  19. Modification of electrical properties of PEDOT:PSS/p-Si heterojunction diodes by doping with dimethyl sulfoxide

    Pathak, C. S.; Singh, J. P.; Singh, R.


    We report about the fabrication and electrical characterization of heterojunction diodes between poly (3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) doped with dimethyl sulfoxide (DMSO) and p-Si. Electrical characterization of the heterojunction diodes was performed using current-voltage (I-V) measurements. The heterojunction diodes showed good rectifying behavior. Interestingly, for 5 vol.% doping concentration of DMSO, the heterojunction diode showed the best diode characteristics with an ideality factor of 1.9. The doping of DMSO into PEDOT:PSS solution resulted in an increase in the conductivity of films by two orders of magnitude and the films showed high optical transmission (>85%) in the visible region.

  20. Evaluation of dimethyl sulfoxide (DMSO) as a mobile phase additive during top 3 label-free quantitative proteomics.

    Strzelecka, Dominika; Holman, Stephen W; Eyers, Claire E


    Dimethyl sulfoxide (DMSO) has been advocated as a beneficial additive to electrospray solvents for peptide analysis due to the improved ionisation efficiency conferred. Previous reports have shown that the resultant improvements in peptide ion signal intensities are non-uniform. As a result, it was hypothesised that inclusion of DMSO in electrospray solvents could be detrimental to the outcome of intensity-based label-free absolute quantification approaches, specifically the top 3 method. The effect of DMSO as a mobile phase additive in top 3 label-free quantification was therefore evaluated. We show that inclusion of DMSO enhances data quality, improving the precision and number of proteins quantified, with no significant change to the quantification values observed in its absence.

  1. Synthesis of ZIF-67 and ZIF-8 crystals using DMSO (Dimethyl Sulfoxide) as solvent and kinetic transformation studies

    Feng, Xuhui; Wu, Ting; Carreon, Moises A.


    Herein we report the synthesis of ZIF-67 and ZIF-8 with Dimethyl Sulfoxide (DMSO) as solvent. The structural evolution of ZIF-67 and ZIF-8 as a function of time at room temperature was followed. We have identified the different stages of ZIF-67 and ZIF-8 formation (nucleation, crystallization, growth, and stationary periods) and elucidated its kinetics of transformation. The nucleation and growth of ZIF-67 and ZIF-8 crystals followed Avrami's kinetics. The role that DMSO plays in the crystallization and growth of ZIF-67 and ZIF-8 is discussed. The crystal sizes of ZIF-67 and ZIF-8 in the presence of DMSO as solvent were significantly smaller than those obtained in typical solvents such as methanol, making this solvent appealing for the synthesis of small crystals with relatively narrow size distribution, a property which is highly desirable for diverse functional applications.

  2. Excess molar enthalpies and heat capacities of dimethyl sulfoxide + seven normal alkanols at 303.15 K and atmospheric pressure

    Rubini, Katia [Dipartimento di Chimica ' G. Ciamician' , Universita Studi, via Selmi 2, I-40126 Bologna (Italy); Francesconi, Romolo [Dipartimento di Chimica ' G. Ciamician' , Universita Studi, via Selmi 2, I-40126 Bologna (Italy); Bigi, Adriana [Dipartimento di Chimica ' G. Ciamician' , Universita Studi, via Selmi 2, I-40126 Bologna (Italy); Comelli, Fabio [Istituto per la Sintesi Organica e la Fotoreattivita (ISOF)-CNR, via Gobetti 101, I-40129 Bologna (Italy)]. E-mail:


    Excess molar enthalpies and heat capacities of binary mixtures containing dimethyl sulfoxide (DMSO) + seven normal alkanols, namely methanol, ethanol, propan-1-ol, butan-1-ol, hexan-1-ol, octan-1-ol, and decan-1-ol, have been determined at 303.15 K and atmospheric pressure. With the exception of the DMSO-methanol system, which shows negative values, all mixtures show positive values of excess molar enthalpies over the whole range of mole fraction, increasing as the number of carbon atoms increases. Heat capacities of pure components have been determined in the range 288.15 < T (K) < 325.15. Molar heat capacities of the mixtures are always positive and decrease as the number of carbon atoms decreases. The results were fitted to the Redlich-Kister polynomial equation. Molecular interactions in the mixtures are interpreted on the basis of the results obtained.

  3. Dimethyl sulfoxide reduction by a hyperhermophilic archaeon Thermococcus onnurineus NA1 via a cysteine-cystine redox shuttle.

    Choi, Ae Ran; Kim, Min-Sik; Kang, Sung Gyun; Lee, Hyun Sook


    A variety of microbes grow by respiration with dimethyl sulfoxide (DMSO) as an electron acceptor, and several distinct DMSO respiratory systems, consisting of electron carriers and a terminal DMSO reductase, have been characterized. The heterotrophic growth of a hyperthermophilic archaeon Thermococcus onnurineus NA1 was enhanced by the addition of DMSO, but the archaeon was not capable of reducing DMSO to DMS directly using a DMSO reductase. Instead, the archaeon reduced DMSO via a cysteine-cystine redox shuttle through a mechanism whereby cystine is microbially reduced to cysteine, which is then reoxidized by DMSO reduction. A thioredoxin reductase-protein disulfide oxidoreductase redox couple was identified to have intracellular cystine-reducing activity, permitting recycle of cysteine. This study presents the first example of DMSO reduction via an electron shuttle. Several Thermococcales species also exhibited enhanced growth coupled with DMSO reduction, probably by disposing of excess reducing power rather than conserving energy.

  4. The effect of structural properties on rheological behaviour of starches in binary dimethyl sulfoxide-water solutions

    Ptaszek, Paweł; Dziubiński, Marek; Grzesik, N. Mirosław; Liszka-Skoczylas, Marta


    This research study analysed the rheological properties of potato amylose and potato amylopectin in binary solutions of the following water and dimethyl sulfoxide concentrations: 90% DMSO (1), 80% DMSO (2) and 50% DMSO (3), with preparation methodology involving the dissolution at the temperature of 98°C. The studies of dynamic light scattering on the biopolymer coils and the determination of main relaxation times of the solutions were carried out. For the amylose solutions, the fast relaxation phenomena are predominant. The results of the quality tests of the hysteresis loop showed, that the amylose solutions in the solvents (1) and (2) are rheologically stable and shear-thickened. The amylose solutions in solvents (3) reveal oscillatory alterations of viscosity in the time. Amylopectin solutions are characterized by 80% share of slow relaxation phenomena, very low diffusion coefficients and hydrodynamic radii in the range of 2000 nm. The amylopectin solutions are rheologically unstable. PMID:28152071

  5. Cryopreservation of Peruvian Paso horse spermatozoa: dimethylacetamide preserved an optimal sperm function compared to dimethyl sulfoxide, ethylene glycol and glycerol.

    Santiani, A; Evangelista-Vargas, S; Vargas, S; Gallo, S; Ruiz, L; Orozco, V; Rosemberg, M


    The objective was to evaluate the effect of different cryoprotectant agents in the cryopreservation of Peruvian Paso horse semen. Twenty semen samples were collected from five Peruvian Paso horse stallions. Each sample was divided into 12 parts to form the groups: dimethylacetamide (DMA), dimethyl sulfoxide (DMSO), ethylene glycol (EG) and glycerol (GLY), at 3%, 4% and 5%. Samples were frozen using a rate-controlled freezer. Sperm parameters evaluated were motility and viability/acrosomal status. After thawing, progressive motility in DMA group was higher (p < .05) than in DMSO, EG and GLY groups. Similarly, viable acrosome-intact spermatozoa were higher (p < .05) using DMA in comparison with DMSO. No differences were found when comparing concentrations for any of the cryoprotectant agents. In conclusion, DMA seems to be a good cryoprotectant agent for the cryopreservation of Peruvian Paso horse stallion semen. © 2016 Blackwell Verlag GmbH.

  6. The effect of structural properties on rheological behaviour of starches in binary dimethyl sulfoxide-water solutions.

    Ptaszek, Anna; Ptaszek, Paweł; Dziubiński, Marek; Grzesik, N Mirosław; Liszka-Skoczylas, Marta


    This research study analysed the rheological properties of potato amylose and potato amylopectin in binary solutions of the following water and dimethyl sulfoxide concentrations: 90% DMSO (1), 80% DMSO (2) and 50% DMSO (3), with preparation methodology involving the dissolution at the temperature of 98°C. The studies of dynamic light scattering on the biopolymer coils and the determination of main relaxation times of the solutions were carried out. For the amylose solutions, the fast relaxation phenomena are predominant. The results of the quality tests of the hysteresis loop showed, that the amylose solutions in the solvents (1) and (2) are rheologically stable and shear-thickened. The amylose solutions in solvents (3) reveal oscillatory alterations of viscosity in the time. Amylopectin solutions are characterized by 80% share of slow relaxation phenomena, very low diffusion coefficients and hydrodynamic radii in the range of 2000 nm. The amylopectin solutions are rheologically unstable.

  7. The pilot test of Pt-Pd and Pt-Rh feeds extracted and separated with a new sulfoxide extractant


    Platinum, palladium and rhodium of the raw feeds extracted and separated with a new sulfoxide extractant (MSO)were studied in the paper. The pilot test results showed that the percentage extractions are more than 99% for platinum and palladium in Pt-Pd feed, and the percentage strippings are 100% and 99.2% with HCl and ammonia, respectively. The ratio of palladium to platinum is 0.0016 in stripping platinum solution, and the ratio of platinum to palladium is 0.0020 in stripping palladium solution. The percentage extraction of platinum is 99% in Pt-Rh feed, and the percentage stripping is 100%.The ratio of rhodium to platinum is 0.0002 in stripping platinum solution. Therefore, platinum, palladium, and rhodium feeds are separated effectively with MSO.

  8. Electrodeposition of nanocrystalline CdSe thin films from dimethyl sulfoxide solution: Nucleation and growth mechanism, structural and optical studies

    Henriquez, R., E-mail: [Instituto de Quimica, Facultad de Ciencias, Pontificia Universidad Catolica de Valparaiso, Casilla 4059, Valparaiso (Chile); Badan, A. [Instituto de Fisica, Facultad de Ingenieria, Herrera y Reissig 565, C.C. 30, 11000 Montevideo (Uruguay); Grez, P.; Munoz, E.; Vera, J. [Instituto de Quimica, Facultad de Ciencias, Pontificia Universidad Catolica de Valparaiso, Casilla 4059, Valparaiso (Chile); Dalchiele, E.A.; Marotti, R.E. [Instituto de Fisica, Facultad de Ingenieria, Herrera y Reissig 565, C.C. 30, 11000 Montevideo (Uruguay); Gomez, H. [Instituto de Quimica, Facultad de Ciencias, Pontificia Universidad Catolica de Valparaiso, Casilla 4059, Valparaiso (Chile)


    Highlights: > Electrodeposition of CdSe nanocrystalline semiconductor thin films. > Polycrystalline wurtzite structure with a slight (1010) preferred orientation. > Absorption edge shifts in the optical properties due to quantum confinement effects. - Abstract: Cadmium selenide (CdSe) nanocrystalline semiconductor thin films have been synthesized by electrodeposition at controlled potential based in the electrochemical reduction process of molecular selenium in dimethyl sulfoxide (DMSO) solution. The nucleation and growth mechanism of this process has been studied. The XRD pattern shows a characteristic polycrystalline hexagonal wurtzite structure with a slight (1 0 1 0) crystallographic preferred orientation. The crystallite size of nanocrystalline CdSe thin films can be simply controlled by the electrodeposition potential. A quantum size effect is deduced from the correlation between the band gap energy and the crystallite size.

  9. Methionine sulfoxide reductase B3 deficiency stimulates heme oxygenase-1 expression via ROS-dependent and Nrf2 activation pathways

    Kwak, Geun-Hee; Kim, Ki Young; Kim, Hwa-Young, E-mail:


    Methionine sulfoxide reductase B3 (MsrB3), which is primarily found in the endoplasmic reticulum (ER), is an important protein repair enzyme that stereospecifically reduces methionine-R-sulfoxide residues. We previously found that MsrB3 deficiency arrests the cell cycle at the G{sub 1}/S stage through up-regulation of p21 and p27. In this study, we report a critical role of MsrB3 in gene expression of heme oxygenase-1 (HO-1), which has an anti-proliferative effect associated with p21 up-regulation. Depletion of MsrB3 elevated HO-1 expression in mammalian cells, whereas MsrB3 overexpression had no effect. MsrB3 deficiency increased cellular reactive oxygen species (ROS), particularly in the mitochondria. ER stress, which is associated with up-regulation of HO-1, was also induced by depletion of MsrB3. Treatment with N-acetylcysteine as an ROS scavenger reduced augmented HO-1 levels in MsrB3-depleted cells. MsrB3 deficiency activated Nrf2 transcription factor by enhancing its expression and nuclear import. The activation of Nrf2 induced by MsrB3 depletion was confirmed by increased expression levels of its other target genes, such as γ-glutamylcysteine ligase. Taken together, these data suggest that MsrB3 attenuates HO-1 induction by inhibiting ROS production, ER stress, and Nrf2 activation. -- Highlights: •MsrB3 depletion induces HO-1 expression. •MsrB3 deficiency increases cellular ROS and ER stress. •MsrB3 deficiency activates Nrf2 by increasing its expression and nuclear import. •MsrB3 attenuates HO-1 induction by inhibiting ROS production and Nrf2 activation.

  10. Systematic review of the nutritional supplements dimethyl sulfoxide (DMSO) and methylsulfonylmethane (MSM) in the treatment of osteoarthritis.

    Brien, S; Prescott, P; Bashir, N; Lewith, H; Lewith, G


    Conventional treatment of osteoarthritis (OA) with non-steroidal anti-inflammatory drugs is associated with serious gastrointestinal side effects and in view of the recent withdrawal of some cyclo-oxygenase-2 inhibitors, identifying safer alternative treatment options is needed. The objective of this systematic review is to evaluate the existing evidence from randomised controlled trials of two chemically related nutritional supplements, dimethyl sulfoxide (DMSO) and methylsulfonylmethane (MSM) in the treatment of OA to determine their efficacy and safety profile. The electronic databases [Cochrane Library, Medline, Embase, Amed, Cinahl and NeLH (1950 to November 2007)] were searched. The search strategy combined terms: osteoarthritis, degenerative joint disorder, dimethyl sulfoxide, DMSO, methylsulfonylmethane, MSM, clinical trial; double-blind, single blind, RCT, placebo, randomized, comparative study, evaluation study, control. Inclusion and exclusion criteria were applied. Data were extracted and quality was assessed using the JADAD scale. Six studies were included [evaluating a total of 681 patients with OA of the knee for DMSO (N=297 on active treatment); 168 patients for MSM (N=52 on active treatment)]. Two of the four DMSO trials, and both MSM trials reported significant improvement in pain outcomes in the treatment group compared to comparator treatments, however, methodological issues and concerns over optimal dosage and treatment period, were highlighted. No definitive conclusion can currently be drawn for either supplement. The findings from all the DMSO studies need to be viewed with caution because of poor methodology including; possible unblinding, and questionable treatment duration and dose. The data from the more rigorous MSM trials provide positive but not definitive evidence that MSM is superior to placebo in the treatment of mild to moderate OA of the knee. Further studies are now required to identify both the optimum dosage and longer

  11. Relation between phase composition and photocatalytic activity of TiO{sub 2} in a sulfoxide deoxygenation reaction

    Molinari, Alessandra, E-mail: [Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, Via Fossato di Mortara 17, 44121 Ferrara (Italy); Bonino, Francesca; Magnacca, Giuliana [Dipartimento di Chimica, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, I-10125, Turin (Italy); Demaria, Francesca; Maldotti, Andrea [Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara, Via Fossato di Mortara 17, 44121 Ferrara (Italy)


    In the present study we synthesize three TiO{sub 2} samples, TiO{sub 2}-500, TiO{sub 2}-750 and TiO{sub 2}-850, by a sol–gel procedure varying the rutile and anatase content by calcination at different temperatures. Characterization by XRD, NIR-Raman, UV-Raman, BET, DR-UV-Vis spectroscopy and SEM points out that TiO{sub 2}-500 consists mainly of anatase and TiO{sub 2}-850 of rutile. TiO{sub 2}-700 presents both phases on the surface that is the part of the photocatalyst interested by UV illumination. The photocatalysts are tested in the deoxygenation reaction of methyl p-tolyl sulfoxide to the corresponding sulfide using 2-propanol as hole scavenger. It is demonstrated that the presence of both anatase and rutile on the surface of TiO{sub 2}-700 is responsible of the increase of the photocatalytic activity. This is likely due to a more efficient charge separation process that increases lifetime of the charges giving availability of electrons and holes for the photocatalytic reaction. Methyl p-tolyl sulfide is formed with a selectivity of 100%. - Highlights: • TiO{sub 2} samples are synthesized via sol–gel varying the rutile and anatase composition. • TiO{sub 2}-700 (calcined at 700 °C) presents both anatase and rutile on the surface. • Efficient charges separation is allowed by the presence of anatase and rutile. • Spatial separation of charges renders TiO{sub 2}-700 the most active photocatalyst. • Methyl p-tolyl sulfoxide is transformed in sulfide with 100% selectivity.

  12. Methionine sulfoxide reductase A protects hepatocytes against acetaminophen-induced toxicity via regulation of thioredoxin reductase 1 expression.

    Singh, Mahendra Pratap; Kwak, Geun-Hee; Kim, Ki Young; Kim, Hwa-Young


    Thioredoxin reductase 1 (TXNRD1) is associated with susceptibility to acetaminophen (APAP)-induced liver damage. Methionine sulfoxide reductase A (MsrA) is an antioxidant and protein repair enzyme that specifically catalyzes the reduction of methionine S-sulfoxide residues. We have previously shown that MsrA deficiency exacerbates acute liver injury induced by APAP. In this study, we used primary hepatocytes to investigate the underlying mechanism of the protective effect of MsrA against APAP-induced hepatotoxicity. MsrA gene-deleted (MsrA(-/-)) hepatocytes showed higher susceptibility to APAP-induced cytotoxicity than wild-type (MsrA(+/+)) cells, consistent with our previous in vivo results. MsrA deficiency increased APAP-induced glutathione depletion and reactive oxygen species production. APAP treatment increased Nrf2 activation more profoundly in MsrA(-/-) than in MsrA(+/+) hepatocytes. Basal TXNRD1 levels were significantly higher in MsrA(-/-) than in MsrA(+/+) hepatocytes, while TXNRD1 depletion in both MsrA(-/-) and MsrA(+/+) cells resulted in increased resistance to APAP-induced cytotoxicity. In addition, APAP treatment significantly increased TXNRD1 expression in MsrA(-/-) hepatocytes, while no significant change was observed in MsrA(+/+) cells. Overexpression of MsrA reduced APAP-induced cytotoxicity and TXNRD1 expression levels in APAP-treated MsrA(-/-) hepatocytes. Collectively, our results suggest that MsrA protects hepatocytes from APAP-induced cytotoxicity through the modulation of TXNRD1 expression. Copyright © 2017 Elsevier Inc. All rights reserved.

  13. Stereospecific capillary electrophoresis assays using pentapeptide substrates for the study of Aspergillus nidulans methionine sulfoxide reductase A and mutant enzymes.

    Zhu, Qingfu; El-Mergawy, Rabab G; Zhou, Yuzhen; Chen, Chunyang; Heinemann, Stefan H; Schönherr, Roland; Robaa, Dina; Sippl, Wolfgang; Scriba, Gerhard K E


    Stereospecific capillary electrophoresis-based methods for the analysis of methionine sulfoxide [Met(O)]-containing pentapeptides were developed in order to investigate the reduction of Met(O)-containing peptide substrates by recombinant Aspergillus nidulans methionine sulfoxide reductase A (MsrA) as well as enzymes carrying mutations in position Glu99 and Asp134. The separation of the diastereomers of the N-acetylated, C-terminally 2,4-dinitrophenyl (Dnp)-labeled pentapeptides ac-Lys-Phe-Met(O)-Lys-Lys-Dnp, ac-Lys-Asp-Met(O)-Asn-Lys-Dnp and ac-Lys-Asn-Met(O)-Asp-Lys-Dnp was achieved in 50 mM Tris-HCl buffers containing sulfated β-CD in fused-silica capillaries, while the diastereomer separation of ac-Lys-Asp-Met(O)-Asp-Lys-Dnp was achieved by sulfated β-CD-mediated MEKC. The methods were validated with regard to range, linearity, accuracy, limits of detection and quantitation as well as precision. Subsequently, the substrates were incubated with wild-type MsrA and three mutants in the presence of dithiothreitol as reductant. Wild-type MsrA displayed the highest activity towards all substrates compared to the mutants. Substitution of Glu99 by Gln resulted in the mutant with the lowest activity towards all substrates except for ac-Lys-Asn-Met(O)-Asp-Lys-Dnp, while replacement Asn for Asp134 lead to a higher activity towards ac-Lys-Asp-Met(O)-Asn-Lys-Dnp compared with the Glu99 mutant. The mutant with Glu instead of Asp134 was the most active among the mutant enzymes. Molecular modeling indicated that the conserved Glu99 residue is buried in the Met-S-(O) groove, which might contribute to the correct placing of substrates and, consequently, to the catalytic activity of MsrA, while Asp134 did not form hydrogen bonds with the substrates but only within the enzyme.

  14. Cloning, tissue expression pattern characterization and chromosome localization of human peptide methionine sulfoxide reductase cDNA


    Oxidation and reduction of some amino acids are one of the molecular mechanisms for regulating the function of proteins. The oxidation of methionine (Met) to methionine sulfoxide (Met(O)) results in decreasing or loss of the biological activity of related proteins. It was found that peptide methionine sulfoxide reductase (msrA) can reduce Met(O) to Met and therefore restored the biological function of the oxidized proteins. To reveal the methionine oxidation-reduction mechanism in human body, in this study, the cDNA sequence of bovine msrA was used as an information-probe to screen the human EST database. Based on a contig assembled from homologous ESTs, a 1 256-bp human MSRA cDNA was cloned from several human cDNA libraries. The cDNA contains an open reading frame (ORF) of 705 bp in length, which encodes 235 amino acid residues. Homology comparison revealed that human MSRA shares 88% and 61% identities with bovine and Escherichia coli msrA protein respectively. Expression pattern analysis revealed a single 1.6-kb transcript of human MSRA in most human tissues and with highest expression in kidney. By radiation hybrid panel mapping, the gene was localized to human chromosome 8p22-23 between markers D8S518 and D8S550. There are 2 human inherited diseases Keratolytic Winter Erythema and Microcephaly related genes in this region, it is inferred that human MSRA might be the candidate of the two diseases.

  15. Leishmania major methionine sulfoxide reductase A is required for resistance to oxidative stress and efficient replication in macrophages.

    Fiona M Sansom

    Full Text Available Leishmania are protozoan parasites that proliferate within the phagolysome of mammalian macrophages. While a number of anti-oxidant systems in these parasites have been shown to protect against endogenous as well as host-generated reactive oxygen species, the potential role of enzymes involved in the repair of oxidatively damaged proteins remains uncharacterized. The Leishmania spp genomes encode a single putative methionine sulfoxide reductase (MsrA that could have a role in reducing oxidized free and proteinogenic methionine residues. A GFP-fusion of L. major MsrA was shown to have a cytoplasmic localization by immunofluorescence microscopy and subcellular fractionation. An L. major msrA null mutant, generated by targeted replacement of both chromosomal allelles, was viable in rich medium but was unable to reduce exogenous methionine sulfoxide when cultivated in the presence of this amino acid, indicating that msrA encodes a functional MsrA. The ΔmsrA mutant exhibited increased sensitivity to H(2O(2 compared to wild type parasites and was unable to proliferate normally in macrophages. Wild type sensitivity to H(2O(2 and infectivity in macrophages was restored by complementation of the mutant with a plasmid encoding MsrA. Unexpectedly, the ΔmsrA mutant was able to induce normal lesions in susceptible BALB/c indicating that this protein is not essential for pathogenesis in vivo. Our results suggest that Leishmania MsrA contributes to the anti-oxidative defences of these parasites, but that complementary oxidative defence mechansims are up-regulated in lesion amastigotes.

  16. Methionine sulfoxide reductase B1 deficiency does not increase high-fat diet-induced insulin resistance in mice.

    Heo, Jung-Yoon; Cha, Hye-Na; Kim, Ki Young; Lee, Eujin; Kim, Suk-Jeong; Kim, Yong-Woon; Kim, Jong-Yeon; Lee, In-Kyu; Gladyshev, Vadim N; Kim, Hwa-Young; Park, So-Young


    Methionine-S-sulfoxide reductase (MsrA) protects against high-fat diet-induced insulin resistance due to its antioxidant effects. To determine whether its counterpart, methionine-R-sulfoxide reductase (MsrB) has similar effects, we compared MsrB1 knockout and wild-type mice using a hyperinsulinemic-euglycemic clamp technique. High-fat feeding for eight weeks increased body weights, fat masses, and plasma levels of glucose, insulin, and triglycerides to similar extents in wild-type and MsrB1 knockout mice. Intraperitoneal glucose tolerance test showed no difference in blood glucose levels between the two genotypes after eight weeks on the high-fat diet. The hyperglycemic-euglycemic clamp study showed that glucose infusion rates and whole body glucose uptakes were decreased to similar extents by the high-fat diet in both wild-type and MsrB1 knockout mice. Hepatic glucose production and glucose uptake of skeletal muscle were unaffected by MsrB1 deficiency. The high-fat diet-induced oxidative stress in skeletal muscle and liver was not aggravated in MsrB1-deficient mice. Interestingly, whereas MsrB1 deficiency reduced JNK protein levels to a great extent in skeletal muscle and liver, it markedly elevated phosphorylation of JNK, suggesting the involvement of MsrB1 in JNK protein activation. However, this JNK phosphorylation based on a p-JNK/JNK level did not positively correlate with insulin resistance in MsrB1-deficient mice. Taken together, our results show that, in contrast to MsrA deficiency, MsrB1 deficiency does not increase high-fat diet-induced insulin resistance in mice.

  17. 5,5′-[1,4-Phenylenebis(methylenesulfanediyl]bis[1,3,4-thiadiazol-2(3H-one] dimethyl sulfoxide disolvate

    Siyoung Jang


    Full Text Available The asymmetric unit of the title compound, C12H10N4O2S4·2C2H6OS, contains one half of the p-xylene molecule and one dimethyl sulfoxide molecule. The p-xylene molecule is located about a crystallographic inversion centre. In the molecule, the thiadiazole and benzene rings are almost perpendicular to one another, with a dihedral angle of 88.95 (6°. In the crystal, an N—H...O hydrogen bond is observed between the two components. The dimethyl sulfoxide molecule is disordered over two orientations with an occupancy ratio of 0.879 (1:0.121 (1.

  18. Diclofenac sodium topical solution with dimethyl sulfoxide, a viable alternative to oral nonsteroidal anti-inflammatories in osteoarthritis: review of current evidence

    Fuller P; Roth SH


    Philip Fuller¹, Sanford Roth²¹Covidien, Hazelwood, MO; ²Arizona Research and Education, Arthritis Research Laboratory, Arizona State University, Phoenix, AZ, USAAbstract: Topical nonsteroidal anti-inflammatory drugs (NSAIDs) may offer a safer alternative to their oral counterparts for the management of osteoarthritis. Diclofenac sodium topical solution with dimethyl sulfoxide (TDiclo) was evaluated in five randomized, controlled trials and is indicated for ...

  19. Design and Synthesis of Novel 5-Sulfoxide-substituted Pyrazolo[5,1-d] [1,2,3,5]tetrazin-4(3H)ones


    A series of novel 5-sulfoxide-substituted pyrazolo[5,1-d][1,2,3,5]tetrazin-4(3H)ones 4a-j were designed and efficiently synthesized via a diazotization of 5-amine-3-methylsulfinyl1H-pyrazole, followed by cycloaddition with aryl isocyanate. A possible reaction mechanism is outlined and discussed. These new compounds exhibit some biological activity as preliminary bioassay indicated. Their structures were confirmed with1 H NMR, IR and elemental analysis.

  20. Poly[μ3-chlorido-μ2-chloridodichlorido(μ-dimethyl sulfoxide-κ2O:S(dimethyl sulfoxide-κO(μ-pyrimidine-κ2N:N′ruthenium(IIIsodium

    Skylar Ferrara


    Full Text Available The title complex, [NaRuCl4(C4H4N2(C2H6OS2]n, is the sodium salt of monoanionic octahedral [RuIIICl4(pyrimidine(DMSO]− in which the sulfur-bound dimethyl sulfoxide (DMSO and pyrimidine ligand are oriented trans to one another on the RuIII atom. The average of the four Ru—Cl bond lengths is 2.355 (15 Å, and the Ru—S and Ru—N bond lengths are 2.2853 (3 and 2.1165 (11 Å, respectively. The complex forms a chain, with a six-coordinate sodium ion bridging the ruthenium(III units. The sodium cation is coordinated by cis-chloride ligands on ruthenium [Na—Cl = 2.9576 (7 and 2.6988 (7 Å], chloride and DMSO ligands from the ruthenium complexes related by inversion [Na—Cl and Na—O = 2.8888 (7 and 2.2623 (12 Å, respectively], a nitrogen ligand from the pyrimidine of the tetrachloridoruthenium(III complex related by the twofold rotation axis [Na—N = 2.5224 (14 Å] and an oxygen-bound DMSO [Na—O = 2.3165 (12 Å].

  1. Poly[di-μ2-chlorido-dichlorido(μ3-dimethyl sulfoxide-κ3O:O:S(μ2-dimethyl sulfoxide-κ2O:Sruthenium(IIIsodium

    Zdeněk Trávníček


    Full Text Available The structure of the title compound, [NaRuCl4(C2H6OS2]n, comprises centrosymmetric [RuCl2(DMSONa(DMSOCl2Ru] units (DMSO is dimethyl sulfoxide, C2H6OS, with two Ru atoms, each lying on a crystallographic centre of inversion, connected via Na atoms, DMSO and chloride ligands into a two-dimensional (110 array. Both RuIII atoms are octahedrally coordinated by four chloride ligands in the equatorial plane and by two DMSO molecules in apical positions within a RuCl4S2 donor set. The Na atom is surrounded by three chloride anions and three O atoms derived from three DMSO molecules, with the resulting Cl3O3 donor set defining an octahedron. The crystal structure is further stabilized by interatomic interactions of the types C...Cl [C—Cl = 3.284 (2 Å], C—H...Cl [C...Cl = 3.903 (3 Å] and C—H...O [C...O = 3.376 (3 Å].

  2. Hexakis(dimethyl sulfoxide-κOzinc mer-aquatris(dimethyl sulfoxide-κO(ethanol-κO[octadecatungstodiphosphato(V-κO]zincate(II–dimethyl sulfoxide–ethanol–water (2/4/2/3

    Imen Hammami


    Full Text Available In the title compound, [Zn(C2H6OS6]2[Zn(α-P2W18O62(C2H5OH(C2H6OS3(H2O]·2C2H6OS·C2H5OH·1.5H2O, there are two types of ZnII complex ions. In the [Zn(α-P2W18O62(C2H5OH(C2H6OS3(H2O]4− anion, the ZnII cation is coordinated by a Wells–Dawson polyanion [α-P2W18O62]6− (POM via a terminal O atom, three dimethyl sulfoxide (DMSO ligands, one ethanol ligand and one water ligand in a distorted octahedral geometry. The two independent [Zn(C2H6OS6]2+ cations exhibit similar distorted octahedral coordination spheres, and both ZnII cations are coordinated by six DMSO ligands. The crystal packing is governed by extensive O—H...O hydrogen bonds and weak C—H...O hydrogen bonds, forming a three-dimensional supramolecular structure. The S atoms of some DMSO molecules are disordered over two positions with different site-occupancy ratios.

  3. Flexible C2-symmetric bis-sulfoxides as ligands in enantioselective 1,4-addition of boronic acids to electron-deficient alkenes.

    Khiar, Noureddine; Salvador, Álvaro; Valdivia, Victoria; Chelouan, Ahmed; Alcudia, Ana; Álvarez, Eleuterio; Fernández, Inmaculada


    The application of acyclic C2-symmetric chelating bis-sulfoxide ligands in the Rh(I)-catalyzed enantioselective 1,4-addition of boronic acids to electron-deficient alkenes is reported. Among the acyclic ethane-bridged bis-sulfoxides tested, the ligand Ferbisox (11), bearing ferrocenyl moieties as substituents at the sulfinyl sulfurs, has exhibited the best results in terms of chemical yield (up to 96%) and enantioselectivity (up to 97% ee). The conjugate addition takes place smoothly in toluene at room temperature in short reaction times (typically 2 h). The reaction scope, including the use of different boronic acids, five-, six-, and seven-membered cyclic enones, an unsaturated lactone, and the most challenging acyclic ketones, is reported. An X-ray diffraction study of the [Ferbisox·RhCl]2 precatalyst clearly exhibits a dimeric structure with an S coordination of the sulfoxide to rhodium. On the basis of the X-ray data and on structural studies conducted in solution by (1)H NMR, a model explaining the high enantioselection observed is proposed.

  4. Synthesis and Crystal Structure of Tri-(2-mercaptopyridine N-oxide)bis(dimethyl sulfoxide) Dysprosium(Ⅲ)


    A range of rare earth metal complexes of 2-mercaptopyridine N-oxide (Hmpo) have been synthesized, and studied by elemental analysis and IR spectroscopic technique. Crystal structure of Dy(mpo)3(DMSO)2 (DMSO = dimethyl sulfoxide) has been determined. The complex crystallizes in the triclinic system, space group Pī with lattice parameters: a = 9.602(3), b = 9.803(3), c = 15.498(5)A, α= 89.51(1), β= 85.73(1), γ= 62.99(1)°, Dc = 1.787 g/cm3, C19H24N3O5S5Dy, Mr = 697.21, Z = 2, F(000) = 690, μ = 3.321mm-1, the final R = 0.0237 and wR = 0.0587 for 4116 reflections with I>σ2(I). The coordination number of dysprosium Ⅲ is eight, and its coordination geometry is a somewhat distorted square antiprism with O(3), O(4), O(5), S(3) and O(1), O(2), S(1), S(2) at the tetragonal bases (dihedral angle between their mean planes is 2.9(1)0). Around the Dy atom, three five-membered ring planes (Dy, O, N, C, S) make the dihedral angles of 74.42, 11.31 and 83.72, respectively.

  5. Crystal structure, optical, magnetic, and photochemical properties of the complex pentakis(dimethyl sulfoxide) nitrosylchromium(2+) hexafluorophosphate

    Døssing, Anders Rørbæk; Kadziola, Anders; Dethlefsen, Johannes Wied


          The nitrosyl complex [Cr(dmso)5(NO)](PF6)2 (1) (dmso = dimethyl sulfoxide) has been prepared by the solvolysis of [Cr(NCCH3)5(NO)](PF6)2 in neat dmso. The compound 1 crystallizes in orthorhombic space group Pna21 with a = 11.3370(15), b = 24.0790(5), and c = 11.007(3) Å at 122 K...... with an almost linear Cr-N-O angle (176.45(13)°). The optical absorption spectrum of 1 in dmso shows maxima at 734, 567, 450, 413, and 337 nm. Continuous photolysis of 1 with l = 365 - 580 nm light in dmso solution results in a release of NO with quantum yield, F, in the range 0.034 - 0.108 mol×Einstein-1......, g¦ and g-: 1.96725, 1.91881(4) and 1.992763(2); Aiso(53Cr), A¦(53Cr) and A-(53Cr): 22.8´10-4, 39´10-4 and 15.8´10-4cm-1; Aiso(14N), A¦(14N) and A-(14N): 5.9´10-4, 2´10-4 and 7.540(4)´10-4 cm-1. The pseudo-first-order rate constant, k, for the substitution of the dmso ligands in 1 with dmso has been...

  6. Synthesis and Fluorescence Property of Eu3+,Tb3+ Perchlorate Complexes with Diphenyl Sulfoxide and 1,10-Phenanthroline

    李文先; 王宏胜; 罗青山; 齐其格


    Two ternary complexes of RE(ClO4)3-DPSO-phen and two binary complexes of RE(ClO4)3-phen have been synthesized (RE=Eu, Tb; DPSO=diphenyl sulfoxide, phen=1,10-phenanthroline). Elemental analysis and TG-DTA studies suggest that the ternary complexes consist of RE(ClO4)3(DPSO)(phen)3·nH2O (n=1, 3) and binary complexes consist of RE(phen)4(ClO4)3. IR spectra studies indicate that the DPSO ligand is bonded with RE(Ⅲ) through oxygen atom in sulfinyl group and phen ligand is bonded to RE(Ⅲ) through nitrogen atom. The molar conductivities measured in the acetonitrile solution indicate that two inorganic anions ClO4- are coordinated and binary complexes are nonelectrolyte. In the fluorescent spectra it was found that the fluorescence emission intensity of the ternary complexes more intensive than that of the binary complexes.

  7. Effect of dimethyl sulfoxide on bond durability of fiber posts cemented with etch-and-rinse adhesives

    Shafiei, Fereshteh; Sarafraz, Zahra


    PURPOSE This study was undertaken to investigate whether use of an adhesive penetration enhancer, dimethyl sulfoxide (DMSO), improves bond stability of fiber posts to root dentin using two two-step etch-and-rinse resin cements. MATERIALS AND METHODS Forty human maxillary central incisor roots were randomly divided into 4 groups after endodontic treatment and post space preparation, based on the fiber post/cement used with and without DMSO pretreatment. Acid-etched root dentin was treated with 5% DMSO aqueous solution for 60 seconds or with distilled water (control) prior to the application of Excite DSC/Variolink II or One-Step Plus/Duo-link for post cementation. After micro-slicing the bonded root dentin, push-out bond strength (P-OBS) test was performed immediately or after 1-year of water storage in each group. Data were analyzed using three-way ANOVA and Student's t-test (α=.05). RESULTS A significant effect of time, DMSO treatment, and treatment × time interaction were observed (P.05). CONCLUSION DMSO-wet bonding might be a beneficial method in preserving the stability of resin-dentin bond strength over time when fiber post is cemented with the tested etch-and-rinse adhesive cements. PMID:27555893

  8. Fullerenol C60(OH)24 nanoparticles decrease relaxing effects of dimethyl sulfoxide on rat uterus spontaneous contraction

    Slavic, Marija; Djordjevic, Aleksandar; Radojicic, Ratko; Milovanovic, Slobodan; Orescanin-Dusic, Zorana; Rakocevic, Zlatko; Spasic, Mihajlo B.; Blagojevic, Dusko


    Dimethyl sulfoxide (DMSO) is a widely used solvent and cryoprotectant that can cause impaired blood flow, reduction in intracranial pressure, tissue edema, inflammatory reactions, inhibition of vascular smooth muscle cell migration and proliferation, processes which can lead to atherosclerosis of the coronary, peripheral and cerebral circulation. Although the adverse effects are rare when DMSO is administered in clinically established concentrations, there is no safe antagonist for an overdose. In this work, we treated isolated spontaneous and calcium-induced contractile active rat uteri (Wistar, virgo intacta), with DMSO and fullerenol C60(OH)24 nanoparticle (FNP) in DMSO. FNP is a water-soluble derivative of fullerene C60. Its size is a 1.1 nm in diameter and is a very promising candidate for a drug carrier in nanomedicine. FNP also displays free radical scavenging activity. DMSO decreased both spontaneous and calcium-induced contractions. In contrast, FNP only decreased spontaneous contraction. FNP decreased copper-zinc superoxide dismutase activity and prevented the DMSO-induced increase in glutathione reductase activity. Atomic force microscopy detected that FNP aggregated with calcium ions. Our results indicate that FNP has properties that make it a good candidate to be a modulator of DMSO activity which could minimize side effects of the latter.

  9. Effect of Cytochalasin B, Lantrunculin B, Colchicine, Cycloheximid, Dimethyl Sulfoxide and Ion Channel Inhibitors on Biospeckle Activity in Apple Tissue.

    Kurenda, Andrzej; Pieczywek, Piotr M; Adamiak, Anna; Zdunek, Artur


    The biospeckle phenomenon is used for non-destructive monitoring the quality of fresh fruits and vegetables, but in the case of plant tissues there is a lack of experimentally confirmed information about the biological origin of the biospeckle activity (BA). As a main sources of BA, processes associated with the movement inside the cell, such as cytoplasmic streaming, organelle movement and intra- and extracellular transport mechanisms, are considered. The aim of this study is to investigate the effect of metabolism inhibitors, connected with intracellular movement such as cytochalasin B, lantrunculin B, colchicine, cycloheximid, dimethyl sulfoxide (DMSO) and mixture of ion channel inhibitors, injected into apples, on BA. Two methods of BA analysis based on cross-correlation coefficient and Laser Speckle Contrast Analysis (LASCA) were used. DMSO, lantrunculin B and mixture of ion channel inhibitors have a significant effect on BA, and approximately 74 % of BA of apple tissue is potentially caused by biological processes. Results indicate that the functioning of actin microfilaments and ion channels significantly affect BA.

  10. Effects of Dimethyl Sulfoxide in Cholesterol-Containing Lipid Membranes: A Comparative Study of Experiments In Silico and with Cells

    de Ménorval, Marie-Amélie; Mir, Lluis M.; Fernández, M. Laura; Reigada, Ramon


    Dimethyl sulfoxide (DMSO) has been known to enhance cell membrane permeability of drugs or DNA. Molecular dynamics (MD) simulations with single-component lipid bilayers predicted the existence of three regimes of action of DMSO: membrane loosening, pore formation and bilayer collapse. We show here that these modes of action are also reproduced in the presence of cholesterol in the bilayer, and we provide a description at the atomic detail of the DMSO-mediated process of pore formation in cholesterol-containing lipid membranes. We also successfully explore the applicability of DMSO to promote plasma membrane permeability to water, calcium ions (Ca2+) and Yo-Pro-1 iodide (Yo-Pro-1) in living cell membranes. The experimental results on cells in culture can be easily explained according to the three expected regimes: in the presence of low doses of DMSO, the membrane of the cells exhibits undulations but no permeability increase can be detected, while at intermediate DMSO concentrations cells are permeabilized to water and calcium but not to larger molecules as Yo-Pro-1. These two behaviors can be associated to the MD-predicted consequences of the effects of the DMSO at low and intermediate DMSO concentrations. At larger DMSO concentrations, permeabilization is larger, as even Yo-Pro-1 can enter the cells as predicted by the DMSO-induced membrane-destructuring effects described in the MD simulations. PMID:22848583

  11. Crystal structure of μ-oxalato-κ2O1:O2-bis[(dimethyl sulfoxide-κOtriphenyltin(IV

    Serigne Fallou Pouye


    Full Text Available In the previously reported [C2O4(SnPh32] complex [Diop et al. (2003. Appl. Organomet. Chem. 17, 881–882.], the SnIV atoms are able to formally complete their coordination by addition of dimethyl sulfoxide (DMSO molecules provided by the reaction medium, affording the title complex, [Sn2(C6H56(C2O4(C2H6OS2]. The SnIV atoms are then pentacoordinated, with a common trans trigonal–bipyramidal arrangement. The asymmetric unit contains one half-molecule, which is completed by inversion symmetry in space group type C2/c. The inversion centre is placed at the mid-point of the central bis-monodentate oxalate dianion, C2O42−, which bridges the [(SnPh3(DMSO] moieties. The molecule crystallizes as a disordered system, with two phenyl rings disordered by rotation about their Sn—C bonds, while the DMSO molecule is split over two positions due to a tetrahedral inversion at the S atom. All disordered parts were refined with occupancies fixed of 0.5.

  12. Reactivity of some S-bridge containing diphenyl derivatives (sulfides, sulfoxides, sulfones) towards ortho-positronium atoms in dimethylsulfoxide solution

    Levay, Bela [Department of Nuclear Chemistry, Eoetvoes Lorand University, Budapest (Hungary)], E-mail:; Szabo, Denes [Department of Organic Chemistry, Eoetvoes Lorand University, Budapest (Hungary)


    The effect of changes in the chemical structure of organic sulfur compounds on their reactivity towards an ortho-positronium (o-Ps) atom was investigated by positron annihilation lifetime spectroscopy in dimethylsulfoxide solutions. S-bridge containing molecules with very similar structural frameworks were selected as model systems, such as, diphenyl sulfide, sulfoxide and sulfone, and their derivatives. The effect of the type of the S-bridge on the reactivity increased in the order of S < SO < SO{sub 2} in all groups of the compounds with similar substituents on their phenyl groups. The same trend was observed for the calculated excess positive charge on the sulfur atoms and the LUMO energies of the molecules too. As it was expected, electron-withdrawing substituents on the aromatic rings increased both the reactivity and the negative values of the LUMO energy of the molecules (COOH < NO{sub 2}) whereas those with electron-donating character (CH{sub 3}O) showed the opposite effect.

  13. Identification of Aeromonas hydrophila Genes Preferentially Expressed after Phagocytosis by Tetrahymena and Involvement of Methionine Sulfoxide Reductases

    Pang, Maoda; Lin, Xiaoqin; Liu, Jin; Guo, Changming; Gao, Shanshan; Du, Hechao; Lu, Chengping; Liu, Yongjie


    Free-living protozoa affect the survival and virulence evolution of pathogens in the environment. In this study, we explored the fate of Aeromonas hydrophila when co-cultured with the bacteriovorous ciliate Tetrahymena thermophila and investigated bacterial gene expression associated with the co-culture. Virulent A. hydrophila strains were found to have ability to evade digestion in the vacuoles of this protozoan. In A. hydrophila, a total of 116 genes were identified as up-regulated following co-culture with T. thermophila by selective capture of transcribed sequences (SCOTS) and comparative dot-blot analysis. A large proportion of these genes (42/116) play a role in metabolism, and some of the genes have previously been characterized as required for bacterial survival and replication within macrophages. Then, we inactivated the genes encoding methionine sulfoxide reductases, msrA, and msrB, in A. hydrophila. Compared to the wild-type, the mutants ΔmsrA and ΔmsrAB displayed significantly reduced resistance to predation by T. thermophila, and 50% lethal dose (LD50) determinations in zebrafish demonstrated that both mutants were highly attenuated. This study forms a solid foundation for the study of mechanisms and implications of bacterial defenses. PMID:28083518

  14. Dimethyl Sulfoxide Induced Destabilization and Disassembly of Various Structural Variants of Insulin Fibrils Monitored by Vibrational Circular Dichroism.

    Zhang, Ge; Babenko, Viktoria; Dzwolak, Wojciech; Keiderling, Timothy A


    Dimethyl sulfoxide (DMSO) induced destabilization of insulin fibrils has been previously studied by Fourier transform infrared spectroscopy and interpreted in terms of secondary structural changes. The variation of this process for fibrils with different types of higher-order morphological structures remained unclear. Here, we utilize vibrational circular dichroism (VCD), which has been reported to provide a useful biophysical probe of the supramolecular chirality of amyloid fibrils, to characterize changes in the macroscopic chirality following DMSO-induced disassembly for two types of insulin fibrils formed under different conditions, at different reduced pH values with and without added salt and agitation. We confirm that very high concentrations of DMSO can disaggregate both types of insulin fibrils, which initially maintained a β-sheet conformation and eventually changed their secondary structure to a disordered form. The two types responded to varying concentrations of DMSO, and disaggregation followed different mechanisms. Interconversion of specific insulin fibril morphological types also occurred during the destabilization process as monitored by VCD. With transmission electron microscopy, we were able to correlate the changes in VCD sign patterns to alteration of morphology of the insulin fibrils.

  15. Myocyte Enhancer Factor 2C, an Osteoblast Transcription Factor Identified by Dimethyl Sulfoxide (DMSO)-enhanced Mineralization*

    Stephens, Alexandre S.; Stephens, Sebastien R.; Hobbs, Carl; Hutmacher, Deitmar W.; Bacic-Welsh, Desa; Woodruff, Maria Ann; Morrison, Nigel A.


    Rapid mineralization of cultured osteoblasts could be a useful characteristic in stem cell-mediated therapies for fracture and other orthopedic problems. Dimethyl sulfoxide (DMSO) is a small amphipathic solvent molecule capable of stimulating cell differentiation. We report that, in primary human osteoblasts, DMSO dose-dependently enhanced the expression of osteoblast differentiation markers alkaline phosphatase activity and extracellular matrix mineralization. Furthermore, similar DMSO-mediated mineralization enhancement was observed in primary osteoblast-like cells differentiated from mouse mesenchymal cells derived from fat, a promising source of starter cells for cell-based therapy. Using a convenient mouse pre-osteoblast model cell line MC3T3-E1, we further investigated this phenomenon showing that numerous osteoblast-expressed genes were elevated in response to DMSO treatment and correlated with enhanced mineralization. Myocyte enhancer factor 2c (Mef2c) was identified as the transcription factor most induced by DMSO, among the numerous DMSO-induced genes, suggesting a role for Mef2c in osteoblast gene regulation. Immunohistochemistry confirmed expression of Mef2c in osteoblast-like cells in mouse mandible, cortical, and trabecular bone. shRNAi-mediated Mef2c gene silencing resulted in defective osteoblast differentiation, decreased alkaline phosphatase activity, and matrix mineralization and knockdown of osteoblast specific gene expression, including osteocalcin and bone sialoprotein. A flow on knockdown of bone-specific transcription factors, Runx2 and osterix by shRNAi knockdown of Mef2c, suggests that Mef2c lies upstream of these two important factors in the cascade of gene expression in osteoblasts. PMID:21652706

  16. Myocyte enhancer factor 2c, an osteoblast transcription factor identified by dimethyl sulfoxide (DMSO)-enhanced mineralization.

    Stephens, Alexandre S; Stephens, Sebastien R; Hobbs, Carl; Hutmacher, Deitmar W; Bacic-Welsh, Desa; Woodruff, Maria Ann; Morrison, Nigel A


    Rapid mineralization of cultured osteoblasts could be a useful characteristic in stem cell-mediated therapies for fracture and other orthopedic problems. Dimethyl sulfoxide (DMSO) is a small amphipathic solvent molecule capable of stimulating cell differentiation. We report that, in primary human osteoblasts, DMSO dose-dependently enhanced the expression of osteoblast differentiation markers alkaline phosphatase activity and extracellular matrix mineralization. Furthermore, similar DMSO-mediated mineralization enhancement was observed in primary osteoblast-like cells differentiated from mouse mesenchymal cells derived from fat, a promising source of starter cells for cell-based therapy. Using a convenient mouse pre-osteoblast model cell line MC3T3-E1, we further investigated this phenomenon showing that numerous osteoblast-expressed genes were elevated in response to DMSO treatment and correlated with enhanced mineralization. Myocyte enhancer factor 2c (Mef2c) was identified as the transcription factor most induced by DMSO, among the numerous DMSO-induced genes, suggesting a role for Mef2c in osteoblast gene regulation. Immunohistochemistry confirmed expression of Mef2c in osteoblast-like cells in mouse mandible, cortical, and trabecular bone. shRNAi-mediated Mef2c gene silencing resulted in defective osteoblast differentiation, decreased alkaline phosphatase activity, and matrix mineralization and knockdown of osteoblast specific gene expression, including osteocalcin and bone sialoprotein. A flow on knockdown of bone-specific transcription factors, Runx2 and osterix by shRNAi knockdown of Mef2c, suggests that Mef2c lies upstream of these two important factors in the cascade of gene expression in osteoblasts.

  17. Regulatory effect of Dimethyl Sulfoxide (DMSO) on astrocytic reactivity in a murine model of cerebral infarction by arterial embolization.

    Lapuente Chala, Catalina; Rengifo Valbuena, Carlos Augusto; Avila Rodríguez, Marco Fidel; Céspedes Rubio, Angel


    The pathophysiology of cerebral ischemia is essential for early diagnosis, neurologic recovery, the early onset of drug treatment and the prognosis of ischemic events. Experimental models of cerebral ischemia can be used to evaluate the cellular response phenomena and possible neurological protection by drugs. To characterize the cellular changes in the neuronal population and astrocytic response by the effect of Dimethyl Sulfoxide (DMSO) on a model of ischemia caused by cerebral embolism. Twenty Wistar rats were divided into four groups (n= 5). The infarct was induced with α-bovine thrombin (40 NIH/Unit.). The treated group received 90 mg (100 μL) of DMSO in saline (1:1 v/v) intraperitoneally for 5 days; ischemic controls received only NaCl (placebo) and two non-ischemic groups (simulated) received NaCl and DMSO respectively. We evaluated the neuronal (anti-NeuN) and astrocytic immune-reactivity (anti-GFAP). The results were analyzed by densitometry (NIH Image J-Fiji 1.45 software) and analysis of variance (ANOVA) with the Graph pad software (Prism 5). Cerebral embolism induced reproducible and reliable lesions in the cortex and hippocampus (CA1)., similar to those of focal models. DMSO did not reverse the loss of post-ischemia neuronal immune-reactivity, but prevented the morphological damage of neurons, and significantly reduced astrocytic hyperactivity in the somato-sensory cortex and CA1 (p DMSO on astrocyte hyperreactivity and neuronal-astroglial cytoarchitecture , gives it potential neuroprotective properties for the treatment of thromboembolic cerebral ischemia in the acute phase.

  18. The effect of dimethyl sulfoxide (DMSO) on dentin bonding and nanoleakage of etch-and-rinse adhesives.

    Tjäderhane, Leo; Mehtälä, Pekka; Scaffa, Polliana; Vidal, Cristina; Pääkkönen, Virve; Breschi, Lorenzo; Hebling, Josimeri; Tay, Franklin R; Nascimento, Fabio D; Pashley, David H; Carrilho, Marcela R


    The objective was to examine the effect of a solvent dimethyl sulfoxide (DMSO) on resin-dentin bond durability, as well as potential functional mechanisms behind the effect. Microtensile bond strength (μTBS) was evaluated in extracted human teeth in two separate experiments. Dentin specimens were acid-etched and assigned to pre-treatment with 0.5mM (0.004%) DMSO as additional primer for 30s and to controls with water pre-treatment. Two-step etch-and-rinse adhesive (Scotchbond 1XT, 3M ESPE) was applied and resin composite build-ups were created. Specimens were immediately tested for μTBS or stored in artificial saliva for 6 and 12 months prior to testing. Additional immediate and 6-month specimens were examined for interfacial nanoleakage analysis under SEM. Matrix metalloproteinase (MMP) inhibition by DMSO was examined with gelatin zymography. Demineralized dentin disks were incubated in 100% DMSO to observe the optical clearing effect. The use of 0.5mM DMSO had no effect on immediate bond strength or nanoleakage. In controls, μTBS decreased significantly after storage, but increased significantly in DMSO-treated group. The control group had significantly lower μTBS than DMSO-group after 6 and 12 months. DMSO also eliminated the increase in nanoleakage seen in controls. 5% and higher DMSO concentrations significantly inhibited the gelatinases. DMSO induced optical clearing effect demonstrating collagen dissociation. DMSO as a solvent may be useful in improving the preservation of long-term dentin-adhesive bond strength. The effect may relate to dentinal enzyme inhibition or improved wetting of collagen by adhesives. The collagen dissociation required much higher DMSO concentrations than the 0.5mM DMSO used for bonding. Copyright © 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

  19. Dentin bond optimization using the dimethyl sulfoxide-wet bonding strategy: A 2-year in vitro study.

    Stape, Thiago Henrique Scarabello; Tjäderhane, Leo; Tezvergil-Mutluay, Arzu; Yanikian, Cristiane Rumi Fujiwara; Szesz, Anna Luiza; Loguercio, Alessandro Dourado; Martins, Luís Roberto Marcondes


    This study evaluated a new approach, named dimethyl sulfoxide (DMSO)-wet bonding, to produce more desirable long-term prospects for the ultrafine interactions between synthetic polymeric biomaterials and the inherently hydrated dentin substrate. Sound third molars were randomly restored with/without DMSO pretreatment using a total-etch (Scocthbond Multipurpose: SBMP) and a self-etch (Clearfil SE Bond: CF) adhesive systems. Restored teeth (n=10)/group were sectioned into sticks and submitted to different analyses: micro-Raman determined the degree of conversion inside the hybrid layer (DC); resin-dentin microtensile bond strength and fracture pattern analysis at 24h, 1year and 2 years of aging; and nanoleakage evaluation at 24h and 2 years. DMSO-wet bonding produced significantly higher 24h bond strengths for SBMP that were sustained over the two-year period, with significantly less adhesive failures. Similarly, DMSO-treated CF samples presented significantly higher bond strength than untreated samples at two years. Both adhesives had significant less adhesive failures at 2 years with DMSO. DMSO had no effect on DC of SBMP, but significantly increased the DC of CF. DMSO-treated SBMP samples presented reduced silver uptake compared to untreated samples after aging. Biomodification of the dentin substrate by the proposed strategy using DMSO is a suitable approach to produce more durable hybrid layers with superior ability to withstand hydrolytic degradation over time. Although the active role of DMSO on dentin bond improvement may vary according to monomer composition, its use seems to be effective on both self-etch and etch-and-rinse bonding mechanisms. Copyright © 2016 The Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

  20. Characterization of the chemical reactivity and nephrotoxicity of N-acetyl-S-(1,2-dichlorovinyl)-L-cysteine sulfoxide, a potential reactive metabolite of trichloroethylene.

    Irving, Roy M; Pinkerton, Marie E; Elfarra, Adnan A


    N-Acetyl-S-(1,2-dichlorovinyl)-L-cysteine (NA-DCVC) has been detected in the urine of humans exposed to trichloroethylene and its related sulfoxide, N-acetyl-S-(1,2-dichlorovinyl)-L-cysteine sulfoxide (NA-DCVCS), has been detected as hemoglobin adducts in blood of rats dosed with S-(1,2-dichlorovinyl)-L-cysteine (DCVC) or S-(1,2-dichlorovinyl)-L-cysteine sulfoxide (DCVCS). Because the in vivo nephrotoxicity of NA-DCVCS was unknown, in this study, male Sprague-Dawley rats were dosed (i.p.) with 230 μmol/kg b.w. NA-DCVCS or its potential precursors, DCVCS or NA-DCVC. At 24 h post treatment, rats given NA-DCVC or NA-DCVCS exhibited kidney lesions and effects on renal function distinct from those caused by DCVCS. NA-DCVC and NA-DCVCS primarily affected the cortico-medullary proximal tubules (S(2)-S(3) segments) while DCVCS primarily affected the outer cortical proximal tubules (S(1)-S(2) segments). When NA-DCVCS or DCVCS was incubated with GSH in phosphate buffer pH 7.4 at 37°C, the corresponding glutathione conjugates were detected, but NA-DCVC was not reactive with GSH. Because NA-DCVCS exhibited a longer half-life than DCVCS and addition of rat liver cytosol enhanced GSH conjugate formation, catalysis of GSH conjugate formation by the liver could explain the lower toxicity of NA-DCVCS in comparison with DCVCS. Collectively, these results provide clear evidence that NA-DCVCS formation could play a significant role in DCVC, NA-DCVC, and trichloroethylene nephrotoxicity. They also suggest a role for hepatic metabolism in the mechanism of NA-DCVC nephrotoxicity.

  1. 2-(5-Bromo-1H-indol-3-yl-4-(4-bromophenyl-5-(4-chlorobenzoyl-1H-pyrrole-3-carbonitrile dimethyl sulfoxide monosolvate

    Y. AaminaNaaz


    Full Text Available In the title solvated compound, C26H14Br2ClN3O·C2H6OS, the indole ring is inclined to the central pyrrole ring by 25.7 (2°. The chlorobenzene ring and the bromobenzene rings subtend dihedral angles of 56.5 (2 and 53.4 (2°, respectively, with the central pyrrole ring. In the crystal, molecules are bridged by N—H...O hydrogen bonds, involving the dimethyl sulfoxide solvent molecule, forming chains along [010]. There are no other significant intermolecular interactions present.

  2. (4-Hydr-oxy-2-oxidobenzaldehyde thio-semicarbazonato-κO,N,S)(1,10-phenanthroline-κN,N')zinc(II) dimethyl sulfoxide disolvate monohydrate.

    Tan, Kong Wai; Ng, Chew Hee; Maah, Mohd Jamil; Ng, Seik Weng


    The Zn(II) atom in the title compound, [Zn(C(8)H(7)N(3)O(2)S)(C(12)H(8)N(2))]·2C(2)H(6)OS·H(2)O, is N,N'-chelated by the N-heterocycle and N,O,S-chelated by the deprotonated Schiff base in a distorted square-pyramidal enviroment. Hydrogen bonds link the mononuclear mol-ecule, the water and the dimethyl sulfoxide (DMSO) mol-ecules into a linear chain motif. One DMSO mol-ecule is disordered over two positions in respect of the S atom in an approximate 1:1 ratio.

  3. Crystal structure of di-μ-isobutyrato-κ4O:O′-bis[cis-dichlorido(dimethyl sulfoxide-κSrhenium(III

    Alexander A. Golichenko


    Full Text Available The title compound, [Re2(C3H7COO2Cl4{(CH32SO}2], comprises binuclear complex molecules [Re—Re = 2.24502 (13 Å] involving cis-oriented double carboxylate bridges, four equatorial chloride ions and two weakly bonded O atoms from dimethyl sulfoxide ligands in the axial positions at the ReIII atoms. In the crystal, molecules are linked into corrugated layers parallel to (101 by very weak C—H...Cl and C—H...O hydrogen-bonding interactions. C—H...Cl hydrogen bonding provides the links between layers to consolidate a three-dimensional framework.

  4. Energetics and Dynamics of the Fragmentation Reactions of Protonated Peptides Containing Methionine Sulfoxide or Aspartic Acid via Energy- and Time-Resolved Surface Induced Dissociation

    Lioe, Hadi; Laskin, Julia; Reid, Gavin E.; O' Hair, Richard Aj


    The surface-induced dissociation (SID) of six model peptides containing either methionine sulfoxide or aspartic acid (GAILM(O)GAILR, GAILM(O)GAILK, GAILM(O)GAILA, GAILDGAILR, GAILDGAILK, and GAILDGAILA) have been studied using a specially configured Fourier transform ion-cyclotron resonance mass spectrometer (FT-ICR MS). In particular, we have investigated the energetics and dynamics associated with (i) preferential cleavage of the methionine sulfoxide side chain via the loss of CH3SOH (64Da), and (ii) preferential cleavage of the amide bond C-terminal to aspartic acid. The role of proton mobility on these selective bond cleavage reactions was examined by changing the C-terminal residue of the peptide from arginine (non-mobile proton conditions) to lysine (partially-mobile proton conditions) to alanine (mobile proton conditions). Time- and energy-resolved fragmentation efficiency curves (TFEC) reveals that selective cleavages due to the methionine sulfoxide and aspartic acid residues are characterized by slow fragmentation kinetics. RRKM modeling of the experimental data suggests that the slow kinetics is associated with large negative entropy effects and these may be due to the presence of rearrangements prior to fragmentation. It was found that the Arrhenius pre-exponential factor (A) for peptide fragmentations occurring via selective bond cleavages are 1–2 orders of magnitude lower than non-selective peptide fragmentation reactions, while the dissociation threshold (E0) is relatively invariant. This means that selective bond cleavage is kinetically disfavored compared to non-selective amide bond cleavage. It was also found that the energetics and dynamics for the preferential loss of CH3SOH from peptide ions containing methionine sulfoxide are very similar to selective C-terminal amide bond cleavage at the aspartic acid residue. These results suggest that while preferential cleavage can compete with amide bond cleavage energetically, dynamically, these

  5. Heat of Mixing and Solution of Dimethyl sulfoxide C2H6OS + C5H10O3 Diethyl carbonate (HMSD1111, LB4315_H)

    Cibulka, I.; Fontaine, J.-C.; Sosnkowska-Kehiaian, K.; Kehiaian, H. V.

    This document is part of Subvolume C 'Binary Liquid Systems of Nonelectrolytes III' of Volume 26 'Heats of Mixing, Vapor-Liquid Equilibrium, and Volumetric Properties of Mixtures and Solutions' of Landolt-Börnstein Group IV 'Physical Chemistry'. It contains the Chapter 'heat of Mixing and Solution of Dimethyl sulfoxide C2H6OS + C5H10O3 Diethyl carbonate (HMSD1111, LB4315_H)' providing data from direct low-pressure calorimetric measurement of molar excess enthalpy at variable mole fraction and constant temperature.

  6. Volumetric Properties of the Mixture Dimethyl sulfoxide C2H6OS + C5H10O3 Diethyl carbonate (VMSD1212, LB5137_V)

    Cibulka, I.; Fontaine, J.-C.; Sosnkowska-Kehiaian, K.; Kehiaian, H. V.

    This document is part of Subvolume C 'Binary Liquid Systems of Nonelectrolytes III' of Volume 26 'Heats of Mixing, Vapor-Liquid Equilibrium, and Volumetric Properties of Mixtures and Solutions' of Landolt-Börnstein Group IV 'Physical Chemistry'. It contains the Chapter 'Volumetric Properties of the Mixture Dimethyl sulfoxide C2H6OS + C5H10O3 Diethyl carbonate (VMSD1212, LB5137_V)' providing data by calculation of molar excess volume from low-pressure density measurements at variable mole fraction and constant temperature.

  7. Volumetric Properties of the Mixture Dimethyl sulfoxide C2H6OS + C5H10O3 Diethyl carbonate (VMSD1111, LB5134_V)

    Cibulka, I.; Fontaine, J.-C.; Sosnkowska-Kehiaian, K.; Kehiaian, H. V.

    This document is part of Subvolume C 'Binary Liquid Systems of Nonelectrolytes III' of Volume 26 'Heats of Mixing, Vapor-Liquid Equilibrium, and Volumetric Properties of Mixtures and Solutions' of Landolt-Börnstein Group IV 'Physical Chemistry'. It contains the Chapter 'Volumetric Properties of the Mixture Dimethyl sulfoxide C2H6OS + C5H10O3 Diethyl carbonate (VMSD1111, LB5134_V)' providing data from direct low-pressure measurement of mass density at variable mole fraction and constant temperature, in the single-phase region(s).

  8. Structural studies of the effect that dimethyl sulfoxide (DMSO) has on cisplatin and carboplatin binding to histidine in a protein.

    Tanley, Simon W M; Schreurs, Antoine M M; Kroon-Batenburg, Loes M J; Meredith, Joanne; Prendergast, Richard; Walsh, Danielle; Bryant, Patrick; Levy, Colin; Helliwell, John R


    The anticancer complexes cisplatin and carboplatin target the DNA major groove, forming intrastrand and interstrand cross-links between guanine bases through their N7 atoms, causing distortion of the DNA helix and apoptotic cell death. A major side effect of these drugs is toxicity, which is caused via binding to many proteins in the body. A range of crystallographic studies have been carried out involving the cocrystallization of hen egg-white lysozyme (HEWL) as a test protein with cisplatin and carboplatin in aqueous and dimethyl sulfoxide (DMSO) conditions. Different cryoprotectants, glycerol and Paratone, were used for each of the cisplatin and carboplatin cocrystallization cases, while silicone oil was used for studies involving N-acetylglucosamine (NAG). Both cisplatin and carboplatin do not bind to HEWL in aqueous media on the timescales of the conditions used here, but upon addition of DMSO two molecules of cisplatin or carboplatin bind either side of His15, which is the only His residue in lysozyme and is assumed to be an imidazolyl anion or a chemical resonance moiety, i.e. both imidazole N atoms are chemically reactive. To identify the platinum-peak positions in the 'with DMSO conditions', anomalous scattering maps were calculated as a cross-check with the F(o) - F(c) OMIT maps. Platinum-occupancy σ values were established using three different software programs in each case. The use of EVAL15 to process all of the diffraction data sets provided a consistent platform for a large ensemble of data sets for the various protein and platinum-compound model refinements with REFMAC5 and then SHELXTL. Overall, this extensive set of crystallization and cryoprotectant conditions allowed a systematic evaluation of cisplatin and carboplatin binding to lysozyme as a test protein via detailed X-ray crystal structure characterizations. DMSO is used as a super-solvent for drug delivery as it is deemed to cause no effect upon drug binding. However, these results show

  9. Comparative pharmacokinetics and bioavailability of albendazole sulfoxide in sheep and goats, and dose-dependent plasma disposition in goats.

    Aksit, Dilek; Yalinkilinc, Hande Sultan; Sekkin, Selim; Boyacioğlu, Murat; Cirak, Veli Yilgor; Ayaz, Erol; Gokbulut, Cengiz


    The aims of this study were to compare the pharmacokinetics of albendazole sulfoxide (ABZ-SO, ricobendazole) in goats and sheep at a dose of 5 g/kg bodyweight (BW), after intravenous (IV) and subcutaneous (SC) administrations, and to investigate the effects of increased doses (10 and 15 mg/kg BW) on the plasma disposition of ABZ-SO in goats following SC administration. A total of 16 goats (Capra aegagrus hircus, eight males and eight females) and 8 sheep (Ovis aries, four males and four females) 12-16 months old and weighing 20-32 kg, were used. The study was designed according to two-phase crossover study protocol. In Phase-1, eight sheep were assigned as Group I and 16 goats were allocated into two groups (Group II and Group III). ABZ-SO was applied to Group I (sheep) and Group II (goats) animals subcutaneously, and to Group III (goats) animals intravenously, all at a dose rate of 5 mg/kg BW. In Phase-2, the sheep in the Group I received ABZ-SO intravenously in a dose of 5 mg/kg BW; the goats in Group II and Group III received ABZ-SO subcutaneously at a dose of 10 mg/kg and 15 mg/kg BW, respectively. Blood samples were collected from the jugular vein at different times between 1 and 120 h after drug administrations. The plasma concentrations of ABZ-SO and its metabolites were analysed by high performance liquid chromatography. In goats, the area under the curve, terminal half-life and plasma persistence of ABZ-SO were significantly smaller and shorter, respectively, compared with those observed in sheep following both IV and SC administrations at a dose of 5 mg/kg BW. On the other side, dose-dependent plasma dispositions of ABZ-SO were observed following SC administration at increased doses (10 and 15 mg/kg) in goats. Consequently, ABZ-SO might be used at higher doses to provide higher plasma concentration and thus to achieve greater efficacy against the target parasites.

  10. Effect of the water content on the retention and enantioselectivity of albendazole and fenbendazole sulfoxides using amylose-based chiral stationary phases in organic-aqueous conditions.

    Materazzo, Sabrina; Carradori, Simone; Ferretti, Rosella; Gallinella, Bruno; Secci, Daniela; Cirilli, Roberto


    Four commercially available immobilized amylose-derived CSPs (Chiralpak IA-3, Chiralpak ID-3, Chiralpak IE-3 and Chiralpak IF-3) were used in the HPLC analysis of the chiral sulfoxides albendazole (ABZ-SO) and fenbendazole (FBZ-SO) and their in vivo sulfide precursor (ABZ and FBZ) and sulfone metabolite (ABZ-SO2 and FBZ-SO2) under organic-aqueous mode. U-shape retention maps, established by varying the water content in the acetonitrile- and ethanol-water mobile phases, were indicative of two retention mechanisms operating on the same CSP. The dual retention behavior of polysaccharide-based CSPs was exploited to design greener enantioselective and chemoselective separations in a short time frame. The enantiomers of ABZ-SO and FBZ-SO were baseline resolved with water-rich mobile phases (with the main component usually being 50-65% water in acetonitrile) on the IF-3 CSP and ethanol-water 100:5 mixture on the IA-3 and IE-3 CSPs. A simultaneous separation of ABZ (or FBZ), enantiomers of the corresponding sulfoxide and sulfone was achieved on the IA-3 using ethanol-water 100:60 (acetonitrile-water 100:100 for FBZ) as a mobile phase.

  11. An efficency of use phonophoresis with an ointment on the basis of chondroitin sulfate and dimetil sulfoxide at the treatment of patients with arthritis of knee joints

    Виктор Александрович Вишневский


    Full Text Available Osteoarthritis is a frequent disease in people especially of the mean and elderly age.Aim of research: the study of an efficiency of phonophoresis with an ointment on the basis of chondroitin sulfate and dimethyl sulfoxide at treatment of patients with osteoarthritis of knee joints in the outpatient setting.  Material and methods. Research was carried out by the clinical and laboratory examinations of 40 patients with osteoarthritis of knee joints in the outpatient setting.   Patients were distributed between the main and control group depending on an approach to treatment. Indicators before and after treatment in all patients were assessed on 2 scales: the scale of assessment of knee joints (on J.N. Insall et al 1976 - (7 points and 2 Oxford scale for knee joints (on W. Dawson et al, 1998 - (12 point. The level of oxyproline in daily urine was examined in all patients.Results and discussions. The degree of manifestation of pain syndrome, movement amplitude and an everyday motor activity are the parameters of an efficiency of treatment.Author noticed the more apparent efficiency of treatment in patients of the main group who underwent phonophoresis after rubbing an ointment on the basis of chondroitin sulfate in the region of injured knee joint.Disappearance of pains after 10 PhPh with an ointment on the basis of chondroitin sulfate and dimethyl sulfoxide was noticed in 6 (30% patients and diminution of pain intensity in 12 (60% patients. So the general efficiency of treatment is 90% in the main group in relation to 70% of general efficiency of treatment without use this ointment in the control group.Conclusions. 1. Phonophoresis with an ointment on the basis of chondroitin sulfate and dimethyl sulfoxide is a safe and rather effective method of treatment patients with osteoarthritis of knee joints of I-III radiographic stage, an efficiency of treatment is 90%.2. The use of phonophoresis with an ointment containing combination of chondroitin

  12. A Novel Catalytic Method for the Oxidation of Sulfides to Sulfoxides with Silica Sulfuric Acid and Sodium Nitrite in the Presence of KBr and/or NaBr as Catalyst



    Highly efficient selective oxidation of sulfides to sulfoxides by NaNO2 and silica sulfuric acid catalyzed with KBr or NaBr has been reported.This oxidation was carried out in the presence of wet SiO2(50% w/w)in acetonitrile at room temperature with good to excellent yields.

  13. Improved in situ saccharification of cellulose pretreated by dimethyl sulfoxide/ionic liquid using cellulase from a newly isolated Paenibacillus sp. LLZ1.

    Hu, Dongxue; Ju, Xin; Li, Liangzhi; Hu, Cuiying; Yan, Lishi; Wu, Tianyun; Fu, Jiaolong; Qin, Ming


    A cellulase producing strain was newly isolated from soil samples and identified as Paenibacillus sp. LLZ1. A novel aqueous-dimethyl sulfoxide (DMSO)/1-ethyl-3-methylimidazolium diethyl phosphate ([Emin]DEP)-cellulase system was designed and optimized. In the pretreatment, DMSO was found to be a low-cost substitute of up to 70% ionic liquid to enhance the cellulose dissolution. In the enzymatic saccharification, the optimum pH and temperature of the Paenibacillus sp. LLZ1 cellulase were identified as 6.0 and 40°C, respectively. Under the optimized reaction condition, the conversion of microcrystalline cellulose and bagasse cellulose increased by 39.3% and 37.6%, compared with unpretreated cellulose. Compared to current methods of saccharification, this new approach has several advantages including lower operating temperature, milder pH, and less usage of ionic liquid, indicating a marked progress in environmental friendly hydrolysis of biomass-based materials.

  14. 4-Amino-3-[2-(9H-carbazol-9-ylethyl]-1H-1,2,4-triazole-5(4H-thione dimethyl sulfoxide monosolvate

    Joel T. Mague


    Full Text Available In the crystal of the title compound, C16H15N5S·C2H6OS, both the 1,2,4-triazole derivative molecules and the disordered [refined occupancy ratio = 0.604 (1:0.396 (1] dimethyl sulfoxide solvent molecules form centrosymmetric dimers, by way of pairwise N—H...S and C—H...O hydrogen bonds, respectively. In the crystal, the two types of dimer are connected by N—H...O hydrogen bonds, forming infinite chains parallel to [101]. The packing is assisted by π–π stacking and C—H...π(ring and N—H...π(ring interactions.

  15. 3-[2-(9H-Carbazol-9-ylethyl]-4-phenyl-1H-1,2,4-triazole-5(4H-thione dimethyl sulfoxide monosolvate

    Shaaban K. Mohamed


    Full Text Available In the title compound, C22H18N4S·C2H6OS, the central triazolethione ring is inclined to the carbazole ring system by 13.97 (18° and to the phenyl ring by 66.4 (1°. The lattice solvent, dimethyl sulfoxide, is strongly hydrogen bonded to the triazolethione ring. In the crystal, the main molecules form columns parallel to the a axis, with the solvent molecules located between the columns. C—H...S hydrogen bonds and C—H...π(ring interactions link adjacent columns. The crystal studied was refined as a two-component twin, with a fractional contribution to the minor domain of 0.0742 (14.

  16. Low-molecular-weight carbohydrate Pentaisomaltose may replace dimethyl sulfoxide as a safer cryoprotectant for cryopreservation of peripheral blood stem cells

    Svalgaard, Jesper Dyrendom; Haastrup, Eva Kannik; Reckzeh, Kristian


    BACKGROUND: Cryopreserved hematopoietic stem cell products are widely used for certain hematologic malignancies. Dimethyl sulfoxide (DMSO) is the most widely used cryoprotective agent (CPA) today, but due to indications of cellular toxicity, changes of the cellular epigenetic state, and patient......-related side effects, there is an increasing demand for DMSO-free alternatives. We therefore investigated whether Pentaisomaltose (PIM), a low-molecular-weight carbohydrate (1 kDa), can be used for cryopreservation of peripheral blood stem cells, more specifically hematopoietic progenitor cell apheresis (HPC......(A)) product. STUDY DESIGN AND METHODS: We cryopreserved patient or donor HPC(A) products using 10% DMSO or 16% PIM and quantified the recovery of CD34+ cells and CD34+ subpopulations by multicolor flow cytometry. In addition, we compared the frequency of HPCs after DMSO and PIM cryopreservation using...

  17. Observed and calculated 1H and 13C chemical shifts induced by the in situ oxidation of model sulfides to sulfoxides and sulfones.

    Dracínský, Martin; Pohl, Radek; Slavetínská, Lenka; Budesínský, Milos


    A series of model sulfides was oxidized in the NMR sample tube to sulfoxides and sulfones by the stepwise addition of meta-chloroperbenzoic acid in deuterochloroform. Various methods of quantum chemical calculations have been tested to reproduce the observed (1)H and (13)C chemical shifts of the starting sulfides and their oxidation products. It has been shown that the determination of the energy-minimized conformation is a very important condition for obtaining realistic data in the subsequent calculation of the NMR chemical shifts. The correlation between calculated and observed chemical shifts is very good for carbon atoms (even for the 'cheap' DFT B3LYP/6-31G* method) and somewhat less satisfactory for hydrogen atoms. The calculated chemical shifts induced by oxidation (the Delta delta values) agree even better with the experimental values and can also be used to determine the oxidation state of the sulfur atom (-S-, -SO-, -SO(2)-).

  18. FTIR spectroscopic study of Li+ solvation in the solutions of LiBF4 in propylene carbonate, dimethyl sulfoxide, and their mixtures

    Zhang, Binbin; Li, Yantao; Hou, Baorong


    Ionic solvation in solutions of lithium tetrafluoroborate (LiBF4) in propylene carbonate (PC) + dimethyl sulfoxide (DMSO) mixtures has been studied using Fourier transformed infrared (FTIR) spectroscopy. Dimerization of DMSO molecules in the solutions was taken into account. The obtained results are discussed with respect to the electrolyte concentration and properties of the cations of the electrolyte. Band changes due to solvation interaction were detected in the region of the C=O stretching vibrations and ring deformation for PC, and the S=O stretching vibrations and C-S-C skeleton stretching modes for DMSO, indicating that there is a strong interaction between lithium cations and solvent molecules. In addition, Li+ was preferentially solvated by DMSO in these binary solvents as a result of the large difference in their donor number (DN) values. The structures of PC, DMSO, Li+-PC, Li+-DMSO, and Li+-PC+DMSO were given.

  19. Kinetics of proton transfer from tetra( m-trifluoromethylphenyl)dibenzotetraazaporphin to nitrogen-containing bases in a benzene-dimethyl sulfoxide system

    Petrov, O. A.


    The acid-base interaction between tetra( m-trifluoromethylphenyl)dibenzotetraazaporphin with pyridine, 2-methylpyridine, morpholine, piperidine, n-butylamine, diethylamine, and triethylamine is studied in the benzene-dimethyl sulfoxide system. It is found that intermolecular transfer of protons of NH-groups from of tetra( m-trifluoromethylphenyl)dibenzotetraazaporphin to n-butylamine and piperidine is characterized by unusually low values of the rate constants. The effect the structure of tetra( m-trifluoromethylphenyl)dibenzotetraazaporphin, hexa( m-trifluoromethylphenyl)benzotetraazaporphin, and octa( m-trifluoromethylphenyl)tetraazaporphin has on the kinetic parameters of acid-base interaction is demonstrated, along with that of the nature of the base and solvent. A structure is proposed for the charge-transfer complexes of the substituted tetraazaporphyrins. It is found that they undergo destruction over time.

  20. 惰性金属催化不对称硫醚氧化%The Oxidation of Chiral Sulfoxides Catalyzed by Inert Metals

    郭培江; 曾庆乐


    药物中多数使用的为低于50个原子组成的有机小分子,这些小分子中很多具有手性,药理作用是药物小分子通过与体内大分子之间严格手性匹配识别实现的。手性亚砜作为重要的手性中间体、手性配体、辅剂、催化剂和手性药物,光学纯度的手性亚砜是很多药物的活性基团,所以对潜手性的硫醚的不对称催化氧化以达到高光学纯度是具备重大意义的。本文对钛催化硫醚氧化及其相关体系作简要的介绍,然后再进一步介绍亚砜作为药物方面的应用。%Most of the drugs included less than 50 atoms among those small organic molecules, which had a large part of chirality. The pharmacology chiral sulfoxides strictly matched large molecules to realize its fuction. Chiral sulfox- ides was the important chiral intermediate, chiral ligands, auxiliary agents, catalysts and chiral drugs, so the high enanti- oselectivity sulfide oxidation meaned a lot. The progress of titanium - catalyzed enantioselective sulfide oxidation, and the application of chiral sulfoxide used medicines were introduced.

  1. Pharmacokinetics and tissue residues of hydrochloric acid albendazole sulfoxide and its metabolites in crucian carp (Carassius auratus) after oral administration.

    Li, Zaijian; Chen, Cuilan; Ai, Diyun; Wang, Chunmei; Li, Jing; Qi, Yuanhua; Yi, Weixue; Shen, Hongchun; Cao, Jiyue


    The pharmacokinetics and residues elimination of hydrochloric acid albendazole sulfoxide (ABZSO) and its metabolites were studied in healthy crucian carp (Carassius auratus, 250 ± 30 g) kept at water temperatures of 10 °C and 25 °C. The concentrations of ABZSO and its metabolites concentration in plasma and tissues were determined using high-performance liquid chromatography (HPLC) using an ultraviolet detector. The results revealed that the plasma concentration of ABZSO in plasma was significantly higher than that of albendazole sulfone (ABZSO(2)), whereas albendazole-2-aminosulfone (ABZ-SO(2)NH(2)) was not detected. The plasma concentrations of ABZSO and its main metabolite ABZSO(2) concentration-time data were fitted using a single-compartment model at 10 °C and 25 °C. The absorption half-life (t₁/₂ka) of ABZSO was 3.86 h at 10 °C and 1.29 h at 25 °C, whereas the elimination half-life (t₁/₂ke) was 16.34 h at 10 °C and 6.72 h at 25 °C; the maximum plasma concentration (C(max)) and the time-point of maximum plasma concentration (T(p)) were calculated as 3.20 μg mL(-1) and 10.58 h at 10 °C, 4.39 μg mL(-1) and 3.80 h at 25 °C. The distribution volume (V(d)/F) of ABZSO was estimated to be 1.99 L kg(-1) at 10 °C and 1.53 L kg(-1) at 25 °C; the total body clearance (CL(b)) of ABZSO were computed as 0.08 and 0.19 L/(h kg) at 10 and 25 °C, respectively; the areas under the concentration-time curve (AUC) was 118.22 μg mL(-1)h at 10 °C and 63.12 μg mL(-1)h at 25 °C. The [Formula: see text] of ABZSO(2) was found to be 6.39 °C at 10 °C and 3.73 h at 25 °C, whereas the [Formula: see text] was 12.86 h at 10 °C and 6.56 h at 25 °C; the C(max) and T(p) of ABZSO(2) was calculated as 0.78 μg mL(-1) and 12.82 h at 10 °C, 1.03 μg mL(-1) and 7.04 h at 25 °C, respectively; the V(d)/F of ABZSO(2) were estimated to be 6.43 L kg(-1) at 10 °C and 4.61 Lkg(-1) at 25 °C; the CL(b) of ABZSO(2) were computed as 0.34 and 0.49 L/(h kg) at 10 °C and 25

  2. Important roles of multiple Sp1 binding sites and epigenetic modifications in the regulation of the methionine sulfoxide reductase B1 (MsrB1 promoter

    Favaloro Bartolo


    Full Text Available Abstract Background Methionine sulfoxide reductases (Msrs are enzymes that catalyze the reduction of oxidized methionine residues. Most organisms that were genetically modified to lack the MsrA gene have shown shortening of their life span. Methionine sulfoxide reductases B (MsrB proteins codified by three separate genes, named MsrB1, MsrB2, and MsrB3, are included in the Msrs system. To date, the mechanisms responsible for the transcriptional regulation of MsrB genes have not been reported. The aim of this study was to investigate the regulation of MsrB1 selenoprotein levels through transcriptional regulation of the MsrB1 gene in MDA-MB231 and MCF-7 breast carcinoma cell lines. Results A MsrB1 gene promoter is located 169 base pairs upstream from the transcription start site. It contains three Sp1 binding sites which are sufficient for maximal promoter activity in transient transfection experiments. High levels of MsrB1 transcript, protein and promoter activity were detected in low metastatic MCF7 human breast cancer cells. On the contrary, very low levels of both MsrB1 transcript and promoter activity were detected in the highly metastatic counterpart MDA-MB231 cells. A pivotal role for Sp1 in the constitutive expression of the MsrB1 gene was demonstrated through transient expression of mutant MsrB1 promoter-reporter gene constructs and chromatin immunoprecipitation experiments. Since Sp1 is ubiquitously expressed, these sites, while necessary, are not sufficient to explain the patterns of gene expression of MsrB1 in various human breast cancer cells. MDA-MB231 cells can be induced to express MsrB1 by treatment with 5-Aza-2'-deoxycytidine, a demethylating agent. Therefore, the MsrB1 promoter is controlled by epigenetic modifications. Conclusion The results of this study provide the first insights into the transcriptional regulation of the human MsrB1 gene, including the discovery that the Sp1 transcription factor may play a central role in its

  3. Chemical stabilization of the polar fractions of petroleum for study by field ionization mass spectrometry. Study of the sulfoxides, quinolones and fluorenols in the most polar portion of the maltene fraction of Athabasca bitumen

    Montgomery, D.S.; Elbrink, C.


    A survey of the chemical types present in the polar fraction of Athabasca maltene revealed the presence of three prominent homologous series of sulfoxides, C/sub n/H sub 2n-2SO, C/sub n/H/sub 2n-4/SO and C/sub n/H/sub 2n-6/SO. The volatile members of these series have been studied to determine the chemical structure and stereochemistry of the leading members of the terpenoid sulfoxides to provide new series of biological markers for geothermal studies and compounds of more appropriate thermal stability to monitor new approaches to refining and upgrading. Of the three oxygen-containing homologous series found to be present, C/sub n/H/sub 2n-18/O, C/sub n/H/sub 2n-24/O and C/sub n/H/sub 2n-16/O, the volatile members belonging to the C/sub n/H/sub 2n-16/O were studied in detail and shown to consist of a series of fluorenols in which the substitutent in the 9 position extends out to C/sub 8/. Mass spectral evidence was also found for methyl substitution on the ring system. Of the various nitrogen- and oxygen-containing species, the elemental composition of the homologous series C/sub n/H/sub 2n-11/NO was confirmed by high resolution mass spectrometry and tentatively assigned to a series of quinolones. The concentration of these nitrogen compounds and the sulfoxides have been found to be extremely variable within the same oil sand quarry, reflecting subtle changes in the biological source material. No relation between the concentration of the acids and sulfoxides has been found which might be related to the oxygen potential of the water during the deposition of the bitumen. 9 refs., 76 figs., 3tabs.

  4. Design, Synthesis, Acaricidal/Insecticidal Activity, and Structure-Activity Relationship Studies of Novel Oxazolines Containing Sulfone/Sulfoxide Groups Based on the Sulfonylurea Receptor Protein-Binding Site.

    Yu, Xiuling; Liu, Yuxiu; Li, Yongqiang; Wang, Qingmin


    Enormous compounds containing sulfone/sulfoxide groups have been used in a variety of fields, especially in drug and pesticide design. To search for novel environmentally benign and ecologically safe pesticides with unique modes of action, a series of 2,4-diphenyl-1,3-oxazolines containing sulfone/sulfoxide groups as chitin synthesis inhibitors (CSIs) were designed and synthesized on the basis of the sulfonylurea receptor protein-binding site for CSIs. Their structures were characterized by (1)H and (13)C nuclear magnetic resonance and high-resolution mass spectrometry. The acaricidal and insecticidal activities of the new compounds were evaluated. It was found that most of the target compounds displayed wonderful acaricidal activities against spider mite (Tetranychus cinnabarinus) larvae and eggs. Especially compounds I-4, II-3, and II-4 displayed higher activities than commercial etoxazole at a concentration of 2.5 mg L(-1). Some target compounds exhibited insecticidal activities against lepidopteran pests. The present work demonstrated that these compounds containing sulfone/sulfoxide groups could be considered as potential candidates for the development of novel acaricides in the future.

  5. Crystal structure of bis­(bis­{μ3-3-methyl-3-[(4-nitro-2-oxido­benzyl­idene)amino]­propane-1,3-diolato}tris­[chlorido­(dimethyl sulfoxide)­iron(III)]) dimethyl sulfoxide hepta­solvate dihydrate

    Chygorin, Eduard; Smal, Yuri; Omelchenko, Irina V.


    The title compound, [Fe3(C11H11N2O5)2Cl3(C2H6OS)3]2·7C2H6OS·2H2O, was isolated accidentally from an Fe0–NiCl2·6H2O–H3 L–TEA–DMSO system [where H3 L is the product of the condensation between p-nitro­salicyl­aldehyde and 2-amino-2-methyl­propane-1,3-diol and dimethyl sulfoxide (DMSO), and TEA is triethylamine]. The structure is based on a trinuclear {Fe3(μ-O)4} core, with an angular arrangement of the FeIII ions that can be explained by the geometrical restrictions of two bulky ligands, each coordinating to all of the metal cations. PMID:27980847

  6. Second-harmonic generation microscopy used to evaluate the effect of the dimethyl sulfoxide in the cryopreservation process in collagen fibers of differentiated chondrocytes

    Andreoli-Risso, M. F.; Duarte, A. S. S.; Ribeiro, T. B.; Bordeaux-Rego, P.; Luzo, A.; Baratti, M. O.; Adur, J.; de Thomaz, A. A.; Pelegati, V. B.; Carvalho, H. F.; Cesar, C. L.; Kharmadayan, P.; Costa, F. F.; Olalla-Saad, S. T.


    Cartilaginous lesions are a significant public health problem and the use of adult stem cells represents a promising therapy for this condition. Cryopreservation confers many advantages for practitioners engaged in cell-based therapies. However, conventional slow freezing has always been associated with damage and mortality due to intracellular ice formation, cryoprotectant toxicity, and dehydration. The aim of this work is to observe the effect of the usual Dimethyl Sulfoxide (DMSO) cryopreservation process on the architecture of the collagen fiber network of chondrogenic cells from mesenchymal stem cells by Second Harmonic Generation (SHG) microscopy. To perform this study we used Mesenchymal Stem Cells (MSC) derived from adipose tissue which presents the capacity to differentiate into other lineages such as osteogenic, adipogenic and chondrogenic lineages. Mesenchymal stem cells obtained after liposuction were isolated digested by collagenase type I and characterization was carried out by differentiation of mesodermic lineages, and flow cytometry using specific markers. The isolated MSCs were cryopreserved by the DMSO technique and the chondrogenic differentiation was carried out using the micromass technique. We then compared the cryopreserved vs non-cryopreserved collagen fibers which are naturally formed during the differentiation process. We observed that noncryopreserved MSCs presented a directional trend in the collagen fibers formed which was absent in the cryopreserved MSCs. We confirmed this trend quantitatively by the aspect ratio obtained by Fast Fourier Transform which was 0.76 for cryopreserved and 0.52 for non-cryopreserved MSCs, a statistical significant difference.

  7. Nano-sized glass as an economically viable and eco-benign support to anchor heteropolyacids for green and sustainable chemoselective oxidation of sulfides to sulfoxides



    In this work, glass wastes were employed as cost-effective supports for the immobilization of phosphomolybdic acid (5–25 wt.% PMA) through an impregnation method. The highly efficient and retrievable nanocatalyst named nano-glass waste-supported phosphomolybdic acid (n-GW/PMA) was fully characterized by several techniques such as: XRD, FE-SEM, EDX, FT-IR and TGA. The catalytic performance of the assynthesized heterogeneous nanocatalystwas effectively investigated for the chemoselective oxidation of sulfides to sulfoxides in the presence of 30% H₂O₂ as an oxidant at room temperature under solvent-free condition. Optimization of the reaction conditions was performed by means of central composite design (CCD), which isone of the powerful response surface methodologies. Based on the results obtained under the optimum condition, the sample of 16 wt.% of PMA loading offered high conversion rates and yields (97%). Besides, the beneficialpoints of the prepared catalyst were its recoverability and reusability for several reaction cycles, low-cost and toxicity, easy availability and facile production.

  8. Efficacy of Diminazene Aceturate with and without Levamisole or Dimethyl Sulfoxide in Reducing Organ Weight and Parasitemia in T. congolense Infected Rats

    Eghianruwa, K.I.


    Full Text Available The efficacies of diminazene aceturate alone and in separate combinations with levamisole and Dimethyl Sulfoxide (DMSO in the treatment of T. congolense infection in rats were assessed on day 7 post infection and days 7 and 14 post treatment using changes in the weights and histology of the liver, spleen, heart and brain as well as parasitemia as parameters. Infected rats were treated with 7.0 mg/kg diminazene aceturate on day 7 post infection following which DMSO (0.5, 1.0 and 2.0 g/kg, respectively and levamisole (10, 20 and 40 mg/kg, respectively were administered as daily supplements to different groups of rats. Trypanosoma congolense only caused significant increase in spleen weight. There were no histopathological lesions in any organ. Infection had no effect on heart weight. Liver and spleen weights were lower in the diminazene group by day 7 Post Treatment (PT, but this situation was reversed by day 14 PT. Increase in the dose of DMSO caused increased liver weight. Diminazene/DMSO combination was more effective at 14 days PT in reducing spleen weight than treatment with diminazene alone. On the contrary, diminazene/levamisole combination was less effective than diminazene alone in reducing spleen weight. Parasites disappeared after diminazene treatment but reappeared only in the diminazene and levamisole groups by day 14 PT. Early relapse and high virulence of the Basa strainof T. congolense used may be responsible for the ineffectiveness of the three treatment protocols.

  9. Bis{μ-2,2′-[(3-azapentane-1,5-diylbis(nitrilomethylidyne]diphenolato}dicopper(II dimethyl sulfoxide disolvate

    Yasmi Reyes-Ortega


    Full Text Available The title compound, [Cu2(C18H19N3O22]·2C2H6OS or [Cu2(SalenN3H2]·2DMSO, where SalenN3H is the multidentate Schiff base 2,2′-[(3-azapentane-1,5-diylbis(nitrilomethylidyne]diphenolate dianion and DMSO is dimethyl sulfoxide, is a solvated dinuclear CuII complex. The neutral complex is built from two Cu(SalenN3H units related by an inversion center. All heteroatoms in the Schiff bases coordinate the CuII ions, which display highly distorted trigonal bipyramidal geometries. The solvent molecules are located in the structural voids of the complex and are disordered over two positions with occupancies of 0.642 (15 and 0.358 (15. The previously characterized acetone disolvate of the same complex presents identical molecular and crystal structures, and crystallizes with cell parameters very close to those of the DMSO disolvate reported here.

  10. Hydrothermal conversion of N-acetyl-d-glucosamine to 5-hydroxymethylfurfural using ionic liquid as a recycled catalyst in a water-dimethyl sulfoxide mixture.

    Zang, Hongjun; Yu, Songbai; Yu, Pengfei; Ding, Hongying; Du, Yannan; Yang, Yuchan; Zhang, Yiwen


    Here, N-acetyl-d-glucosamine (GlcNAc), the monomer composing the second most abundant biopolymer, chitin, was efficiently converted into 5-hydroxymethylfurfural (5-HMF) using ionic liquid (IL) catalysts in a water/dimethyl sulfoxide (DMSO) mixture solvent. Various reaction parameters, including reaction temperature and time, DMSO/water mass ratios and catalyst dosage were optimized. A series of ILs with different structures were analyzed to explore their impact on GlcNAc conversion. The substrate scope was expanded from GlcNAc to d-glucosamine, chitin, chitosan and monosaccharides, although 5-HMF yields obtained from polymers and other monosaccharides were generally lower than those from GlcNAc. Moreover, the IL N-methylimidazolium hydrogen sulfate ([Hmim][HSO4]) exhibited the best catalyst performance (64.6% yield) when GlcNAc was dehydrated in a DMSO/water mixture at 180 °C for 6 h without the addition of extra catalysts. To summarize, these results could provide knowledge essential to the production of valuable chemicals that are derived from renewable marine resources and benefit biofuel-related applications. Copyright © 2017 Elsevier Ltd. All rights reserved.

  11. Unscrambling micro-solvation of -COOH and -NH groups in neat dimethyl sulfoxide: insights from (1)H-NMR spectroscopy and computational studies.

    Takis, Panteleimon G; Papavasileiou, Konstantinos D; Peristeras, Loukas D; Boulougouris, Georgios C; Melissas, Vasilios S; Troganis, Anastassios N


    Dimethyl sulfoxide (DMSO) has a significant, multi-faceted role in medicine, pharmacy, and biology as well as in biophysical chemistry and catalysis. Its physical properties and impact on biomolecular structures still attract major scientific interest, especially the interactions of DMSO with biomolecular functional groups. In the present study, we shed light on the "isolated" carboxylic (-COOH) and amide (-NH) interactions in neat DMSO via(1)H NMR studies along with extensive theoretical approaches, i.e. molecular dynamics (MD) simulations, density functional theory (DFT), and ab initio calculations, applied on model compounds (i.e. acetic and benzoic acid, ethyl acetamidocyanoacetate). Both experimental and theoretical results show excellent agreement, thereby permitting the calculation of the association constants between the studied compounds and DMSO molecules. Our coupled MD simulations, DFT and ab initio calculations, and NMR spectroscopy results indicated that complex formation is entropically driven and DMSO molecules undergo multiple strong interactions with the studied molecules, particularly with the -COOH groups. The combined experimental and theoretical techniques unraveled the interactions of DMSO with the most abundant functional groups of peptides (i.e. peptide bonds, side chain and terminal carboxyl groups) in high detail, providing significant insights on the underlying thermodynamics driving these interactions. Moreover, the developed methodology for the analysis of the simulation results could serve as a template for future thermodynamic and kinetic studies of similar systems.

  12. Diclofenac sodium topical solution with dimethyl sulfoxide, a viable alternative to oral nonsteroidal anti-inflammatories in osteoarthritis: review of current evidence

    Fuller P


    Full Text Available Philip Fuller¹, Sanford Roth²¹Covidien, Hazelwood, MO; ²Arizona Research and Education, Arthritis Research Laboratory, Arizona State University, Phoenix, AZ, USAAbstract: Topical nonsteroidal anti-inflammatory drugs (NSAIDs may offer a safer alternative to their oral counterparts for the management of osteoarthritis. Diclofenac sodium topical solution with dimethyl sulfoxide (TDiclo was evaluated in five randomized, controlled trials and is indicated for treatment of the signs and symptoms associated with osteoarthritis of the knee. Three studies showed that TDiclo is superior to placebo and vehicle control with respect to pain, physical function, and perception of osteoarthritis symptoms. Two studies showed that benefits are similar to those of oral diclofenac, with one study demonstrating statistical equivalence. The most common adverse event associated with TDiclo in these studies was dry skin. Incidences of gastrointestinal adverse events and abnormal levels of liver enzymes were lower with TDiclo compared with oral diclofenac in active-controlled studies. Based on these studies, TDiclo represents a practical, evidence-based option for the management of osteoarthritis of the knee.Keywords: osteoarthritis, nonsteroidal anti-inflammatory drugs, diclofenac, topical analgesic

  13. One-Electron Oxidation of Methionine-Containing Dipeptides of Reverse Sequence: Sulfur versus Sulfoxide Characterized by IRMPD Spectroscopy and Static and Dynamics DFT Simulations.

    Gregori, Barbara; Guidoni, Leonardo; Crestoni, Maria Elisa; de Oliveira, Pedro; Houée-Levin, Chantal; Scuderi, Debora


    Gas-phase structural modifications induced by the oxidation of methionine of the two peptides of reverse sequence, methionine-valine (Met-Val) and valine-methionine (Val-Met), have been studied by mass-selected IR multiple photon dissociation (IRMPD) spectroscopy in the 800-2000 cm(-1) fingerprint range at the Centre Laser Infrarouge d'Orsay free-electron laser facility. The oxidation has been achieved by (•)OH radicals generated by γ radiolysis. IRMPD spectra were interpreted by static and harmonic DFT calculations and Born-Oppenheimer molecular dynamics simulations, which are employed to take into account all anharmonic and finite-temperature effects. The diagnostic signature of the sulfoxide group in the final products of Met-Val and Val-Met oxidations, which is missing in the spectra of native peptides, has been recorded. Evidence has also been gathered that a mixture of R and S isomers of close energies is formed. An interconversion between different isomers has been unveiled in the case of the oxidized Met-Val dipeptide.

  14. Carrier effects of dosing the h4iie cells with 3,3′,4,4tt´etrachlorobiphenyl (PCB77) in dimethyl sulfoxide or isooctane

    Yu, Kyung O.; Fisher, Jeff W.; Burton, G. Allen; Tillitt, Donald E.


    A rat hepatoma cell line, H4IIE serves as a bioassay tool to assess the potential toxicity of dioxin-like chemicals, including polychlorinated biphenyls (PCB) in environmental samples. PCB exposure to these cells induces cytochrome (CYP) P4501A1 activity in a dose-dependent fashion, thus allowing assessment of mixtures. The objective of this study was to determine the effect of different carriers, dimethyl sulfoxide (DMSO) and isooctane on the concentrations of PCBs in the H411E cells and induction of CYPIA1 activity as measured by ethoxyresorufm O-deethylase (EROD) activity. H4IIE cells were dosed with three micrograms of UL-14C-PCB77/ plate dissolved in DMSO or isooctane, and were harvested at sequential time periods for 4 days. PCB77 concentration and EROD activity were measured in the cells. EROD activity was greater when using DMSO as compared to isooctane, while there was no difference in the distribution of PCB77-derived radioactivities within the cell culture system based upon the carrier solvent used to deliver PCB77.

  15. Carrier effects of dosing the H4IIE cells with 3,3',4,4'-tetrachlorobiphenyl (PCB77) in dimethyl sulfoxide or isooctane.

    Yu, K O; Fisher, J W; Burton, G A; Tillitt, D E


    A rat hepatoma cell line, H4IIE, serves as a bioassay tool to assess the potential toxicity of dioxin-like chemicals, including polychlorinated biphenyls (PCB) in environmental samples. PCB exposure to these cells induces cytochrome (CYP) P4501A1 activity in a dose-dependent fashion, thus allowing assessment of mixtures. The objective of this study was to determine the effect of different carriers, dimethyl sulfoxide (DMSO) and isooctane on the concentrations of PCBs in the H4IIE cells and induction of CYP1A1 activity as measured by ethoxyresorufin O-deethylase (EROD) activity. H4IIE cells were dosed with three micrograms of UL-14C-PCB77/plate dissolved in DMSO or isooctane, and were harvested at sequential time periods for 4 days. PCB77 concentration and EROD activity were measured in the cells. EROD activity was greater when using DMSO as compared to isooctane, while there was no difference in the distribution of PCB77-derived radioactivities within the cell culture system based upon the carrier solvent used to deliver PCB77.

  16. Liquid chromatography--tandem mass spectrometry method for simultaneous determination of albendazole and albendazole sulfoxide in human plasma for bioequivalence studies

    Dhiraj M. Rathod


    Full Text Available An improved high performance liquid chromatography--tandem mass spectrometry (LC–MS/MS method has been developed for sensitive and rapid determination of albendazole (ABZ and its active metabolite, albendazole sulfoxide (ABZSO, in the positive ionization mode. The method utilized solid phase extraction (SPE for sample preparation of the analytes and their deuterated internal standards (ISs from 100 µL human plasma. The chromatography was carried out on Hypurity C18 column using acetonitrile-2.0 mM ammonium acetate, pH 5.0 (80:20, v/v as the mobile phase. The assay exhibited a linear response over the concentration range of 0.200–50.0 ng/mL for ABZ and 3.00–600 ng/mL for ABZSO. The recoveries of the analytes and ISs ranged from 86.03%–89.66% and 89.85%–98.94%, respectively. Matrix effect, expressed as IS-normalized matrix factors, ranged from 0.985 to 1.042 for the both analytes. The method was successfully applied for two separate studies in healthy subjects using single dose of 400 mg conventional tablets and 400 mg chewable ABZ tablets, respectively.

  17. Liquid chromatography-tandem mass spectrometry method for simultaneous determination of albendazole and albendazole sulfoxide in human plasma for bioequivalence studies$

    Dhiraj M. Rathod; Keyur R. Patel; Hiren N. Mistri; Arvind G. Jangid; Pranav S. Shrivastav; Mallika Sanyal


    An improved high performance liquid chromatography–tandem mass spectrometry (LC–MS/MS) method has been developed for sensitive and rapid determination of albendazole (ABZ) and its active metabolite, albendazole sulfoxide (ABZSO), in the positive ionization mode. The method utilized solid phase ex-traction (SPE) for sample preparation of the analytes and their deuterated internal standards (ISs) from 100 mL human plasma. The chromatography was carried out on Hypurity C18 column using acetonitrile-2.0 mM ammonium acetate, pH 5.0 (80:20, v/v) as the mobile phase. The assay exhibited a linear re-sponse over the concentration range of 0.200–50.0 ng/mL for ABZ and 3.00–600 ng/mL for ABZSO. The recoveries of the analytes and ISs ranged from 86.03%–89.66% and 89.85%–98.94%, respectively. Matrix effect, expressed as IS-normalized matrix factors, ranged from 0.985 to 1.042 for the both analytes. The method was successfully applied for two separate studies in healthy subjects using single dose of 400 mg conventional tablets and 400 mg chewable ABZ tablets, respectively.

  18. Ethyl 6-amino-5-cyano-4-phenyl-2,4-dihydropyrano[2,3-c]pyrazole-3-carboxylate dimethyl sulfoxide monosolvate

    Naresh Sharma


    Full Text Available In the asymmetric unit of the title compound, C16H14N4O3·C2H6OS, there are two independent main molecules (A and B and two dimethyl sulfoxide solvent molecules. In molecule A, the pyran ring is in a flattened sofa conformation, with the sp3-hydridized C atom forming the flap. In molecule B, the pyran ring is in a flattened boat conformation, with the sp3-hydridized C atom and the O atom deviating by 0.073 (3 and 0.055 (3 Å, respectively, from the plane of the other four atoms. The mean planes the pyrazole and phenyl rings form dihedral angles of 84.4 (2 and 84.9 (2°, respectively, for molecules A and B. In the crystal, N—H...O and N—H...N hydrogen bonds link the components of the structure into chains along [010]. In both solvent molecules, the S atoms are disordered over two sites, with occupancy ratios of 0.679 (4:0.321 (4 and 0.546 (6:0.454 (6.

  19. Fullerenol C{sub 60}(OH){sub 24} nanoparticles decrease relaxing effects of dimethyl sulfoxide on rat uterus spontaneous contraction

    Slavic, Marija, E-mail: [University of Belgrade, Department for Physiology, Institute for Biological Research ' Sinisa Stankovic' (IBISS) (Serbia); Djordjevic, Aleksandar [University of Novi Sad, Department of Chemistry, Biochemistry and the Environment, Faculty of Sciences (Serbia); Radojicic, Ratko [University of Belgrade, Faculty of Biology (Serbia); Milovanovic, Slobodan [University of East Sarajevo, Department of Pharmacology, Faculty of Medicine at Foca (Bosnia and Herzegowina); Orescanin-Dusic, Zorana [University of Belgrade, Department for Physiology, Institute for Biological Research ' Sinisa Stankovic' (IBISS) (Serbia); Rakocevic, Zlatko [University of Belgrade, Institute for Nuclear Sciences ' Vinca' (Serbia); Spasic, Mihajlo B.; Blagojevic, Dusko [University of Belgrade, Department for Physiology, Institute for Biological Research ' Sinisa Stankovic' (IBISS) (Serbia)


    Dimethyl sulfoxide (DMSO) is a widely used solvent and cryoprotectant that can cause impaired blood flow, reduction in intracranial pressure, tissue edema, inflammatory reactions, inhibition of vascular smooth muscle cell migration and proliferation, processes which can lead to atherosclerosis of the coronary, peripheral and cerebral circulation. Although the adverse effects are rare when DMSO is administered in clinically established concentrations, there is no safe antagonist for an overdose. In this work, we treated isolated spontaneous and calcium-induced contractile active rat uteri (Wistar, virgo intacta), with DMSO and fullerenol C{sub 60}(OH){sub 24} nanoparticle (FNP) in DMSO. FNP is a water-soluble derivative of fullerene C{sub 60}. Its size is a 1.1 nm in diameter and is a very promising candidate for a drug carrier in nanomedicine. FNP also displays free radical scavenging activity. DMSO decreased both spontaneous and calcium-induced contractions. In contrast, FNP only decreased spontaneous contraction. FNP decreased copper-zinc superoxide dismutase activity and prevented the DMSO-induced increase in glutathione reductase activity. Atomic force microscopy detected that FNP aggregated with calcium ions. Our results indicate that FNP has properties that make it a good candidate to be a modulator of DMSO activity which could minimize side effects of the latter.

  20. Use of two-dimensional fluorescence spectroscopy for monitoring of the effect of dimethyl sulfoxide on the growth and viability of immobilized plant cells

    Vankova Radomira


    Full Text Available The growth and viability of tobacco cells (Nicotiana tabacum L immobilized in alginate or pectate were monitored during their cultivation by using two-dimensional fluorescence spectroscopy (2-D FS. The cell growth was followed via the fluorescence of amino acids in proteins. The correlation between the tryptophan fluorescence and the cell biomass inside the alginate beads was verified by comparison with the dry weight of the cells. The determination of biomass content or cell viability by measurement of the intensity of NAD(PH fluorescence was found unsuitable. Cell viability was estimated by determination of cell esterase activity using fluorescein diacetate as a fluorogenic substrate. The fluorescence intensities of both fluorophores, tryptophan and fluorescein, were determined by scanning a 2-D FS spectrum of intact beads in front face cuvette. Using this technique the effect of organic solvent, dimethyl sulfoxide, on the growth and metabolic activities of cells within the beads was evaluated. While 4% DMSO was tolerated by cells, 6% DMSO led to the cell destruction.

  1. Efficient proliferation and maturation of fetal liver cells in three-dimensional culture by stimulation of oncostatin M, epidermal growth factor, and dimethyl sulfoxide.

    Koyama, Toshie; Ehashi, Tomo; Ohshima, Norio; Miyoshi, Hirotoshi


    For the purpose of applying fetal liver cells (FLCs) as a cell source to tissue-engineered bioartificial livers, three-dimensional (3-D) cultures of FLCs using a porous polymer scaffold, as well as monolayer cultures as a control, were simultaneously performed. To achieve efficient growth and differentiation, the FLCs were cultured in the growth medium for the first 3 weeks and then cultured in the differentiation medium for 3 more weeks. In these cultures, stimulating factors (oncostatin M (OSM), epidermal growth factor (EGF), hepatocyte growth factor (HGF), or dimethyl sulfoxide (DMSO)) were added to the media, and their effects were examined. When the growth medium containing OSM and EGF was used, EGF stimulated the growth of FLCs synergistically with OSM. For the differentiation of FLCs into mature hepatocytes, DMSO added to the differentiation medium remarkably enhanced albumin secretion in the 3-D and monolayer cultures, although HGF was effective only in the monolayer culture. Microscopic observation proved that FLCs exhibited hepatocyte-like morphology only in the media containing DMSO. In conclusion, successive supply of the growth medium containing EGF and OSM and the differentiation medium containing DMSO efficiently induced the growth of the 3-D cultured FLCs and their differentiation into mature hepatocytes.

  2. Carboxymethyl Cellulose (CMC) from Oil Palm Empty Fruit Bunch (OPEFB) in the new solvent Dimethyl Sulfoxide (DMSO)/Tetrabutylammonium Fluoride (TBAF)

    Eliza, M. Y.; Shahruddin, M.; Noormaziah, J.; Rosli, W. D. Wan


    The surplus of Oil Palm is the most galore wastes in Malaysia because it produced about half of the world palm oil production, which contributes a major disposal problem Synthesis from an empty fruit bunch produced products such as Carboxymethyl Cellulose (CMC), could apply in diverse application such as for paper coating, food packaging and most recently, the potential as biomaterials has been revealed. In this study, CMC was prepared by firstly dissolved the bleached pulp from OPEFB in mixture solution of dimethyl sulfoxide(DMSO)/tetrabutylammonium fluoride (TBAF) without any prior chemical modification. It took only 30 minutes to fully dissolve at temperature 60°C before sodium hydroxide (NaOH) were added for activation and monochloroacetateas terrifying agent. The final product is appeared in white powder, which is then will be analyzedby FTIR analysis. FTIR results show peaks appeared at wavenumber between 1609 cm-1 to 1614 cm-1 proved the existence of carboxymethyl groups which substitute OH groups at anhydroglucose(AGU) unit. As a conclusion, mixture solution of DMSO/TBAF is the suitable solvent used for dissolved cellulose before modifying it into CMC with higher Degree of Substitution (DS). Furthermore, the dissolution of the OPEFB bleached pulp was easy, simple and at a faster rate without prior chemical modification at temperature as low as 60°C.

  3. Increasing the energy density of the non-aqueous vanadium redox flow battery with the acetonitrile-1,3-dioxolane-dimethyl sulfoxide solvent mixture

    Herr, T.; Fischer, P.; Tübke, J.; Pinkwart, K.; Elsner, P.


    Different solvent mixtures were investigated for non-aqueous vanadium acetylacetonate (V(acac)3) redox flow batteries with tetrabutylammonium hexafluorophosphate as the supporting electrolyte. The aim of this study was to increase the energy density of the non-aqueous redox flow battery. A mixture of acetonitrile, dimethyl sulfoxide and 1-3-dioxolane nearly doubles the solubility of the active species. The proposed electrolyte system was characterized by Raman and FT-IR spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy and charge-discharge set-up. Spectroscopic methods were applied to understand the interactions between the solvents used and their impact on the solubility. The potential difference between oxidation and reduction of V(acac)3 measured by cyclic voltammetry was about 2.2 V. Impedance spectroscopy showed an electrolyte resistance of about 2400 Ω cm2. Experiments in a charge-discharge test cell achieved coulombic and energy efficiencies of ∼95% and ∼27% respectively. The highest discharge power density was 0.25 mW cm-2.

  4. A contribution to the controversy over dimethyl sulfoxide toxicity: anesthesia monitoring results in patients treated with Onyx embolization for intracranial aneurysms

    Pamuk, A.G.; Aypar, U. [Hacettepe University Hospital, Department of Anesthesia, Sihhiye, Ankara (Turkey); Saatci, I.; Cekirge, H.S. [Hacettepe University Hospital, Department of Radiology, Ankara (Turkey)


    Onyx injection is a new technique for embolization of cerebral aneurysms that is involved in a controversy about the 'toxicity' of its solvent, dimethyl sulfoxide (DMSO). We retrospectively studied 38 patients treated for aneurysms with the liquid polymer, Onyx. Induction was with propofol, fentanyl and vecuronium, and anesthesia was maintained with isoflurane in O{sub 2} and N{sub 2}O. The patients were given 500 ml of fluid after induction, and bradycardia was prevented in order to keep patients hyperdynamic. Electrocardiography (ECG), non-invasive blood pressure (NIBP), pulse oximetry, core temperatures, invasive blood pressure (BP), etCO{sub 2}, and urine output were monitored throughout the intervention. Heart rate and BP changes in response to balloon inflation, DMSO injection, Onyx injection and balloon deflation were recorded. The patients were followed with serial neurological examinations, computerized tomography and/or magnetic resonance imaging postoperatively for evidence of any neurological injury. Cumulative DMSO doses were always well under previously implicated doses for systemic toxicity. No changes implicating toxic reactions were observed during DMSO and Onyx injections. Balloon-induced changes returned to baseline within 1 min of balloon deflation. Technique-related permanent morbidity occurred in two patients (worsening of cranial nerve palsies in one and monocular blindness in another) and intracranial hemorrhage with resulting death in one patient. All patients showed a tendency to oxygen desaturation, but this finding did not cause any clinical consequence. Anesthesiologists need to be vigilant in monitoring patients treated with techniques that are new or are being developed. We have seen no evidence of toxicity or any anesthetic complications in our group of patients, our only clinical concern being a tendency to oxygen desaturation, which may be explained by the inhalational elimination of DMSO. (orig.)

  5. Combination of retinoic acid, dimethyl sulfoxide and 5-azacytidine promotes cardiac differentiation of human fetal liver-derived mesenchymal stem cells.

    Deng, Fuxue; Lei, Han; Hu, Yunfeng; He, Linjing; Fu, Hang; Feng, Rui; Feng, Panpan; Huang, Wei; Wang, Xi; Chang, Jing


    There are controversial reports about cardiac differentiation potential of mesenchymal stem cells (MSCs), and there is still no well-defined protocol for the induction of cardiac differentiation. The effects of retinoic acid (RA) and dimethyl sulfoxide (DMSO) on the proliferation and differentiation of human fetal liver-derived MSCs (HFMSCs) as well as the pluripotent state induced by 5-azacytidine (5-aza) in vitro were investigated. MSCs were isolated from fetal livers and cultured in accordance with previous reports. Cells were plated and were treated for 24 h by the combination of 5-aza, RA and DMSO in different doses. Different culture conditions were tested in our study, including temperature, oxygen content and medium. Three weeks later, cells were harvested for the certification of cardiac differentiation as well as the pluripotency, which indicated by cardiac markers and Oct4. It was found that the cardiac differentiation was only induced when HFMSCs were treated in the following conditions: in high-dose combination (5-aza 50 μM + RA 10(-1) μM + DMSO 1 %) in cardiac differentiation medium at 37 °C and 20 % O2. The results of immunohistochemistry and quantitative RT-PCR showed that about 40 % of the cells positively expressed Nkx2.5, desmin and cardiac troponin I, as well as Oct4. No beating cells were observed during the period. The combined treatment with RA, DMSO and 5-aza in high-dose could promote HFMSCs to differentiate into cardiomyocyte-like cells and possibly through the change of their pluripotent state.

  6. Efficacy and safety of topical diclofenac containing dimethyl sulfoxide (DMSO) compared with those of topical placebo, DMSO vehicle and oral diclofenac for knee osteoarthritis.

    Simon, Lee S; Grierson, Lisa M; Naseer, Zahid; Bookman, Arthur A M; Zev Shainhouse, J


    While topical non-steroidal anti-inflammatory drugs are considered safe, their long-term efficacy for osteoarthritis has been suspect. We conducted a 12-week, double-blind, double-dummy, randomized controlled trial of topical diclofenac (TDiclo) in a vehicle solution containing dimethyl sulfoxide (DMSO) in 775 subjects with radiologically confirmed, symptomatic primary osteoarthritis of the knee. This 5-arm study compared TDiclo with a placebo solution, the DMSO vehicle, oral diclofenac (ODiclo) and the combination of TDiclo+ODiclo for relieving the signs and symptoms of knee osteoarthritis. Subjects applied study solution, 40 drops four times daily, and took one study tablet daily for 12 weeks. Co-primary efficacy variables were WOMAC pain and physical function and a patient overall health assessment. Secondary variables were WOMAC stiffness and patient global assessment (PGA) of the knee osteoarthritis. TDiclo was superior to placebo for pain (-6.0 vs. -4.7, P=0.015), physical function (-15.8 vs. -12.3, P=0.034), overall health (-0.95 vs. -0.37, PDMSO vehicle for all efficacy variables. No significant difference was observed between DMSO vehicle and placebo or between TDiclo and ODiclo. The commonest adverse event associated with TDiclo was dry skin (18.2%). Fewer digestive system and laboratory abnormalities were observed with TDiclo than with ODiclo. Addition of TDiclo to ODiclo did not increase the incidence of systemic adverse events. TDiclo in DMSO vehicle is an effective treatment option for knee osteoarthritis with efficacy similar to, but tolerability better than ODiclo. DMSO vehicle was no more efficacious than placebo.

  7. Dimethyl Sulfoxide (DMSO) Increases Percentage of CXCR4(+) Hematopoietic Stem/Progenitor Cells, Their Responsiveness to an SDF-1 Gradient, Homing Capacities, and Survival.

    Jarocha, Danuta; Zuba-Surma, Ewa; Majka, Marcin


    Cryopreservation of bone marrow (BM), mobilized peripheral blood (mPB), and cord blood (CB) hematopoietic stem/progenitor cells (HSPCs) is a routine procedure before transplantation. The most commonly used cryoprotectant for HSPCs is dimethyl sulfoxide (DMSO). The objective of this study was to evaluate the influence of DMSO on surface receptor expression and chemotactic activities of HSPCs. We found that 10 min of incubation of human mononuclear cells (MNCs) with 10% DMSO significantly increases the percentage of CXCR4(+), CD38(+), and CD34(+) cells, resulting in an increase of CD34(+), CD34(+)CXCR4(+), and CD34(+)CXCR4(+)CD38(-) subpopulations. Furthermore, DMSO significantly increased chemotactic responsiveness of MNCs and CXCR4(+) human hematopoietic Jurkat cell line to a stromal cell-derived factor-1 (SDF-1) gradient. Furthermore, we demonstrated enhanced chemotaxis of human clonogenic progenitor cells to an SDF-1 gradient, which suggests that DMSO directly enhances the chemotactic responsiveness of early human progenitors. DMSO preincubation also caused lower internalization of the CXCR4 receptor. In parallel experiments, we found that approximately 30% more of DMSO-preincubated human CD45(+) and CD45(+)CD34(+) cells homed to the mouse BM 24 h after transplantation in comparison to control cells. Finally, we demonstrated considerably higher (25 days) survival of mice transplanted with DMSO-exposed MNCs than those transplanted with the control cells. We show in this study an unexpected beneficial influence of DMSO on HSPC homing and suggest that a short priming with DMSO before transplantation could be considered a new strategy to enhance cell homing and engraftment.

  8. A long-term, open-label study to confirm the safety of topical diclofenac solution containing dimethyl sulfoxide in the treatment of the osteoarthritic knee.

    Shainhouse, J Zev; Grierson, Lisa M; Naseer, Zahid


    To assess the long-term safety of a topical solution of diclofenac sodium in a vehicle containing dimethyl sulfoxide (TDiclo), subjects with radiologically confirmed, symptomatic osteoarthritis of the knee(s) applied the clinical dose of TDiclo (40 drops, four times daily) to each painful knee for up to 52 weeks. Safety assessment included adverse events, skin irritation scores of the treated knee(s), ocular examinations, and routine laboratory tests. There were 793 subjects (mean age, 62.5 years) who applied TDiclo to one or both (72%) knees for an average of 204 days, including 463 subjects for 6 months and 144 for 1 year. The most frequent adverse events were at the application site with no increase in incidence with prolonged exposure: dry skin (25.3%), contact dermatitis without vesicles (13.0%) or with vesicles (9.5%). Skin irritation score was 0 (normal) in 61.0% of subjects, 0.5 (dryness or flaking) in 23.9%, 1 or 2 (erythema without or with induration) in 6.9%, and 3 or 4 (erythema with induration and vesicles/bullae) in 8.2%. Subject dropouts included 114 (14.4%) with an application site skin adverse event. Individual subject laboratory test shift to abnormal occurred for hemoglobin (3.2%), aspartate aminotransferase (6.4%), alanine aminotransferase (7.3%), and creatinine (4.2%), but few shifts (less than 0.3% per variable) were clinically significant. No increased risk of cardiovascular or cataract events was noted. This long-term study of TDiclo revealed a safety profile comparable to that shown in multiple, shorter, well-controlled, double-blind trials with the predominant adverse effect noted being an application site reaction.

  9. A Two-component NADPH Oxidase (NOX)-like System in Bacteria Is Involved in the Electron Transfer Chain to the Methionine Sulfoxide Reductase MsrP.

    Juillan-Binard, Céline; Picciocchi, Antoine; Andrieu, Jean-Pierre; Dupuy, Jerome; Petit-Hartlein, Isabelle; Caux-Thang, Christelle; Vivès, Corinne; Nivière, Vincent; Fieschi, Franck


    MsrPQ is a newly identified methionine sulfoxide reductase system found in bacteria, which appears to be specifically involved in the repair of periplasmic proteins oxidized by hypochlorous acid. It involves two proteins: a periplasmic one, MsrP, previously named YedY, carrying out the Msr activity, and MsrQ, an integral b-type heme membrane-spanning protein, which acts as the specific electron donor to MsrP. MsrQ, previously named YedZ, was mainly characterized by bioinformatics as a member of the FRD superfamily of heme-containing membrane proteins, which include the NADPH oxidase proteins (NOX/DUOX). Here we report a detailed biochemical characterization of the MsrQ protein from Escherichia coli We optimized conditions for the overexpression and membrane solubilization of an MsrQ-GFP fusion and set up a purification scheme allowing the production of pure MsrQ. Combining UV-visible spectroscopy, heme quantification, and site-directed mutagenesis of histidine residues, we demonstrated that MsrQ is able to bind two b-type hemes through the histidine residues conserved between the MsrQ and NOX protein families. In addition, we identify the E. coli flavin reductase Fre, which is related to the dehydrogenase domain of eukaryotic NOX enzymes, as an efficient cytosolic electron donor to the MsrQ heme moieties. Cross-linking experiments as well as surface Plasmon resonance showed that Fre interacts with MsrQ to form a specific complex. Taken together, these data support the identification of the first prokaryotic two-component protein system related to the eukaryotic NOX family and involved in the reduction of periplasmic oxidized proteins.

  10. Cluster-continuum quasichemical theory calculation of the lithium ion solvation in water, acetonitrile and dimethyl sulfoxide: an absolute single-ion solvation free energy scale.

    Carvalho, Nathalia F; Pliego, Josefredo R


    Absolute single-ion solvation free energy is a very useful property for understanding solution phase chemistry. The real solvation free energy of an ion depends on its interaction with the solvent molecules and on the net potential inside the solute cavity. The tetraphenyl arsonium-tetraphenyl borate (TATB) assumption as well as the cluster-continuum quasichemical theory (CC-QCT) approach for Li(+) solvation allows access to a solvation scale excluding the net potential. We have determined this free energy scale investigating the solvation of the lithium ion in water (H2O), acetonitrile (CH3CN) and dimethyl sulfoxide (DMSO) solvents via the CC-QCT approach. Our calculations at the MP2 and MP4 levels with basis sets up to the QZVPP+diff quality, and including solvation of the clusters and solvent molecules by the dielectric continuum SMD method, predict the solvation free energy of Li(+) as -116.1, -120.6 and -123.6 kcal mol(-1) in H2O, CH3CN and DMSO solvents, respectively (1 mol L(-1) standard state). These values are compatible with the solvation free energy of the proton of -253.4, -253.2 and -261.1 kcal mol(-1) in H2O, CH3CN and DMSO solvents, respectively. Deviations from the experimental TATB scale are only 1.3 kcal mol(-1) in H2O and 1.8 kcal mol(-1) in DMSO solvents. However, in the case of CH3CN, the deviation reaches a value of 9.2 kcal mol(-1). The present study suggests that the experimental TATB scale is inconsistent for CH3CN. A total of 125 values of the solvation free energy of ions in these three solvents were obtained. These new data should be useful for the development of theoretical solvation models.

  11. Dimethyl sulfoxide inhibits spontaneous diabetes and autoimmune recurrence in non-obese diabetic mice by inducing differentiation of regulatory T cells

    Lin, Gu-Jiun [Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan, ROC (China); Sytwu, Huey-Kang [Department of Microbiology and Immunology, National Defense Medical Center, Taipei, Taiwan, ROC (China); Yu, Jyh-Cherng [Department of General Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC (China); Chen, Yuan-Wu [School of Dentistry, National Defense Medical Center, Taipei, Taiwan, ROC (China); Department of Oral and Maxillofacial Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC (China); Kuo, Yu-Liang [Department of Medical Imaging, Chung Shan Medical University Hospital, Taichung, Taiwan, ROC (China); School of Medical Imaging and Radiological Sciences, Chung Shan Medical University, Taichung, Taiwan, ROC (China); Yu, Chiao-Chi [Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan, ROC (China); Department of General Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC (China); Chang, Hao-Ming; Chan, De-Chuan [Department of General Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC (China); Huang, Shing-Hwa, E-mail: [Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan, ROC (China); Department of General Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC (China)


    Type 1 diabetes mellitus (T1D) is caused by the destruction of insulin-producing β cells in pancreatic islets by autoimmune T cells. Islet transplantation has been established as an effective therapeutic strategy for T1D. However, the survival of islet grafts can be disrupted by recurrent autoimmunity. Dimethyl sulfoxide (DMSO) is a solvent for organic and inorganic substances and an organ-conserving agent used in solid organ transplantations. DMSO also exerts anti-inflammatory, reactive oxygen species scavenger and immunomodulatory effects and therefore exhibits therapeutic potential for the treatment of several human inflammatory diseases. In this study, we investigated the therapeutic potential of DMSO in the inhibition of autoimmunity. We treated an animal model of islet transplantation (NOD mice) with DMSO. The survival of the syngeneic islet grafts was significantly prolonged. The population numbers of CD8, DC and Th1 cells were decreased, and regulatory T (Treg) cell numbers were increased in recipients. The expression levels of IFN-γ and proliferation of T cells were also reduced following DMSO treatment. Furthermore, the differentiation of Treg cells from naive CD4 T cells was significantly increased in the in vitro study. Our results demonstrate for the first time that in vivo DMSO treatment suppresses spontaneous diabetes and autoimmune recurrence in NOD mice by inhibiting the Th1 immune response and inducing the differentiation of Treg cells. - Highlights: • We report a therapeutic potential of DMSO in autoimmune diabetes. • DMSO exhibits an immune modulatory effect. • DMSO treatment increases regulatory T cell differentiation. • The increase in STAT5 signaling pathway explains the effect of DMSO in Tregs.

  12. Dimethyl sulfoxide blocks herpes simplex virus-1 productive infection in vitro acting at different stages with positive cooperativity. Application of micro-array analysis

    Ghazal P


    Full Text Available Abstract Background Dimethyl sulfoxide (DMSO is frequently used at a concentration of up to 95% in the formulation of antiherpetic agents because of its properties as a skin penetration enhancer. Here, we have analyzed the effect of DMSO on several parameters of Herpes Simplex Virus replication. Methods Productive infection levels of HSV-1 were determined by plaque assay or by reporter gene activity, and its DNA replication was estimated by PCR. Transcript levels were evaluated with HSV-specific DNA micro-arrays. Results DMSO blocks productive infection in vitro in different cell types with a 50% inhibitory concentration (IC50 from 0.7 to 2% depending upon the multiplicity of infection. The concentration dependence exhibits a Hill coefficient greater than 1, indicating that DMSO blocks productive infection by acting at multiple different points (mechanisms of action with positive cooperativity. Consistently, we identified at least three distinct temporal target mechanisms for inhibition of virus growth by DMSO. At late stages of infection, DMSO reduces virion infectivity, and markedly inhibits viral DNA replication. A third mode of action was revealed using an oligonucleotide-based DNA microarray system for HSV. These experiments showed that DMSO reduced the transcript levels of many HSV-1 genes; including several genes coding for proteins involved in forming and assembling the virion. Also, DMSO markedly inhibited some but not all early transcripts indicating a previously unknown mode for inhibiting the early phase of HSV transcription-replication cycle. Conclusion These observations suggest that DMSO itself may have a role in the anti-herpetic activity of formulations utilizing it as a dispersant.

  13. Expression of GPI-80, a beta2-integrin-associated glycosylphosphatidylinositol-anchored protein, requires neutrophil differentiation with dimethyl sulfoxide in HL-60 cells.

    Takeda, Yuji; Fu, Junfen; Suzuki, Kichiya; Sendo, Dai; Nitto, Takeaki; Sendo, Fujiro; Araki, Yoshihiko


    GPI-80 is a member of the amidohydrolase family that has been proposed as a potential regulator of beta2-integrin-dependent leukocyte adhesion. GPI-80 is expressed mainly in human neutrophils. Our previous studies suggested that GPI-80 expression might be associated with myeloid differentiation. To verify this, we examined whether GPI-80 is expressed on the human promyelocytic leukemia cell line HL-60 following treatment with differentiation inducers. GPI-80 expression was induced in cells treated with dimethyl sulfoxide (DMSO) to stimulate differentiation down the neutrophil pathway. On the other hand, all-trans-retinoic acid (ATRA), another neutrophil-inducing reagent, induced no clear GPI-80 expression. Potent monocyte-inducing reagents such as 1alpha,25-dihydroxyvitamin D(3) or phorbol 12-myristate 13-acetate also had no significant effect on the protein expression. GPI-80-positive cells were found in the well-differentiated CD11b-positive and transferrin-receptor-negative cell population. Granulocyte colony-stimulating factor, which augments neutrophil differentiation of HL-60 cells, up-regulated GPI-80 expression in the presence of DMSO. Granulocyte/macrophage colony-stimulating factor, which is known to suppress the neutrophil maturation of cells, inhibited expression. Adhesion of DMSO-induced cells was regulated by anti-GPI-80 monoclonal antibody, similar to the regulation observed in neutrophils. These results suggest that use of DMSO to induce neutrophil differentiation provides suitable conditions for GPI-80 expression, and that this culture system may be a helpful model for further study of the regulation of GPI-80 expression during myeloid differentiation.

  14. Synthesis, structure, and reactivity of rhodium and iridium complexes of the chelating bis-sulfoxide tBuSOC2H4SOtBu. Selective O-H activation of 2-hydroxy-isopropyl-pyridine.

    Schaub, Thomas; Diskin-Posner, Yael; Radius, Udo; Milstein, David


    The chloro-bridged rhodium and iridium complexes [M2(BTSE)2Cl2] (M = Rh 1, Ir 2) bearing the chelating bis-sulfoxide tBuSOC2H4SOtBu (BTSE) were prepared by the reaction of [M2(COE)4Cl2] (M = Rh, Ir; COE = cyclooctene) with an excess of a racemic mixture of the ligand. The cationic compounds [M(BTSE)2][PF6] (M = Rh 3, Ir 4), bearing one S- and one O-bonded sulfoxide, were also obtained in good yields. The chloro-bridges in 2 can be cleaved with 2-methyl-6-pyridinemethanol and 2-aminomethyl pyridine, resulting in the iridium(I) complexes [Ir(BTSE)(Py)(Cl)] (Py = 2-methyl-6-pyridinemethanol 5, 2-aminomethyl-pyridine 6). In case of the bulky 2-hydroxy- isopropyl-pyridine, selective OH oxidative addition took place, forming the Ir(III)-hydride [Ir(BTSE)(2-isopropoxy-pyridine)(H)(Cl)] 7, with no competition from the six properly oriented C-H bonds. The cationic rhodium(I) and iridium(I) compounds [M(BTSE)(2-aminomethyl-pyridine)][X] (M = Rh 8, Ir 10), [Rh(BTSE)(2-hydroxy- isopropyl-pyridine)][X] 9(stabilized by intramolecular hydrogen bonding), [Ir(BTSE)(pyridine)2][PF6] 12, [Ir(BTSE)(alpha-picoline)2][PF6] 13, and [Rh(BTSE)(1,10-phenanthroline)][PF6] 14 were prepared either by chloride abstraction from the dimeric precursors or by replacement of the labile oxygen bonded sulfoxide in 3 or 4. Complex 14 exhibits a dimeric structure in the solid state by pi-pi stacking of the phenanthroline ligands.

  15. Formation of three N-acetyl-L-cysteine monoadducts and one diadduct by the reaction of S-(1,2-dichlorovinyl)-L-cysteine sulfoxide with N-acetyl-L-cysteine at physiological conditions: chemical mechanisms and toxicological implications.

    Barshteyn, Nella; Elfarra, Adnan A


    Previously, our laboratory has shown that S-(1,2-dichlorovinyl)-L-cysteine sulfoxide (DCVCS), a Michael acceptor produced by a flavin-containing monooxygenase 3 (FMO3)-mediated oxidation of S-(1,2-dichlorovinyl)-L-cysteine (DCVC), is a more potent nephrotoxicant than DCVC. In the present study, we characterized reactions of DCVCS with nucleophilic amino acids. DCVCS incubations with N-acetyl-L-cysteine (NAC) at pH 7.4 and 37 degrees C for 1 h resulted in the formation of three monoadducts and one diadduct characterized by LC/MS, 1H NMR, and 1H-detected heteronuclear single quantum correlation. The formation of all adducts (with relative ratios of 29, 31, 24, and 12%, respectively) was rapid and time-dependent; the half-lives of the two DCVCS diastereomers in the presence of NAC were 13.8 (diastereomer I) and 9.4 min (diastereomer II). Adducts 1 and 2 were determined to be diastereomers of S-[1-chloro-2-(N-acetyl-L-cystein- S-yl)vinyl]-L-cysteine sulfoxide formed by Michael addition of NAC to the terminal vinylic carbon of DCVCS followed by loss of HCl. Adduct 4 was determined to be S-[2-chloro-2-(N-acetyl-L-cystein- S-yl)vinyl]-L-cysteine sulfoxide formed from the initial Michael addition product followed by a less favorable loss of HCl and/or by a rearrangement of adduct 2 through the formation of a cyclic chloronium ion. The addition of another molecule of NAC to monoadducts 1, 2, or 4 resulted in the formation of the novel diadduct, S-[2,2-( N-acetyl-L-cystein-S-yl)vinyl]-L-cysteine sulfoxide (adduct 3), whose detection in relatively large amount suggests that DCVCS could act as a cross-linking agent. DCVCS was not reactive with N-acetyl-L-lysine or L-valinamide at similar incubation conditions. Collectively, the results suggest selective reactivity of DCVCS toward protein sulfhydryl groups. Furthermore, the cross-linking properties of DCVCS may in part explain its high nephrotoxic potency.

  16. Ammonia-containing dimethyl sulfoxide: an improved solvent for the dissolution of formazan crystals in the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay.

    Wang, Hengwei; Wang, Fengqing; Tao, Xinyi; Cheng, Hairong


    To reduce interference with the dissolution of formazan crystals in the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay, we conducted a systematic investigation to study the effects of various buffers, HCl, NaOH, and ammonia. As a result, we identified an improved solvent, alkaline dimethyl sulfoxide (DMSO) containing 8 to 800 mM ammonia, which could dissolve formazan crystals in approximately 10 min so as to give a stable spectrum by eliminating buffering effects of the residual medium.

  17. Comparison between single and combined post-treatment with S-Methyl-N,N-diethylthiolcarbamate sulfoxide and taurine following transient focal cerebral ischemia in rat brain.

    Gharibani, P; Modi, J; Menzie, J; Alexandrescu, A; Ma, Z; Tao, R; Prentice, H; Wu, J-Y


    We have recently reported on the efficacy of an N-methyl-d-aspartate (NMDA) receptor partial antagonist, S-Methyl-N,N-diethylthiolcarbamate sulfoxide (DETC-MeSO), in improving outcome following stroke, including reduced infarct size and calcium influx, suppressing the endoplasmic reticulum (ER) stress-induced apoptosis as well as improving behavioral outcome. DETC-MeSO was shown to suppress the protein kinase R-like endoplasmic reticulum kinase (PERK) pathway, one of the major ER stress pathways. Several studies including ours have provided evidence that taurine also has neuroprotective effects through reducing apoptosis and inhibiting activating transcription factor 6 (ATF6) and inositol requiring enzyme 1 (IRE-1) pathways. We hypothesized that a combined treatment with DETC-MeSO and taurine would ameliorate ischemia-induced brain injury by inhibiting all three ER stress pathways. Twenty four hours following reperfusion of a 2-h ischemic stroke, rats received either 0.56-mg/kg DETC-MeSO or 40-mg/kg of taurine, either alone or in combination, subcutaneously for 4days. Our study showed that combined DETC-MeSO and taurine, but not DETC-MeSO alone at the dose used, greatly reduced the infarct size, improved performance on the neuro-score test and attenuated proteolysis of αII-spectrin. Meanwhile, the level of the pro-apoptotic protein, Bax, declined and the anti-apoptotic protein, B-cell lymphoma 2 (BCL-2), expression was markedly increased. Combination therapy decreased both caspase-12 and caspase-3 activation by preventing the release of Cytochrome-c from mitochondria, indicating attenuation of apoptosis in ischemic infarct. Glucose-regulated protein (GRP)78 as a marker of the unfolded protein response decreased and levels of the key ER stress protein markers p-PERK-ATF4, p-eIF2α and cleaved-ATF-6 were found to significantly decline. NeuN expression levels indicated that more neurons were protected in the presence of DETC-MeSO and taurine. We also showed that

  18. Probe dependent anomalies in the solvation dynamics of coumarin dyes in dimethyl sulfoxide-glycerol binary solvent: confirming the local environments are different for coumarin dyes.

    Koley, Somnath; Kaur, Harveen; Ghosh, Subhadip


    The solvation dynamics of coumarin dyes in dimethyl sulfoxide (DMSO)-glycerol (GLY) binary mixtures were studied across the GLY concentrations. Three coumarin dyes with widely different hydrophobicities were used for probing the entire polarity regions of this solvent mixture. Multiple anomalous concentration regions with significantly slow solvation times were detected from all three coumarin dyes. However, their precise positions were found to be probe molecule dependent. The solvation dynamics of the moderately hydrophobic dye coumarin 480 (C480) maintain a plateau region with a similar solvation time (∼550 ps) with the increase in GLY concentration until X(GLY) (the mole fraction of glycerol) reaches 0.5. This plateau region is followed by a sudden slowdown (to ∼975 ps) on the addition of more GLY to the DMSO-GLY mixture, and then this slow region persists from X(GLY)∼ 0.55 to 0.65 (peak at 0.6). On further addition of GLY (X(GLY) > 0.7), the solvation dynamics again become slower to ∼828 ps (at X(GLY)∼ 0.8) from ∼612 ps (at X(GLY)∼ 0.7). For very high GLY-content samples (X(GLY) > 0.85), the solvation times remain similar on further changes of the GLY concentrations. In contrast to C480, the most hydrophobic dye coumarin 153 (C153) shows a linear increase of solvation time in the DMSO-GLY mixture, from 102 ps (at X(GLY)∼ 0.1) to 946 ps (at X(GLY)∼ 0.9) with increase in GLY concentration, except for the concentration region, X(GLY)∼ 0.45-0.55 (peak at 0.5), where a substantial slowdown of the solvation time is observed. The highly hydrophilic probe coumarin 343 (C343) demonstrates multiple concentration regions (X(GLY)∼ 0.05-0.10, 0.25-0.35 and 0.55-0.65) where the solvation dynamics are significantly retarded. The presence of probe dependent anomalies in the DMSO-GLY mixture is a clear indication of there being different locations of probe molecules within this solvent mixture. We assume that the slowing-down of the solvation time could

  19. Herbal medicine Yin Zhi Huang induces CYP3A4-mediated sulfoxidation and CYP2C19-dependent hydroxylation of omeprazole

    Lan FAN; Hong-hao ZHOU; Guo WANG; Lian-sheng WANG; Yao CHEN; Wei ZHANG; Yuan-fei HUANG; Rui-xue HUANG; Dong-li HU; Dan WANG


    Aim: To explore the potential interactions between Yin Zhi Huang (YZH) and omeprazole, a substrate of CYP3A4 and CYP2C19. Methods: Eighteen healthy volunteers, including 6 CYP2C19* 1/*1, 6 CYP2C19*1/*2 or *3 and 6 CYP2C19*2/ *2 were enrolled in a 2-phase, randomized, crossover clinical trial. In each phase,the volunteers received either placebo or 10 mL YZH oral liquid, 3 times daily for 14 d. Then all the patients took a 20 mg omeprazole capsule orally. Blood samples were collected up to 12 h after omeprazole administration. Plasma concentrations of omeprazole and its metabolites were quantified by HPLC with UV detection.Results: After 14 d of treatment of YZH, plasma omeprazole significantly decreased and those of omeprazole sulfone and 5-hydroxyomeprazole signifi-cantly increased. The ratios of the area under the plasma concentration-time curves from time 0 to infinity (AUC(0-∞) of omeprazole to 5-hydroxyomprazole and those of omeprazole to omeprazole sulfone decreased by 64.80%±12.51% (P=0.001 ) and 63.31%±18.45 % (P=0.004) in CYP2C 19* 1/* 1,57.98%±14. 80% (P=0.002)and 54.87%±18.42% (P=0.003) in CYP2C19*1/*2 or *3, and 37.74%±16.07% (P=0.004) and 45.16%± 15.54% (P=0.003) in CYP2C19*2/*2, respectively. The decrease of the AUC(0-∞) ratio of omeprazole to 5-hydroxyomprazole in CYP2C19*1/*1 and CYP2C19*1/*2 or *3 was greater than those in CYP2C19*2/*2 (P=0.047 and P=0.009). Conclusion: YZH induces both CYP3A4-catalyzed sulfoxidation and CYP2C19-dependent hydroxylation of omeprazole leading to decreases in plasma omeprazole concentrations.

  20. Comparative studies on exchange reactions of hexafluoroacetylacetonate in bis(hexafluoroacetylacetonato)(dimethyl sulfoxide)dioxouranium(VI) in nonaqueous solvent and supercritical CO(2).

    Kachi, Yoshihiro; Kayaki, Yoshihito; Tsukahara, Takehiko; Ikariya, Takao; Ikeda, Yasuhisa


    Exchange reactions of hexafluoroacetylacetonate (hfacac) in UO2(hfacac)2DMSO (DMSO = dimethyl sulfoxide) in o-C6D4Cl2 and supercritical CO2 (sc-CO2) have been studied using the NMR line-broadening method to compare reactivity in a nonaqueous solvent with that in sc-CO2. It was found that the exchange rates of hfacac in both systems are dependent on the concentration of the enol isomer ([Henol]) of hexafluoroacetylacetone and become slow with an increase in the concentration of free DMSO ([DMSO]). The exchange reaction between free and coordinated DMSO in UO2(hfacac)2DMSO has been also examined in o-C6D4Cl2 and sc-CO2. As a result, the exchange rate of DMSO was found to depend on [DMSO]. From these results, the hfacac exchange reactions in UO2(hfacac)2DMSO in o-C6D4Cl2 and sc-CO2 were proposed to proceed through the mechanism that the ring-opening for one of two coordinated hfacac in UO2(hfacac)2DMSO is the rate-determining step, and the resulting vacant site is coordinated by the incoming Henol, followed by the proton transfer from Henol to hfacac and the ring closure of unidentate hfacac. The rate constants at 60 degrees C and the activation parameters (DeltaH and DeltaS) for the ring-opening path are 35.8 +/- 3.2 s(-1), 57.8 +/- 2.7 kJ.mol(-1), and -42.9 +/- 7.7 J.mol(-1).K(-1) for the o-C6D4Cl2 system, and 518 +/- 50 s(-1), 18.9 +/- 1.8 kJ.mol(-1), and -138 +/- 5 J.mol(-1).K(-1) for the sc-CO2 system, respectively. Differences in kinetic parameters between sc-CO2 and o-C6D4Cl2 systems were proposed to be attributed to the solute-solvent interactions such as Lewis acid-Lewis base interactions and hydrogen bondings between sc-CO2 and beta-diketones.

  1. Crystal structure of poly[tetra-μ2-cyanido-1:2κ8 N:C-bis­(dimethyl sulfoxide-1κO)diargentate(I)iron(II)

    Kucheriv, Olesia I.; Naumova, Dina D.; Tokmenko, Inna I.; Polunin, Ruslan A.; Terebilenko, Kateryna V.


    In the title polymeric complex, [Fe{OS(CH3)2}2{Ag(CN)2}2], the FeII cation is located at an inversion centre and is coordinated by four cyanide (CN−) anions and two dimethyl sulfoxide mol­ecules in a slightly compressed N4O2 octa­hedral geometry, the AgI cation is C-coordinated by two CN− anions in a nearly linear geometry. The CN− anions bridge the FeII and AgI cations to form a two-dimensional polymeric structure extending parallel to (102). In the crystal, the nearest Ag⋯Ag distance between polymeric sheets is 3.8122 (12) Å. The crystal studied was a twin with a contribution of 0.2108 (12) for the minor component.

  2. Asymmetric allylation of α-ketoester-derived N-benzoylhydrazones promoted by chiral sulfoxides/N-oxides Lewis bases: highly enantioselective synthesis of quaternary α-substituted α-allyl-α-amino acids.

    Reyes-Rangel, Gloria; Bandala, Yamir; García-Flores, Fred; Juaristi, Eusebio


    Chiral sulfoxides/N-oxides (R)-1 and (R,R)-2 are effective chiral promoters in the enantioselective allylation of α-keto ester N-benzoylhydrazone derivatives 3a-g to generate the corresponding N-benzoylhydrazine derivatives 4a-g, with enantiomeric excesses as high as 98%. Representative hydrazine derivatives 4a-b were subsequently treated with SmI2, and the resulting amino esters 5a-b with LiOH to obtain quaternary α-substituted α-allyl α-amino acids 6a-b, whose absolute configuration was assigned as (S), with fundament on chemical correlation and electronic circular dichroism (ECD) data. © 2013 Wiley Periodicals, Inc.

  3. Crystal structure of diaquabis(7-diethylamino-3-formyl-2-oxo-2H-chromen-4-olato-κ2O3,O4zinc(II dimethyl sulfoxide disolvate

    Aaron B. Davis


    Full Text Available The structure of the title coordination complex, [Zn(C14H14NO42(H2O2]·2C2H6OS, shows that the ZnII cation adopts an octahedral geometry and lies on an inversion center. Two organic ligands occupy the equatorial positions of the coordination sphere, forming a chelate ring motif via the O atom on the formyl group and another O atom of the carbonyl group (a pseudo-β-diketone motif. Two water molecules occupy the remaining coordination sites of the ZnII cation in the axial positions. The water molecules are each hydrogen bonded to a single dimethyl sulfoxide molecule that has been entrapped in the crystal lattice.

  4. Crystal structure of 6-amino-4-(3-bromo-4-meth-oxy-phen-yl)-3-methyl-2,4-di-hydro-pyrano[2,3-c]pyrazole-5-carbo-nitrile dimethyl sulfoxide monosolvate.

    Yousuf, Sammer; Bano, Huma; Muhammad, Munira Taj; Khan, Khalid Mohammed


    In the pyrazole mol-ecule of the title solvate, C15H13BrN4O2·C2H6OS, the dihedral angle between the benzene ring and the mean plane of the di-hydro-pyrano[2,3-c]pyrazole ring system [r.m.s deviation = 0.031 (2) Å] is 86.71 (14)°. In the crystal, the pyrazole mol-ecules are linked by N-H⋯N hydrogen bonds, forming a layer parallel to (10-1). The pyrazole and dimethyl sulfoxide mol-ecules are connected by an N-H⋯O hydrogen bond.

  5. Calorimetric and computational study of thiacyclohexane 1-oxide and thiacyclohexane 1,1-dioxide (thiane sulfoxide and thiane sulfone). Enthalpies of formation and the energy of the S=O bond.

    Roux, María Victoria; Temprado, Manuel; Jiménez, Pilar; Dávalos, Juan Zenón; Notario, Rafael; Guzmán-Mejía, Ramón; Juaristi, Eusebio


    A rotating-bomb combustion calorimeter specifically designed for the study of sulfur-containing compounds [J. Chem. Thermodyn. 1999, 31, 635] has been used for the determination of the enthalpy of formation of thiane sulfone, 4, Delta(f)H(o) m(g) = -394.8 +/- 1.5 kJ x mol(-1). This value stands in stark contrast with the enthalpy of formation reported for thiane itself, Delta(f)H(o) m(g) = -63.5 +/- 1.0 kJ x mol(-1), and gives evidence of the increased electronegativity of the sulfur atom in the sulfonyl group, which leads to significantly stronger C-SO2 bonds. Given the known enthalpy of formation of atomic oxygen in the gas phase, Delta(f)H(o) m(O,g) = +249.18 kJ x mol(-1), and the reported bond dissociation energy for the S=O bond in alkyl sulfones, BDE(S=O) = +470.0 kJ x mol(-1), it was possible to estimate the enthalpy of formation of thiane sulfoxide, 5, a hygroscopic compound not easy to use in experimental calorimetric measurements, Delta(f)H(o) m(5) = -174.0 kJ x mol(-1). The experimental enthalpy of formation of both 4 and 5 were closely reproduced by theoretical calculations at the G2(MP2)+ level, Delta(f)H(o) m(4) = -395.0 kJ x mol(-1) and Delta(f)H(o) m(5) = -178.0 kJ x mol(-1). Finally, calculated G2(MP2)+ values for the bond dissociation energy of the S=O bond in cyclic sulfoxide 5 and sulfone 4 are +363.7 and +466.2 kJ x mol(-1), respectively.

  6. 二甲基亚砜对猪精液冷冻保存效果研究%Effects of Dimethyl Sulfoxide on Boar Semen Cryopreservation

    马丽; 李青旺; 吴民耀


    This experiment was the study on the effects of dimethyl sulfoxide (DMSO)on boar semen cryo-preservation instead of glycerin.With the control group of 30 mL/L glycerin,by comparing the effects of different groups of DMSO (40,50,60,70,80 mL/L)on boar semen cryopreservation,the DMSO optimum concentration was selected.At the same time,the compatibility of glycerin and DMSO (4∶1,3∶1,3∶2, 1∶1 and 2∶3)were conducted into mixed cryoprotectants with the final concentration of 30 mL/L,respec-tively marked for group A,B ,C,D and E,and then the boar semen cryopreservation were compared and the optimum proportion were selected.The results showed that by adding 60 mL/L DMSO,after being frozen-thawed,the sperm abnormal rates,the plasma membrane integrity and sperm acrosomes integrity were remarkably better than that in the control group and other groups (P 0.05),it had no significant difference.The sperm acro-somes integrity and the plasma membrane integrity were 53% and 52%,which were remarkably higher than groups added with 40,50,70,80 mL/L DMSO and other compatible groups (P 0.05).The sperm viability that was 37% was remarkably lower than that in the control group (P < 0.05),but remarkably higher than that in other DMSO added groups and the compatible groups (P < 0.05).So when adding DMSO sepa-rately,the optimum concentration was 60 mL/L,and the best proportion for the mixed cryoprotectants a-gent,of which the final concentration was 30 mL/L,was 3∶1 (glycerin to DMSO).%用二甲基亚砜(DMSO)替代甘油做猪精液冷冻保护剂并对其效果进行研究。以3%甘油作为对照组,比较不同浓度的 DMSO(40、50、60、70、80 mL/L)对猪精液冷冻保护效果的影响,从而得到 DMSO的最佳添加量。同时,将甘油和 DMSO 配伍(4∶1、3∶1、3∶2、1∶1和2∶3)成最终浓度为3%的混合冷冻保护剂,并分别记作 A、B、C、D 和 E 组,对比其对猪精液冷冻保存的效果,筛选出最佳

  7. An electron spin resonance study for real-time detection of ascorbyl free radicals after addition of dimethyl sulfoxide in murine hippocampus or plasma during kainic acid-induced seizures.

    Matsumoto, Shigekiyo; Shingu, Chihiro; Koga, Hironori; Hagiwara, Satoshi; Iwasaka, Hideo; Noguchi, Takayuki; Yokoi, Isao


    Electron spin resonance (ESR)-silent ascorbate solutions generate a detectable, likely concentration-dependent signal of ascorbyl free radicals (AFR) immediately upon addition of a molar excess of dimethyl sulfoxide (DMSO). We aimed to perform quantitative ESR analysis of AFR in real time after addition of DMSO (AFR/DMSO) to evaluate ascorbate concentrations in fresh hippocampus or plasma following systemic administration of kainate in mice. Use of a special tissue-type quartz cell allowed immediate detection of AFR/DMSO ESR spectra in fresh tissues from mice. AFR/DMSO content was increased significantly in fresh hippocampus or plasma obtained during kainate-induced seizures of mice, reaching maximum levels at 90 min after intraperitoneal administration of 50 mg/kg kainic acid. This suggests that oxidative injury of the hippocampus resulted from the accumulation of large amounts of ascorbic acid in the brain after kainic acid administration. AFR/DMSO content measured on an ESR spectrometer can be used for real-time evaluation of ascorbate content in fresh tissue. Due to the simplicity, good performance, low cost and real-time monitoring of ascorbate, this method may be applied to clinical research and treatment in the future.

  8. A simple assay for the simultaneous determination of human plasma albendazole and albendazole sulfoxide levels by high performance liquid chromatography in tandem mass spectrometry with solid-phase extraction.

    Wojnicz, Aneta; Cabaleiro-Ocampo, Teresa; Román-Martínez, Manuel; Ochoa-Mazarro, Dolores; Abad-Santos, Francisco; Ruiz-Nuño, Ana


    A simple, reproducible and fast (4 min chromatogram) method of liquid chromatography in tandem with mass spectrometry (LC/MS-MS) was developed to determine simultaneously the plasma levels of albendazole (ABZ) and its metabolite albendazole sulfoxide (ABZOX) for pharmacokinetic and clinical analysis. Each plasma sample was extracted by solid phase extraction (SPE) using phenacetin as internal standard (IS). The extracted sample was eluted with a Zorbax XDB-CN column using an isocratic method. The mobile phase consisting of water with 1% acetic acid (40%, A) and MeOH (60%, B), was used at a flow rate of 1 mL/min. ABZ and ABZOX were detected and identified by mass spectrometry with electrospray ionization (ESI) in the positive ion and multiple-reaction monitoring (MRM) mode. The method was linear in the range of 5-1000 ng/mL for ABZ and 10-1500 ng/mL (full validation) or 10-5000 ng/mL (partial validation) for ABZOX, with 5 and 10 ng/mL lower limit of quantification (LLOQ) for ABZ and ABZOX, respectively. The tests of accuracy and precision, matrix effect, extraction recovery and stability of the samples for both ABZ and ABZOX did not deviate more than 20% for the LLOQ and no more than 15% for other quality controls (QCs), according to regulatory agencies.

  9. Kinetics and mechanism for reversible chloride transfer between mercury(II) and square-planar platinum(II) chloro ammine, aqua, and sulfoxide complexes. Stabilities, spectra, and reactivities of transient metal-metal bonded platinum-mercury adducts.

    Gröning, O; Sargeson, A M; Deeth, R J; Elding, L I


    The Hg2+aq- and HgCl+aq-assisted aquations of [PtCl4]2- (1), [PtCl3(H2O)]- (2), cis-[PtCl2(H2O)2] (3), trans-[PtCl2(H2O)2] (4), [PtCl(H2O)3]+ (5), [PtCl3Me2SO]- (6), trans-[PtCl2(H2O)Me2SO] (7), cis-[PtCl(H2O)2Me2SO]+ (8), trans-[PtCl(H2O)2M32SO]+ (9), trans-[PtCl2(NH3)2] (10), and cis-[PtCl2(NH3)2] (11) have been studied at 25.0 degrees C in a 1.00 M HClO4 medium buffered with chloride, using stopped-flow and conventional spectrophotometry. Saturation kinetics and instantaneous, large UV/vis spectral changes on mixing solutions of platinum complex and mercury are ascribed to formation of transient adducts between Hg2+ and several of the platinum complexes. Depending on the limiting rate constants, these adducts are observed for a few milliseconds to a few minutes. Thermodynamic and kinetics data together with the UV/vis spectral changes and DFT calculations indicate that their structures are characterized by axial coordination of Hg to Pt with remarkably short metal-metal bonds. Stability constants for the Hg2+ adducts with complexes 1-6, 10, and 11 are (2.1 +/- 0.4) x 10(4), (8 +/- 1) x 10(2), 94 +/- 6, 13 +/- 2, 5 +/- 2, 60 +/- 6, 387 +/- 2, and 190 +/- 3 M-1, respectively, whereas adduct formation with the sulfoxide complexes 7-9 is too weak to be observed. For analogous platinum(II) complexes, the stabilities of the Pt-Hg adducts increase in the order sulfoxide < aqua < ammine complex, reflecting a sensitivity to the pi-acid strength of the Pt ligands. Rate constants for chloride transfer from HgCl+ and HgCl2 to complexes 1-11 have been determined. Second-order rate constants for activation by Hg2+ are practically the same as those for activation by HgCl+ for each of the platinum complexes studied, yet resolved contributions for Hg2+ and HgCl+ reveal that the latter does not form dinuclear adducts of any significant stability. The overall experimental evidence is consistent with a mechanism in which the accumulated Pt(II)-Hg2+ adducts are not reactive

  10. Crystal structure of catena-poly[[(dimethyl sulfoxide-κO)(pyridine-2,6-di-carboxyl-ato-κ(3) O,N,O')nickel(II)]-μ-pyrazine-κ(2) N:N'].

    Liu, Chen; Thuijs, Annaliese E; Felts, Ashley C; Ballouk, Hamza F; Abboud, Khalil A


    The title coordination polymer, [Ni(C7H3NO4)(C4H4N2)(C2H6OS)] n , consists of [010] chains composed of Ni(II) ions linked by bis-monodentate-bridging pyrazine mol-ecules. Each of the two crystallographically distinct Ni(II) ions is located on a mirror plane and is additionally coordinated by a dimethyl sulfoxide (DMSO) ligand through the oxygen atom and by a tridentate 2,6-pyridine-di-carb-oxy-lic acid dianion through one of each of the carboxyl-ate oxygen atoms and the pyridine nitro-gen atom, leading to a distorted octa-hedral coordination environment. The title structure exhibits an inter-esting complementarity between coordinative bonding and π-π stacking where the Ni-Ni distance of 7.0296 (4) Å across bridging pyrazine ligands allows the pyridine moieties on two adjacent chains to inter-digitate at halfway of the Ni-Ni distance, resulting in π-π stacking between pyridine moieties with a centroid-to-plane distance of 3.5148 (2) Å. The double-chain thus formed also exhibits C-H⋯π inter-actions between pyridine C-H groups on one chain and pyrazine mol-ecules on the other chain. As a result, the inter-ior of the double-chain structure is dominated by π-π stacking and C-H⋯ π inter-actions, while the space between the double-chains is occupied by a C-H⋯O hydrogen-bonding network involving DMSO ligands and carboxyl-ate groups located on the exterior of the double-chains. This separation of dissimilar inter-actions in the inter-ior and exterior of the double-chains further stabilizes the crystal structure.

  11. S-(1,2,2-trichlorovinyl)-L-cysteine sulfoxide, a reactive metabolite of S-(1,2,2-Trichlorovinyl)-L-cysteine formed in rat liver and kidney microsomes, is a potent nephrotoxicant.

    Elfarra, Adnan A; Krause, Renee J


    Previously, we have provided evidence that cytochromes P450 (P450s) and flavin-containing monooxygenases (FMOs) are involved in the oxidation of S-(1,2,2-trichlorovinyl)-L-cysteine (TCVC) in rabbit liver microsomes to yield the reactive metabolite TCVC sulfoxide (TCVCS). Because TCVC is a known nephrotoxic metabolite of tetrachloroethylene, the nephrotoxic potential of TCVCS in rats and TCVCS formation in rat liver and kidney microsomes were investigated. At 5 mM TCVC, rat liver microsomes formed TCVCS at a rate nearly 5 times higher than the rate measured with rat kidney microsomes, whereas at 1 mM TCVC only the liver activity was detectable. TCVCS formation in liver and kidney microsomes was dependent upon the presence of NADPH and was inhibited by the addition of methimazole or 1-benzylimidazole, but not superoxide dismutase, catalase, KCN, or deferoxamine, consistent with the involvement of both FMOs and P450s. Rats given TCVCS at 230 micromol/kg i.p. exhibited acute tubular necrosis at 2 and 24 h after treatment, and they had elevated blood urea nitrogen levels at 24 h, whereas TCVC was a much less potent nephrotoxicant than TCVCS. Furthermore, pretreatment with aminooxyacetic acid enhanced TCVC toxicity. In addition, reduced nonprotein thiol concentrations in the kidney were decreased by nearly 50% 2 h after TCVCS treatment compared with saline-treated rats, whereas the equimolar dose of TCVC had no effect on kidney nonprotein thiol status. No significant lesions or changes in nonprotein thiol status were observed in liver with either TCVC or TCVCS. Collectively, the results suggest that TCVCS may play a role in TCVC-induced nephrotoxicity.

  12. A randomized, open-label, multicenter study of the efficacy and safety of intravesical hyaluronic acid and chondroitin sulfate versus dimethyl sulfoxide in women with bladder pain syndrome/interstitial cystitis.

    Cervigni, Mauro; Sommariva, Monica; Tenaglia, Raffaele; Porru, Daniele; Ostardo, Edoardo; Giammò, Alessandro; Trevisan, Silvia; Frangione, Valeria; Ciani, Oriana; Tarricone, Rosanna; Pappagallo, Giovanni L


    Intravesical instillation of hyaluronic acid (HA) plus chondroitin sulfate (CS) in women with bladder pain syndrome/interstitial cystitis (BPS/IC) has shown promising results. This study compared the efficacy, safety, and costs of intravesical HA/CS (Ialuril(®) , IBSA) to dimethyl sulfoxide (DMSO). Randomized, open-label, multicenter study involving 110 women with BPS/IC. The allocation ratio (HA/CS:DMSO) was 2:1. Thirteen weekly instillations of HA (1.6%)/CS (2.0%) or 50% DMSO were given. Patients were evaluated at 3 (end-of-treatment) and 6 months. Primary endpoint was reduction in pain intensity at 6 months by visual analogue scale (VAS) versus baseline. Secondary efficacy measurements were quality of life and economic analyses. A significant reduction in pain intensity was observed at 6 months in both treatment groups versus baseline (P DMSO for the per-protocol population (mean VAS reduction 44.77 ± 25.07 vs. 28.89 ± 31.14, respectively; P = 0.0186). There were no significant differences between treatment groups in secondary outcomes. At least one adverse event was reported in 14.86% and 30.56% of patients in the HA/CS and DMSO groups, respectively. There were significantly fewer treatment-related adverse events for HA/CS versus DMSO (1.35% vs. 22.22%; P = 0.001). Considering direct healthcare costs, the incremental cost-effectiveness ratio of HA/CS versus DMSO fell between 3735€/quality-adjusted life years (QALY) and 8003€/QALY. Treatment with HA/CS appears to be as effective as DMSO with a potentially more favorable safety profile. Both treatments increased health-related quality of life, while HA/CS showed a more acceptable cost-effectiveness profile. © 2016 Wiley Periodicals, Inc.

  13. The assessment of electrophysiological activity in human-induced pluripotent stem cell-derived cardiomyocytes exposed to dimethyl sulfoxide and ethanol by manual patch clamp and multi-electrode array system.

    Hyun, Soo-Wang; Kim, Bo-Ram; Hyun, Sung-Ae; Seo, Joung-Wook


    Recently, electrophysiological activity has been effectively measured in human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) to predict drug-induced arrhythmia. Dimethyl sulfoxide (DMSO) and ethanol have been used as diluting agents in many experiments. However, the maximum DMSO and ethanol concentrations that can be effectively used in the measurement of electrophysiological parameters in hiPSC-CMs-based patch clamp and multi-electrode array (MEA) have not been fully elucidated. We investigated the effects of varying concentrations of DMSO and ethanol used as diluting agents on several electrophysiological parameters in hiPSC-CMs using patch clamp and MEA. Both DMSO and ethanol at concentrations>1% in external solution resulted in osmolality >400mOsmol/kg, but pH was not affected by either agent. Neither DMSO nor ethanol led to cell death at the concentrations examined. However, resting membrane potential, action potential amplitude, action potential duration at 90% and 40%, and corrected field potential duration were decreased significantly at 1% ethanol concentration. DMSO at 1% also significantly decreased the sodium spike amplitude. In addition, the waveform of action potential and field potential was recorded as irregular at 3% concentrations of both DMSO and ethanol. Concentrations of up to 0.3% of either agent did not affect osmolality, pH, cell death, or electrophysiological parameters in hiPSC-CMs. Our findings suggest that 0.3% is the maximum concentration at which DMSO or ethanol should be used for dilution purposes in hiPSC-CMs-based patch clamp and MEA. Copyright © 2017 Elsevier Inc. All rights reserved.

  14. Bis[N-(2-aminoethylethane-1,2-diamine-κ3N,N′,N′′]copper(II tris[diamminetetrakis(thiocyanato-κNchromate(III] thiocyanate dimethyl sulfoxide tetradecasolvate monohydrate

    Vitalina M. Nikitina


    Full Text Available The ionic title complex, [Cu(C4H13N32]2[Cr(NCS4(NH32]3(NCS·14C2H6OS·H2O, consists of complex [Cu(dien2]2+ cations [dien is N-(2-aminoethylethane-1,2-diamine], complex [Cr(NCS4(NH32]− anions, an NCS− counter-anion and uncoordinated dimethyl sulfoxide (DMSO and water solvent molecules. One of the Cr atoms lies on an inversion center, while the second Cr atom and the Cu atom lie in general positions. The thiocyanate counter-anion and water molecule are disordered over two positions close to an inversion center. There are several types of hydrogen-bond interactions present in the title compound, which connect the complex cations and anions into bulky [Cu2Cr3] polynuclear species. The four NH3 groups of the complex anions and six bridging DMSO O atoms link the three complex anions via hydrogen bonding into the anionic polynuclear species [Cr(NCS4(NH32]3·6DMSO. The last one is connected by four bridging DMSO O atoms with the two complex copper cations through N—H... O hydrogen bonds between the terminal NH3 groups of the anionic polynuclear species and the NH and NH2 groups of the dien ligand. One additional DMSO molecule is connected via hydrogen bonding to one of the terminal NH3 groups of the anionic polynuclear species. Another DMSO molecule is connected via hydrogen bonding to each Cu(dien2]2+ cation.

  15. 二苯并噻吩亚砜的单晶结构及其π-π堆积作用理论研究%Crystal Structure of Dibenzothiophene Sulfoxide and the Theoretical Calculations on Itsπ-πStacking Interaction

    徐志广; 古国榜; 刘海洋


      Crystal structure of dibenzothiophene sulfoxide was obtained by the X-ray diffraction method. It crystallizes in triclinic, space group P-1 with a=0.84712 nm, b=0.94137 nm, c=1.20380 nm,α=97.866 °,β=106.2630 °,γ=96.437 °, V=0.9014 nm3, R1 (all data)= 0.0348 and ωR2(all data) = 0.0814. It exhibits a longer S=O bond length, which meaning a weak S=O bond of dibenzothiophene sulfoxide . With antiparallel-sandwich geometry of III and antiparallel-displaced geometry of IV, the crystals constructed with III and IV alternately following π-π stacking interactions. Theoretical calculations on dibenzothiophene sulfoxide had been carried out by BHandH method at the 6-31+G**level can give reasonable results for III, IV and V structure, furthermore, the Eπ-π, π-π stacking interaction energies, are -36.06, -39.83 and -75.72 kJ/mol respectively. The π-π stacking stability of III and IV may be understood by the matching of atoms’ charge populations of between two II structures.%  采用X射线衍射法测定二苯并噻吩亚砜单晶结构,发现晶体中二苯并噻吩亚砜分子以反平行三明治式的结构III和反平行位移式的结构IV两种堆砌方式交替堆砌形成有序π-π堆积晶体.二苯并噻吩亚砜单晶结构属于三斜型,空间群为P-1,晶体参数为:a=0.84712 nm, b=0.94137 nm, c=1.20380 nm,α=97.866°,β=106.2630°,γ=96.437°, V=0.9014 nm3, R1(全部数据)=0.0348和ωR2(全部数据)=0.0814.利用BHandH/6-31+G**方法计算了二苯并噻吩亚砜分子间的π-π堆积作用,III和IV堆砌模式的π-π堆积效应作用能相当大,其计算值分别为-36.06 kJ/mol和-39.83 kJ/mol,电荷布局表明正负电荷匹配是稳定晶体π-π堆积体系的重要因素.

  16. 乙醇-乙酸乙酯-二甲基亚砜多元系汽液平衡的热力学性质%Thermodynamic Properties for Vapor-Liquid Equilibrium of Ethanol-Ethyl Acetate-Dimethyl Sulfoxide Multicomponent System

    吕长和; 朱德春; 孙虹; 张凌云; 陈红; 施建军; 高大明


    Isobaric vapor-liquid equilibrium (VLE) data of different liquid phase compositions at 101.325 kPa for the ternary system containing ethanol-ethyl acetate-dimethyl sulfoxide and the two constituent binary systems containing ethanol-dimethyl sulfoxide,and ethyl acetate-dimethyl sulfoxide were determined using the novel pumpebullionmeter.The vapor-phase compositions were calculated from Tpx by the indirect method.The experimental Tx data were used to estimate Wilson, NRTL, Margules and van Laar model parameters, and these parameters in turn were used to calculate vapor-phase compositions.The activity coefficients were correlated with the Wilson, nonrandom two-liquid (NRTL) ,Margules and van Lam- models through the least-squares method.The activity coefficients were useful to calculate excess Gibbs function (GE/RT) for the two binary systems.The optimum Wilson model parameters of the ethanol-ethyl acetate binary system were determined by the linear regression based on the two binary systems and the ternary systems.The VLE data of the ternary system were correlated based on Wilson model parameters of these binary systems to build the thermodynamic model and obtained the vapor-phase compositions and the calculated bubble points.The calculated bubble points with the model parameters of activity coefficients were in good agreement with the experimental data.The thermodynamic consistency of the VLE data for the two binary systems were checked by area test method, and the results were satisfactory.%用新型泵式沸点仪测定了101.325 kPa下乙醇-二甲基亚砜、乙酸乙酯-二甲基亚砜2个二元系以及乙醇-乙酸乙酯-二甲基亚砜三元系在不同液相组成时的沸点,并用间接法由Tpx推算了2个二元系的汽相平衡气相组成y.2个二元体系活度系数分别用Wilson、NRTL、Margules和van Laar模型进行关联,用最小二乘法求出了它们的液相活度系数模型参数,所得的液相活度系数来计算2个二元体系的

  17. 未洗脱二甲亚砜冰冻复融血小板的功能及其临床应用研究%Functions and clinical applications of frozen-thawed platelet without dimethyl sulfoxide elution

    郭宗英; 丁国良; 朱琳


    Objective To investigate the functions and feasibility of clinical applications of frozenthawed platelet without dimethyl sulfoxide (DMSO) elution.Methods From January to December 2015,a total of 60 bags (200 mL/bag) of cryopreserved platelets which were prepared and saved by Dongying Central Blood Station of Shangdong Province were included into this study,by simple random sampling method.These 60 bags of cryopreserved platelets were thawed and included in thawed original platelet group (n=60).After mixing 10 mL platelet of thawed original platelet group with 30 mL fresh frozen-thawed plasma according to the volume ratio of 1 ∶ 3,the new gained ones were included into the mixed platelet group (n=60).And a total of fresh platelet which were collected by our blood station in the same period were included into control group (n =60).The quality of above-mentioned frozen-thawed platelets,fresh liquid platelets,and fresh frozen-thawed plasma met the relevant regulations in Quality Requirements for Whole Blood and Blood Components (GB18469-2012).A total of 150 patients who received frozen-thawed platelets without DMSO elution transfusion in the Second People's Hospital of Dongying at the same period were randomly selected as blood transfusions reaction observation objects,by using simple random sampling method.Three groups of platelets were detected with thrombelastogram and coagulation time after recalcification,so as to compare the platelet coagulation function in each group.A retrospective analysis was carried out on the transfusion reactions of 150 patients after transfusion with frozen-thawed platelets without DMSO elution,and the platelet counts in peripheral blood were compared before and 1,24,48 and 72 h after transfusion,so as to analyze the clinical application of frozen-thawed platelets without DMSO elution.The study protocol was approved by the Ethical Review Board of Investigation in Human Being of the Second People' s Hospital of Dongying.Informed consent

  18. Oxidación Selectiva de Sulfuros a Sulfóxidos y Sulfonas utilizando un Nuevo Catalizador con Estructura tipo Keggin (H5PMO11Al0.5V0.5O40 Selective Oxidation of Sulfides to Sulfoxides and Sulfones using a New Catalyst With Keggin type-Structure (H5PMo11Al0.5V0.5O40

    Gustavo Romanelli


    Full Text Available En esta investigación, se ha encontrado un nuevo y selectivo procedimiento de oxidación de sulfuros aromáticos y alifáticos, en sulfóxidos y sulfonas, empleando 35% H2O2 y acetonitrilo como solvente de reacción. Esta oxidación selectiva se realiza en presencia de cantidades catalíticas de un nuevo heteropoliácido, H5PMo11Al0.5V0.5O40, con estructura tipo Keggin. Los rendimientos fueron excelentes y todos los reactivos son baratos y de fácil acceso. La reacción para la preparación de sulfóxidos fue llevada a cabo a temperatura ambiente y a cortos tiempos. La oxidación a sulfotas procede a 40 C dando también excelentes rendimientos.In this research, a new and selective procedure for the oxidation of sulfides, aromatics and aliphatics, to sulfoxides and sulfones, with 35 % aqueous H2O2 and acetonitrile as solvent. Catalytic amount of new Keggin heteropolyacid H5PMo11Al0.5V0.5O40 were used. The yields were excellent and all reagents are cheap and easily available. The reaction for preparation of sulfoxides was carried out at room temperature and short times. The oxidation to sulfones proceeded at 40 C in also excellent yields.

  19. Role of the p70 S6 kinase cascade in neutrophilic differentiation and proliferation of HL-60 cells-a study of transferrin receptor-positive and -negative cells obtained from dimethyl sulfoxide- or retinoic acid-treated HL-60 cells.

    Kanayasu-Toyoda, Toshie; Yamaguchi, Teruhide; Oshizawa, Tadashi; Kogi, Mieko; Uchida, Eriko; Hayakawa, Takao


    Previously, we suggested that p70 S6 kinase (p70 S6K) plays an important role in the regulation of neutrophilic differentiation of HL-60 cells; this conclusion was based on our analysis of transferrin receptor (Trf-R) positive (Trf-R(+)) and negative (Trf-R(-)) cells that appeared after treatment with dimethyl sulfoxide (Me(2)SO). In this study, we analyzed the upstream of p70 S6K in relation to the differentiation and proliferation of both cell types. The granulocyte colony-stimulating factor (G-CSF)-induced enhancement of phosphatidylinositol 3-kinase (PI3K) activity in Trf-R(+) cells was markedly higher than that in Trf-R(-) cells. Wortmannin, a specific inhibitor of PI3K, partially inhibited G-CSF-induced p70 S6K activity and G-CSF-dependent proliferation, whereas rapamycin, an inhibitor of p70 S6K, completely inhibited these activities. The wortmannin-dependent enhancement of neutrophilic differentiation was similar to that induced by rapamycin. From these results, we conclude that the PI3K/p70 S6K cascade may play an important role in negative regulation of neutrophilic differentiation in HL-60 cells. For the G-CSF-dependent proliferation, however, p70 S6K appears to be a highly important pathway through not only a PI3K-dependent but also possibly an independent cascade.


    赵冠宏; 许炽标; 辛文芬


    Aim To study the mechanism of ABZ,ABZSX and ABZSN on Ascaris Suum. Methods The activities of enzyme complexes in mitochondria were detected by spectrophotometer for the study of effects of ABZ, ABZSX and ABZSN on the anaerobic respiratory chain of enzyme complexes in mitochondria of Ascaris Suum muscle and rat liver. Results The activity of succinate CoQ reductase in Ascaris muscle mitochondria was apparently suppressed by ABZ ,ABZSX. Conclusion Preliminary study on the mechanism and toxicity of ABZ through enzyme studies,in order to find a more effective and satisfactory drug with low toxicity for clinical use.%目的初步了解阿苯哒唑(albendazole,ABZ)及其主要代谢物亚砜(albendazole-sulfoxide,ABZSX)和砜(albenda-zole-sulfone,ABZSN)对猪蛔虫的作用机制。方法应用紫外分光光度计扫描系统对猪蛔虫肌肉线粒体中四种酶复合体(com-plex I-NADH细胞色素C脱氢酶complex Ⅱ-琥珀酸CoQ脱氢酶complex Ⅲ-CoQ细胞色素还原酶;complex Ⅳ-细胞色素C氧化酶)活性进行测定,以鼠肝线粒体作对照,再经ABZ及其代谢物ABZSX,ABZSN作用后观察其活性改变。结果 ABZ及其代谢物ABZSX对猪蛔虫肌肉线粒体中琥珀酸脱氢酶(complex Ⅱ)的活性有明显的抑制作用,而对鼠肝线粒体中四种酶复合体均无明显抑制作用。结论 ABZ及其代谢物主要抑制了蛔虫肌肉线粒体中琥珀酸脱氢酶的活性,使其不能完成呼吸链的氧化磷酸化过程,从而达到杀虫效果。

  1. 3种助溶剂对阿苯达唑和阿苯达唑亚砜体外抗包虫活性的影响%Effects of albendazole and albendazole sulfoxide dissolved with different cosolvents on Echinococcus granulosus protoscoleces and vesicles in vitro

    于春洋; 商少华; 张瑞妮; 高惠静; 吕国栋; 赵军; 肖云峰; 吕顺忠; 温浩


    目的 评估二甲基亚砜(DMSO)、吐温80和二者混合溶液等3种助溶剂溶解阿苯达唑(ABZ)和阿苯达唑亚砜(ABZSX)对其体外抗细粒棘球绦虫幼虫作用的影响.方法 采用高效液相色谱法测定吐温80、DMSO及二者混合溶液对阿苯达唑的助溶作用,并比较抗包虫效果.分别将DMSO、吐温80及其混合溶液溶解的ABZ和ABZSX饱和浓度药物溶液加入RPMI 1640培养基中,使DMSO、吐温80及其混合溶液的浓度达到1.0%、0.1%和1.0%+0.1%.用上述含药培养液体外培养细粒棘球蚴原头节和囊泡,并设空白对照组以及适当浓度的助溶剂对照组,隔天观察原头蚴死亡率,周期为10 d;每5d观察囊泡的形态及塌陷率,周期为20 d.结果 各药物作用至第10d和20 d时,联用DMSO及吐温80溶解的ABZ组和ABZSX组原头蚴死亡率及囊泡塌陷率分别为(57.9±6.1)%、(49.32±8.5)%和(58.56±5.34)%、(80.74±1.58)%,均显著高于单用助溶剂组(P<0.01);空白对照组和助溶剂组原头蚴死亡率及囊泡塌陷率均低于9%.结论 当药物相同时,DMSO和吐温80混合助溶剂组的抗原头蚴及囊泡作用优于DMSO助溶剂组,DMSO助溶剂组优于吐温80助溶剂组;助溶剂一致时,抗原头蚴效果ABZ组优于ABZSX组,抗囊泡效果ABZSX组优于ABZ组.%Objective Albendazole (ABZ) and albendazole sulfoxide (ABZSX) were dissolved with 1% dimethyl sulfoxide (DMSO),0.1 % Tween80,or a mixture of DMSO and Tween80 to investigate their anti-hydatid action on Echinococcus granulosus protoscoleces and E.granulosus vesicles.Methods High-performance liquid chromatography (HPLC)was used to examine dissolution of ABZ by Tween 80,DMSO,and a mixture of DMSO and Tween80.RPMI1640 culture medium with saturated concentrations of ABZ and ABZSX was used to culture E.granulosus protoscoleces and vesicles.ABZ and ABZSX were dissolved with DMSO,Tween80,or a mixture of DMSO and Tween80.The concentrations of DMSO,Tween80,and the

  2. (Benzyl phenyl sulfoxide-κO)dichloridodiphenyl­tin(IV)

    Guo-Xia Tan; Chang-Fa Zhang; Xi-Cheng Liu


    The SnIV atom in the title compound, [Sn(C6H5)2Cl2(C13H12OS)], displays a distorted C2Cl2O trigonal–bipyramidal coordination environment, with a mean Sn—C distance of 2.121 (9) Å and with Sn—O = 2.331 (2) Å. The SnIV atom is displaced by 0.169 (2) Å from the equatorial C2Cl plane towards the direction of the second axially bonded Cl atom.

  3. Should the standard dimethyl sulfoxide concentration be reduced?

    Morris, Curly; de Wreede, Liesbeth; Scholten, Marijke


    and Marrow Transplant Group centers undertaking autologous transplantation on patients with myeloma and lymphoma and analyze side effects after return of DMSO-preserved stem cells. RESULTS: While the majority of centers continue to use 10% DMSO, a significant proportion either use lower concentrations...... were able to confirm this result in all but young myeloma patients in whom an inversion of the odds ratio was seen, possibly related to the higher dose of melphalan received by young myeloma patients. CONCLUSION: We suggest better standardization of preservation method with reduced DMSO concentration...

  4. Phototriggered sulfoxide isomerization in [Ru(pic)2(dmso)2].

    Rachford, Aaron A; Petersen, Jeffrey L; Rack, Jeffrey J


    We report the characterization and photochemistry of a simple ruthenium coordination complex containing only picolinate (pic) and dmso, which exhibits a large isomerization quantum yield (Phi(SS-->OO) = 0.50) in various solvents. The picolinate ligands of [Ru(pic)(2)(dmso)(2)] are in a cis arrangement so that the carboxylate oxygen of one pic ligand (O1) is trans to the pyridine of the second picolinate (N2). One dmso ligand (S1) is trans to a pyridine nitrogen (N1), while the second dmso (S2) is trans to a carboxylate oxygen (O3). The cyclic voltammetry, (1)H NMR, IR, and UV-vis spectroscopy data suggest that while both dmso ligands isomerize photochemically, only one dmso ligand isomerizes electrochemically. Isomerization quantum yields for each dmso ligand differ by an order of magnitude (Phi(SS-->SO) = 0.46 and Phi(SO-->OO) = 0.036). In agreement with previous results, the isomerization quantum yield for each dmso is dependent on the ligand that is trans to the dmso.

  5. Study of Antibacterial Effect of Oleanolic Acid Combinating with Dimethyl Sulfoxide Against Enterococcus Faecalis in Biofilm%齐墩果酸联合二甲亚砜对生物膜中粪肠球菌抑菌作用研究

    吴悠; 胡焱; 王瑶


    目的:研究齐墩果酸联合二甲亚砜对单一生物膜中粪肠球菌的抑菌效果。方法:(1)采用微量棋盘液体稀释法测定齐墩果酸与二甲亚砜联合抑菌浓度分数指数(FICI)。(2)建立24 h粪肠球菌生物膜模型,随机分为三组:1 mg/mL齐墩果酸+50%二甲亚砜(A组)、2%氯己定(B组)、去离子水(C组)。各组药物分别作用30 min后荧光染色,激光共聚焦显微镜(CLSM)观察染色情况及死、活菌数量变化。结果:(1)二甲亚砜和齐墩果酸对粪肠球菌的MIC分别20%和100μg/mL。联合时FICI=0.5125。(2)A组、B组生物膜中以死菌为主,仅见散在零星分布活菌,C组生物膜中以活菌为主,仅存在极少量死菌。结论:齐墩果酸与二甲亚砜联合,对体外粪肠球菌的抗菌作用表现为相加作用,1 mg/mL齐墩果酸联合50%二甲亚砜可有效抑制生物膜中粪肠球菌生长。%Objective:To evaluate the antibacterial effect of oleanolic acid(OA) and dimethyl sulfoxide (DMSO) against enterococcus faecalis (E.faecalis) in biofilm in vitro.Method:(1)The microscale checkerboard technique was applied to calculate the FICI value of OA combinating with DMSO.(2)E.faecalis biofilm models were formed after 24h. Samples were randomly divided into three groups:1 mg/mL OA+50% DMSO(group A), 2% chlorhexidine(group B), deionized water(group C).Medicating in each groups for 30 min respectively. After fluorescent staining, samples were observed by CLSM.Result:(1)The MICs of DMSO and OA against E.faecalis were 20% and 100 μg/mL.FICI=0.5125 when they were combined.(2)The biofilms of group A and B were mainly composed of dead bacteria, only scattered living bacteria could be found.The biofilm of group C was mainly composed of living bacteria,only tiny dead bacteria could be detected.Conclusion:Additive joint action was existed between OA and DMSO against E.faecalis.1 mg/mL OA combinating with 50% DMSO can

  6. 蛋氨酸亚砜还原酶B1在糖尿病小鼠肾脏中的表达变化及其与氧化应激的关系%Expression changes of methionine sulfoxide reductase B 1 in the kidneys of instreptozocin-induced diabetic mice and its relationship with oxidative stress

    杨志英; 刘向春; 关广聚


    Objective To determine the expression changes of methionine sulfoxide reductase B1 (MsrB1)in the kid-neys of streptozotocin (STZ)-induced diabetic mice and to investigate its relationship with oxidative stress.Methods Ten-week-old male C57BL/6 mice were randomly divided into four groups:normal control mice group (NC group), unilaterally nephrectomized mice group (UX group),STZ-induced diabetic mice group (STZ group)and STZ mice with unilateral renal ablation group (STZ-UX group).At the end of the 8 th week after the construction of the model, immunohistochemistry detected MsrB 1 expression and distribution in the kidney tissues.The mRNA and protein levels of MsrB1 were determined by real-time PCR and Western blotting.The levels of oxidative stress in the kidneys of four groups were measured by the kits of malondialdehyde (M DA),protein carbonyl (PC)and total sulfhydryl groups (TS H).Results MsrB 1 was located in the nucleus and cytoplasm of the renal tubular epithelial cells in mice.Com-pare with NC group,the mRNA and protein levels of MsrB 1 and the content of TS Hin the kidneys of STZ group and STZ-UX group were lower,the contents of M DA and PC were higher (P0.05).Correlation analysis showed that in the STZ group and STZ-UX group,MsrB1 protein expressions were negatively correlated with M DA and PC (P<0.05),and positively correlated with TS Hlevels (P<0.05).Conclusion The expression of MsrB1 decreases significantly in the kidneys of STZ-induced diabetic mice,which may play an important role in the oxidative stress of diabetic nephropathy.%目的:探讨链脲佐菌素(STZ)诱导的糖尿病小鼠肾组织中蛋氨酸亚砜还原酶B 1(MsrB 1)的表达变化及其与氧化应激的关系。方法将10周龄雄性C57BL/6小鼠随机分为4组:正常对照组(NC 组)、单侧肾切除组(UX组)、STZ组和单侧肾切除加STZ组(STZ-UX组)。模型制备后第8周末,免疫组化法检测MsrB 1在肾组织中的表达

  7. Investigating the Mechanisms of Action and the Identification of Breast Carcinogens by Computational Analysis of Female Rodent Carcinogena


    altered sexual differentiation [7,8], immune disturbances [9] as well as no observable adverse effects or even beneficial responses [1]. It has also been...Dacthal Diamyl phthalate - - - Diazinon Dibutyl phthalate - - - Dimethyl isophthalate - - - Dimethyl terephthalate - - - Dinonyl phthalate - - - Dinoseb

  8. Octakis(dimethyl sulfoxide-κOcerium(III μ6-oxido-dodeca-μ2-oxido-hexaoxidohexamolybdate(VI dimethyl sulfoxide tetrasolvate

    Arbia Ben Khélifa


    Full Text Available The title complex, [Ce(C2H6OS8]2[Mo6O19]3·4C2H6OS, was obtained as a byproduct of the reaction of [(C4H94N]2[Mo6O19] with Ce(NO33·6H2O and phthalic acid in dimethylsulfoxide solution. The asymmetric unit consists of a complex [Ce(C2H6OS8]3+ cation, one and a half of the Lindqvist-type [Mo6O19]2− polyanions and two dimethylsulfoxide solvent molecules; the half polyanion lies on an inversion center. The Ce3+ ion is coordinated by eight dimethylsulfoxide ligands through the O atoms in the form of a distorted square antiprism. The Ce—O bond lengths range from 2.429 (6 to 2.550 (5 Å. The cohesion of the structure is ensured by S...O [3.115 (6, 3.242 (10 and 3.12 (3 Å], O...O [3.037 (10 Å] and C—H...O interactions between cations and anions. The S and C atoms of a dmso ligand are disordered over three sites in a 0.45:0.30:0.25 ratio. The dimethylsulfoxide solvent molecules are highly disordered and could not be modelled successfully; their contribution was therefore removed from the refinement using the SQUEEZE routine in PLATON [Spek (2009. Acta Cryst. D65, 148–155]. Potential solvent-accessible voids of 500.0 Å3 occur in the crystal structure.

  9. Conference on Biological Actions and Medical Applications of Dimethyl Sulfoxide (DMSO), 15-17 September 1982.


    10O ml). Of the 18 control rats that survived the procedure none lived longer than five days. Death was attributed to a typical uremic syndrome. At 24...STEROSKI, 1. Mossy, G. R. RAO & J MICKELL. 1977. Thiopental amelioration of post-ischemic encephalopathy in moon- keys. Adta Neurol. Scand. Suppl

  10. Acute Oral Toxicity of DMSO (Dimethyl Sulfoxide) Process Stream Samples in Male and Female Rats.


    Cyclotrimethylenetrinitramine, Cyclonite Hexogen, RDX Chemical Abstract Service Registry Number: 121-82-4 Structural formula: 02N\\ IN02 N N NO2 Empirical...Ammunition Plant Kingsport, TN 2. Chemical name: Octahydro-1,3,5,7-Tetranitro-1,3,5,1-Tetrazine HMX, Cyclotetramethylenetrinitramine Chemical Abstract Service...TN 3. Chemical name: Hexahydro-1-(NI)-Acetyl-3,5-Dinitro-1,3,5-Triazine, TAX Chemical Abstract Service Registry Number: 14168-42-4 Structural formula

  11. Diaquabis(dimethyl sulfoxide-κObis(saccharinato-κNcobalt(II

    Fezile S. W. Potwana


    Full Text Available The title complex, [Co(C7H4NO3S2(C2H6OS2(H2O2], contains a Co2+ cation in an octahedral coordination environment. The metal atom is surrounded by two different neutral ligands, namely dimethylsulfoxide (DMSO and water, each coordinating through the O atom. The anionic saccharinate (sac; 1,1,3-trioxo-2,3-dihydro-1λ6,2-benzothiazol-2-ide ligand coordinates through the N atom. Each of the three similar ligand pairs is in a trans configuration with respect to each other. The Co atom lies on a crystallographic center of symmetry and the octahedral geometry is not significantly distorted. A short O—H...O hydrogen bond is present between a water H atom and the ketone O atom; two longer hydrogen bonds (intra- and intermolecular are also present between a water H and a sulfonic O atom, forming a supramolecular assembly through head-to-tail aggregation between adjacent complexes.

  12. (Benzyl phenyl sulfoxide-κO)­chlorido­triphenyl­tin(IV)

    Guo-Xia Tan; Chang-Fa Zhang


    The SnIV atom in the title compound, [Sn(C6H5)3Cl(C13H12OS)], is situated within a distorted C3ClO trigonal–bipyramidal coordination geometry with a mean Sn—C distance of 2.136 (6) Å and with an Sn—O distance of 2.393 (4) Å. The SnIV atom lies 0.171 (3) Å out of the equatorial C3 plane in the direction of the axially bound Cl atom.

  13. CCDC 1515632: Experimental Crystal Structure Determination : hexakis(dimethyl sulfoxide)-manganese(ii) tetraiodide

    Haque, M.A.


    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  14. A study on tailor made ruthenium sulfoxide complexes: Synthesis, characterization and application

    Mehrotra Ripul


    Full Text Available In this study, a dinucleating spacer incorporating two 2-aminopyridine units has been used to prepare seven novel dinuclear compounds. These molecules were characterized by elemental analyses, conductivity measurements, magnetic susceptibility, FT-IR, FAB-Mass, electronic, 1H and 13C{1H}NMR spectral studies. The complex [{trans,mer-RuCl2(DMSO3}2(μ-5,5'-methylenebis(2-aminopyridine].2DMSO, 2 was also characterized through 1H-1H COSY NMR. There are mainly three different formulations; [{cis,fac-RuCl2(SO3}2(μ-MBAP].2SO; [{trans,mer-RuCl2(SO3}2(μ-MBAP].2SO and [{trans-RuCl4(SO}2(μ-MBAP]2- [X]2+; where SO = DMSO / TMSO; MBAP = 5,5'-methylenebis(2-aminopyridine and [X]+ = [(DMSO2H]+, Na+ or [(TMSOH]+. The coordination was found through cyclic nitrogen of pyridine ring in octahedral environment for both metal centers. The chemical behivour of [{cis,fac-RuCl2(DMSO3}2(μ-5,5'-methylenebis(2-aminopyridine].2DMSO, 1 and 2 in aqueous solution with respect to time was observed by conductivity measurements and UV-vis spectrophotometer. All complexes were found to possess prominent antibacterial activity against Escherichia coli in comparison to Chloramphenicol and Gatifloxacin.

  15. An Essential Protein Repair Enzyme: Investigation of the Molecular Recognition Mechanism of Methionine Sulfoxide Reductase A


    KKMVENAKK) derived from staphylococcal nuclease, and the non-steroidal anti-inflammatory drug sulindac . Using the hydrophobic marker 8-anilino- 1-naphthalene...a 9-amino acid peptide (KKMVENAKK) derived from staphylococcal nuclease, and the non-steroidal anti-inflammatory drug sulindac . Using the...acid (ANS)……………………………………16 9-amino Acid Peptide (KKMVENAKK).................................................................16 Sulindac

  16. trans-Bis(dimethyl sulfoxide-κObis(thiosemicarbazide-κ2N1,Scadmium dipicrate dihydrate

    Helen Stoeckli-Evans


    Full Text Available In the cation of the title compound, [Cd(CH5N3S2(C2H6OS2](C6H2N3O72·2H2O, the CdII atom is located on an inversion center. It is hexacoordinated in an octahedral fashion by two thiosemicarbazide molecules, which coordinate in a bidentate manner via the S and N atoms, and to the O atom of two dimethyl sufoxide (DMSO molecules. The charges are equilibrated by two picrate anions and the complex crystallizes as a dihydrate. In the crystal, these units are linked by a number of O—H...O and N—H...S hydrogen bonds and weak C—H...O interactions, forming a three-dimensional network.

  17. Ion transport through dimethyl sulfoxide (DMSO) induced transient water pores in cell membranes.

    He, Fei; Liu, Weirong; Zheng, Shengchao; Zhou, Li; Ye, Benlan; Qi, Zhi


    It is well known that dimethyl sulphoxide (DMSO) increases membrane permeability, which makes it widely used as a vehicle to facilitate drug delivery across biological membranes. However, the mechanism of how DMSO increases membrane permeability has not been well understood. Recently, molecular dynamics simulations have demonstrated that DMSO can induce water pores in biological membranes, but no direct experimental evidence is so far available to prove the simulation result. Using FluxOR Tl⁺ influx assay and intracellular Ca²⁺ imaging technique, we studied the effect of DMSO on Tl⁺ and Ca²⁺ permeation across cell membranes. Upon application of DMSO on CHO-K1 cell line, Tl⁺ influx was transiently increased in a dose-dependent manner. The increase in Tl⁺ permeability induced by DMSO was not changed in the presence of blockers for K⁺ channel and Na⁺-K⁺ ATPase, suggesting that Tl⁺ permeates through transient water pores induced by DMSO to enter into the cell. In addition, Ca²⁺ permeability was significantly increased upon application of DMSO, indicating that the transient water pores induced by DMSO were non-selective pores. Furthermore, similar results could be obtained from RAW264.7 macrophage cell line. Therefore, this study provided experimental evidence to support the prediction that DMSO can induce transient water pores in cell membranes, which in turn facilitates the transport of active substances across membranes.

  18. Low concentrations of ethanol but not of dimethyl sulfoxide (DMSO) impair reciprocal retinal signal transduction.

    Siapich, Siarhei A; Akhtar, Isha; Hescheler, Jürgen; Schneider, Toni; Lüke, Matthias


    The model of the isolated and superfused retina provides the opportunity to test drugs and toxins. Some chemicals have to be applied using low concentrations of organic solvents as carriers. Recently, E-/R-type (Cav2.3) and T-type (Cav3.2) voltage-gated Ca(2+) channels were identified as participating in reciprocal inhibitory retinal signaling. Their participation is apparent, when low concentrations of NiCl2 (15 μM) are applied during superfusion leading to an increase of the ERG b-wave amplitude, which is explained by a reduction of amacrine GABA-release onto bipolar neurons. During these investigations, differences were observed for the solvent carrier used. Recording of the transretinal receptor potentials from the isolated bovine retina. The pretreatment of bovine retina with 0.01 % (v/v) dimethylsulfoxide did not impair the NiCl2-mediated increase of the b-wave amplitude, which was 1.31-fold ± 0.03 of initial value (n = 4). However, pretreatment of the retina with the same concentration of ethanol impaired reciprocal signaling (0.96-fold ± 0.05, n = 4). Further, the implicit time of the b-wave was increased, suggesting that ethanol itself but not DMSO may antagonize GABA-receptors. Ethanol itself but not DMSO may block GABA receptors and cause an amplitude increase by itself, so that reciprocal signaling is impaired.

  19. The effect of Dimethyl Sulfoxide on hepatogenic differentiation of Mesenchymal Stem Cells

    Effat Alizadeh


    The results demonstrate that DMSO speeds up hepatic differentiation of AT-MSCs characterized by rapid changes in morphology, higher expression of hepatic marker gene (AFP in both mRNA and protein level (P

  20. Radioprotective effects of dimethyl sulfoxide in the artificial skin reconstructed with cultured human cells

    Ryu, Young Ha; Choi, Karp Shik [College of Dentistry, Kyungpook National University, Daegu (Korea, Republic of); Song, In Hwan [Department of Anatomy, College of Medicine, Yeungnam University, Daegu (Korea, Republic of)


    To evaluate cultured human artificial skin as an experimental model for studying radiation effects in vitro. The skin was constructed by culturing keratinocytes over collagen lattice which made by culturing fibroblasts. Two groups were irradiated to gamma rays at single dose of 25 Gy with or without 3.5% of DMSO. Ultrastructures were investigated by electron microscopy after irradiation. The number of epidermal layers and expression of cytokeratin (CK) 14 and 10 were also seem by light microscopy. At 2 days after irradiation in experimental group without DMSO, necrotic cells were rarely found in the spinosal layer and undercornified cells were visible in the horney layer. Similar findings were also found in experimental group with DMSO but in mild form. The number of epidermal layers in experimental group without DMSO were significantly fewer than other group. CK 14 expressed in all the layer excluding horney layer but CK 10 expressed over 3-4 basal layers. Such patterns of CK expression were similar to all groups. It is suggested that structures of the keratinocytes and epidermal formation could be disturbed by irradiation in artificial skin and that DMSO can protect these damages. Therefore this work could be used as an organotypic experimental model in vitro using human cells for studying radiation effect in skin. Furthermore structural findings provided in this study could be used as useful basic data in further study using this model.

  1. Chronic intracerebroventricular administration of dimethyl sulfoxide attenuates streptozotocin-iduced memory loss in rats

    Esmaeil Akbari


    Conclusion: Taken together, the results suggest that DMSO may be appropriate as adjuvant therapies for the prevention of memory impairment in the experimental models of AD. Therefore, use of DMSO as a solvent in AD animal studies should be considered having beneficial effects on cognitive function.

  2. Health Effects Research on Munition Contaminated Dimethyl Sulfoxide Recrystallization Process Solvent. Phase I Studies.


    significant toxic side effects, it may soon be licensed by the U.S. Food and Drug Administration for use in the treatment of scleroderma and muscle...Large Caliber Weapon Systems Laboratory, US Army Armament Research and Development Center, Dover, NJ, for participating in the technical coordination...Army Armament Research and Development Center (ARDC) Large Caliber Weapons Systems Laboratory (LCWSL), is currently conducting a process develop

  3. Association in ethylammonium nitrate-dimethyl sulfoxide mixtures: First structural and dynamical evidences

    Russina, Olga; Macchiagodena, Marina; Kirchner, Barbara; Mariani, Alessandro; Aoun, Bachir; Russina, Margarita; Caminiti, Ruggero; Triolo, Alessandro


    Here we report the first structural and dynamic investigation on ethylammonium nitrate, a representative protic Ionic liquid, and dimethylsulfoxide. By using joined x/ray and neutron diffraction, we exploit the EPSR approach to extract structural information at atomistic level. EAN/DMSO turns out to be homogeneous at microscopic scales and indications for the existence of a structural leit motiv with stoichiometric composition 2DMSO:1EAN are found. Dielectric spectroscopy is used to access the relaxation map of the DMSO:EAN = 60:40 mixture. No crystallisation is detected and three relaxation processes could be characterised. Overall this study provides new indications of strict analogies between water and ethylammonium nitrate. (c) 2014 Elsevier B.V. All rights reserved.

  4. Acute Oral Toxicity of DMSO (Dimethyl Sulfoxide) Process Stream Samples in Male and Female Mice.


    AInjection Volume: 10 microliters 10. Column: LiChrosorb- RP18 , 1/4" x 12" ss eDX Detector: UV. 215-290 nm in s Io 10 nm increments TAX Solvent System: 80...water SEX 20% methanol Flow Rate: 2.5 ml/min Injection Volume: 10 microliters 11. Column: LiChrosorb- RP18 1/4" x 12" ss No component Detector: UV at

  5. Theoretical study on the acidities of chiral phosphoric acids in dimethyl sulfoxide: hints for organocatalysis.

    Yang, Chen; Xue, Xiao-Song; Jin, Jia-Lu; Li, Xin; Cheng, Jin-Pei


    The pKa values of 41 chiral phosphoric acid-family catalysts in DMSO were predicted using the SMD/M06-2x/6-311++G(2df,2p)//B3LYP/6-31+G(d) method for the first time. The study showed that the calculated pKa's range from -4.23 to 6.16 for absolute pKa values and from -4.21 to 6.38 for relative pKa values. Excellent agreement between the calculated and experimental pKa's was achieved for the few available cases (to a precision of around 0.4 pKa unit), indicating that this strategy may be suitable for calculating highly accurate pKa's. A good linear correlation between the pKa's for 3 and 3' disubstituted phenyl BINOL phosphoric acids and the Hammett constants was obtained. The relationship between the acidities of phosphoric acid catalysts and their reaction activity and selectivity was also discussed. Knowledge of the pKa values of phosphoric acids should be of great value for the understanding of chiral Brønsted acid-catalyzed reactions and may aid in future catalyst design.

  6. Effects of dimethyl sulfoxide on asymmetric division and cytokinesis in mouse oocytes

    Shen Xinghui; Zhou Dongjie; Gu Yanli; Zhang Na; Li Tong; Wu Xi; Lei Lei


    Objective: To observe the effect of DMSO on mouse oocyte meiotic maturation. Results: In DMSO-treated oocytes, we observed abnormal MII oocytes that contained large polar bodies, including 2-cell-like MII oocytes, during in vitro maturation. Oocyte polarization did not occur, due to the absence of actin cap forma-tion and spindle migration. These features are among the primary causes of abnormal symmetric division;however, analysis of the mRNA expression levels of genes related to asymmetric division revealed no significant difference in the expression of these factors between the 3% DMSO-treated group and the control group. After each "blasto-mere" of the 2-cell-like MII stage oocytes was injected by one sperm head respectively, the oocytes still possessed the ability to extrude the second polar body from each "blastomere" and to begin cleavage. However, MII oocytes with large polar bodies developed to the blastocyst stage after intracytoplasmic sperm injection ( ICSI ) . Further-more, other permeable cryoprotectants, such as ethylene glycol and glycerol, also caused asymmetric division fail-ure. Conclusions:Permeable cryoprotectants, such as DMSO, ethylene glycol, and glycerol, affect asymmetric di-vision. DMSO disrupts cytokinesis completion by inhibiting cortical reorganization and polarization. Oocytes that undergo symmetric division maintain the ability to begin cleavage after ICSI.

  7. Effects of intratesticular administration of zinc gluconate and dimethyl sulfoxide on clinical, endocrinological, and reproductive parameters in dogs.

    Vannucchi, C I; Angrimani, D S R; Eyherabide, A R; Mazzei, C P; Lucio, C F; Maiorka, P C; Silva, L C G; Nichi, M


    Nonsurgical sterilization methods are considered alternative tools for the worldwide challenge represented by canine overpopulation control. Intratesticular injection of zinc gluconate associated with DMSO arises as an option because of the effortless diffusion throughout the testicular parenchyma. This study aimed to verify the effectiveness of a double testicular injection of zinc gluconate associated with DMSO as a chemical contraceptive for male dogs. The study was conducted with 22 dogs treated with two intratesticular injections of the chemical solution (treated group; n = 15) or 0.9% NaCl solution (control group; n = 7) on a monthly interval. All animals were submitted to clinical examination, breeding soundness evaluation including morphologic and sonographic examination of the testes, assessment of libido, volume of the sperm-rich fraction, sperm motility, total sperm count, plasma membrane integrity, sperm morphologic abnormalities, and the total number of morphologically normal and motile sperm in the ejaculate. Blood samples were collected for serum testosterone analysis, and testicular tissue was morphologically and histologically evaluated. No clinical alterations and signs of pain or local sensitivity along the experimental period were noticed. However, the injection of zinc gluconate and DMSO significantly reduced libido and testosterone concentrations (even beyond the reference range for intact male dogs). Impairment of sperm quality-related variables was observed 15 days after the first intratesticular administration of zinc gluconate and DMSO (i.e., decrease in sperm count and sperm motility and an increase in major sperm defects and by this a decrease in the total number of morphologically normal and motile sperm). Testicular ultrasonographic analysis revealed reduction of testicular volume and changes of testicular echotexture in treated animals, compatible with tissue degeneration, fibrosis, and calcification of testicular parenchyma on histologic examination. In conclusion, intratesticular administration of zinc gluconate associated with DMSO reduces reproductive potential which may lead to subfertility or infertility in dogs.

  8. Dermal Sensitization Potential of the Holston Compounds: Virgin DMSO (Dimethyl Sulfoxide), DMSO Recycle Solvent, and DMSO Evaporator Sludge.


    name: Hexahydro-l, {,,-Trinitro-1,3,5-Triazine, Cyclotrimethyleetririitranine, Cyclonite Hexogen, RDX Chemical Abstract Service Registry Number: 121-8 2...HMX, Cyclotetramethylenetrinitramine Chemical Abstract Service Registry Number: 2691-411-0 Structural formula: NO2 02 N-N N-NO2 LNI2 NO2 APPENDIX A...Ammunition Plant Kingsport, TN 3. Chemical name: Hexahydro-l-(’)-Acetyl-3,5-Dinitro-1,3,5-Triazine, TAX Chemical Abstract Service Registry Number

  9. Electrochemical and Spectroscopic Behaviors of 1-(o-, m-, p- Cl, or Br) Substituted Phenyl-3, 5-diphenylformazans in Dimethyl Sulfoxide.

    Tezcan, Habibe; Ekmekci, Güler


    1-(o-, m-, p-Cl, -Br) substituted phenyl-3, 5-diphenylformazans were synthesized. Their structures were elucidated and spectral behaviours were investigated by elemental analysis, FT-IR, UV-vis spectral data. The electrochemical properties such as number of electrons transferred (n), diffusion coefficient (D) and heterogeneous rate constant (ks) were determined and possible mechanisms were proposed using platinum and ultramicro platinum electrodes, cyclic voltammetry, linear sweep voltammetry and chronoamperometry. The oxidations were carried out at different electrochemical steps that were dependent upon the structure of formazans. The relation between their absorption properties with electrochemical properties was investigated. A suitable correlation was obtained between the absorption λmax with electrochemical properties, and between the oxidation peak potentials Eox1 with ks values of formazans.

  10. Meta-Analysis of the Related Nutritional Supplements Dimethyl Sulfoxide and Methylsulfonylmethane in the Treatment of Osteoarthritis of the Knee

    Sarah Brien


    Full Text Available Dimethyl sulphoxide and methylsulfonylmethane are two related nutritional supplements used for symptomatic relief of osteoarthritis (OA. We conducted a meta-analysis to evaluate their efficacy in reducing pain associated with OA. Randomized or quasi-randomized controlled trials (RCTs, identified by systematic electronic searches, citation tracking and searches of clinical trial registries, assessing these supplements in osteoarthritis of any joint were considered for inclusion. Meta-analysis, based on difference in mean pain related outcomes between treatment and comparator groups, was carried out based on a random effect model. Seven potential trials were identified of which three RCTs, two DMSO and one MSM (total N=326 patients were eligible for inclusion. All three trials were considered high methodological quality. A significant degree of heterogeneity (χ2=6.28, P=.043 was revealed. Two studies demonstrated statistically significant (but not clinically relevant reduction in pain compared with controls; with one showing no group difference. The meta-analysis confirmed a non significant reduction of pain on visual analogue scale of 6.34 mm (SE = 3.49, 95% CI, −0.49, 13.17. The overall effect size of 1.82 was neither statistically nor clinically significant. Current evidence suggests DMSO and MSM are not clinically effective in the reduction of pain in the treatment of OA. No definitive conclusions can currently be drawn from the data due to the mixed findings and the use of inadequate dosing periods.

  11. Altered Hepa1-6 cells by dimethyl sulfoxide (DMSO)-treatment induce anti-tumor immunity in vivo.

    Jiang, Zhengyu; Zhang, Hongxia; Wang, Ye; Yu, Bin; Wang, Chen; Liu, Changcheng; Lu, Juan; Chen, Fei; Wang, Minjun; Yu, Xinlu; Lin, Jiahao; Pan, Xinghua; Wang, Pin; Zhu, Haiying


    Cancer immunotherapy is the use of the immune system to treat cancer. Our current research proposed an optional strategy of activating immune system involving in cancer immunotherapy. When being treated with 2% DMSO in culture medium, Hepa1-6 cells showed depressed proliferation with no significant apoptosis or decreased viability. D-hep cells, Hepa1-6 cells treated with DMSO for 7 days, could restore to the higher proliferation rate in DMSO-free medium, but alteration of gene expression profile was irreversible. Interestingly, tumors from D-hep cells, not Hepa1-6 cells, regressed in wild-type C57BL/6 mice whereas D-hep cells exhibited similar tumorigenesis as Hep1-6 cells in immunodeficient mice. As expected, additional Hepa1-6 cells failed to form tumors in the D-hep-C57 mice in which D-hep cells were eliminated. Further research confirmed that D-hep-C57 mice established anti-tumor immunity against Hepa1-6 cells. Our research proposed viable tumor cells with altered biological features by DMSO-treatment could induce anti-tumor immunity in vivo.

  12. Evaluation of human platelet lysate and dimethyl sulfoxide as cryoprotectants for the cryopreservation of human adipose-derived stem cells.

    Wang, Chuan; Xiao, Ran; Cao, Yi-Lin; Yin, Hong-Yu


    Cryopreservation provides an effective technique to maintain the functional properties of human adipose-derived stem cells (ASCs). Dimethylsulfoxide (DMSO) and fetal bovine serum (FBS) are frequently used as cryoprotectants for this purpose. However, the use of DMSO can result in adverse effects and toxic reactions and FBS can introduce risks of viral, prion, zoonose contaminations and evoke immune responses after injection. It is therefore crucial to reduce DMSO concentrations and use serum-free solution in the cryopreservation process. Human platelet lysate (PL) is a promising candidate for use as an alternative to DMSO and FBS. Therefore, in this study, with an aim to identify a cryoprotective agent for ASC cryopreservation, we determined the viability, proliferation potential, phenotype, and differentiation potential of fresh ASCs and ASCs cryopreserved using different combinations of three cryoprotective agents: fetal bovine serum (FBS), dimethylsulfoxide (DMSO), and human platelet lysate (PL). The viability of the ASCs cryopreserved with 90% FBS and 10% DMSO, 95% FBS and 5% DMSO, and 97% PL and 3% DMSO was >80%, and the proliferation potentials, cell phenotypes, and differentiation potentials of these groups were similar to those of fresh ASCs. Together, our findings suggest that a combination of 97% PL and 3% DMSO is an ideal cryoprotective agent for the efficient cryopreservation of human ASCs. Copyright © 2017 Elsevier Inc. All rights reserved.

  13. The use of dimethyl sulfoxide in contact lens disinfectants is a potential preventative strategy against contracting Acanthamoeba keratitis.

    Siddiqui, Ruqaiyyah; Aqeel, Yousuf; Khan, Naveed Ahmed


    Acanthamoeba castellanii is the causative agent of blinding keratitis. Though reported in non-contact lens wearers, it is most frequently associated with improper use of contact lens. For contact lens wearers, amoebae attachment to the lens is a critical first step, followed by amoebae binding to the corneal epithelial cells during extended lens wear. Acanthamoeba attachment to surfaces (biological or inert) and migration is an active process and occurs during the trophozoite stage. Thus retaining amoebae in the cyst stage (dormant form) offers an added preventative measure in impeding parasite traversal from the contact lens onto the cornea. Here, we showed that as low as 3% DMSO, abolished A. castellanii excystation. Based on the findings, it is proposed that DMSO should be included in the contact lens disinfectants as an added preventative strategy against contracting Acanthamoeba keratitis. Copyright © 2016 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.

  14. Tuning excited state isomerization dynamics through ground state structural changes in analogous ruthenium and osmium sulfoxide complexes.

    Garg, Komal; Engle, James T; Ziegler, Christopher J; Rack, Jeffrey J


    The complexes [Ru(bpy)2(pyESO)](PF6)2 and [Os(bpy)2(pyESO)](PF6)2, in which bpy is 2,2'-bipyridine and pyESO is 2-((isopropylsulfinyl)ethyl)pyridine, were prepared and studied by (1)H NMR, UV-visible and ultrafast transient absorption spectroscopy, as well as by electrochemical methods. Crystals suitable for X-ray structural analysis were grown for [Ru(bpy)2(pyESO)](PF6)2. Cyclic voltammograms of both complexes provide evidence for S→O and O→S isomerization as these voltammograms are described by an ECEC (electrochemical-chemical electrochemical-chemical) mechanism in which isomerization follows Ru(2+) oxidation and Ru(3+) reduction. The S- and O-bonded Ru(3+/2+) couples appear at 1.30 and 0.76 V versus Ag/AgCl in propylene carbonate. For [Os(bpy)2(pyESO)](PF6)2, these couples appear at 0.97 and 0.32 V versus Ag/AgCl in acetonitrile, respectively. Charge-transfer excitation of [Ru(bpy)2(pyESO)](PF6)2 results in a significant change in the absorption spectrum. The S-bonded isomer of [Ru(bpy)2(pyESO)](2+) features a lowest energy absorption maximum at 390 nm and the O-bonded isomer absorbs at 480 nm. The quantum yield of isomerization in [Ru(bpy)2(pyESO)](2+) was found to be 0.58 in propylene carbonate and 0.86 in dichloroethane solution. Femtosecond transient absorption spectroscopic measurements were collected for both complexes, revealing time constants of isomerizations of 81 ps (propylene carbonate) and 47 ps (dichloroethane) in [Ru(bpy)2(pyESO)](2+). These data and a model for the isomerizing complex are presented. A striking conclusion from this analysis is that expansion of the chelate ring by a single methylene leads to an increase in the isomerization time constant by nearly two orders of magnitude.

  15. The Effect of Diazoxide and Dimethyl Sulfoxide on Behavioral Outcomes and Markers of Pathology Following Controlled Cortical Impact


    34 differences between groups. 172 Morris Water Maze Performance As stated by Eric KandeL "Learning is the process by which we acquire knowledge...34Neuroanatomical correlation of behavioral deficits in the CCI model ofTBI," J Neurosci Methods, vol. 190. no. 1, pp. 1- 9.2010. 35. E. R. Kandel , J. H

  16. Controlled peeling of the surfaces of starch granules by gelatinization in aqueous dimethyl sulfoxide at selected temperatures.

    Mukerjea, Romila; Mukerjea, Rupendra; Robyt, John F


    Microscopic examination of starch granules in 90:10 (v/v) Me(2)SO-H(2)O indicated that the granules were slowly being gelatinized from their surfaces. The rate of gelatinization was dependent on two variables: (1) the amount of water in Me(2)SO and (2) the temperature. An increase of water in Me(2)SO and/or an increase in temperature increased the rate of gelatinization and vice versa. Specific ratios of Me(2)SO and H(2)O (85:15-95:5) and temperatures (0-15 degrees C) were found to give controlled sequential peeling/gelatinization of eight kinds of starch granules in 1-12h, with amounts of 10-25% gelatinization per hour. It was observed that the percent of starch granule remaining versus time gave curves that were linear and others that had linear parts separated by one or more abrupt changes. No two starches had a similar gelatinization curve for the same two conditions of the amount of water and the temperature. It is hypothesized that these curves reflect different structural characteristics for the individual kinds of starch granules.

  17. Effect of Cytochalasin B, Lantrunculin B, Colchicine, Cycloheximid, Dimethyl Sulfoxide and Ion Channel Inhibitors on Biospeckle Activity in Apple Tissue

    Kurenda, Andrzej; Pieczywek, Piotr M.; Adamiak, Anna; Zdunek, Artur


    The biospeckle phenomenon is used for non-destructive monitoring the quality of fresh fruits and vegetables, but in the case of plant tissues there is a lack of experimentally confirmed information about the biological origin of the biospeckle activity (BA). As a main sources of BA, processes associated with the movement inside the cell, such as cytoplasmic streaming, organelle movement and intra- and extracellular transport mechanisms, are considered. The aim of this study is to investigate ...

  18. Primary Eye Irritation Potential of the Holston Compounds: Virgin DMSO (Dimethyl Sulfoxide), DMSO Recycle Solvent, and DMSO Evaporator Sludge.


    Of the three animals tested in this group, none showed signs of corneal opacity or iritis (Tables 1 and 2). Slight conjunctival redness (score of 1...animals tested in this group showed signs of corneal opacity or iritis (Tables 5 and 6). Slight conjunctival redness was seen in all rabbits at the 1-hour...observation periods. TP015 As with TP013 and TP014, none of the animals tested in this group showed signs of corneal opacity or iritis (Tables 9 and 10

  19. Bis[μ-N-(pyridin-2-ylmethylpyridin-3-amine-κ2N:N′]disilver(I bis(perchlorate dimethyl sulfoxide disolvate

    Suk-Hee Moon


    Full Text Available In the binuclear title compound, [Ag2(C11H11N32](ClO42·2C2H6SO, the complex cation is centrosymmetric, with the unique AgI cation coordinated by two pyridine N atoms from two symmetry-related N-(pyridine-2-ylmethylpyridine-3-amine ligands in a geometry slightly distorted from linear [N—Ag—N = 170.78 (9°], resulting in the formation of a 16-membered cyclic dimer. The two pyridine rings coordinating to the AgI atom are almost perpendicular to each other [dihedral angle = 87.73 (10°]. Intermolecular Ag...O interactions [3.149 (3 and 2.686 (3 Å], N—H...O and C—H...O hydrogen bonds and C—H...π interactions between the cyclic dimers and the anions or the solvent molecules lead to the formation of a three-dimensional supramolecular network.

  20. Gamma-radiolysis of dimethyl sulfoxide. II. Radiolysis yields and possible mechanisms; Gamma-Radiolisis del dimetilsulfoxido II. Rendimientos radioloticos y posibles mecanismos

    Gutierrez, M. C.; Barrera, R.


    As result of quantitative studies on gamma-radiolysis of DMSO at a dose range of 90-850 Mrads, constant G values have been obtained for the following radiolysis compounds: G(-DMSO) - 6.7 {+-}0.2; G(dimethyl sulphide) - 3.4 {+-}0.3; G(methane) - 0,75 {+-} 0.04; G(dimethyl disulphide) -0.33 {+-}0,03; G(tri methylsulphonium methanesulphonate) - 0.26 {+-} 0,01; G(methyl methanethiosulphonate) - 0,25 {+-}0.02; G(dimethyl sulphona)-0.21{+-}0.02; G(H{sub 2})-0.18{+-}0.02; and G(propane)--0.0092{+-}0.0007. Initial G values have been obtained for other identified compounds: Gi(ethane)-0,46; Gi(CO)-0.052; and Gi(CO{sub 2})-0.030. Possible mechanisms on the radiolysis process are proposed. (Author) 17 refs.

  1. Synthesis and Crystal Structure of Monochloridehepta (dimethyl sulfoxide)gadolinium (Ⅲ) di(tetraphenyl boron) Salt [Gd(dmso) 7Cl][BPh4]2

    张道; 郭松山; 王汉章; 郁开北


    The crystal of the title compound (C62H82B2ClGdO7S7 Mr= 1378.02)is triclinic with space group P-1. a=12. 532(2), b=12. 774(2), c=24. 580(5)A; α=93.389(9), β=104. 640(8), γ=112. 923(9)°, V=3451.4(8)A3, Z=2, Dc=1.326g/cm3. μ(MoKα)=1. 258mm-1, F(000)=1426. R=0.036 , Rw= 0. 091for 12101 reflections with I>2σ(I). The crystal is composed of a discrete cation [Gd(dm-so )7Cl]+ and two anions [BPh4]-. The Gd( Ⅲ ) ion is coordinated by a chlorine and seven oxygen atoms from seven monodenate dimethylsulfoxides formimg a distorted square antiprism coordination polyhedron.

  2. CCDC 977701: Experimental Crystal Structure Determination : (2-(bis(2-Methoxyphenyl)phosphino)-N-(2-(trifluoromethyl)phenyl)benzenesulfonamidato)-(dimethyl sulfoxide)-methyl-palladium

    Jian, Zhongbao


    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  3. CCDC 860713: Experimental Crystal Structure Determination : catena-[dimethylammonium (mu-5,5'-ethyne-1,2-diyldiisophthalato)-indium N,N-dimethylformamide dimethyl sulfoxide solvate monohydrate

    Zheng, Bing


    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  4. Synthesis and Characterization of Sulfamic Acid-Functionalized Nanoparticles and Study of Its Catalytic Activity for the Oxidation of Sulfides to Sulfoxides

    Arash Ghorbani-Choghamarani


    Full Text Available The synthesis, characterization and applications of sulfamic acid-functionalized magnetic nanoparticles as a magnetically separable nanocatalyst are described. The nanostructure of the catalyst was characterized by FT-IR spectroscopy, thermogravimetric (TGA analysis, powder X-ray diffraction (XRD, scanning electron microscopy (SEM and transmission electron microscope (TEM. This work is licensed under a Creative Commons Attribution 4.0 International License.

  5. Problem Definition Studies on Potential Environmental Pollutants. 4. Physical, Chemical, Toxicological, and Biological Properties of Benzene; Toluene; Xylenes; and para-Chlorophenyl Methyl Sulfide, Sulfoxide, and Sulfone


    saturated solu-t:on killed the stem. Moore et al.111 and Meites 11 2 demonstrated the stimu-latory effect of benzene at ITw Eoncentrations to maize ...revealed by serum creatinine, blood urea (renal function), alkaline phosphatase, and serum bilirubin (liver function), has been reported recently. 31 44 Of...two survivors showed an elevated blood urea and reduced creatinine clearance in one and elevated serum transaoiinase in both, with ultimate recovery to

  6. CCDC 1036601: Experimental Crystal Structure Determination : bis(dimethyl sulfoxide)-(1,3,6,8,11,13,16,18-octaazapentacyclo[,6.18,11.113,16]tetracosa-4,9,14,19-tetraene-21,22,23,24-tetraylidene)-iron bis(hexafluorophosphate) dimethyl sulfoxide solvate

    Anneser, Markus R.


    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  7. CCDC 974613: Experimental Crystal Structure Determination : catena-[bis(mu-5,5',5''-(1,3,4,6,7,9,9b-heptaazaphenalene-2,5,8-triyltriimino)triisophthalato)-tris(dimethyl sulfoxide)-triaqua-hexa-copper dimethyl sulfoxide solvate hydrate

    Luebke, Ryan


    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  8. Transport of anthelmintic benzimidazole drugs by breast cancer resistance protein (BCRP/ABCG2)

    Merino, G; Jonker, JW; Wagenaar, E; Pulido, MM; Molina, AJ; Alvarez, AI; Schinkel, AH


    Methylcarbamate benzimidazoles [albendazole (ABZ), fenbendazole (FBZ), and their respective sulfoxide derivatives, albendazole sulfoxide (ABZSO) and oxfendazole (OXF)] are therapeutically important anthelmintic agents with low bioavailability. We studied their in vitro interaction with the apical AT

  9. Brain Damage from Soman-Induced Seizures Is Greatly Exacerbated by Dimethyl sulfoxide (DMSO): Modest Neuroprotection by 2-Aminoethyl diphenylborinate (2- APB), a Transient Receptor Potential Channel Inhibitor and Inositol 1,4,5-triphosphate Receptor Antagonist


    subcutaneous (s.c.) xylocaine was administered for local analgesia . Placement of screw electrodes was performed in accordance with the procedure... dental cement. On the morning of the fifth or sixth day following surgeries, electrode-implanted animals were connected to an ECoG recording

  10. Protective effect of dimethyl sulfoxide against renal injury induced by zymosan in rats%二甲基亚砜对酵母多糖诱导大鼠肾损伤的保护作用

    郑金光; 李雨梦; 白晓东; 高明娟; 王晓娜; 赵增凯; 李静远; 刘锐; 胡森


    目的 研究二甲基亚砜(DMSO)对酵母多糖诱导的大鼠肾脏损伤的保护作用.方法 将清洁级SD大鼠分为4组:SS组、SD组、ZS组及ZD组,每组各30只.ZS组和ZD组大鼠于腹腔注射750 mg/kg酵母多糖以制备肾损伤模型,SS组和SD组大鼠仅予以假手术操作.而后SD组与ZD组大鼠于1h后皮下注射3ml/kg DMSO,SS组与ZS组予以等剂量生理盐水.于造模后4、8、24h分批处死大鼠,每批10只.采用激光多普勒血流仪测定各时间点肾血流量,并抽取腹主动脉血检测肌酐水平,取肾组织测定其含水率、丙二醛(MDA)及髓过氧化物酶(MPO)活性.结果 造模后4、8、24 h,与SS组和SD组比较,ZS和ZD组肾血流量显著降低,肾组织含水率、MDA含量、MPO活性及血肌酐含量均显著升高(P均<0.05).且与ZS组比较,ZD组造模后4、8、24 h肾血流量明显升高[(119±13) BPU vs.(156±22) BPU;(103土11)BPU vs.(121±12)BPU;(87土11) BPU vs.(108±11) BPU],肾MDA含量显著降低[(6.2±0.6) nmol/mgPro vs.(5.3±0.4) nmol/mgPro;(9.1±0.9) nmol/mgPro vs.(5.6±0.5) nmol/mgPro;(10.7土1.0) nmol/mgPro vs.(6.7±0.6) nmol/mgPro].而ZD组肾含水率仅在8、24 h时[(75.7土2.2)%vs.(72.4±2.7)%;(79.2±2.3)%vs.(74.9±2.2)%],血肌酐含量仅在24 h时[(61.4±8.6)U/L vs.(36.5±6.7)U/L]较ZS组显著降低(P均<0.05).但两组大鼠肾MPO活性在各时间点比较,差异均无统计学意义(P均>0.05).结论 DMSO对酵母多糖引起的肾缺血和氧自由基损伤有显著的保护作用.

  11. 阿苯达唑亚砜及其对映体体外抗细粒棘球绦虫原头蚴作用%In Vitro Observation on Albendazole Sulfoxide and its Enantiomers against Echinococcus granulosus Protoscolex

    包根书; 张虹; 景涛; 乔华; 王静


    目的 观察阿苯达唑亚砜消旋体(ASOX)、左旋体(L-ASOX)和右旋体(D-ASOX)体外抗细粒棘球绦虫原头蚴作用.方法将细粒棘球绦虫原头蚴随机分为8组(每组约6 000个).分别置含6 ml DMEM培养液(含15%胎牛血清,青霉素和链霉素各500 U/m1)的培养瓶中,ASOX、L-ASOX和D.ASOX的各50μg/ml和100 μg/ml组分别加入各药液150 μl和300 μl(配制液含0.1%二甲基哑砜和0.1%吐温-80的蒸馏水),DMSO组中加入等量配制液,并没空白对照组,每组设2个平行组.每隔1 d观察1次,取样滴十玻片,用0.03%美蓝染色,显微镜下计数原头蚴约400个,计算死亡率.直至其中一组的原头蚴全部死亡为止.结果 ASOX、L-ASOX和D.ASOX两个浓度(50μg/ml和100 μg/ml)组不同作用时间原头蚴的死亡率分别与空白对照组和溶剂组相比,差异均有统计学意义(P0.05),而与L-ASOX组相比,差异有统计学意义(P<0.05);D-ASOX与L-ASOX相比,差异有统汁学意义(P<0.05).各药物作用至第9天时,ASOX、L-ASOX、D.ASOX的50 μg/m~组原头蚴死亡率分别为(93.6±3.7)%、(56.2±3.9)%和(99.0±1.9)%,各药的100μg/ml组死亡率分别为100%、(74.5±3.7)%和100%,对照组为(19.1±1.3)%,溶剂组为(22.5±1.9)%.结论 ASOX、L-ASOX和D-ASOX在体外均有抗细粒棘球绦虫原头蚴作用,D-ASOX抗原头蚴作用较L-ASOX强.

  12. 新型手性Schiff碱的合成及其在硫醚不对称氧化反应中的应用%Synthesis of a New Chiral Schiff Base and Its Application in Enantioselective Sulfoxidation

    唐红艳; 曾庆乐


    从(R)-BINOL出发,经4步反应合成了一种新型手性Schiff碱配体--(R)-1-(2-羟基萘-1-基)-3-{[(R)-1-苯基乙亚胺]甲基}萘-2-酚(4),其结构经1H NMR,13C NMR,IR和MS表征.以CCl4为溶剂,4/Ti(O-i-Pr)4/异丙基过氧化氢(2.0 eq)为催化体系,于0 ℃反应9 h的最佳反应条件下,产物甲基苯基亚砜的收率77%,66%ee.

  13. Treatment of Dimethyl Sulfoxide Wastewater in Cometabolic Aerobic Membrane Bioreactor%共代谢膜生物反应器法处理二甲基亚砜废水

    耿长君; 蒲文晶; 刘巍; 苗磊; 王宏伟; 张晓东


    采用蔗糖作为共代谢基质与一体式好氧膜生物反应器(MBR)工艺相结合处理二甲基亚砜(DMSO)废水.考察了装置的污泥驯化效果、DMSO去除率、污泥的性能、HRT和冲击负荷对DMSO去除率的影响.试验结果表明:驯化第29天,DMSO去除率达98.5%,表明MBR内的污泥已驯化成功;在MBR运行的正式期,当DMSO处于高负荷状态时,DMSO去除率较低;随蔗糖加入量的增加,DMSO去除率逐渐提高,最终恢复到DMSO高负荷冲击前的DMSO去除效果;正常运行时,装置进水ρ (DMSO) =257~1 448 mg/L(平均值为718 mg/L)、出水ρ(DMSO) =6~22 mg/L(平均值为7 mg/L),DMSO去除率为96.4%~99.6%(平均值为98.9%);在MBR运行的正式期,污泥体积指数小于100 mL/g,表明污泥的沉降性能较好,MLVSS/MLSS较高,表明污泥的活性高,MBR内MLSS的平均值为5.52 g/L,MLVSS的平均值为4.78 g/L; MBR适宜的HRT为12h.

  14. Effect of Dimethyl Sulfoxide on the Activity of NAGase from Yellow Mealworm( Tenebrio molitor Linnaeus)%二甲亚砜对黄粉虫NAGase活力的影响

    谢进金; 陈丽娟


    研究二甲亚砜(DMSO)对黄粉虫(Tenebrio molitor Linnaeus)N-乙酰-β-D-氨基葡萄糖苷酶活力(NAGase)的影响.结果表明:该酶的剩余活力随着二甲亚砜浓度增大而呈指数下降,导致酶活力丧失50%的二甲亚砜的浓度(抑制半衰期,IC50)为5%,说明二甲亚砜对黄粉虫NA-Gase有明显的失活作用.该酶的失活过程属于可逆过程,抑制机理表现为混合型抑制类型,进一步测定游离酶(E)和底物络合物(ES)与二甲亚砜的结合常数(KI和KIS),分别为6.12%和26.2%,KI<KIS,说明底物存在对酶被二甲亚砜的失活作用有一定的保护作用.

  15. CCDC 894987: Experimental Crystal Structure Determination : (2-(1,3-bis(2,6-Di-isopropylphenyl)-1,3,2-diazaphospholidin-2-yl)benzenesulfonato)-(dimethyl sulfoxide-O)-methyl-palladium(ii)

    Wucher, Philipp


    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

  16. NCBI nr-aa BLAST: CBRC-ACAR-01-1003 [SEVENS

    Full Text Available CBRC-ACAR-01-1003 ref|YP_911911.1| peptide methionine sulfoxide reductase [Chlorobium phaeobacteroides... DSM 266] gb|ABL65487.1| peptide methionine sulfoxide reductase [Chlorobium phaeobacteroides DSM 266] YP_911911.1 4.0 30% ...

  17. Effects of γ-Glutamyl-transpeptidase and Cysteine Sulfoxide Lyase on Endogenous Formaldehyde Production in Shiitake Mushroom%γ-谷氨酰转肽酶和半胱氨酰亚砜裂解酶对香菇内源性甲醛形成的作用

    黄菊; 吴宁; 宋君; 张蕾; 姜天甲; 励建荣


    香菇在产生其风味物质的同时,甲醛等物质作为副产物而伴随产生.γ-谷氨酰转肽酶(GGT)和半胱氨酰亚砜裂解酶(C-S lyase)是风味形成途径中的两个关键酶,但是它们与香菇内源性甲醛形成的关系还未经证实.本试验中通过研究香菇生长阶段甲醛含量、GGT和C-S lyase的活性变化规律发现:甲醛含量及GGT、C-Slyase的酶活均随着香菇的成熟而逐渐增加(p<0.05);将不同浓度GGT和C-S lyase添加到香菇匀浆中一段时间,发现甲醛的含量较对照组均有显著升高(p<0.05).上述结果表明:GGT和C-S lyase能促进甲醛在香菇中的形成,二者协同下的效果更加明显,为香菇中风味形成途径与甲醛形成之间的关系提供了新的证据.

  18. Determination of Albendazole Sulfoxide Metabolites and Albendazole Sulfone by Liquid Chromatographic-Tandem Mass Spectrometry in Tissues of Pigs%猪组织中丙硫咪唑亚砜和砜含量的液质联用测定方法的研究

    徐雪; 董靖; 邓彦宏; 邓旭明


    采用液质联用方法检测了动物组织(肌肉、肝脏、肾脏、肌肉)中丙硫咪唑亚砜和丙硫咪唑砜含量,采用液液分配的提取方法,用乙酸乙酯、正己烷和甲醇:水(80:20,V/V)对样品进行处理和净化,welchrom-C(4.6 mm×250 mm,5μm)色谱柱进行液相色谱一质谱法分析.结果显示以S/N=3为检测限,该方法亚砜在各组织中的检测限为0.174 mg/kg,砜的检测限为0.066 mg/kg,各组织的平均添加回收率均在85%以上,证实方法达到药物残留检测的要求.

  19. Measurement of the Absolute Raman Cross Sections of Diethyl Phthalate, Dimethyl Phthalate, Ethyl Cinnamate, Propylene Carbonate, Tripropyl Phosphate, 1,3-Cyclohexanedione, 3’-Aminoacetophenone, 3’-Hydroxyacetophenone, Diethyl Acetamidomalonate, Isovanillin, Lactide, Meldrum’s Acid, p-Tolyl Sulfoxide, and Vanillin


    Propylene Carbonate , Tripropyl Phosphate, 1,3-Cyclohexanedione, 3’-Aminoacetophenone, 3’-Hydroxyacetophenone, Diethyl Acetamidomalonate, Isovanillin...Cross Sections of Diethyl Phthalate, Dimethyl Phthalate, Ethyl Cinnamate, Propylene Carbonate , Tripropyl Phosphate, 1,3-Cyclohexanedione, 3...been determined for the Raman cross section σR of neat Diethyl phthalate (DEP), dimethyl phthalate (DMP), ethyl cinnamate (EC), propylene carbonate

  20. Matrix-assisted laser desorption ionization time-of-flight mass spectrometric analysis of degradation products after treatment of methylene blue aqueous solution with three-dimensionally integrated microsolution plasma

    Shirafuji, Tatsuru; Nomura, Ayano; Hayashi, Yui; Tanaka, Kenji; Goto, Motonobu


    Methylene blue can be degraded in three-dimensionally integrated microsolution plasma. The degradation products have been analyzed by matrix-assisted laser desorption ionization time-of-flight (MALDI TOF) mass spectrometry to understand the degradation mechanisms. The results of MALDI TOF mass spectrometry have shown that sulfoxide is formed at the first stage of the oxidation. Then, partial oxidation proceeds on the methyl groups left on the sulfoxide. The sulfoxide is subsequently separated to two benzene derivatives. Finally, weak functional groups are removed from the benzene derivatives.

  1. Determination of sulfur compounds in hydrotreated transformer base oil by potentiometric titration.

    Chao, Qiu; Sheng, Han; Cheng, Xingguo; Ren, Tianhui


    A method was developed to analyze the distribution of sulfur compounds in model sulfur compounds by potentiometric titration, and applied to analyze hydrotreated transformer base oil. Model thioethers were oxidized to corresponding sulfoxides by tetrabutylammonium periodate and sodium metaperiodate, respectively, and the sulfoxides were titrated by perchloric acid titrant in acetic anhydride. The contents of aliphatic thioethers and total thioethers were then determined from that of sulfoxides in solution. The method was applied to determine the organic sulfur compounds in hydrotreated transformer base oil.

  2. An improved extraction chromatographic resin for the separation of uranium from acidic nitrate media

    Dietz, M.L.; Horwitz, E.P.; Sajdak, L.R.; Chiarizia, R. [Chemistry Division, Argonne National Laboratory, 60439 Argonne, IL (United States)


    The preparation and characterization of a new extraction chromatographic resin exhibiting extraordinarily strong retention of hexavalent uranyl ion over a wide range of nitric acid concentrations and very high selectivity for U(VI) over Fe(III) and numerous other cations is described. This new material (designated U/TEVA-2) comprises a novel liquid stationary phase consisting of an equimolar mixture of diamyl amylphosphonate (DA[AP]) and Cyanex 923{sup registered} (a commercially available trialkyl-phosphine oxide, TRPO) sorbed on silanized silica or Amberchrom CG-71. Cyanex 923 is shown to be preferable to a related TRPO, Cyanex 925{sup registered}, due to its lower viscosity and higher selectivity for U(VI) over Fe(III). The retention of uranyl nitrate by the U/TEVA-2 resin, as measured by the k' values (number of free column values to peak maximum) is >5000 from approximately 0.1 to 8 M HNO{sub 3}. The ability of the new resin to strongly and selectively retain U(VI) from such a wide range of acid concentrations, along with its favorable physical properties, make it a good candidate for application in the separation and preconcentration of U(VI) from complex environmental, biological, and nuclear waste samples for subsequent determination.

  3. An improved extraction chromatographic resin for the separation of uranium from acidic nitrate media.

    Dietz, M L; Horwitz, E P; Sajdak, L R; Chiarizia, R


    The preparation and characterization of a new extraction chromatographic resin exhibiting extraordinarily strong retention of hexavalent uranyl ion over a wide range of nitric acid concentrations and very high selectivity for U(VI) over Fe(III) and numerous other cations is described. This new material (designated U/TEVA-2) comprises a novel liquid stationary phase consisting of an equimolar mixture of diamyl amylphosphonate (DA[AP]) and Cyanex 923((R)) (a commercially available trialkyl-phosphine oxide, TRPO) sorbed on silanized silica or Amberchrom CG-71. Cyanex 923 is shown to be preferable to a related TRPO, Cyanex 925((R)), due to its lower viscosity and higher selectivity for U(VI) over Fe(III). The retention of uranyl nitrate by the U/TEVA-2 resin, as measured by the k' values (number of free column values to peak maximum) is >5000 from approximately 0.1 to 8 M HNO(3). The ability of the new resin to strongly and selectively retain U(VI) from such a wide range of acid concentrations, along with its favorable physical properties, make it a good candidate for application in the separation and preconcentration of U(VI) from complex environmental, biological, and nuclear waste samples for subsequent determination.

  4. Determination of phthalates released from paper packaging materials by solid-phase extraction-high-performance liquid chromatography.

    Gao, Xin; Yang, Bofeng; Tang, Zhixu; Luo, Xin; Wang, Fengmei; Xu, Hui; Cai, Xue


    A solid phase extraction (SPE) high-performance liquid chromatography (HPLC) method was developed for the simultaneous determination of 10 phthalic acid esters (dimethyl phthalate, diethyl phthalate, dipropyl phthalate, benzylbutyl phthalate, diisobutyl phthalate, dicyclohexyl phthalate, diamyl phthalate, di-n-hexyl phthalate, di-n-octyl phthalate and di-2-ethylhexyl phthalate) released from food paper packaging materials. The use of distilled water, 3% acetic acid (w/v), 10% ethanol (v/v) and 95% ethanol (v/v) instead of the different types of food simulated the migration of 10 phthalic acid esters from food paper packaging materials; the phthalic acid esters in four food simulants were enriched and purified by a C18 SPE column and nitrogen blowing, and quantified by HPLC with a diode array detector. The chromatographic conditions and extraction conditions were optimized and all 10 of the phthalate acid esters had a maximum absorbance at 224 nm. The method showed limitations of detection in the range of 6.0-23.8 ng/mL the correlation coefficients were greater than 0.9999 in all cases, recovery values ranged between 71.27 and 106.97% at spiking levels of 30, 60 and 90 ng/mL and relative standard deviation values ranged from 0.86 to 8.00%. The method was considered to be simple, fast and reliable for a study on the migration of these 10 phthalic acid esters from food paper packaging materials into food.

  5. Regiospecific Addition of Uracil to Acrylates Catalyzed by Alkaline Protease from Bacillus subtilis

    Ying CAI; Jian Yi WU; Na WANG; Xiao Feng SUN; Xian Fu LIN


    Michael addition reactions of uracil to acrylates were catalyzed by an alkaline protease from Bacillus subtilis in dimethyl sulfoxide at 55 ℃ for 72 h. The adducts were determined by TLC, IR and 1H NMR.

  6. Characterization and antitumor activity of camptothecin from ...

    the residue was applied on silica gel thin layer chromatog- raphy (TLC) plates. ... Three replicates were prepared for ... MTT and dimethyl sulfoxide (DMSO) were added to the ..... ether from the endophytic fungus, Coniothyrium sp. Jour-.

  7. Antiglycation Activity of Otostegia persica (Burm.) Boiss



    Jun 14, 2010 ... Glycation and AGEP formation are also accompanied by the formation of free radicals via ... Abbreviations: DMSO, Dimethyl sulfoxide; BSA, bovine serum .... over silica gel and eluted with petroleum ether/EtOAc (58:42 and.

  8. ClEST cluster :Cl_singleton0088 [ClEST

    Full Text Available ACTGCGAAATCGAAACTCCAGTACACTTCGTTCATATTTTAC fb06016 1 peptide methionine sulfoxide reductase MsrA [Triatoma matogrossensis] ADN29867 4.31931E-63 GO:0008113 GO:0055114 GO:0006464 ...

  9. Photostimulated SRN 1 Reactions of Benzyl Chloride with Carbazolyl Nitrogen Anion


    The photostimulated reactions of benzyl chloride with carbazolyl nitrogen anion in dimethyl sulfoxide gave 9-benzylcarbazole and 3-benzylcarbazole.The reactions are suggested in term of SRN1 mechanism of nucleophilic substitution.

  10. DMSO induces dehydration near lipid membrane surfaces

    Cheng, Chi-Yuan; Song, Jinsuk; Pas, Jolien; Meijer, Lenny H H; Han, Songi


    Dimethyl sulfoxide (DMSO) has been broadly used in biology as a cosolvent, a cryoprotectant, and an enhancer of membrane permeability, leading to the general assumption that DMSO-induced structural changes in cell membranes...

  11. Antioxidant and Anti-proliferative Activities of Flavonoids from ...

    sequentially with petroleum ether, ethyl acetate and n-butyl alcohol to obtain petroleum ether, ethyl .... Methanol, ethanol, petroleum ether, ethyl ... diammonium salt (ABTS), dimethyl sulfoxide ..... light at 734 nm, which will be converted back to.

  12. Flavin-catalyzed aerobic oxidation of sulfides and thiols with formic acid/triethylamine.

    Murahashi, Shun-Ichi; Zhang, Dazhi; Iida, Hiroki; Miyawaki, Toshio; Uenaka, Masaaki; Murano, Kenji; Meguro, Kanji


    An efficient and practical catalytic method for the aerobic oxidative transformation of sulfides into sulfoxides, and thiols into disulfides with formic acid/TEA in the presence of a new, readily available, and stable flavin catalyst 5d is described.

  13. AHPCRC (Army High Performance Computing Rsearch Center) Bulletin. Volume 1, Issue 4


    as glycerol or dimethyl sulfoxide (DMSO) to prevent agglomera- tion, then freeze-drying them (lyophilization). The platelets are thawed and...the reform and improvement of mathematics and science education by appropriate incorporation of computational and communication technologies. Our

  14. Asymmetric synthesis of polypiperylene on a lanthanide-containing catalyst

    Monakov, Yu.B.; Marina, N.G.; Kozlova, O.I.; Kanzafarov, F.Ya.; Tolstikov, G.A.


    The authors study the polymerization of piperylene and subsequent synthesis of polypiperylene on a neodymium chloride catalyst containing a sulfoxide and an aluminium complex. Specifics of the catalyst preparation and activity are given.

  15. Phytotoxic characterization of various fractions of Launaea ...



    Jun 15, 2011 ... Abbreviations: DMSO, Dimethyl sulfoxide; LPME, Launaea procumbens ... 1, non treated control; 2, n-hexane fraction; 3, ethyl acetate fraction; ... fractionated using n-hexane, ethyl acetate, chloroform, butanol and distilled ...

  16. Chemical components from Aloe and their inhibition of indoleamine 2, 3-dioxygenase

    Ya Nan Sun


    Abbreviation used: IDO: inhibit indoleamine 2, 3-dioxygenase, TMS: tetramethylsilane, HMQC: heteronuclear multiple quantum correlation, HMBC: heteronuclear multiple bond correlation, COSY: 1H-1H correlation spectroscopy, ESI-MS: Electrospray ionization mass spectrometry, DMSO: dimethyl sulfoxide

  17. Synthesis, characterization, antimicrobial activity and molecular ...

    Synthesis, characterization, antimicrobial activity and molecular .... The solid product was filtered, washed with ether (3 × 20 ... dimethyl sulfoxide (DMSO) to obtain 5120 mg/mL ...... catalysts for direct diastereo-and regioselective Mannich.

  18. A new class of organocatalysts: sulfenate anions.

    Zhang, Mengnan; Jia, Tiezheng; Yin, Haolin; Carroll, Patrick J; Schelter, Eric J; Walsh, Patrick J


    Sulfenate anions are known to act as highly reactive species in the organic arena. Now they premiere as organocatalysts. Proof of concept is offered by the sulfoxide/sulfenate-catalyzed (1-10 mol%) coupling of benzyl halides in the presence of base to generate trans-stilbenes in good to excellent yields (up to 99%). Mechanistic studies support the intermediacy of sulfenate anions, and the deprotonated sulfoxide was determined to be the resting state of the catalyst.

  19. The MsrA knockout mouse exhibits abnormal behavior and brain dopamine levels

    Oien, Derek B.; Osterhaus, Greg L.; Latif, Shaheen A.; Pinkston, Jonathan W.; Fulks, Jenny; Johnson, Michael; Fowler, Stephen C.; Moskovitz, Jackob


    Oxidative stress can cause methionine oxidation that has been implicated in various proteins malfunctions, if not adequately reduced by the methionine sulfoxide reductase system. Recent evidence has found oxidized methionine residues in neurodegenerative conditions. Previously, we have described elevated levels of brain pathologies and an abnormal walking pattern in the methionine sulfoxide reductase A knockout (MsrA−/−) mouse. Here we show that MsrA−/− mice have compromised complex task lear...

  20. Pyrolysis of organic compounds. 1. Flash vacuum pyrolysis (FVP) of coal-model organo sulfides and their S-oxides

    Davis, F.A.; Panunto, T.W.; Awad, S.B.; Billmers, R.L.; Squires, T.G.


    The primary pyrolysis reaction of sulfides, sulfoxides, and sulfones (1-3), in the gas phase at 500-900 /sup 0/C, is homolytic cleavage of the C-SO/sub n/ bond. The order of reactivity, sulfoxide >> sulfone > sulfide, is consistent with the relative stabilities of the radicals produced. At 900/sup 0/C a novel and synthetically useful rearrangement of dibenzothiophene 5-oxide to 1-hydroxydibenzothiophene was observed. 21 references, 1 table.

  1. Engineered Citrobacter freundii methionine γ-lyase effectively produces antimicrobial thiosulfinates.

    Morozova, Elena A; Kulikova, Vitalia V; Rodionov, Alexei N; Revtovich, Svetlana V; Anufrieva, Natalya V; Demidkina, Tatyana V


    Antimicrobial activity of thiosulfinates in situ produced by mixtures of Citrobacter freundii methionine γ-lyase (MGL) with new substrates, l-methionine and S-(alkyl/allyl)-l-cysteine sulfoxides has been recently demonstrated (Anufrieva et al., 2015). This opens a way to the rational design of a new biotechnologically relevant antimicrobial drug producer. To increase the efficiency of the enzyme toward sulfoxides, the mutant forms of MGL, with the replacements of active site cysteine 115 with alanine (C115A MGL) and histidine (C115H MGL) were obtained. The replacement of cysteine 115 by histidine results in the loss of activity of the mutant enzyme in the γ-elimination reaction of physiological substrate, whereas the activity in the β-elimination reaction of characteristic substrates persists. However, the catalytic efficiency of C115H MGL in the β-elimination reaction of S-substituted l-cysteine sulfoxides is increased by about an order of magnitude compared to the wild type MGL. The antibacterial activity of C115H MGL mixtures with a number of sulfoxides was assessed against Gram-positive and Gram-negative bacteria. The bacteriostatic effect was more pronounced against Gram-positive than against Gram-negative bacteria, while antibacterial potential proved to be quite similar. Thus, the mutant enzyme C115H MGL is an effective catalyst, in particular, for decomposition of sulfoxides and the pharmacological couples of the mutant form with sulfoxides might be new antimicrobial agents.

  2. Modified E-test by the addition of EDTA-Tris and dimethyl sulfoxide on the potentiation of the effects of some antimicrobials in Pseudomonas aeruginosa strains isolated from bovine mastitis E-test modificado pela adição de Tris-EDTA e dimetilsulfóxido na potencialização do efeito de antimicrobianos em linhagens de Pseudomonas aeruginosa isoladas de mastite bovina

    M.G. Ribeiro


    Full Text Available A concentração inibitória mínima-MIC em 30 estirpes de Pseudomonas aeruginosa isoladas de mastite bovina foi avaliada utilizando o E-test padrão e o método modificado, pela adição de Tris-EDTA e DMSO. Os métodos modificados apresentaram redução significativa da MIC das estirpes utilizando a gentamicina, a ciprofloxacina e a norfloxacina.

  3. Hepatic microsomal metabolism of the anthelmintic benzimidazole fenbendazole: enhanced inhibition of cytochrome P450 reactions by oxidized metabolites of the drug.

    Murray, M; Hudson, A M; Yassa, V


    Potentiation of the anthelmintic action of benzimidazole carbamates, such as fenbendazole [methyl 5(6)-(phenylthio)-1H-benzimidazol-2-ylcarbamate], has been noted during concurrent administration of benzimidazoles that possess no intrinsic anthelmintic activity. This study investigated the possibility that inhibition of P450 enzymes by fenbendazole and its metabolites could play a role in the potentiation phenomenon. Fenbendazole underwent P450-mediated oxidation in microsomes from untreated rat liver to the sulfoxide and (4'-hydroxyphenyl)thio metabolites [2.92 and 2.87 nmol/(mg of protein.h)]. Pretreatment of rats with phenobarbital or dexamethasone enhanced sulfoxidation by 1.9- and 2.9-fold, respectively. 4'-Hydroxylation was increased slightly (by 28%) by phenobarbital and decreased slightly (by 41%) by dexamethasone. Induction also promoted further metabolism of the sulfoxide to fenbendazole sulfone. Immunoinhibition and chemical inhibition studies suggested that P450 3A proteins and the flavin-containing monooxygenase are involved in sulfoxide and sulfone formation whereas 4'-hydroxylation involved the P450s 2C11, 2C6, and 2B1, depending on the type of induction. In untreated rat liver, the sulfoxide and (4'-hydroxyphenyl)thio metabolites of fenbendazole were relatively potent inhibitors of P450-mediated androstenedione 16 alpha-, 16 beta-, and 6 beta-hydroxylation (IC50 values of 42, 36, and 74 microM, respectively); 7 alpha-hydroxylase activity was uninhibited. In contrast, fenbendazole and its sulfone metabolite were not inhibitors of these reactions. Mixed-function oxidase activities in phenobarbital-induced rat hepatic microsomes were refractory to inhibition by most compounds, but P450 1A1 mediated activities in microsomes from beta-naphthoflavone-induced rat liver were quite susceptible to inhibition by fenbendazole sulfoxide. Studies with two analogous sulfoxides yielded similar findings.(ABSTRACT TRUNCATED AT 250 WORDS)

  4. [Determination of phthalic acid esters in textiles by solid phase extraction-gas chromatography].

    Niu, Zengyuan; Ye, Xiwen; Fang, Liping; Xue, Qiuhong; Sun, Zhongsong


    A method was established for the simultaneous determination of some phthalic acid esters, namely, dimethyl phthalate (DMP), diethyl phthalate (DEP), dipropyl phthalate (DPrP), dibutyl phthalate (DBP), diamyl phthalate (DAP), dihexyl phthalate (DHP), benzyln-butyl phthalate (BBP), di-(2-ethylhexyl) phthalate (DEHP), dicyclohexyl phthalate (DCHP), di-n-octyl phthalate (DNOP), diisononyl phthalate (DINP) and diisodecyl phthalate (DIDP) in textiles by solid phase extraction (SPE) coupled with gas chromatography (GC). The phthalic acid esters in textiles were extracted by Soxhlet extraction with hexane, the extracts were then cleaned up and enriched by a strong anion exchange (SAX) SPE cartridge. The parameters affecting the purification efficiency of SPE cartridge, such as solvent conditioning, rinsing, and elution, were studied. Conditioning with 5 mL hexane and rinsing with 3 mL isooctane were proved to be the optimal conditions. Of the several solvent ratios (ethylacetate in hexane) used for selective elution of phthalic acid esters from the SAX SPE cartridge, the 15% (v/v) content for ethylacetate in hexane gave the best result. Under the optimized conditions, the recoveries of phthalic acid esters for spiked standards (n=7) were 86.3%-102.7%, and the relative standard deviations (RSDs) were less than 5%. In this method the detection limits for DMP, DEP, DPrP, DBP, DAP, BBP, DCHP, DEHP, DNOP were all below 1 mg/kg, and the detection limits for DINP and DIDP were 1.74 mg/kg and 1.55 mg/kg respectively. This SPE-GC method is sensitive, accurate and suitable for the analysis of phthalate environmental hormones in textiles.

  5. Influence of structural factors on the thermal stability of zinc{sup (II)} and boron{sup (III)} complexes with iodo- and bromosubstituted 2,2′-dipyrrines

    Guseva, G.B., E-mail:; Antina, E.V.; Nuraneeva, E.N.


    Highlights: • Halogenated zinc{sup (II)} and boron{sup (III)} dipyrrinates are thermal stable up to 179–266 °C in argon. • Intramolecular red-ox-reactions are the main cause of the lowering of stability complexes. • Stability of complexes is increased when passing from I- to Br-substituted dipyrrinates. • The obtained results are interest in the development of laser dyes and sensors for PDT. - Abstract: The results of the analysis of thermal stability for zinc {sup (II)} and boron {sup (III)} complexes with 3,3′,5,5′-tetramethyl-4-ethyl-4′-iodo-2,2-dipyrrin [HL{sup 1}], 3,3′-diamyl-4,4′-dimethyl-5,5′-dibromo-2,2′-dipyrrin [HL{sup 2}] and 3,3′,5,5′-tetramethyl-4,4′-dibromo-2,2′-dipyrrin [HL{sup 3}] of the composition [Zn(L{sup 1}){sub 2}]–[Zn(L{sup 3}){sub 2}] and [BF{sub 2}L{sup 1}]–[BF{sub 2}L{sup 3}] are presented. The influence of halogenation of dipyrrin ligand is manifested in decreasing thermal stability of [Zn(L){sub 2}] and [BF{sub 2}L] when replacing 4,4′-dibromosubstituted dipyrrin on 5,5′-dibromo- or 4-monoiodosubstituted ligand. Intramolecular red-ox-reactions with participation of halogen atoms are the main cause of thermal stability lowering of dipyrrinates [Zn(L){sub 2}] and [BF{sub 2}L] compared with alkylsubstituted analogs. The obtained results are interesting for the development of laser dyes and sensors for PDT.

  6. Hexavalent Americium Recovery Using Copper(III) Periodate

    McCann, Kevin; Brigham, Derek M.; Morrison, Samuel; Braley, Jenifer C.


    Separation of americium from the lanthanides is considered one of the most difficult separation steps in closing the nuclear fuel cycle. One approach to this separation could involve oxidizing americium to the hexavalent state to form a linear dioxo cation while the lanthanides remain as trivalent ions. This work considers aqueous soluble Cu3+ periodate as an oxidant under molar nitric acid conditions to separate hexavalent Am with diamyl amylphosphonate (DAAP) in n-dodecane. Initial studies assessed the kinetics of Cu3+ periodate auto-reduction in acidic media to aid in development of the solvent extraction system. Following characterization of the Cu3+ periodate oxidant, solvent extraction studies optimized the recovery of Am from varied nitric acid media and in the presence of other fission product, or fission product surrogate, species. Short aqueous/organic contact times encouraged successful recovery of Am (distribution values as high as 2) from nitric acid media in the absence of redox active fission products. In the presence of a post-PUREX simulant aqueous feed, precipitation of tetravalent species (Ce, Ru, Zr) occurred and the distribution values of 241Am were suppressed, suggesting some oxidizing capacity of the Cu3+ periodate is significantly consumed by other redox active metals in the simulant. The manuscript demonstrates Cu3+ periodate as a potentially viable oxidant for Am oxidation and recovery and notes the consumption of oxidizing capacity observed in the presence of the post-PUREX simulant feed will need to be addressed for any approach seeking to oxidize Am for separations relevant to the nuclear fuel cycle.

  7. S-carboxymethyl-L-cysteine and it (R/S)-S-oxides in beagle dog plasma and hepatic cytosol.

    Panagopoulos, Panayotis; Mitchell, Stephen C; Steventon, Glyn B


    1. Incubation of beagle hepatic cytosol, under conditions promoting phenylalanine hydroxylase activity, led to the formation of the sulfoxide derivatives of S-carboxymethyl-L-cysteine, N-acetyl-S-carboxymethyl-L-cysteine, S-methyl-L-cysteine and N-acetyl-S-methyl-L-cysteine. Thiodiglycolic acid was not a substrate. Enzyme kinetic parameters (Km, Vmax) were derived indicating S-carboxymethyl-L-cysteine had the greatest clearance; no enantioselective preference was observed for this S-oxygenation reaction. 2. Following oral administration of S-carboxymethyl-L-cysteine to beagle dogs, the parent substance and its sulfoxide were the only compounds identified in the plasma. Pharmacokinetic data have been obtained indicating that the small amount of sulfoxide formed persisted within the body for longer than the parent material, but that the majority of the ingested dose remained in the administered sulfide form. 3. The sulfide moiety within the muco-regulatory drug, S-carboxymethyl-L-cysteine, is thought to be vital as it acts as a free radical scavenger, resulting in the inactive sulfoxide. Additional extensive enyzme-mediated sulfoxidation would decrease the amount of active sulfide available. In the dog this appears to not be an issue, signalling possible exploitation for therapeutic benefit in treating airway disease.

  8. Transformation of cefazolin during chlorination process: products, mechanism and genotoxicity assessment.

    Li, Liping; Wei, Dongbin; Wei, Guohua; Du, Yuguo


    Large quantities of cephalosporins have entered into aquatic environment in recent years, posing potential adverse effect to human health and ecological safety. In this study, cefazolin, one of widely used cephalosporins, was targeted to explore its transformation behaviors in chlorination disinfection process. With the help of ultra high performance liquid chromatography and high resolution mass spectroscopy, one chlorinated product and four oxidation products were detected in cefazolin chlorination system. The corresponding transformation pathways of cefazolin were proposed. Two kinds of reactions occurred in chlorination system, one was oxidation of thioether-sulfur to sulfoxide and di-sulfoxide, and the other was base-catalyzed electrophilic substitution of alpha-H of amide by chlorine atom. The pH value determined the occurrence of reaction types, and increasing chlorine dose promoted transformation of cefazolin. More importantly, genotoxicity in SOS/umu assay had an elevation after chlorination, which might be attributed to the formation of chlorinated product and sulfoxide during chlorination process.

  9. Synthesis and oxidation of some azole-containing thioethers

    Andrei S. Potapov


    Full Text Available Pyrazole and benzotriazole-containing thioethers, namely 1,5-bis(3,5-dimethylpyrazol-1-yl-3-thiapentane, 1,8-bis(3,5-dimethylpyrazol-1-yl-3,6-dithiaoctane and 1,3-bis(1,2,3-benzotriazol-1-yl-2-thiapropane were prepared and fully characterized. Oxidation of the pyrazole-containing thioether by hydrogen peroxide proceeds selectively to provide a sulfoxide or sulfone, depending on the amount of oxidant used. Oxidation of the benzotriazole derivative by hydrogen peroxide is not selective, and sulfoxide and sulfone form concurrently. Selenium dioxide-catalyzed oxidation of benzotriazole thioether by H2O2, however, proceeds selectively and yields sulfoxide only.

  10. Aerobic Linear Allylic C-H Amination: Overcoming Benzoquinone Inhibition.

    Pattillo, Christopher C; Strambeanu, Iulia I; Calleja, Pilar; Vermeulen, Nicolaas A; Mizuno, Tomokazu; White, M Christina


    An efficient aerobic linear allylic C-H amination reaction is reported under palladium(II)/bis-sulfoxide/Brønsted base catalysis. The reaction operates under preparative, operationally simple conditions (1 equiv of olefin, 1 atm O2 or air) with reduced Pd(II)/bis-sulfoxide catalyst loadings while providing higher turnovers and product yields than systems employing stoichiometric benzoquinone (BQ) as the terminal oxidant. Pd(II)/BQ π-acidic interactions have been invoked in various catalytic processes and are often considered beneficial in promoting reductive functionalizations. When such electrophilic activation for functionalization is not needed, however, BQ at high concentrations may compete with crucial ligand (bis-sulfoxide) binding and inhibit catalysis. Kinetic studies reveal an inverse relationship between the reaction rate and the concentration of BQ, suggesting that BQ is acting as a ligand for Pd(II) which results in an inhibitory effect on catalysis.

  11. Use of the steroid derivative RPR 106541 in combination with site-directed mutagenesis for enhanced cytochrome P-450 3A4 structure/function analysis.

    Stevens, J C; Domanski, T L; Harlow, G R; White, R B; Orton, E; Halpert, J R


    RPR 106541 (20R-16alpha,17alpha-[butylidenebis(oxy)]-6al pha, 9alpha-difluoro-11beta-hydroxy-17beta-(methylthio)androst a-4-en-3-one) is an airway-selective steroid developed for the treatment of asthma. Two metabolites produced by human liver microsomes were identified as R- and S-sulfoxide diastereomers based on liquid chromatography/mass spectrometry analysis, proton nuclear magnetic resonance, and cochromatography with standards. Sulfoxide formation was determined to be cytochrome P-450 (CYP) 3A4-dependent by correlation with CYP3A4-marker nifedipine oxidase activity, inhibition by cyclosporin A and troleandomycin, and inhibition of R- (70%) and S- (64%) sulfoxide formation by anti-3A antibody. Expressed CYP2C forms catalyzed RPR 106541 sulfoxidation; however, other phenotyping approaches failed to confirm the involvement of CYP2C forms in these reactions in human liver microsomes. Expressed CYP3A4 catalyzed the formation of the sulfoxide diastereomers in a 1:1 ratio, whereas CYP3A5 displayed stereoselectivity for formation of the S-diastereomer. The high rate of sulfoxidation by CYP3A4 and the blockage of oxidative metabolism at the electronically favored 6beta-position provided advantages for RPR 106541 over other substrates as an active site probe of CYP3A4. Therefore, oxidation of RPR 106541 by various CYP3A4 substrate recognition site (SRS) mutants was assessed. In SRS-4, A305V and F304A showed dramatically reduced rates of R-diastereomer formation (83 and 64% decreases, respectively), but S-diastereomer formation was affected to a lesser extent. A370V (SRS-5) showed decreased formation of the R-sulfoxide (52%) but increased formation of the S-diastereomer. In the SRS-2 region, the most dramatic change in sulfoxide ratios was observed for L210A. In conclusion, the structure of RPR 106541 imposes specific constraints on enzyme binding and activity and thus represents an improved CYP3A4 probe substrate.

  12. Dramatic Influence of Ionic Liquid and Ultrasound Irradiation on the Electrophilic Sulfinylation of Aromatic Compounds by Sulfinic Esters

    Ngoc-Lan Thi Nguyen


    Full Text Available The sulfinylation reaction of aromatic and hetero-aromatic compounds with sulfinic esters as electrophiles has been investigated in different ionic liquids and by means of different Lewis acid salts in order to get moderate to good yields of asymmetrical sulfoxides. Mixtures of 1-butyl-3-methylimidazolium chloride and aluminum chloride were found to be the most efficient and recyclable reaction framework. Ultrasound sonication appeared to be the most useful and green activation method to afford the sulfoxides in yields better than or equivalent to those obtained under the longer-lasting conventional stirring conditions.

  13. In situ generation and detection of methyl radical by voltammetry


    In persulfate-acetate, dimethyl sulfoxide or tert-butyl alcohol systems, in situ generation and detection of methyl free radical are realized with voltammetry. It includes the following successive processes. The persulfate S2O82- is polarographically reduced via one-electron addition to sulfate radical SO4-., the SO4-. Initiates chain reaction with acetate, dimethyl sulfoxide, or tert-butyl alcohol on the electrode surface to produce a methyl radical, and one-electron reduction of the methyl radical yields its polarographic reduction wave. In comparison with the known techniques such as ultraviolet radiolysis coupling with electron spin resonance, etc., the proposed method is simple, sensitive and selective.

  14. Determination of mepitiostane metabolites in human urine by liquid chromatography/tandem mass spectrometry for sports drug testing.

    Okano, Masato; Sato, Mitsuhiko; Kojima, Asami; Kageyama, Shinji


    Mepitiostane (2α,3α-epithio-17β-(1-methoxycyclopentyloxy)-5α-androstane), which is a prodrug of epitiostanol (2α,3α-epitio-5α-androstane-17β-ol), is an epitiosteroid having anti-estrogenic and weak androgenic anabolic activities. The World Anti-Doping Agency prohibits the misuse of mepitiostane by athletes. Detection of the urinary metabolites epitiostanol sulfoxide and epitiostanol was studied using liquid chromatography/mass spectrometry (LC-MS) for doping control purposes. The use of LC-MS provided advantages over gas chromatography/mass spectrometry for detecting heat labile steroids because epitiostanol and epitiostanol sulfoxide were primarily pyrolized to 5α-androst-2-en-17β-ol. The method consists of enzymatic hydrolysis using β-glucuronidase (Escherichia coli), liquid-liquid extraction, and subsequent ultra-performance liquid chromatography/electrospray-tandem mass spectrometry. Epitiostanol sulfoxide was determined at urinary concentrations of 0.5-50ng/mL, recovery was 76.2-96.9%, and assay precision was calculated as 0.9-1.7% (intra-day) and 2.0-6.6% (inter-day). Epitiostanol was determined at urinary concentrations of 0.5-50ng/mL, recovery was 26.1-35.6% and assay precision was calculated as 4.1-4.6% (intra-day) and 3.3-8.5% (inter-day). The limits of detection for epitiostanol sulfoxide and epitiostanol were 0.05ng/mL and 0.10ng/mL, respectively. Epitiostanol sulfoxide and epitiostanol, as their gluco-conjugates, were identified in human urine after oral administration of 10mg mepitiostane. Epitiostanol sulfoxide and epitiostanol could be detected up to 48h and 24h after administration, respectively. The results showed that the detection window of epitiostanol is much shorter than that of epitiostanol sulfoxide. The LC-MS detection of urinary epitiostanol sulfoxide, a specific metabolite with a sulphur atom in its molecular structure, is likely to be able to identify the abuse of mepitiostane.


    Preferred Customer

    was checked by thin layer chromatography on silica gel 60 F254 (Merck) and spots were ... petroleum ether (5:1) to give pale yellow needles of expected compounds ... (0.01 mol) was suspended in dimethyl sulfoxide (DMSO, 6 mL) and iodine ...

  16. Disulfiram generates a stable N,N-diethylcarbamoyl adduct on Cys-125 of rat hemoglobin beta-chains in vivo

    Erve, J C; Jensen, Ole Nørregaard; Valentine, H S


    Disulfiram (DSF) is a drug used in aversion therapy to treat alcoholics and acts by inhibiting mitochondrial low-K(m) aldehyde dehydrogenase. Investigations into the mechanisms for in vivo inactivation suggest that the DSF metabolite S-methyl-N, N-diethylthiocarbamate sulfoxide reacts irreversibly...

  17. Tert-butoxylering van halogeenpyridinen

    Zoest, van W.J.


    In this thesis an orientating investigation is described as a first contribution to the knowledge of the reactivities of monohalogenopyridines towards potassium tert -butoxide in dimethyl sulfoxide (DMSO) and tert -butylalcohol. It is connected with extensive studies carried out to date on the behav

  18. Immigrant Languages and the Dilemma of the Welfare State

    Nielsen, Helle Lykke


    methylglyoxal and glyoxal, in both cytosol and mitochondria. This finding suggests a role of detoxification systems in the age-related build-up of damaged proteins. Moreover, the oxidized protein repair system methionine sulfoxide reductase was more affected in the mitochondria than in the cytosol during...

  19. The oxidation of methionine-54 of epoetinum alfa does not affect molecular structure or stability, but does decrease biological activity.

    Labrenz, Steven R; Calmann, Melissa A; Heavner, George A; Tolman, Glen


    Erythropoietin therapy is used to treat severe anemia in renal failure and chemotherapy patients. One of these therapies based on recombinant human erythropoietin is marketed under the trade name of EPREX and utilizes epoetinum alfa as the active pharmaceutical ingredient. The effect of oxidation of methionine-54 on the structure and stability of the erythropoietin molecule has not been directly tested. We have observed partial and full chemical oxidation of methionine-54 to methionine-54 sulfoxide, accomplished using tert-Butylhydroperoxide and hydrogen peroxide, respectively. A blue shift in the fluorescence center of spectral mass wavelength was observed as a linear response to the level of methionine sulfoxide in the epoetinum alfa molecule, presumably arising from a local change in the environment near tryptophan-51, as supported by potassium iodide quenching studies. Circular dichroism studies demonstrated no change in the folded structure of the molecule with methionine oxidation. The thermal unfolding profiles of partial and completely oxidized epoetinum alfa overlap, with a T(m) of 49.5 degrees C across all levels of methionine sulfoxide content. When the protein was tested for activity, a decrease in biological activity was observed, correlating with methionine sulfoxide levels. An allosteric effect between Met54, Trp51, and residues involved in receptor binding is proposed. These results indicate that methionine oxidation has no effect on the folded structure and global thermodynamic stability of the recombinant human erythropoietin molecule. Oxidation can affect potency, but only at levels significantly in excess of those seen in EPREX.

  20. Design, Manufacture and Analysis of Tough, Nanostructure-Reinforced High-Performance Polymers


    by deprotonating macroscale, commercial Kevlar yarns using potassium hydroxide in dimethyl sulfoxide to yield stable dispersions of nanometer...validated against data obtained from polyurethane (PU)-Montmorillonite clay (MTM) nanocomposites. The goal of characterizing the mechanical response under... polyurethane based nanocomposites in future work. Personnel - PI: Ellen M Arruda Co-PIs: Nicholas A Kotov, M D Thouless, Anthony M Waas Graduate

  1. Pentamethylated and pentaphenylated azaferro- and azaruthenocenes: Simple and general methodology for the preparation of enantiopure derivatives

    Hansen, J.G.; Johannsen, Mogens


    A methodology for the enantioselective synthesis of planar chiral 2-substituted 1',2',3',4',5'-pentamethylazaferro- and azaruthenocenes is reported. The key step is the introduction of an enantiopure chiral sulfoxide auxiliary via a selective ortho-lithiation with subsequent chromatographic...

  2. Microbial Fuel Cell Transformation of Recalcitrant Organic Compounds in Support of Biosensor Research


    J. C. (2000). Effect of culture acclimation on the kinetics of aldicarb insecticide degradation under methanogenic conditions. Journal of Agricultural and Food Chemistry , 48...aldicarb sulfoxide, and aldicarb sulfone in Floridan groundwater. Journal of agricultural and food chemistry , 33(3), 455-460. Min, B., & Logan, B

  3. Effect of some organic solvents on oxidative phosphorylation in rat liver mitochondria

    Syed, Muzeeb; Skonberg, Christian; Hansen, Steen Honoré


    The effect of acetone, acetonitrile, dimethyl sulfoxide (DMSO), ethanol and methanol on oxidative phosphorylation (ATP synthesis) in rat liver mitochondria has been studied. All the organic solvents inhibited the oxidative phosphorylation in a concentration dependent manner, but with differences...... on oxidative phosphorylation in mitochondria should therefore include the use of relevant concentrations of the organic solvent in order to validate the contribution....

  4. Drug: D01043 [KEGG MEDICUS

    Full Text Available 43.gif Anti-inflammatory [topical] Same as: C11143 ATC code: G04BX13 M02AX03 Anatomical Therapeutic Chemical...JOINT AND MUSCULAR PAIN M02AX Other topical products for joint and muscular pain M02AX03 Dimethyl sulfoxide

  5. Novel and High Affinity 2-[(Diphenylmethyl)sulfinyl]acetamide (Modafinil) Analogues as Atypical Dopamine Transporter Inhibitors

    Cao, Jianjing; Slack, Rachel D.; Bakare, Oluyomi M.


    pharmacological profiles in animal models of cocaine and methamphetamine abuse. Herein, we report a series of modafinil analogues that have an atypical DAT inhibitor profile. We extended SAR by chemically manipulating the oxidation states of the sulfoxide and the amide functional groups, halogenating the phenyl...

  6. Synthesis and characterization of arabinose-palmitic acid esters by enzymatic esterification

    Pappalardo, Valeria M.; Boeriu, Carmen G.; Zaccheria, Federica; Ravasio, Nicoletta


    The direct esterification of palmitic acid with L-(+)-arabinose has been carried out. The use of Candida antartica lipase B as the catalyst and the choice of suitable solvent and experimental conditions allowed carrying out the reaction successfully. In particular 10% dimethyl-sulfoxide in

  7. Molecular dynamics study of the solvation of an alpha-helical transmembrane peptide by DMSO

    Duarte, A.M.; Mierlo, van C.P.M.; Hemminga, M.A.


    10-ns molecular dynamics study of the solvation of a hydrophobic transmembrane helical peptide in dimethyl sulfoxide (DMSO) is presented. The objective is to analyze how this aprotic polar solvent is able to solvate three groups of amino acid residues (i.e., polar, apolar, and charged) that are loca

  8. A novel cysteine desulfurase influencing organosulfur compounds in Lentinula edodes.

    Liu, Ying; Lei, Xiao-Yu; Chen, Lian-Fu; Bian, Yin-Bing; Yang, Hong; Ibrahim, Salam A; Huang, Wen


    Organosulfur compounds are the basis for the unique aroma of Lentinula edodes, and cysteine sulfoxide lyase (C-S lyase) is the key enzyme in this trait. The enzyme from Alliium sativum has been crystallized and well-characterized; however, there have been no reports of the characterization of fungi C-S lyase at the molecular level. We identified a L. edodes C-S lyase (Lecsl), cloned a gene of Csl encoded Lecsl and then combined modeling, simulations, and experiments to understand the molecular basis of the function of Lecsl. Our analysis revealed Lecsl to be a novel cysteine desulfurase and not a type of cysteine sulfoxide lyase. The pyridoxal-5-phosphate (PLP) molecule bonded tightly to Lecsl to form a Lecsl-PLP complex. Moreover, the Lecsl had one active center that served to bind two kinds of substrates, S-methyl-L-cysteine sulfoxide and L-cysteine, and had both cysteine sulfoxide lyase and cysteine desulfurase activity. We found that the amino acid residue Asn393 was essential for the catalytic activity of Lecsl and that the gene Csl encoded a novel cysteine desulfurase to influence organosulfur compounds in L. edodes. Our results provide a new insight into understanding the formation of the unique aroma of L. edodes.

  9. Thiacyclophane cages and related bi- and tripodal molecules via transient polysulfenic acids.

    Aversa, Maria Chiara; Barattucci, Anna; Bonaccorsi, Paola; Faggi, Cristina; Papalia, Teresa


    A series of bis- and tris-bridged thiacyclophane S-oxides, as racemates or meso products, have been synthesized with a new procedure. Starting from the corresponding thiols, in three steps, transient polyarene- and polyarylmethane-sulfenic acids were generated in the presence of di- and triethynylbenzenes. The thermal syn-addition of these sulfenic acids onto the triple bonds of the unsaturated acceptors was conducted in CH2Cl2 at 40 degrees C. The concentration of sulfoxide precursors of sulfenic acid and the sulfoxide/acceptor molar ratio addressed the syn-addition toward open-chain benzene sulfoxides or thiacyclophane S-oxides. Complete stereochemical control was observed in some reactions between polysulfenic acids and ethynylbenzenes, where the meso dithiacyclophane S,S'-dioxides were obtained exclusively, whereas 1:1 mixtures of meso/rac dithiacyclophanes S,S'-dioxides were isolated as products of other reactions. In almost all the cases, the obtained compounds were separated by column chromatography. The structure assignment of the new heterophanes was done on the basis of their diagnostic NMR spectra and X-ray crystallographic analysis of some of them. Open-chain polysulfinyl and polysulfinylmethyl benzenes, obtained as meso/rac mixtures, were separated and the products were fully characterized. Both synthesized cages, including trithia[3(3)](1,3,5)cyclophane S,S',S' '-trioxides, and bi- and tripodal benzene sulfoxides, appear promising in the field of coordination and material chemistry.

  10. Raman probes based on optically-poled double-clad fiber and coupler

    Brunetti, Anna Chiara; Margulis, Walter; Rottwitt, Karsten


    of a sample of dimethyl sulfoxide (DMSO), when illuminating the waveguide with 1064nm laser light. The Raman signal is collected in the inner cladding, from which it is retrieved with either a bulk dichroic mirror or a double-clad fiber coupler. The coupler allows for a substantial reduction of the fiber...

  11. DMSO, Hobby Shops and the FDA: The Diffusion of a Health Policy Dilemma.

    Weinstock, Edward; Davis, Phillip


    Despite being banned by the FDA, DMSO (dimethyl sulfoxide) usage has spread rapidly among arthritic victims and weekend athletes. This study looked at current and past users to learn how they discovered DMSO, their reactions to buying an illegal drug, and possible implications for public health policy. (MT)

  12. Molecular dynamics study of the solvation of an alpha-helical transmembrane peptide by DMSO

    Duarte, A.M.; Mierlo, van C.P.M.; Hemminga, M.A.


    10-ns molecular dynamics study of the solvation of a hydrophobic transmembrane helical peptide in dimethyl sulfoxide (DMSO) is presented. The objective is to analyze how this aprotic polar solvent is able to solvate three groups of amino acid residues (i.e., polar, apolar, and charged) that are loca

  13. Model films of cellulose. I. Method development and initial results

    Gunnars, S.; Wågberg, L.; Cohen Stuart, M.A.


    This report presents a new method for the preparation of thin cellulose films. NMMO (N- methylmorpholine- N-oxide) was used to dissolve cellulose and addition of DMSO (dimethyl sulfoxide) was used to control viscosity of the cellulose solution. A thin layer of the cellulose solution is spin- coated

  14. Human plasma concentrations of herbicidal carbamate molinate extrapolated from the pharmacokinetics established in in vivo experiments with chimeric mice with humanized liver and physiologically based pharmacokinetic modeling.

    Yamashita, Masanao; Suemizu, Hiroshi; Murayama, Norie; Nishiyama, Sayako; Shimizu, Makiko; Yamazaki, Hiroshi


    To predict concentrations in humans of the herbicidal carbamate molinate, used exclusively in rice cultivation, a forward dosimetry approach was carried out using data from lowest-observed-adverse-effect-level doses orally administered to rats, wild type mice, and chimeric mice with humanized liver and from in vitro human and rodent experiments. Human liver microsomes preferentially mediated hydroxylation of molinate, but rat livers additionally produced molinate sulfoxide and an unidentified metabolite. Adjusted animal biomonitoring equivalents for molinate and its primary sulfoxide from animal studies were scaled to human biomonitoring equivalents using known species allometric scaling factors and human metabolic data with a simple physiologically based pharmacokinetic (PBPK) model. The slower disposition of molinate and accumulation of molinate sulfoxide in humans were estimated by modeling after single and multiple doses compared with elimination in rodents. The results from simplified PBPK modeling in combination with chimeric mice with humanized liver suggest that ratios of estimated parameters of molinate sulfoxide exposure in humans to those in rats were three times as many as general safety factor of 10 for species difference in toxicokinetics. Thus, careful regulatory decision is needed when evaluating the human risk resulting from exposure to low doses of molinate and related carbamates based on data obtained from rats.

  15. [Exploitation of the chemistry of magnesium carbenoids and their use in organic synthesis].

    Satoh, Tsuyoshi


    Synthetic organic chemistry is a base of medicinal chemistry and the exploitation of new methods for carbon-carbon bond formation is of most importance in synthetic organic chemistry. Carbenes and carbenoids have long been known to be highly reactive carbon species that show a variety of unique reactivity. However, those reactive species are not fully used in organic synthesis. The reasons are as follows: one is the precursors for the generation of carbenes and carbenoids are quite limited and the other is that the reactivity of the species is too high to control. In order to solve the problem mentioned above, we used alpha-haloalkyl (or alkenyl) aryl sulfoxides as the precursors and used sulfoxide-magnesium exchange reaction for generation of much mild magnesium carbenoids. alpha-Haloalkyl (or alkenyl) aryl sulfoxides are quite easily synthesized in high overall yields. Magnesium carbenoids, cyclopropylmagnesium carbenoids, cyclobutylmagnesium carbenoids, magnesium beta-oxido carbenoids, and magnesium alkylidene carbenoids are generated at low temperature from the corresponding sulfoxides with a Grignard reagent in quantitative yields. They were found to be stable usually at below -60 degrees C for at least 30 min. The each magnesium carbenoids have their own unique reactivities and we could find many unprecedented reactions from these reactive species. Recent results for the developments of new synthetic methods based on the chemistry of magnesium carbenoids are described.

  16. Controlled modification of biomolecules by ultrashort laser pulses in polar liquids

    Gruzdev, Vitaly; Korkin, Dmitry; Mooney, Brian P.


    -photosensitive peptides and proteins in polar liquids under room conditions. The principal modifications included lysine formylation and methionine sulfoxidation both of which occur with nearly 100% yield under atmospheric conditions. That modification occurred only if the laser irradiance exceeded certain threshold...

  17. Development of a sperm cryopreservation protocol for redside dace, Clinostomus elongatus: implications for genome resource banking

    Butts, Ian A.E.; Mokdad, A.; Trippel, E.A.;


    of extirpation.We developed cryopreservation protocols by testing the effects of diluent (buffered sperm motility-inhibiting saline solution [BSMIS]; BSMIS + glycine; sucrose; and Hanks’ balanced salt solution [HBSS]), cryoprotectant (dimethyl sulfoxide [DMSO]; propylene glycol [PG]; N,N-dimethylacetamide [DMA...


    In only one case, that of L. sativum, methanol was used in place of ethanol. In this case, stock ... and dimethyl sulfoxide (DMSO). These were then ... Counts per minute were converted to disintegrations per minute (DPM) by using an external ... 1996) who observed that petroleum ether, chloroform and methanol extracts of.

  19. Construction of the Core of Pseudolaric Acid A and Mechanistic Studies on Intramolecular [4+3] Cycloaddition


    This paper describes the construction of hemiacetal 2, the core of pseudolaric acid A via oxidative cleavage of acetonide 6 or 7 and enolization-hemiacetalization of aldehyde 8. A plausible general mechanism for the intramolecular [4+3] cycloaddition of sulfoxide 4 to adduct 3 is suggested.

  20. Synthesis of an Albendazole Metabolite: Characterization and HPLC Determination

    Mahler, Graciela; Davyt, Danilo; Gordon, Sandra; Incerti, Marcelo; Nunez, Ivana; Pezaroglo, Horacio; Scarone, Laura; Serra, Gloria; Silvera, Mauricio; Manta, Eduardo


    In this laboratory activity, students are introduced to the synthesis of an albendazole metabolite obtained by a sulfide oxidation reaction. Albendazole as well as its metabolite, albendazole sulfoxide, are used as anthelmintic drugs. The oxidation reagent is H[subscript 2]O[subscript 2] in acetic acid. The reaction is environmental friendly,…

  1. Glucose-oxidase based self-destructing polymeric vesicles

    Napoli, A.; Boerakker, M.J.; Tirelli, N.; Nolte, R.J.M.; Sommerdijk, N.A.J.M.; Hubbell, J.A.


    We have designed oxidation-responsive vesicles from synthetic amphiphilic block copolymers ("polymersomes") of ethylene glycol and propylene sulfide. Thioethers in the hydrophobic poly(propylene sulfide) block are converted into the more hydrophilic sulfoxides and sulfones upon exposure to an

  2. Solid-Phase Organic Chemistry: Synthesis of 2β-(HeterocyclylthiomethylPenam Derivatives on Solid Support

    Ernesto G. Mata


    Full Text Available The synthesis of 2β-(heterocyclylthiomethylpenam derivatives on solid support has been developed. Compounds are obtained in good to high yields (based on loading of the original resin. The key step is the solid-phase double rearrangement of the corresponding penicillin sulfoxide.

  3. Dynamics of charged gibbsite platelets in the isotropic phase

    Kleshchanok, D.; Heinen, M.; Nägele, G.; Holmqvist, P.


    We report on depolarized and non-depolarized dynamic light scattering , static light scattering , and steady shear viscosity measurements on interacting charge-stabilized gibbsite platelets suspended in dimethyl sulfoxide (DMSO). The average collective and (long-time) translational self-diffusion co

  4. Development of an analytical methodology for the determination of the antiparasitic drug toltrazuril and its two metabolites in surface water, soil and animal manure

    Olsen, Jesper; Björklund, Erland; Krogh, Kristine A


    ... with an EC 50 of 3.16 mg L ‚àí1 for toltrazuril [9]. Due to toltrazurils frequent usage ... a LC-MS/MS methodology to determine toltrazuril , toltrazuril sulfoxide and toltrazuril sulfone in ... SPE), and in agricultural soil, animal manure and sediment using pressurized liquid extraction ( PLE ). ...

  5. Lipid-soluble cigarette smoking particles induce expression of inflammatory and extracellular-matrix-related genes in rat cerebral arteries

    Vikman, Petter; Xu, Cang-Bao; Edvinsson, Lars


    AIMS: Cigarette smoking is one of the strongest risk factors for stroke. However, the underlying molecular mechanisms that smoke leads to the pathogenesis of stroke are incompletely understood. METHODS: Dimethyl sulfoxide (DMSO)-soluble (lipid-soluble) cigarette smoking particles (DSP) were extra...

  6. Conformational polymorphism of the PrP106-126 peptide in different environments : A molecular dynamics study

    Villa, Alessandra; Mark, AE; Saracino, GAA; Cosentino, U; Pitea, D; Moro, G; Salmona, M


    Extensive molecular dynamic simulations (similar to 240 ns) have been used to investigate the conformational behavior of PrP106-126 prion peptide in four different environments (water, dimethyl sulfoxide, hexane, and trifluoroethanol) and under both neutral and acidic conditions. The conformational

  7. Glucose-oxidase based self-destructing polymeric vesicles

    Napoli, A.; Boerakker, M.J.; Tirelli, N.; Nolte, R.J.M.; Sommerdijk, N.A.J.M.; Hubbell, J.A.


    We have designed oxidation-responsive vesicles from synthetic amphiphilic block copolymers ("polymersomes") of ethylene glycol and propylene sulfide. Thioethers in the hydrophobic poly(propylene sulfide) block are converted into the more hydrophilic sulfoxides and sulfones upon exposure to an oxidat

  8. JPRS Report Science & Technology USSR: Life Sciences


    analysis was conducted on the effects of conventional cryoprotective agents ( glycerol , ethylene glycol, propylene glycol, dimethyl sulfoxide) on...knowledge of the new operations and of the features of the reform being conducted of the management system. These are indispensable conditions for the high

  9. Anticonvulsant, Antimicrobial and Cytotoxic Activities of Berberis ...

    Shahid Rasool1,2*, Farrukh Zia Khan1, Saeed ul Hassan1, Mobasher Ahmed1, ... Results: The extract and its ethyl acetate and n-butanol fractions showed maximum response against .... (dimethyl sulfoxide) solution. .... Figure 1: Anticonvulsant effect of B. calliobotrys extract and fractions against PTZ induced convulsions.

  10. Anthelmintic efficacy of cashew (Anarcadium occidentale L.) on in ...



    Aug 24, 2011 ... I. O. Ademola1,2* and J. N. Eloff1. 1Phytomedicine ... extract was then filtered through Whatman No 1 filter paper using a. Buchner funnel and ... extracted with an equal volume of butanol in a separating funnel to yield the water ... Albendazole was dissolved in dimethyl sulfoxide (0.3% DMSO) and diluted at.

  11. Antimetastatic activity of novel ruthenium (III) pyridine complexes

    Gu, Liwei; Li, Xiaodong; Ran, Qingsen; Kang, Chen; Lee, Canghai; Shen, Jianying


    Ruthenium‐based complexes have emerged as promising anticancer, especially antimetastatic agents. Among them, NAMI ‐A ( trans ‐[Ru( III )Cl 4 ( DMSO )(Im)][ImH], Im = imidazole, DMSO  = dimethyl sulfoxide) was well studied...

  12. Synthesis of an Albendazole Metabolite: Characterization and HPLC Determination

    Mahler, Graciela; Davyt, Danilo; Gordon, Sandra; Incerti, Marcelo; Nunez, Ivana; Pezaroglo, Horacio; Scarone, Laura; Serra, Gloria; Silvera, Mauricio; Manta, Eduardo


    In this laboratory activity, students are introduced to the synthesis of an albendazole metabolite obtained by a sulfide oxidation reaction. Albendazole as well as its metabolite, albendazole sulfoxide, are used as anthelmintic drugs. The oxidation reagent is H[subscript 2]O[subscript 2] in acetic acid. The reaction is environmental friendly,…

  13. Genotyping of the 19-bp insertion/deletion polymorphism in the 5' flank of beta-hydroxylase gene by dissociation analysis of allele-specific PCR products

    Rasmussen, Henrik Berg; Werge, Thomas


    DNA fragments. Mistyping of heterozygote samples due to preferential allele amplification was prevented by use of an optimized concentration of Mg(2+), addition of dimethyl sulfoxide and annealing/extension at an appropriate temperature. Comparison of results achieved by the closed-tube assay...

  14. Determination of Thirteen Plasticizers in Food Plastic Packaging Materials by Capillary Column Gas Chromatography%食品包装材料中13种增塑剂的毛细管气相色谱法测定

    马康; 汤福寿; 何雅娟; 刘菲


    A capillary column gas chromatographic method was developed for the separation and determination of thirteen plasticizers, including dimethyl phthalate acid ester(DMP), diethyl phthalate acid ester( DEP), dipropyl phthalate acid ester( DnPP), diisobutyl phthalate acid ester( DIBP), dibutyl phthalate acid ester( DBP), diamyl phthalate acid ester( DAP), bisphenol A( BIA), di-n-hexyl phthalate acid ester(DHP), butyl benzyl phthalate acid ester(BBP), di-2-ethylhexyl adipate (DEHA), di(2-ethylhexyl) phthalate acid ester(DEHP), dioctyl phthalate acid ester(DOP) and dinonyl phthalate acid ester(DNP) in plastic packaging materials for foodstuff. The analytes were extracted with hexane from samples by Soxhlet extraction technique, then purified by silica solid phase extraction. Three key factors such as rinse solvent, eluting solvent and eluting volume were optimized. Hexane and toluene ( 1: 1, by volume) were used as rinse solvents, 2 mL ethyl acetate was used as eluting solvent. After filtration, the eluate was determined by gas chromatography with flame ionization detector(GC/FID). The calibration curves of thirteen plasticizers were linear in the range of O. 1 - 1 000 mg/L with detection limits of 0. 005 - 0. 030 mg/L. The spiked recoveries ranged from 90% to 116% with relative standard deviations of 2. 2% -4. 9%. The method was successfully applied in the determination of plasticizers in plastic packaging materials for foodstuff.%建立了索氏提取、固相萃取净化浓缩、毛细管气相色谱法测定塑料食品包装材料中13种增塑剂的方法.优化了固相萃取淋洗剂、洗脱剂和洗脱剂体积等参数.样品经正己烷索氏提取后,用硅胶小柱净化浓缩.以正己烷-甲苯为淋洗剂,2 mL乙酸乙酯为洗脱剂.过滤后的洗脱液用气相色谱仪分析.结果显示,13种增塑剂在0.1~1000 mg/L范围内呈良好线性,检出限为0.005~O.030 mg/L.样品的加标回收率为90%~116%,相对标准偏差为2.2%~4.9%.

  15. Kinetically controlled synthesis of Au102(SPh)44 nanoclusters and catalytic application

    Chen, Yongdong; Wang, Jin; Liu, Chao; Li, Zhimin; Li, Gao


    We here explore a kinetically controlled synthetic protocol for preparing solvent-solvable Au102(SPh)44 nanoclusters which are isolated from polydispersed gold nanoclusters by solvent extraction and size exclusion chromatography (SEC). The as-obtained Au102(SPh)44 nanoclusters are determined by matrix-assisted laser desorption ionization (MALDI) and electrospray ionization (ESI) mass spectrometry, in conjunction with UV-vis spectroscopy and thermogravimetric analysis (TGA). However, Au99(SPh)42, instead of Au102(SPh)44, is yielded when the polydispersed gold nanoclusters are etched in the presence of excess thiophenol under thermal conditions (e.g., 80 °C). Interestingly, the Au102(SPh)44 nanoclusters also can convert to Au99(SPh)42 with equivalent thiophenol ligands, evidenced by the analyses of UV-vis and MALDI mass spectrometry. Finally, the TiO2-supported Au102(SPh)44 nanocluster catalyst is investigated in the selective oxidation of sulfides into sulfoxides by the PhIO oxidant and gives rise to high catalytic activity (e.g., 80-99% conversion of R-S-R' sulfides with 96-99% selectivity for R-S(&z.dbd;O)-R' sulfoxides). The Au102(SPh)44/TiO2 catalyst also shows excellent recyclability in the sulfoxidation process.We here explore a kinetically controlled synthetic protocol for preparing solvent-solvable Au102(SPh)44 nanoclusters which are isolated from polydispersed gold nanoclusters by solvent extraction and size exclusion chromatography (SEC). The as-obtained Au102(SPh)44 nanoclusters are determined by matrix-assisted laser desorption ionization (MALDI) and electrospray ionization (ESI) mass spectrometry, in conjunction with UV-vis spectroscopy and thermogravimetric analysis (TGA). However, Au99(SPh)42, instead of Au102(SPh)44, is yielded when the polydispersed gold nanoclusters are etched in the presence of excess thiophenol under thermal conditions (e.g., 80 °C). Interestingly, the Au102(SPh)44 nanoclusters also can convert to Au99(SPh)42 with equivalent

  16. Fenbendazole pharmacokinetics, metabolism, and potentiation in horses.

    McKellar, Q A; Gokbulut, C; Muzandu, K; Benchaoui, H


    The present study was designed to describe the pharmacokinetics and fecal excretion of fenbendazole (FBZ) and fenbendazole sulphoxide (FBZSO) and their metabolites in horses, to investigate the effects which concurrent feeding has on the absorption and pharmacokinetics of FBZ, and to determine the effect of coadministration of the metabolic inhibitor piperonyl-butoxide on the in vivo pharmacokinetics and in vitro liver microsomal metabolism of sulfide and sulfoxide benzimidazoles. The effect of piperonyl-butoxide on the enantiomeric genesis of the sulfoxide moiety was also investigated. Following administration of FBZSO and FBZ, the fenbendazole sulphone metabolite predominated in plasma, and the C(max) and area under the plasma curve (AUC) values for each moiety were larger (P 4:1 to 1:1. It is concluded that in horses efficacy of FBZSO and FBZ could be improved by administration to unfed animals and coadministration with piperonyl-butoxide.

  17. Identification of a Denitrase Activity Against Calmodulin in Activated Macrophages Using High-Field Liquid Chromatography - FTICR Mass Spectrometry

    Smallwood, Heather S.; Lourette, Natacha M.; Boschek, Curt B.; Bigelow, Diana J.; Smith, Richard D.; Pasa-Tolic, Liljiana; Squier, Thomas C.


    We have identified a denitrase activity in macrophages that is upregulated following macrophage activation, which is shown by mass spectrometry to recognize nitrotyrosines in the calcium signaling protein calmodulin (CaM) and convert them to their native tyrosine structure without the formation of any aminotyrosine. Comparable extents of methionine sulfoxide reduction are also observed that are catalyzed by endogenous methionine sulfoxide reductases. Competing with repair processes, oxidized CaM is a substrate for a peptidase activity that results in the selective cleavage of the C-terminus lysine (i.e., Lys148) that is expected to diminish CaM function. Thus, competing repair and peptidase activities define the abundances and functionality of CaM to modulate cellular metabolism in response to oxidative stress, where the presence of the truncated CaM species provides a useful biomarker for the transient appearance of oxidized CaM.

  18. Thioredoxin-dependent Redox Regulation of Cellular Signaling and Stress Response through Reversible Oxidation of Methionines

    Bigelow, Diana J.; Squier, Thomas C.


    Generation of reactive oxygen species (ROS) is a common feature of many forms of stress to which plants are exposed. Successful adaptation to changing environmental conditions requires sensitive sensors of ROS such as protein-bound methionines that are converted to their corresponding methionine sulfoxides, which in turn can influence cellular signaling pathways. Such a signaling protein is calmodulin, which represents an early and central point in calcium signaling pathways important to stress response in plants. We describe recent work elucidating fundamental mechanisms of reversible methionine oxidation within calmodulin, including the sensitivity of individual methionines within plant and animal calmodulin to ROS, the structural and functional consequences of their oxidation, and the interactions of oxidized calmodulin with methionine sulfoxide reductase enzymes.

  19. Sulindac Sulfide, but Not Sulindac Sulfone, Inhibits Colorectal Cancer Growth

    Christopher S. Williams


    Full Text Available Sulindac sulfide, a metabolite of the nonsteroidal antiinflammatory drug (NSAID sulindac sulfoxide, is effective at reducing tumor burden in both familial adenomatous polyposis patients and in animals with colorectal cancer. Another sulindac sulfoxide metabolite, sulindac sulfone, has been reported to have antitumor properties without inhibiting cyclooxygenase activity. Here we report the effect of sulindac sulfone treatment on the growth of colorectal carcinoma cells. We observed that sulindac sulfide or sulfone treatment of HCA-7 cells led to inhibition of prostaglandin E2 production. Both sulindac sulfide and sulfone inhibited HCA-7 and HCT-116 cell growth in vitro. Sulindac sulfone had no effect on the growth of either HCA-7 or HCT-116 xenografts, whereas the sulfide derivative inhibited HCA-7 growth in vivo. Both sulindac sulfide and sulfone inhibited colon carcinoma cell growth and prostaglandin production in vitro, but sulindac sulfone had no effect on the growth of colon cancer cell xenografts in nude mice.

  20. Solvent affects the conformation of virginiamycin M1 (pristinamycin IIA, streptogramin A).

    Dang, Jason; Bergdahl, Mikael; Separovic, Frances; Brownlee, Robert T C; Metzger, Robert P


    The streptogramins are antibiotics which act by binding two different components at separate nearby sites on the bacterial 50S ribosome, inhibiting protein synthesis. The first component, a macrolactone, is common to many of the streptogramin antibiotics and, thus, is referred to by many names including virginiamycin M1(VM1), pristinamycin IIA, ostreogrycin A and streptogramin A. X-Ray crystallographic studies of VM1 bound to ribosomes and to a deactivating enzyme show a different conformation to that of VM1 in chloroform solution. We now report the results of high resolution 2D NMR experiments that show that the conformation of VM1 in dimethyl sulfoxide and methanol differs from both that in chloroform solution and in the bound form. The 3D structure and the 1H NMR and 13C NMR chemical shifts of VM1 in dimethyl sulfoxide and methanol are described.

  1. Preparation and characterization of Co9S8 nanocrystalline and nanorods

    Peng-Fei Yin; Li-Li Sun; You-Lu Gao; Sheng-Yue Wang


    Hexagonal Co9S8 nanocrystal and nanorods were synthesized using cobalt chloride (CoCl2.6H2O), dimethyl sulfoxide (DMSO) and non-aqueous alcohol as the starting materials, and taking dimethyl sulfoxide as both sulfur source and strong infiltrator in nanorods preparation. The Co9S8 samples were characterized by X-ray diffraction (XRD), scanning tunneling microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and laser Raman spectrometer. The results show that the as-prepared Co9S8 nanocrystal with a size of 6 nm take on weak paramagnetism at room temperature. The lengths and diameters of the nanorods were about 4 m and 200 nm, respectively. The reason for the relative lower synthesis temperature of nanorods was discussed and a ‘micro-autoclave reactor’ model was suggested as well.

  2. Biosynthesis and Accumulation of Sulphur Compounds in White Radish During the First Three Days of Sprouting

    Maria Doinița Borș


    Full Text Available  Glucosinolates (GLs and S-methyl cysteine sulfoxide (SMCSO are natural sulphur containing phytochemicals. They are two of the most important bioactive compounds found in brassica vegetables, which are highly regarded for their health-promoting activity. In this study we have analysed the content of GLs and SMCSO in white radish, by an HPLC-MS method, in order to illustrate their biosynthesis and accumulation during the first 72 hours of sprouting. Total GLs content ranged between  54.17 and 126.86 µmol/g DW. There were eight GLs identified, in radish sprouts and around 94 % of them were aliphatic. Obvious differences, during the 72 hours of sprouting, were noticed in glucoraphenin and glucoraphasatin. S-methyl cysteine sulfoxide content ranged between 0.21 and 35.95 µmol/g DW. Our results revealed a negative strong correlation between GLs and SMCSO.


    曲红梅; 白鹏; 周立山; 杨志才


    To evaluate the effect of two liquid phase on the separation of musks mixture, the phase equilibria of musk ketone+musk xylene + dimethyl sulfoxide + heptane system were studied for the first time. The whole and every part of the phase equilibrium for the quaternary system were shown by three-dimensional phase diagrams, the liquid-liquid equilibria, solid-liquid equilibria and solid-liquid-liquid equilibria of the quaternary system were also shown. As a result, the compositions of musks in the equilibrium liquid phases were different from those in the feed, that is, musk ketone was enriched in dimethyl sulfoxide phase while musk xylene was enriched in heptane phase. So these equilibrium liquid phases were useful in separating musk ketone and musk xylene. On the basis of these results, a new process “two liquid phase extractive crystallization” was proposed to separate the eutectics of musk ketone and musk xylene.

  4. Erythroid differentiation in cultured Friend leukemia cells treated with metabolic inhibitors.

    Ebert, P S; Wars, I; Buell, D N


    The induction of erythroid differentiation in the T3-C12 clone of Friend leukemia cells by dimethyl sulfoxide is accompanied by reduction in viral RNA-dependent DNA polymerase activity with increased cellular delta-aminolevulinic acid synthetase activity and hemoglobin synthesis. These cells were treated with a variety of compounds to determine whether other durgs are capable on inducing erythroid differentiation. While several hormones, inhibitors of RNA synthesis, organic solvents, inhibitors of DNA polymerase, sulfhydryl inhibitors, and inducers of delta-aminolevulinic acid synthetase administered singly did not stimulate hemoglobin synthesis like dimethyl sulfoxide, inhibitors of DNA and RNA synthesis such as adriamycin, mitomycin C, and hydroxyurea:mithramycin were synergistic in stimulating erythroid differentiation.

  5. Preliminary studies on the cryopreservation of spermatozoa in the fresh water fish common carp (Cyprinus carpio L.)

    Kuppusamy Umaa Rani; Natesan Munuswamy


    Objective: To investigate the effects of various extenders containing different cryoprotectants on post-thaw viability, motility and scanning electron microscopic study of frozen spermatozoa from carp. Methods:cryopreservation has been achieved using extender and cryoprotectants like dimethylacetamide After screening a variety of cryoprotectants and extenders, a protocol for the 5%-20% at appropriate dilution ratio (1:10). For all experimental tests, the motility and viability percentage of spermatozoa were examined after storage of 5 d at 4 °C. Results: The maximum motility of 75% has been observed with 10% dimethyl sulfoxide. Scanning electron microscopic studies on normal and cryopreserved spermatozoa showed prominent head, middle piece and different segments of flagellum. There were no significant deformities noticed on the surface topography of cryopreserved spermatozoa. Conclusions:Thus the results clearly documented that cryoprotectant 10% dimethyl sulfoxide affords better cryopreservation at 4 °C for the spermatozoa of Cyprinus carpio.

  6. Communication: Contrasting effects of glycerol and DMSO on lipid membrane surface hydration dynamics and forces

    Schrader, Alex M.; Cheng, Chi-Yuan; Israelachvili, Jacob N.; Han, Songi


    Glycerol and dimethyl sulfoxide (DMSO) are commonly used cryoprotectants in cellular systems, but due to the challenges of measuring the properties of surface-bound solvent, fundamental questions remain regarding the concentration, interactions, and conformation of these solutes at lipid membrane surfaces. We measured the surface water diffusivity at gel-phase dipalmitoylphosphatidylcholine (DPPC) bilayer surfaces in aqueous solutions containing ≤7.5 mol. % of DMSO or glycerol using Overhause...

  7. Participation of water in Hin recombinase--DNA recognition.

    Robinson, C.R.; Sligar, S G


    The participation of water molecules in the interaction between the Hin recombinase and its operator DNA has been detected by analysis of the dissociation constant in the presence of varying concentrations of neutral solutes and cosolvents. The dissociation constant as measured by gel mobility shift assays increased as the concentration of dimethyl sulfoxide, glycerol, sucrose, or polyethylene glycol was increased. Osmotic pressure is the only property that correlates with the change in the d...

  8. Preparation of Polyamide Nanocapsules of Aloe vera L. Delivery with In Vivo Studies

    Esmaeili, Akbar; Ebrahimzadeh, Maryam


    Aloe vera is the oldest medicinal plant ever known and the most applied medicinal plant worldwide. The purpose of this study was to prepare polyamide nanocapsules containing A. vera L. by an emulsion diffusion technique with in vivo studies. Diethyletriamine (DETA) was used as the encapsulating polymer with acetone ethyl acetate and dimethyl sulfoxide (DMSO) as the organic solvents and Tween and gelatin in water as the stabilizers. Sebacoyl chloride (SC) monomer, A. vera L. extract, and olive...

  9. Hawaii Energy and Environmental Technologies (HEET) Initiative


    Biomass sources to be investigated will include phototrophic and heterotrophic microalgae , heterotrophic yeast, and oil-seeds. To execute the overall...the extraction of bio-oil from microalgae biomass when dissolved in ionic liquids; 2. Optimization of the direct production of fatty acid methyl... microalgae , had a lipid content of approximately 8-11% (wt %). PCM Yield (wt %)* Dimethyl sulfoxide 6.0 Acetic Acid 5.6 Methanol 7.9 Acetone 9.2

  10. Cryopreservation studies on the marine diatom Navicula subinflata Grun

    Redekar, P.D.; Wagh, A.B.

    , Arbault and Delanoue (1994 ) on Porphyra linearis and Conavate and Lubian (1994 and 1995) on marine microalgae. The present work deals with the cryopreservation of the marine diatom Navicula subinflata and its response to growth after keeping in liquid.... and G. Delanoue 1994. Cryopre- servation of Porphyra linearis conchocelis phase. Cryptogamie. Algol. 15(1) : 65-72. Conavate, J. P. and L. M. Lubian 1994. Tolerance of six marine microalgae to the cryoprotectant dimethyl sulfoxide and Methanol...

  11. Evaluation of anti-freeze viscosity modifier for potential external tank applications

    Lynn, R. O. L.


    Viscosity modifiers and gelling agents were evaluated in combination with ethylene glycol and dimethyl sulfoxide water eutectics. Pectin and agarose are found to gel these eutectics effectively in low concentration, but the anti-freeze protection afforded by these compositions is found to be marginal in simulations of the intended applications. Oxygen vent shutters and vertical metallic surfaces were simulated, with water supplied as a spray, dropwise, and by condensation from the air.

  12. SmI(2)-induced reductive cyclizations for the synthesis of cyclic ethers and applications in natural product synthesis.

    Nakata, Tadashi


    This tutorial review covers SmI(2)-induced reductive cyclizations of beta-alkoxyacrylate, beta-alkoxyvinyl sulfone, and beta-alkoxyvinyl sulfoxide, as methods for efficient construction of cyclic ethers. These cyclizations were developed as tools to aid in the total synthesis of marine polycyclic ethers, whose complex, synthetically challenging structures and potent bioactivities have attracted the attention of numerous synthetic organic chemists. Applications of the methods to total syntheses of various natural products containing cyclic ether are also described.

  13. The in vitro metabolism of phospho-sulindac amide, a novel potential anticancer agent.

    Xie, Gang; Cheng, Ka-Wing; Huang, Liqun; Rigas, Basil


    Phospho-sulindac amide (PSA) is a novel potential anti-cancer and anti-inflammatory agent. Here we report the metabolism of PSA in vitro. PSA was rapidly hydroxylated at its butane-phosphate moiety to form two di-hydroxyl-PSA and four mono-hydroxyl-PSA metabolites in mouse and human liver microsomes. PSA also can be oxidized or reduced at its sulindac moiety to form PSA sulfone and PSA sulfide, respectively. PSA was mono-hydroxylated and cleared more rapidly in mouse liver microsomes than in human liver microsomes. Of eight major human cytochrome P450s (CYPs), CYP3A4 and CYP2D6 exclusively catalyzed the hydroxylation and sulfoxidation reactions of PSA, respectively. We also examined the metabolism of PSA by three major human flavin monooxygenases (FMOs). FMO1, FMO3 and FMO5 were all capable of catalyzing the sulfoxidation (but not hydroxylation) of PSA, with FMO1 being by far the most active isoform. PSA was predominantly sulfoxidized in human kidney microsomes because FMO1 is the dominant isoform in human kidney. PSA (versus sulindac) is a preferred substrate of both CYPs and FMOs, likely because of its greater lipophilicity and masked-COOH group. Ketoconazole (a CYP3A4 inhibitor) and alkaline pH strongly inhibited the hydroxylation of PSA, but moderately suppressed its sulfoxidation in liver microsomes. Together, our results establish the metabolic pathways of PSA, identify the major enzymes mediating its biotransformations and reveal significant inter-species and inter-tissue differences in its metabolism.

  14. Cysteine Conjugate β-Lyase Activity of Rat Erythrocytes and Formation of β-Lyase-Derived Globin Monoadducts and Cross-Links after in Vitro Exposure of Erythrocytes to S-(1,2-Dichlorovinyl)-L-cysteine

    Barshteyn, Nella; Elfarra, Adnan A.


    S-(1,2-Dichlorovinyl)-L-cysteine (DCVC), a mutagenic and nephrotoxic metabolite of trichloroethylene can be bioactivated to reactive metabolites, S-(1,2-dichlorovinyl)-L-cysteine sulfoxide (DCVCS) or chlorothioketene and/or 2-chlorothionoacetyl chloride, by cysteine conjugate S-oxidase (S-oxidase) and cysteine conjugate β-lyase (β-lyase), respectively. Previously, we characterized reactivity of DCVCS with Hb upon incubation of erythrocytes with DCVCS and provided evidence for formation of dis...

  15. Recommended methods for purification of solvents and tests for impurities

    Coetzee, J F


    Recommended Methods for Purification of Solvents and Tests for Impurities is a compilation of recommended procedures for purification of solvents and tests for solvent impurities. Ten solvents are covered: acetonitrile, sulfolane, propylene carbonate, dimethyl sulfoxide, dimethylformamide, hexamethylphosphoramide, pyridine, ethylenediamine, N-methylacetamide, and N-methylpropionamide. This book is comprised of 12 chapters and opens with an introduction to general aspects of impurity effects. The rationale for the selection of solvent is explained, and the relative reactivities of solutes in di

  16. Preparation and characterization of insulin-surfactant complexes for loading into lipid-based drug delivery systems

    Li, Ping; Nielsen, Hanne Mørck; Fano, Mathias


    as complexing surfactant and dimethyl sulfoxide (DMSO) as solvent. Significant change in secondary structure of insulin freeze dried from DMSO was observed using Fourier transform infrared spectroscopy. Changes were quantitatively smaller in the presence of surfactants, demonstrating both a stabilizing effect...... of insulin after freeze-drying from DMSO, constituting a potential generic issue with this technique for protein processing. In the specific case of insulin, the changes were found to be reversible, explaining the success of this strategy in previous studies....

  17. Bis(3-acetyl-6-methyl-2-oxo-2H-pyran-4-olatobis(dimethyl sulfoxidenickel(II

    Amel Djedouani


    Full Text Available In the title compound, [Ni(C8H7O42{(CH32SO}2], the NiII atom is located on a crystallographic centre of symmetry and has a distorted octahedral coordination geometry of type MO6. The bidentate dehydroacetic acid (DHA ligands occupy the equatorial plane of the complex in a trans configuration, and the dimethyl sulfoxide (DMSO ligands are weakly coordinated through their O atoms in the axial positions.

  18. Theoretical investigation of the electronic structure of a substituted nickel phthalocyanine

    Kaur, Prabhjot, E-mail:; Sachdeva, Ritika [Department of Physics, Panjab University Chandigarh-160014, Chandigarh (India); Singh, Sukhwinder [Department of Physics, Govt. College for Girls, Ludhiana-141008, Ludhiana (India)


    The optimized geometry and electronic structure of an organic compound nickel phthalocyanine tetrasulfonic acid tetra sodium salt have been investigated using density functional theory. We have also optimized the structure of nickel phthalocyanine tetrasulfonic acid tetra sodium salt in dimethyl sulfoxide to study effects of solvent on the electronic structure and transitions. Experimentally, the electronic transitions have been studied using UV-VIS spectroscopic technique. It is observed that the electronic transitions obtained from the theoretical studies generally agree with the experiment.

  19. Laser spectroscopy and dynamics of transient species

    Clouthier, D. J.


    Work was done on sub-Doppler spectroscopy of thioformaldehyde, electronic spectrum of FS2 radical, FTIR spectra of the transient molecule formyl chloride (HCOCl and DCOCl), and high-resolution FTIR spectra of the nu(sub 9) (CH2 wag) and nu(sub 5) (CSO symm. stretch) bands of sulfine (H2CSO), a transient species formed in pyrolysis of dimethyl sulfoxide and oxidation of thioformaldehyde.

  20. New optically active poly(amide-imide)s based on N,N '-(pyromellitoyl)-bis-L-amino acid and methylene diphenyl-4,4 '-diisocyanate

    Tian, Xiaoyu; Yao, Jinshui; Zhang, Xian


    Five new optically active poly(amide-imide)s were synthesized through the direct polycondensation reaction between chiral N,N-(pyromellitoyl)-bis-L-amino acids and methylene diphenyl-4,4-diisocyanate in a medium consisting of N-methyl-2-pyrrolidone (NMP) and xylene. The resulted polymers were ful......,N-dimethyl formamide, dimethyl sulfoxide (DMSO), NMP, sulfuric acid, and para-methyl phenol. Same specific rotations of these polymers in these different solvents were obtained....

  1. Influence Of Zwitterions on Properties and Morphology of Ionomers: Implications for Electro-Active Applications


    acrylate and n-butyl acrylate ( nBA ) based sulfobetaine-containing polymers.13,14 They demonstrated that the incorporation of zwitterionic functionalities...propanesulfonate (SBMA). Through copolymerizing the two charge-containing monomers with nBA , a series of zwitterionomers and their corresponding...graciously provided by Raschig GmbH. n-Butyl acrylate ( nBA ), dimethyl sulfoxide (DMSO, 99.9+%) and hydroquinone (99%) were purchased from Alfa Aesar. 2

  2. Multiple antioxidant proteins protect Chlorobaculum tepidum against oxygen and reactive oxygen species

    Li, Hui; Jubelirer, Sara; Garcia Costas, Amaya M


    The genome of the green sulfur bacterium Chlorobaculum (Cba.) tepidum, a strictly anaerobic photolithoautotroph, is predicted to encode more than ten genes whose products are potentially involved in protection from reactive oxygen species and an oxidative stress response. The encoded proteins...... include cytochrome bd quinol oxidase, NADH oxidase, rubredoxin oxygen oxidoreductase, several thiol peroxidases, alkyl hydroperoxide reductase, superoxide dismutase, methionine sulfoxide reductase, and rubrerythrin. To test the physiological functions of some of these proteins, ten genes were...

  3. Mixed function oxidases and insecticide resistance in medically important insects


    MFOs are a large diverse superfamily of enzymes found in all insect tissues. They are involved in the metabolism of xenobiotics (e.g. drugs, pesticides and plant toxins) and endogenous compounds (e.g. ecdysteroids and juvenile hormones). They are also involved in bioactivation of phosphorothioate compounds such as organophosphorus insecticides. They have very diverse activities like hydroxylation, epoxidation, N-, O-or S-dealkylation, deamination, sulfoxidation, desulfuration and oxidative de...

  4. Facile method to synthesize oleic acid-capped magnetite nanoparticles


    We described a simple one-step process for the synthesis of oleic acid-capped magnetite nanoparticles using the dimethyl sulfoxide(DMSO) to oxidize the precursor Fe~(2+) at 140℃.By adjusting the alkalinity of the reaction system,magnetite nanoparticles with two sizes of 4 and 7 nm could be easily achieved.And the magnetite nanoparticles coated by oleate were well-monodispersed in organic solvent.

  5. Feasibility of cryopreservation of zebrafish (Danio rerio) primordial germ cells by whole embryo freezing

    HIGAKI, SHOGO; Mochizuki, Kentaro; Baba, Hiroko; Akashi, Yuichiro; Yamaha, Etsuro; Katagiri, Seiji; Takahashi, Yoshiyuki


    We investigated the feasibility of cryopreservation of zebrafish (Danio rerio) blastomeres and primordial germ cells (PGCs) by rapid freezing of dechorionated whole embryos at the blastula, gastrula and segmentation stages. Initially we examined the glass-forming properties and embryo toxicities of 5 cryoprotectants: methanol (MeOH), ethylene glycol (EG), dimethyl sulfoxide (DMSO), propylene glycol (PG), and 1,3-butylene glycol (1,3-BG). Embryos at the blastula and gastrula stages had high se...

  6. XAFS study of bioactive Cu(II) complexes of 7-hydroxycoumarin derivatives in organic solvents

    Klepka, M. T.; Wolska, A.; Drzewiecka-Antonik, A.; Rejmak, P.; Hatada, K.; Aquilanti, G.


    We characterize the structure of two Cu(II) complexes of 7-hydroxycoumarins in organic solvents. The solvents are, dimethyl sulfoxide and dimethylformamide. X-ray absorption spectroscopy together with density functional theory calculations are employed to identify the structural changes induced by the two solvents in comparison to the solid form of complexes. We show that the structure of the Cu(II) complexes is modified depending on the solvent and we propose the geometry of the complexes molecule.



    An inter-laboratory validation study was conducted to evaluate the potential of 4 chemicals to cause irritation with utilizing the Skin^2 Dermal Model ZK1100 kit developed by Advanced Tissue Sciences, Inc. (formerly Marrow-Tech, Inc., La Jolla, California, USA). The chemicals tested were sodium dodecyl sulfate (SDS), 1-n-hexadecyl-pyridinium chloride monohydrate (CC), ethanol (EtOH), and dimethyl sulfoxide (DMSO). Eleven Japanese insititutions participated in this validation research to evalu...


    Tsoutsi, Charoula; Konstantinou, Ioannis; Hela, Dimitra


    Abstract In this study, the occurrence of organophosphorus pesticides (OPs) and metabolite residues was investigated in 167 samples of Greek virgin olive oil during a two-year (2004–2005) sampling campaign. A total of 30.5% of samples contained detectable residues while only one sample contained dimethoate residues higher than the maximum residue limits. Among the seven detected OPs, fenthion and fenthion sulfoxide residues were detected in 10.8% and 14.4% of the samples...

  9. Simulation of HD Reactivity 1. Competition Rates of Oxidation of HD with Simulants


    5171-5174 (1978). 2. Davis, F.A., Awad, S.B., Jenkins, R.H., Jr., Billmers , R.L., and Jenkins, L.A., "Chemistry of Sulfenic Acids, 5. A Novel...thiapyran, Synthesis of Thiete Sulfoxides," J. Org. Chem. Vol. 48, pp 3071-3074 (1983). 3. Davis, F.A., Billmers , J.M., Gosciniak, D.J., Towson, J.C

  10. 烷氧基钨配合物的合成及β-H消去反应%Synthesis and β-Hydrogen Elimination of Alkoxo Complexes of Tungsten

    任建国; 王自为; 张智敏; 刘滇生; 湊盟; 伊藤卓


    Four alkoxo tungsten complexes[Cp2W(PMe3)OR]+OTs-(R=Me,Et,n-Pr,i-Pr) and monohydrido tungsten complex [Cp2W(H)(PMe3)]+OTs- were synthesized and characterized by IR, 1H NMR and elemental analysis. The β-elimination of these complexes in dimethyl sulfoxide solvent yields monohydrido tungsten complex [Cp2W(H)(PMe3)]+OTs- and a ketone or aldehyde.

  11. Metal Coordination Polymers as Potential High-Energy Lithographic Resists


    resists,I ~ ~ ~ 1-&obalt polymers--- - dfiroiuinpIrms (CotiueC-positive6 resjits ,-beta- diketones 19 At8tTRACT (Cniu nreverse ifnecessary and odentify by...have synthesized several cobalt(III) coordi- nation polymers, one of which was briefly described earlier (5,6). The general synthesis for three... diketones from ad- jacent units in the polymer chains. The corresponding sulfone polymer can be synthesized from the oxidation of the sulfoxide

  12. Regioselective organocatalysis: a theoretical prediction of the selective rate acceleration of the SN2 reaction between an acetate ion and primary alkyl chlorides in DMSO solution.

    Pliego, Josefredo R


    High level ab initio calculations, including the solvent effect through a continuum solvation model, predict that 1,4-benzenedimethanol is able to catalyse the S(N)2 reaction between an acetate ion and primary alkyl chlorides in dimethyl sulfoxide solution. The catalysis takes place through two selective hydrogen bonds to the transition state. However, for secondary alkyl chlorides the catalysis is not effective due to steric repulsion and desolvation. This effect induces regioselective control of S(N)2 esterification reactions.

  13. 溴化钾催化硫化物、硝酸铵和 SiO2-OSO3H 固体酸的氧化反应%Chemoselective Oxidation of Sulfides with Ammonium Nitrate and Silica Sulfuric Acid Catalyzed by KBr



    A convenient and selective catalytic method for the sulfoxidation of aliphatic and aromatic sulfides by treatment of NH4NO3, silica sulfuric acid, wet SiO2 (50% w/w) and a catalytic amount of KBr in CH2Cl2 at room temperature was developed. Many sulfides can be selectively oxidized at room temperature in good to excellent yields. The reaction proceeds without over-oxidation to sulfones under mild conditions.

  14. Sulfur Groups Improve the Performance of Triazole- and Triazolium-Based Interaction Units in Anion Binding.

    Álvarez-Pérez, Mónica; Velado, Marina; García-Puentes, Diego; Sáez, Elena; Vicent, Cristina; Fernández de la Pradilla, Roberto; Viso, Alma; de la Torre, María C; Sierra, Miguel A


    An NMR comparative study of 1,2,3-triazole and triazolium anion recognition units containing sulfoxide, sulfone, and sulfoximine groups at C4 unveils an enhancement in binding ability up to ≈1 kcal/mol in acetone-d6 correlated with a theoretical increase of H5 acidity. DFT calculations provide insight into binding modes in line with experimental data for these receptors.

  15. Effects of arsenic poisoning on neuronal cell apoptosis and mRNA and protein expression of calpain 1,calpain 2,and cdk5/p25



    Objective To study the effect of arsenic on neuronal cell apoptosis and the mRNA and protein expression of calpain 1,calpain 2,and cyclin-dependent kinases 5(cdk5)/p25 and to provide a scientific basis for the research on neurotoxic mechanism of arsenic trioxide(As2O3).Methods Primary cultured rat neurons were divided into untreated control group,dimethyl sulfoxide

  16. Conjugate addition of diethyl 1-fluoro-1-phenylsulfonylmethanephosphonate to α,β-unsaturated compounds.

    Opekar, Stanislav; Pohl, Radek; Eigner, Václav; Beier, Petr


    Diethyl 1-fluoro-1-phenylsulfonylmethanephosphonate (1) in the presence of cesium carbonate undergoes efficient 1,4-addition to Michael acceptors having terminal double bonds such as α,β-unsaturated ketones, esters, sulfones, sulfoxides, and phosphonates to yield the corresponding adducts in good to excellent yields. In the presence of sodium hydride, 1 reacts with α,β-enones to provide γ-fluoro-γ-phenylsulfonylenol phosphates arising from 1,4-addition followed by phosphonate to phosphate rearrangement.

  17. β-thymosins and interstitial lung disease: study of a scleroderma cohort with a one-year follow-up

    Messana Irene


    Full Text Available Abstract Background β-thymosins play roles in cytoskeleton rearrangement, angiogenesis, fibrosis and reparative process, thus suggesting a possible involvement in the pathogenesis of systemic sclerosis. The aim of the study was to investigate the presence of thymosins β4, β4 sulfoxide, and β10 in bronchoalveolar lavage fluid of scleroderma patients with interstitial lung disease and the relation of these factors with pulmonary functional and radiological parameters. Methods β-thymosins concentrations were determined by Reverse Phase-High Performance Liquid Chromatography-Electrospray-Mass Spectrometry in the bronchoalveolar lavage fluid of 46 scleroderma patients with lung involvement and of 15 controls. Results Thymosin β4, β4 sulfoxide, and β10 were detectable in bronchoalveolar lavage fluid of patients and controls. Thymosin β4 levels were significantly higher in scleroderma patients than in controls. In addition, analyzing the progression of scleroderma lung disease at one-year follow-up, we have found that higher thymosin β4 levels seem to have a protective role against lung tissue damage. Thymosin β4 sulfoxide levels were higher in the smokers and in the scleroderma patients with alveolitis. Conclusions We describe for the first time β-thymosins in bronchoalveolar lavage fluid and their possible involvement in the pathogenesis of scleroderma lung disease. Thymosin β4 seems to have a protective role against lung tissue damage, while its oxidation product mirrors an alveolar inflammatory status.

  18. Transformation of cefazolin during chlorination process: Products, mechanism and genotoxicity assessment

    Li, Liping, E-mail:; Wei, Dongbin, E-mail:; Wei, Guohua, E-mail:; Du, Yuguo, E-mail:


    Highlights: • Base-catalyzed electrophilic substitution occurred in cefazolin chlorination. • Oxidation of thioether in cefazolin was found in chlorination process. • The pH conditions impacted on the occurrence of reaction types. • Genotoxicity had an elevation after chlorination of cefazolin. • Reaction pathways of cefazolin chlorination were replayed in surface water matrix. -- Abstract: Large quantities of cephalosporins have entered into aquatic environment in recent years, posing potential adverse effect to human health and ecological safety. In this study, cefazolin, one of widely used cephalosporins, was targeted to explore its transformation behaviors in chlorination disinfection process. With the help of ultra high performance liquid chromatography and high resolution mass spectroscopy, one chlorinated product and four oxidation products were detected in cefazolin chlorination system. The corresponding transformation pathways of cefazolin were proposed. Two kinds of reactions occurred in chlorination system, one was oxidation of thioether-sulfur to sulfoxide and di-sulfoxide, and the other was base-catalyzed electrophilic substitution of alpha-H of amide by chlorine atom. The pH value determined the occurrence of reaction types, and increasing chlorine dose promoted transformation of cefazolin. More importantly, genotoxicity in SOS/umu assay had an elevation after chlorination, which might be attributed to the formation of chlorinated product and sulfoxide during chlorination process.

  19. β-thymosins and interstitial lung disease: study of a scleroderma cohort with a one-year follow-up


    Background β-thymosins play roles in cytoskeleton rearrangement, angiogenesis, fibrosis and reparative process, thus suggesting a possible involvement in the pathogenesis of systemic sclerosis. The aim of the study was to investigate the presence of thymosins β4, β4 sulfoxide, and β10 in bronchoalveolar lavage fluid of scleroderma patients with interstitial lung disease and the relation of these factors with pulmonary functional and radiological parameters. Methods β-thymosins concentrations were determined by Reverse Phase-High Performance Liquid Chromatography-Electrospray-Mass Spectrometry in the bronchoalveolar lavage fluid of 46 scleroderma patients with lung involvement and of 15 controls. Results Thymosin β4, β4 sulfoxide, and β10 were detectable in bronchoalveolar lavage fluid of patients and controls. Thymosin β4 levels were significantly higher in scleroderma patients than in controls. In addition, analyzing the progression of scleroderma lung disease at one-year follow-up, we have found that higher thymosin β4 levels seem to have a protective role against lung tissue damage. Thymosin β4 sulfoxide levels were higher in the smokers and in the scleroderma patients with alveolitis. Conclusions We describe for the first time β-thymosins in bronchoalveolar lavage fluid and their possible involvement in the pathogenesis of scleroderma lung disease. Thymosin β4 seems to have a protective role against lung tissue damage, while its oxidation product mirrors an alveolar inflammatory status. PMID:21314931

  20. Crystal structure of 16-ferrocenylmethyl-3β-hydroxyestra-1,3,5(10-trien-17-one: a potential chemotherapeutic drug

    José A. Carmona-Negrón


    Full Text Available A new ferrocene complex, 16-ferrocenylmethyl-3β-hydroxyestra-1,3,5(10-trien-17-one dimethyl sulfoxide monosolvate, [Fe(C5H5(C24H27O2]·C2H6OS, has been synthesized and structurally characterized by single-crystal X-ray diffraction techniques. The molecule crystallizes in the space group P21 with one molecule of dimethyl sulfoxide. A hydrogen bond links the phenol group and the dimethyl sulfoxide O atom, with an O...O distance of 2.655 (5 Å. The ferrocene group is positioned in the β face of the estrone moiety, with an O—C—C—C torsion angle of 44.1 (5°, and the carbonyl bond length of the hormone moiety is 1.216 (5 Å, typical of a C=O double bond. The average Fe—C bond length of the substituted Cp ring [Fe—C(Cp*] is similar to that of the unsubstituted one [Fe—C(Cp], i.e. 2.048 (3 versus 2.040 (12 Å. The structure of the complex is compared with those of estrone and ethoxymethylestrone.

  1. Cryobiology of coral fragments.

    Hagedorn, Mary; Farrell, Ann; Carter, Virginia L


    Around the world, coral reefs are dying due to human influences, and saving habitat alone may not stop this destruction. This investigation focused on the biological processes that will provide the first steps in understanding the cryobiology of whole coral fragments. Coral fragments are a partnership of coral tissue and endosymbiotic algae, Symbiodinium sp., commonly called zooxanthellae. These data reflected their separate sensitivities to chilling and a cryoprotectant (dimethyl sulfoxide) for the coral Pocillopora damicornis, as measured by tissue loss and Pulse Amplitude Modulated fluorometry 3weeks post-treatment. Five cryoprotectant treatments maintained the viability of the coral tissue and zooxanthellae at control values (1M dimethyl sulfoxide at 1.0, 1.5 and 2.0h exposures, and 1.5M dimethyl sulfoxide at 1.0 and 1.5h exposures, P>0.05, ANOVA), whereas 2M concentrations did not (Pcoral tissue, but not in the zooxanthellae. During the winter when the fragments were chilled, the coral tissue remained relatively intact (∼25% loss) post-treatment, but the zooxanthellae numbers in the tissue declined after 5min of chilling (Pcoral tissue (∼75% loss) and zooxanthellae numbers declined in response to chilling alone (Pcoral against tissue loss after 45min of cryoprotectant exposure (P>0.05, ANOVA), but it did not protect against the loss of zooxanthellae (Pcoral fragment complex and future cryopreservation protocols must be guided by their greater sensitivity. Copyright © 2012 Elsevier Inc. All rights reserved.

  2. Structure and phase transitions of the multilamellar DMPC membranes in presence of the DMSO and DESO

    Gorshkova, Yu E.; Ivankov, O. I.


    The structure and phase transitions of the prepared and formed spontaneously multilamellar vesicles (MLVs) of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) in dimethyl sulfoxide (DMSO) and diethyl sulfoxide (DESO) were investigated using small angle neutron scattering (SANS). The both polar aprotic solvents increase the temperature of the main phase transition (Tm ). The pre-transition does not observed at sulfoxides mole fraction X = 0.2. The transition of the MLVs DMPC in the presence DMSO from gel to liquid-crystalline phase occurs at lower temperature. The method of the MLVs preparation has directly effects on the temperature of the main phase transition and its structure. The value of Tm is higher with ∼ 4.6 ºC in case of the spontaneous forming MLVs from extruded ULVs. The thickness of the solvent layer for prepared MLVs is less by 4.0 Å in gel phase and by 5.6 Å in liquid-crystalline phase than the thickness of the solvent layer for spontaneously formed MLVs.

  3. Mechanisms of Methylene Blue Degradation in Three-dimensionally Integrated Micro-solution Plasma

    Nomura, Ayano; Hayashi, Yui; Tanaka, Kenji; Shirafuji, Tatsuru; Goto, Motonobu


    Plasma in aqueous solution has attracted much attention because they are expected to have possibilities to solve water-related environmental issues. In such application-oriented researches, degradation of methylene blue (MB) or other organic dyes has been widely used for investigating the effects of the plasma treatment on the water with organic contaminants. However, there are few reports on the detailed analysis of the products after the plasma treatment of MB aqueous solution for understanding mechanisms of the degradation processes. We have hence analyzed our degradation products using matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. We have performed the MB degradation in three-dimensionally integrated micro-solution plasma, which has shown 16-fold higher performance in MB degradation than conventional solution plasma. The results of MALDI-TOF mass spectrometry have indicated the formation of sulfoxides in the first stage of the degradation. Then, the methyl groups on the sulfoxides are partially oxidized. The sulfoxides are separated to form two benzene derivatives after that. Finally, weak functional groups are removed from the benzene derivatives.

  4. Methionine oxidation contributes to bacterial killing by the myeloperoxidase system of neutrophils.

    Rosen, Henry; Klebanoff, Seymour J; Wang, Yi; Brot, Nathan; Heinecke, Jay W; Fu, Xiaoyun


    Reactive oxygen intermediates generated by neutrophils kill bacteria and are implicated in inflammatory tissue injury, but precise molecular targets are undefined. We demonstrate that neutrophils use myeloperoxidase (MPO) to convert methionine residues of ingested Escherichia coli to methionine sulfoxide in high yield. Neutrophils deficient in individual components of the MPO system (MPO, H(2)O(2), chloride) exhibited impaired bactericidal activity and impaired capacity to oxidize methionine. HOCl, the principal physiologic product of the MPO system, is a highly efficient oxidant for methionine, and its microbicidal effects were found to correspond linearly with oxidation of methionine residues in bacterial cytosolic and inner membrane proteins. In contrast, outer envelope proteins were initially oxidized without associated microbicidal effect. Disruption of bacterial methionine sulfoxide repair systems rendered E. coli more susceptible to killing by HOCl, whereas over-expression of a repair enzyme, methionine sulfoxide reductase A, rendered them resistant, suggesting a direct role for methionine oxidation in bactericidal activity. Prominent among oxidized bacterial proteins were those engaged in synthesis and translocation of peptides to the cell envelope, an essential physiological function. Moreover, HOCl impaired protein translocation early in the course of bacterial killing. Together, our findings indicate that MPO-mediated methionine oxidation contributes to bacterial killing by neutrophils. The findings further suggest that protein translocation to the cell envelope is one important pathway targeted for damage.

  5. Peroxidase-catalyzed S-oxygenation: Mechanism of oxygen transfer for lactoperoxidase

    Doerge, D.R.; Cooray, N.M. (Univ. of Hawaii, Honolulu (United States)); Brewster, M.E. (Pharmatec Inc., Alachua, FL (United States))


    The mechanism of organosulfur oxygenation by peroxidases (lactoperoxidase (LPX), chloroperoxidase, thyroid peroxidase, and horseradish peroxidase) and hydrogen peroxide was investigated by use of para-substituted thiobenzamides and thioanisoles. The rate constants for thiobenzamide oxygenation by LPX/H{sub 2}O{sub 2} were found to correlate with calculated vertical ionization potentials, suggesting rate-limiting single-electron transfer between LPX compound I and the organosulfur substrate. The incorporation of oxygen from {sup 18}O-labeled hydrogen peroxide, water, and molecular oxygen into sulfoxides during peroxidase-catalyzed S-oxygenation reactions was determined by LC- and GC-MS. All peroxidases tested catalyzed essentially quantitative oxygen transfer from {sup 18}O-labeled hydrogen peroxide into thiobenzamide S-oxide, suggesting that oxygen rebound from the oxoferryl heme is tightly coupled with the initial electron transfer in the active site. Experiments using H{sub 2}{sup 18}O{sub 2}, and H{sub 2}{sup 18}O showed the LPX catalyzed approximately 85,22, and 0% {sup 18}O-incorporation into thioanisole sulfoxide oxygen, respectively. These results are consistent with an active site controlled mechanism in which the protein radical form of LPX compound I is an intermediate in LPX-mediated sulfoxidation reactions.

  6. A dielectric barrier discharge terminally inactivates RNase A by oxidizing sulfur-containing amino acids and breaking structural disulfide bonds

    Lackmann, J.-W.; Baldus, S.; Steinborn, E.; Edengeiser, E.; Kogelheide, F.; Langklotz, S.; Schneider, S.; Leichert, L. I. O.; Benedikt, J.; Awakowicz, P.; Bandow, J. E.


    RNases are among the most stable proteins in nature. They even refold spontaneously after heat inactivation, regaining full activity. Due to their stability and universal presence, they often pose a problem when experimenting with RNA. We investigated the capabilities of nonthermal atmospheric-pressure plasmas to inactivate RNase A and studied the inactivation mechanism on a molecular level. While prolonged heating above 90 °C is required for heat inactivating RNase A, direct plasma treatment with a dielectric barrier discharge (DBD) source caused permanent inactivation within minutes. Circular dichroism spectroscopy showed that DBD-treated RNase A unfolds rapidly. Raman spectroscopy indicated methionine modifications and formation of sulfonic acid. A mass spectrometry-based analysis of the protein modifications that occur during plasma treatment over time revealed that methionine sulfoxide formation coincides with protein inactivation. Chemical reduction of methionine sulfoxides partially restored RNase A activity confirming that sulfoxidation is causal and sufficient for RNase A inactivation. Continued plasma exposure led to over-oxidation of structural disulfide bonds. Using antibodies, disulfide bond over-oxidation was shown to be a general protein inactivation mechanism of the DBD. The antibody’s heavy and light chains linked by disulfide bonds dissociated after plasma exposure. Based on their ability to inactivate proteins by oxidation of sulfur-containing amino acids and over-oxidation of disulfide bonds, DBD devices present a viable option for inactivating undesired or hazardous proteins on heat or solvent-sensitive surfaces.

  7. Effect of Turkish propolis extracts on proteome of prostate cancer cell line

    Barlak Yaşam


    Full Text Available Abstract Background Propolis is a natural, resinous hive product that has several pharmacological activities. Its composition varies depending on the vegetation, climate, season and environmental conditions of the area from where it was collected. Surface enhanced laser desorption ionization time of flight mass spectrometry (SELDI-TOF MS is a proteomic approach which has been used in cancer proteomics studies. Prostate cancer is one of the most commonly diagnosed cancers in men. It has shown that nutritional supplements rich in polyphenolic compounds such as propolis play a significant role in prostate cancer chemoprevention. The aim of this study is to evaluate if protein expression profile in PC-3 prostate cancer cell lines could be differentiated when incubated with dimethyl sulfoxide and water extracts of Turkish propolis. Results The antioxidant potentials of dimethyl sulfoxide and water extracts of propolis were found in correlation with the amount of total phenolic compounds of them. Dimethyl sulfoxide and water extracts of propolis of 20 μg/mL reduced the cell viability to 24.5% and 17.7%, respectively. Statistically significant discriminatory peaks between control PC-3 cells and dimethyl sulfoxide extract of propolis-treated PC-3 cells were found to be the proteomic features at m/z 5143, 8703, 12661, 20184 and 32794, detected by CM10 ProteinChip, and the peak at m/z 3772, detected by Q10 ProteinChip. Between control PC-3 cells and water extract of propolis-treated PC-3 cells, statistically significant discriminatory peaks were found to be the proteomic features at m/z 15846, 16052 and 24658, detected by CM10 ProteinChip and the peaks at m/z 10348, 10899 and 11603, detected by Q10 ProteinChip. Conclusions It was concluded that dimethyl sulfoxide and water extracts of Turkish propolis may have anti-proliferative activity through differentiating protein expression profile in PC-3 prostate cancer cell lines along with their antioxidant

  8. Garlic γ-glutamyl transpeptidases that catalyze deglutamylation of biosynthetic intermediate of alliin

    Naoko eYoshimoto


    Full Text Available S-Alk(enyl-L-cysteine sulfoxides are pharmaceutically important secondary metabolites produced by plants that belong to the genus Allium. Biosynthesis of S-alk(enyl-L-cysteine sulfoxides is initiated by S-alk(enylation of glutathione, which is followed by the removal of glycyl and γ-glutamyl groups and S-oxygenation. However, most of the enzymes involved in the biosynthesis of S-alk(enyl-L-cysteine sulfoxides in Allium plants have not been identified. In this study, we identified three genes, AsGGT1, AsGGT2, and AsGGT3, from garlic (Allium sativum that encode γ-glutamyl transpeptidases catalyzing the removal of the γ-glutamyl moiety from a putative biosynthetic intermediate of S-allyl-L-cysteine sulfoxide (alliin. The recombinant proteins of AsGGT1, AsGGT2, and AsGGT3 exhibited considerable deglutamylation activity toward a putative alliin biosynthetic intermediate, γ-glutamyl-S-allyl-L-cysteine, whereas these proteins showed very low deglutamylation activity toward another possible alliin biosynthetic intermediate, γ-glutamyl-S-allyl-L-cysteine sulfoxide. The deglutamylation activities of AsGGT1, AsGGT2, and AsGGT3 toward γ-glutamyl-S-allyl-L-cysteine were elevated in the presence of the dipeptide glycylglycine as a γ-glutamyl acceptor substrate, although these proteins can act as hydrolases in the absence of a proper acceptor substrate, except water. The apparent Km values of AsGGT1, AsGGT2, and AsGGT3 for γ-glutamyl-S-allyl-L-cysteine were 86 μM, 1.1 mM, and 9.4 mM, respectively. Subcellular distribution of GFP-fusion proteins transiently expressed in onion cells suggested that AsGGT2 localizes in the vacuole, whereas AsGGT1 and AsGGT3 possess no apparent transit peptide for localization to intracellular organelles. The different kinetic properties and subcellular localizations of AsGGT1, AsGGT2, and AsGGT3 suggest that these three GGTs may contribute differently to the biosynthesis of alliin in garlic.

  9. Cyamemazine metabolites: effects on human cardiac ion channels in-vitro and on the QTc interval in guinea pigs.

    Crumb, William; Benyamina, Amine; Arbus, Christophe; Thomas, George P; Garay, Ricardo P; Hameg, Ahcène


    Monodesmethyl cyamemazine and cyamemazine sulfoxide, the two main metabolites of the antipsychotic and anxiolytic phenothiazine cyamemazine, were investigated for their effects on the human ether-à-go-go related gene (hERG) channel expressed in HEK 293 cells and on native I(Na), I(Ca), I(to), I(sus) or I(K1) of human atrial myocytes. Additionally, cyamemazine metabolites were compared with terfenadine for their effects on the QT interval in anaesthetized guinea pigs. Monodesmethyl cyamemazine and cyamemazine sulfoxide reduced hERG current amplitude, with IC50 values of 0.70 and 1.53 microM, respectively. By contrast, at a concentration of 1 microM, cyamemazine metabolites failed to significantly affect I(Na), I(to), I(sus) or I(K1) current amplitudes. Cyamemazine sulfoxide had no effect on I(Ca) at 1 microM, while at this concentration, monodesmethyl cyamemazine only slightly (17%), albeit significantly, inhibited I(Ca) current. Finally, cyamemazine metabolites (5 mg kg(-1) i v.) were unable to significantly prolong QTc values in the guinea pig. Conversely, terfenadine (5 mg kg(-1) i.v.) significantly increased QTc values. In conclusion, cyamemazine metabolite concentrations required to inhibit hERG current substantially exceed those necessary to achieve therapeutic activity of the parent compound in humans. Moreover, cyamemazine metabolites, in contrast to terfenadine, do not delay cardiac repolarization in the anaesthetized guinea pig. These non-clinical findings explain the excellent cardiac safety records of cyamemazine during its 30 years of extensive therapeutic use.

  10. Visualizing dengue virus through Alexa Fluor labeling.

    Zhang, Summer; Tan, Hwee Cheng; Ooi, Eng Eong


    The early events in the interaction between virus and cell can have profound influence on the outcome of infection. Determining the factors that influence this interaction could lead to improved understanding of disease pathogenesis and thus influence vaccine or therapeutic design. Hence, the development of methods to probe this interaction would be useful. Recent advancements in fluorophores development and imaging technology can be exploited to improve our current knowledge on dengue pathogenesis and thus pave the way to reduce the millions of dengue infections occurring annually. The enveloped dengue virus has an external scaffold consisting of 90 envelope glycoprotein (E) dimers protecting the nucleocapsid shell, which contains a single positive strand RNA genome. The identical protein subunits on the virus surface can thus be labeled with an amine reactive dye and visualized through immunofluorescent microscopy. Here, we present a simple method of labeling of dengue virus with Alexa Fluor succinimidyl ester dye dissolved directly in a sodium bicarbonate buffer that yielded highly viable virus after labeling. There is no standardized procedure for the labeling of live virus and existing manufacturer's protocol for protein labeling usually requires the reconstitution of dye in dimethyl sulfoxide. The presence of dimethyl sulfoxide, even in minute quantities, can block productive infection of virus and also induce cell cytotoxicity. The exclusion of the use of dimethyl sulfoxide in this protocol thus reduced this possibility. Alexa Fluor dyes have superior photostability and are less pH-sensitive than the common dyes, such as fluorescein and rhodamine, making them ideal for studies on cellular uptake and endosomal transport of the virus. The conjugation of Alexa Fluor dye did not affect the recognition of labeled dengue virus by virus-specific antibody and its putative receptors in host cells. This method could have useful applications in virological studies.

  11. Photoacoustic calorimetry studies of CO photo-dissociation from chloramine-T modified horse heart cytochrome-c.

    Word, Tarah A; Larsen, Randy W


    Treatment of horse heart Cytochrome-c (Cc) with N-chloro-4-toluosulfonamide (Chloramine-t, CT) results in the oxidation of methionine (Met) residues to the corresponding sulfoxide including the distal heme ligand, Met80. The resulting Fe-sulfoxide coordination is sufficiently labile in the ferrous form to be displaced by gaseous ligands, including CO. Photolysis of the CO-CT-Cc complex provides an opportunity to examine ligand binding dynamics that are associated with a relatively rigid distal heme pocket. In this work, photoacoustic calorimetry (PAC) was utilized to obtain the kinetics as well as enthalpy and molar volume changes subsequent to CO photo-dissociation from CO-CT-Cc. Previous photolysis studies of CO-CT-Cc have led to a proposed model for ligand recombination in which the Met80-sulfoxide and CO recombine with the heme on relatively slow timescales (50 μs and ∼500 μs, respectively). The PAC data presented here reveals two additional kinetic phases with lifetimes of <20 ns and 534 ± 75 ns. The fast phase (<20 ns) is associated with an ΔH of 44 ± 5 kcal mol(-1) and ΔV of -0.5 ± 0.5 mL mol(-1), whereas the slower phase (534 ns) is associated with a small ΔH of 2 ± 3 kcal mol(-1) and ΔV of 1 ± 0.5 mL mol(-1). Copyright © 2016 Elsevier Inc. All rights reserved.

  12. Efficacy of a metalloproteinase inhibitor in spinal cord injured dogs.

    Levine, Jonathan M; Cohen, Noah D; Heller, Michael; Fajt, Virginia R; Levine, Gwendolyn J; Kerwin, Sharon C; Trivedi, Alpa A; Fandel, Thomas M; Werb, Zena; Modestino, Augusta; Noble-Haeusslein, Linda J


    Matrix metalloproteinase-9 is elevated within the acutely injured murine spinal cord and blockade of this early proteolytic activity with GM6001, a broad-spectrum matrix metalloproteinase inhibitor, results in improved recovery after spinal cord injury. As matrix metalloproteinase-9 is likewise acutely elevated in dogs with naturally occurring spinal cord injuries, we evaluated efficacy of GM6001 solubilized in dimethyl sulfoxide in this second species. Safety and pharmacokinetic studies were conducted in naïve dogs. After confirming safety, subsequent pharmacokinetic analyses demonstrated that a 100 mg/kg subcutaneous dose of GM6001 resulted in plasma concentrations that peaked shortly after administration and were sustained for at least 4 days at levels that produced robust in vitro inhibition of matrix metalloproteinase-9. A randomized, blinded, placebo-controlled study was then conducted to assess efficacy of GM6001 given within 48 hours of spinal cord injury. Dogs were enrolled in 3 groups: GM6001 dissolved in dimethyl sulfoxide (n = 35), dimethyl sulfoxide (n = 37), or saline (n = 41). Matrix metalloproteinase activity was increased in the serum of injured dogs and GM6001 reduced this serum protease activity compared to the other two groups. To assess recovery, dogs were a priori stratified into a severely injured group and a mild-to-moderate injured group, using a Modified Frankel Scale. The Texas Spinal Cord Injury Score was then used to assess long-term motor/sensory function. In dogs with severe spinal cord injuries, those treated with saline had a mean motor score of 2 (95% CI 0-4.0) that was significantly (Pinjured cord.

  13. Multiple dose pharmacokinetics of quetiapine and some of its metabolites in Chinese suffering from schizophrenia

    Kun-yan LI; Xin LI; Ze-neng CHENG; Wen-xing PENG; Bi-kui ZHANG; Huan-de LI


    AIM: To study the multiple dose pharmacokinetics of quetiapine and its sulfoxide-, 7-hydroxy-, 7-hydroxy-Ndealkyl-metabolites in Chinese suffering from schizophrenia. METHODS: Twenty-one patients (11 females and 10males) were given quetiapine twice daily to control the symptoms. After the dose reached 200 mg twice daily,blood were sampled to study the pharmacokinetics. The plasma concentrations of quetiapine and its metabolites were assayed by HPLC-MS. RESULTS: The main pharmacokinetic parameters of quetiapine, 7-hydroxy-N-dealkylquetiapine, quetiapine sulfoxide, and 7-hydroxy-quetiapine were as follows: tmax were 2.0 (0.3-5.0), 4.0 (1.5-6.0),3.0 (0.5-5.0), and 3.0 (0.5-5.0) h respectively; t1/2 were (7±3), (9.4±2.7), (7±3), and (8±5) h, respectively; CSSmaxwere (678±325), (19±5), (451±216), and (58±22) μg/L, respectively; CSSmin were (51±68), (3.3±1.6), (35±36), and (5±4) μg/L, respectively; CSSav were (295±144), (13±4), (209±71), and (28±9) μg/L, respectively; AUCSS0-12 were (0.103±0.028) h-1, respectively; CL/F and V/F of quetiapine were (67±25) L.h-1 and (672±394) L, respectively.The plasma concentrations for the four compounds reached a steady state within 48 h at the dose of 200 mg initiation. These parameters were not statistically different between genders. CONCLUSIONS: Quetiapine was absorbed quickly, distributed widely, and metabolized mainly to be quetiapine sulfoxide. The elimination speeds of quetiapine and its three metabolites were similar. Gender had no effect on the pharmacokinetics of quetiapine and its metabolites. The clinical dosage regime caused no drug accumulation.

  14. Cryptosporidiosis among patients with acquired immunodeficiency syndrome (AIDS in the county of São Paulo, Brazil

    Rosa Maria Donini Souza Dias


    Full Text Available Stool samples of 157 patients with AIDS, living in the county of São Paulo, were submitted to several techniques in the search for Cryptosporidium sp.. Among the various techniques tested for slide preparation (direct smear, spontaneous sedimentation method, and formol-ether concentration, the latter, formol-ether concentration, offered the best results, clearly outdoing all the others. Nineteen samples out of 157 prepared by this technique, after dyeing by the Kinyoun method or by carbol fuchsin dimethyl sulfoxide, were found to be positive for Cryptosporidium sp..

  15. NMR Chemical Shift Ranges of Urine Metabolites in Various Organic Solvents

    Benjamin Görling


    Full Text Available Signal stability is essential for reliable multivariate data analysis. Urine samples show strong variance in signal positions due to inter patient differences. Here we study the exchange of the solvent of a defined urine matrix and how it affects signal and integral stability of the urinary metabolites by NMR spectroscopy. The exchange solvents were methanol, acetonitrile, dimethyl sulfoxide, chloroform, acetone, dichloromethane, and dimethyl formamide. Some of these solvents showed promising results with a single batch of urine. To evaluate further differences between urine samples, various acid, base, and salt solutions were added in a defined way mimicking to some extent inter human differences. Corresponding chemical shift changes were monitored.

  16. Design, Synthesis and Recognition Properties of a New Acetate Ion Receptor Based on Shiff-base Derivative

    QIAO Yan-hong; LIN Hai; LIN Hua-kuan


    A simple colorimetric acetate ion receptor based on 3-methoxysalicylaldehyde-4′-nitrophenyl-hydrazone was synthesized in an ethanol solution through one step,and characterized by 1H NMR and elemental analyses.Its anion-binding ability was examined by UV-Vis absorption spectroscopy in DMSO(dimethyl sulfoxide).The result shows that the compound has a high affinity for and a high selectivity toward acetate ions,and also an advantage of 'naked-eye' recognition of color changing from yellow to purple.

  17. Effect of cryoprotectants for maintaining drug permeability barriers in porcine buccal mucosa

    Marxen, Eva; Axelsen, Mary Carlos; Pedersen, Anne Marie Lynge;


    if permeability barriers for small molecules (nicotine and diazepam) were maintained after freezing porcine buccal mucosa with cryoprotectants to -80°C. Combinations of dimethyl sulfoxide, bovine serum albumin, glycerol and sucrose were used as cryoprotectants. The permeability of nicotine and diazepam across...... tissue. Freezing with or without cryoprotectants did not significantly affect the flux of diazepam compared to fresh tissue. Only minor histological changes were seen in frozen/thawed porcine buccal mucosa compared to fresh tissue. In conclusion, permeability barriers for nicotine and diazepam were...

  18. Synthesis of Fullerene-Acrylamide Copolymer Nanoball and Its Lubrication Properties

    JIANG,Gui-Chang(江贵长); GUAN,Wen-Chao(官文超); ZHENG,Qi-Xin(郑启新)


    A novel fullerene-acrylamide copolymer was synthesized via radical polymerization. It is soluble in polar solvents such as water, dimethyl sulfoxide etc. The product was characterized by FTIR, UV-Vis and GPC. TEM analysis shows that the average particle diameter is about 46 nm. Four-ball tests show that the addition of a certain concentration of the fullerene copolymer to base stock (2 wt% triethanolamine and 0.5 wt% OPZ aqueous solution) can effectively raise the load-carrying capacity (PB value) and the antiwear ability. SEM analysis shows that the addition results in reducing diameter of wear scar and decreasing wear.

  19. Molecular biological enhancement of coal biodesulfurization. [Thiobacillus cuprinus

    Litchfield, J.H.; Zupancic, T.J.; Baker, B.; Palmer, D.T.; Fry, I.J.; Tranuero, C.G.; Wyza, R.E.; Schweitzer, A.; Conkle, H.N. (Battelle, Columbus, OH (United States)); Chakravanty, L.; Tuovinen, O.H. (Ohio State Univ., Columbus, OH (United States))


    The objective of this project is to produce one or more microorganisms capable of removing the organic and inorganic sulfur in coal. The original specific technical objectives of the project were to: clone and characterize the genes encoding the enzymes of the 4S'' pathway (sulfoxide/sulfone/sulfonate/sulfate) for release of organic sulfur from coal; return multiple copies of genes to the original host to enhance the biodesulfurization activity of that organism; transfer this pathway into a fast-growing chemolithotropic bacterium; conduct a batch-mode optimization/analysis of scale-up variables.

  20. Molecular biological enhancement of coal biodesulfurization. Ninth quarterly technical progress report

    Litchfield, J.H.; Zupancic, T.J.; Baker, B.; Palmer, D.T.; Fry, I.J.; Tranuero, C.G.; Wyza, R.E.; Schweitzer, A.; Conkle, H.N. [Battelle, Columbus, OH (United States); Chakravanty, L.; Tuovinen, O.H. [Ohio State Univ., Columbus, OH (United States)


    The objective of this project is to produce one or more microorganisms capable of removing the organic and inorganic sulfur in coal. The original specific technical objectives of the project were to: clone and characterize the genes encoding the enzymes of the ``4S`` pathway (sulfoxide/sulfone/sulfonate/sulfate) for release of organic sulfur from coal; return multiple copies of genes to the original host to enhance the biodesulfurization activity of that organism; transfer this pathway into a fast-growing chemolithotropic bacterium; conduct a batch-mode optimization/analysis of scale-up variables.

  1. Isolation and cryopreservation of human peripheral blood monocytes.

    Tsvetkov, T; Nickolov, C; Buckureshtliev, A; Mincheff, M; Tsoney, L; Terziev, R; Popov, D


    A modification of the Freundlich and Avdalovic method (J. Immunol. Methods 62, 31 (1983] is reported. Buffy coats, separated and pooled together, are used for isolation of monocytes (70% yield, 100% purity). Cell density of working suspension is increased up to 0.65 X 10(9) cells/75 cm2 surface by multiplication of the active fibronectin sites. For the purpose, cryoprecipitate is used instead of plasma for coating the glass-gelatin surface. Monocytes, isolated by that procedure, could be successfully cryopreserved with dimethyl sulfoxide cryoprotective solution.

  2. Effect of solvent on luminescence properties of re-dispersible LaF3∶Ln3+ (Ln3+=Eu3+,Dy3+,Sm3+ and Tb3+) nanoparticles

    Ganngam Phaomei; W.Rameshwor Singh


    LaF3∶Ln3+ (Eu3+,Dy3+,Sm3+ and Tb3+) nanoparticles were prepared in different solvents such as water,EG (ethylene glycol),DMSO (dimethyl sulfoxide) and their mixed solvents at a relatively low temperature of 150 ℃ by simple chemical route.All the prepared samples showed hexagonal phase and exhibited spherical morphology.The highest luminescence intensity was observed for the samples prepared in EG than the samples prepared in other solvents.However,the sample prepared in water showed anomalously higher luminescence intensity than that of the sample prepared in DMSO.

  3. Quenched Hydrogen Exchange NMR of Amyloid Fibrils.

    Alexandrescu, Andrei T


    Amyloid fibrils are associated with a number of human diseases. These aggregatively misfolded intermolecular β-sheet assemblies constitute some of the most challenging targets in structural biology because to their complexity, size, and insolubility. Here, protocols and controls are described for experiments designed to study hydrogen-bonding in amyloid fibrils indirectly, by transferring information about amide proton occupancy in the fibrils to the dimethyl sulfoxide-denatured state. Since the denatured state is amenable to solution NMR spectroscopy, the method can provide residue-level-resolution data on hydrogen exchange for the monomers that make up the fibrils.

  4. Normal and polar-organic-phase high-performance liquid chromatographic enantioresolution of omeprazole, rabeprazole, lansoprazole and pantoprazole using monochloro-methylated cellulose-based chiral stationary phase and determination of dexrabeprazole.

    Dixit, Shuchi; Dubey, Rituraj; Bhushan, Ravi


    Enantioresolution of four anti-ulcer drugs (chiral sulfoxides), namely, omeprazole, rabeprazole, lansoprazole and pantoprazole, was carried out by high-performance liquid chromatography using a polysaccharide-based chiral stationary phase consisting of monochloromethylated cellulose (Lux cellulose-2) under normal and polar-organic-phase conditions with ultraviolet detection at 285 nm. The method was validated for linearity, accuracy, precision, robustness and limit of detection. The optimized enantioresolution method was compared for both the elution modes. The optimized method was further utilized to check the enantiomeric purity of dexrabeprazole.

  5. In vitro cell tests of pancreatic malignant tumor cells by photothermotherapy based on DMSO porous silicon colloids.

    Hong, Chanseok; Lee, Chongmu


    Dimethyl sulfoxide porous silicon (DMSO-PSi) colloid in which DMSO was used as a surfactant suitable for inhibiting the agglomeration of PSi nanoparticles was prepared for use in cancer photothermotherapy. The photothermal effect of the DMSO-PSi colloid was found to be high enough to destroy cancer cells (T = ∼52 °C). The mean particle size of the PSi nanoparticles in the DMSO-PSi colloid was 67 nm, which is low enough to flow through blood vessels without causing a blockage. The DMSO-PSi colloid in combination with an NIR laser resulted in a cell viability of 5.70%, which is a sufficiently high cytotoxic effect.

  6. Continuous-flow thermolysis for the preparation of vinylglycine derivatives.

    Lamborelle, Nicolas; Simon, Justine F; Luxen, André; Monbaliu, Jean-Christophe M


    Syn sulfoxide elimination was carried out under continuous-flow conditions in a mesofluidic thermolysis reactor. The design of the reactor enabled accurate control of reaction time and conditions, affording a convenient scale-independent procedure for the production of N,C-protected vinylglycine derivatives. Thermolysis at 270 °C under 1000 psi of pressure in superheated toluene enabled typical daily outputs ranging from 11 to 46 g per day with excellent selectivities and ee (>97%). The various competitive reaction pathways were studied and rationalized according to a computational study.

  7. Upregulation of contractile endothelin type B receptors by lipid-soluble cigarette smoking particles in rat cerebral arteries via activation of MAPK

    Sandhu, Hardip; Xu, Cang Bao; Edvinsson, Lars


    Cigarette smoke exposure increases the risk of stroke. However, the underlying molecular mechanisms are poorly understood. Endothelin system plays key roles in the pathogenesis of stroke. The present study was designed to examine if lipid-soluble (dimethyl sulfoxide-soluble) cigarette smoke...... or water-soluble cigarette smoke particles to the organ culture. The increased upregulation of contractile ET(B) receptors by DSP was abrogated by U0126, SP600125, actinomycin D, and cycloheximide, suggesting that the underlying molecular mechanisms involved in this process include activation of MEK...

  8. Lipid-soluble cigarette smoking particles induce expression of inflammatory and extracellular-matrix-related genes in rat cerebral arteries

    Vikman, Petter; Xu, Cang-Bao; Edvinsson, Lars


    AIMS: Cigarette smoking is one of the strongest risk factors for stroke. However, the underlying molecular mechanisms that smoke leads to the pathogenesis of stroke are incompletely understood. METHODS: Dimethyl sulfoxide (DMSO)-soluble (lipid-soluble) cigarette smoking particles (DSP) were...... extracted from cigarette smoke (0.8 mg nicotine per cigarette; Marlboro). Rat cerebral arteries were isolated and organ cultured in the presence of DSP (0.2 microl/ml, equivalent to the plasma level in smokers) for 24 h. The expression of matrix metalloproteinase 9 and 13 (MMP9 and MMP13), angiotensin...

  9. Cigarette smoke extract promotes human vascular smooth muscle cell proliferation and survival through ERK1/2- and NF-κB-dependent pathways

    Chen, Qing-Wen; Edvinsson, Lars; Xu, Cang-Bao


    Tobacco use is one of the major risk factors of cardiovascular disease. The underlying molecular mechanisms that link cigarette smoke to cardiovascular disease remain unclear. The present study was designed to examine the effects of dimethyl sulfoxide (DMSO)-soluble smoke particles (DSPs) on human...... and necrosis were found in serum-starved HASMCs. DSPs decreased cell death and increased B-cell leukemia/lymphoma 2 expression. Blocking phosphorylation of ERK1/2 or NF-κB attenuated DSP-induced cell death inhibition. Cigarette smoke particles stimulate HASMC proliferation and inhibit cell death...

  10. NMR Chemical Shift Ranges of Urine Metabolites in Various Organic Solvents

    Görling, Benjamin; Bräse, Stefan; Luy, Burkhard


    Signal stability is essential for reliable multivariate data analysis. Urine samples show strong variance in signal positions due to inter patient differences. Here we study the exchange of the solvent of a defined urine matrix and how it affects signal and integral stability of the urinary metabolites by NMR spectroscopy. The exchange solvents were methanol, acetonitrile, dimethyl sulfoxide, chloroform, acetone, dichloromethane, and dimethyl formamide. Some of these solvents showed promising results with a single batch of urine. To evaluate further differences between urine samples, various acid, base, and salt solutions were added in a defined way mimicking to some extent inter human differences. Corresponding chemical shift changes were monitored. PMID:27598217

  11. Endogenous activation of adenosine A(1) receptors accelerates ischemic suppression of spontaneous electrocortical activity

    Ilie, Andrei; Ciocan, Dragos; Zagrean, Ana-Maria


    Cerebral ischemia induces a rapid suppression of spontaneous brain rhythms prior to major alterations in ionic homeostasis. It was found in vitro during ischemia that the rapidly formed adenosine, resulting from the intracellular breakdown of ATP, may inhibit synaptic transmission via the A(1...... with either 1.25 mg/kg DPCPX dissolved in 2 ml/kg dimethyl sulfoxide (DMSO) or the same volume of DMSO alone, 15 min before the third ischemic episode. Time to electrocortical suppression was estimated based on the decay of the root mean square of two-channel electrocorticographic recordings. During the first...

  12. A novel cysteine desulfurase influencing organosulfur compounds in Lentinula edodes

    Ying Liu; Xiao-Yu Lei; Lian-Fu Chen; Yin-Bing Bian; Hong Yang; Ibrahim, Salam A.; Wen Huang


    Organosulfur compounds are the basis for the unique aroma of Lentinula edodes, and cysteine sulfoxide lyase (C-S lyase) is the key enzyme in this trait. The enzyme from Alliium sativum has been crystallized and well-characterized; however, there have been no reports of the characterization of fungi C-S lyase at the molecular level. We identified a L. edodes C-S lyase (Lecsl), cloned a gene of Csl encoded Lecsl and then combined modeling, simulations, and experiments to understand the molecula...

  13. Removal of uranium(VI) from solution by fungal biomass and fungal wall-related biopolymers

    Galun, M. (Tel-Aviv Univ., Israel); Keller, P.; Malki, D.; Feldstein, H.; Galun, E.; Siegel, S.M.; Siegel, B.Z.


    Penicillium digitatum mycelium can accumulate uranium from aqueous solutions of uranyl chloride. Azide present during the uptake tests does not inhibit the process. Killing the fungal biomass in boiling water or by treatment with alcohols, dimethyl sulfoxide, or potassium hydroxide increases the uptake capability to about 10,000 parts per million (dry weight). Formaldehyde killing does not enhance the uranium uptake. The inference that wall-binding sites were involved led to the testing of uranium uptake by chitin, cellulose, and cellulose derivatives in microcolumns. All were active, especially chitin.

  14. Pooled safety analysis of diclofenac sodium topical solution 1.5% (w/w in the treatment of osteoarthritis in patients aged 75 years or older

    Roth SH


    Full Text Available Sanford H Roth1, Philip Fuller21Arizona Research and Education, Phoenix, AZ, 2Medical Affairs, Mallinckrodt Inc, Hazelwood, MOBackground: This study aimed to determine the safety of diclofenac sodium topical solution 1.5% (w/w in 45.5% dimethyl sulfoxide (TDiclo for the treatment of knee or hand osteoarthritis in persons aged 75 years or older.Methods: A pooled analysis of safety data from seven multicenter, randomized, blinded, Phase III clinical trials (4–12 weeks' duration of TDiclo was conducted. The analysis focused on a subset of patients (n = 280 aged 75 years or older with a primary diagnosis of osteoarthritis of the knee (six trials or hand (one trial. Patients received one of three topical treatments: TDiclo (n = 138; placebo (2.33% or 4.55% dimethyl sulfoxide, n = 39; or control (45.5% dimethyl sulfoxide, n = 103. Treatment groups were compared using Chi-square analysis, Fisher's Exact test, or analysis of variance.Results: The most common adverse events involved the skin or subcutaneous tissue, primarily at the application site. The incidence of dry skin was higher in the TDiclo (36.2%; P < 0.0001 and dimethyl sulfoxide control (18.4%; P = 0.0142 groups than in the placebo group (2.6%; the incidence of other skin or subcutaneous tissue adverse events was similar between the groups. Relatively few patients (<18% experienced gastrointestinal adverse events, and group differences were not detected. In the TDiclo group, constipation (3.6%, diarrhea (3.6%, and nausea (3.6% were the most common gastrointestinal adverse events. Cardiovascular and renal/urinary adverse events were rare, and group differences were not detected. There was one case (0.7% each of hypertension, spider veins, and vasodilation in the TDiclo group. Changes from baseline to the final visit in blood pressure and hepatic/renal enzyme levels were also similar between the groups.Conclusion: TDiclo appears to be well tolerated for the treatment of osteoarthritis in

  15. Molecular biological enhancement of coal desulfurization. Eleventh quarterly technical progress report

    Litchfield, J.H.; Zupancic, T.J.; Kittle, J.D. Jr.; Baker, B.; Palmer, D.T.; Traunero, C.G.; Wyza, R.E.; Schweitzer, A.; Conkle, H.N. [Battelle, Columbus, OH (United States); Chakravarty, L.; Tuovinen, O.H. [Ohio State Univ., Columbus, OH (United States)


    The objective of this project is to produce one or more microorganisms capable of removing the organic and inorganic sulfur in coal. The original specific technical objectives of the project were to: clone and characterize the genes encoding the enzymes of the ``4S`` pathway (sulfoxide/sulfone/sulfonate/sulfate) for release of organic sulfur from coal; return multiple copies of genes to the original host to enhance the biodesulfurization activity of the organism; transfer this pathway into a fast-growing chemolithotrophic bacterium; conduct a batch-mode optimization/analysis of scale-up variables.

  16. Molecular biological enhancement of coal biodesulfurization. Tenth quarterly technical progress report, [September--December 1991

    Litchfield, J.H.; Zupancic, T.J.; Kittle, J.D.; Baker, B.; Palmer, D.T.; Fry, I.J.; Traunero, C.G.; Wyza, R.E.; Schweitzer, A.; Conkle, H.N. [Battelle, Columbus, OH (United States); Chakravanty, L.; Tuovinen, O.H. [Ohio State Univ., Columbus, OH (United States)


    The objective of this project is to produce one or more microorganisms capable of removing the organic and inorganic sulfur in coal. The specific technical objectives of the project are to: clone and characterize the genes encoding the enzymes of the ``4S`` pathway (sulfoxide/sulfone/sulfonate/sulfate) for release of organic sulfur from coal; return multiple copies of genes to the original host to enhance the biodesulfurization activity of that organism; transfer this pathway into a fast-growing chemolithotrophic bacterium; and conduct a batch-mode optimization/analysis of scale-up variables.

  17. Molecular biological enhancement of coal desulfurization. [Thiobacillus cuprinus

    Litchfield, J.H.; Zupancic, T.J.; Kittle, J.D. Jr.; Baker, B.; Palmer, D.T.; Traunero, C.G.; Wyza, R.E.; Schweitzer, A.; Conkle, H.N. (Battelle, Columbus, OH (United States)); Chakravarty, L.; Tuovinen, O.H. (Ohio State Univ., Columbus, OH (United States))


    The objective of this project is to produce one or more microorganisms capable of removing the organic and inorganic sulfur in coal. The original specific technical objectives of the project were to: clone and characterize the genes encoding the enzymes of the 4S'' pathway (sulfoxide/sulfone/sulfonate/sulfate) for release of organic sulfur from coal; return multiple copies of genes to the original host to enhance the biodesulfurization activity of the organism; transfer this pathway into a fast-growing chemolithotrophic bacterium; conduct a batch-mode optimization/analysis of scale-up variables.

  18. Molecular biological enhancement of coal biodesulfurization

    Litchfield, J.H.; Zupancic, T.J.; Kittle, J.D.; Baker, B.; Palmer, D.T.; Fry, I.J.; Traunero, C.G.; Wyza, R.E.; Schweitzer, A.; Conkle, H.N. (Battelle, Columbus, OH (United States)); Chakravanty, L.; Tuovinen, O.H. (Ohio State Univ., Columbus, OH (United States))


    The objective of this project is to produce one or more microorganisms capable of removing the organic and inorganic sulfur in coal. The specific technical objectives of the project are to: clone and characterize the genes encoding the enzymes of the 4S'' pathway (sulfoxide/sulfone/sulfonate/sulfate) for release of organic sulfur from coal; return multiple copies of genes to the original host to enhance the biodesulfurization activity of that organism; transfer this pathway into a fast-growing chemolithotrophic bacterium; and conduct a batch-mode optimization/analysis of scale-up variables.

  19. Miscellaneous hydrocarbon solvents.

    Bebarta, Vikhyat; DeWitt, Christopher


    The solvents discussed in this article are common solvents not categorized as halogenated, aromatic, or botanical. The solvents discussed are categorized into two groups: hydrocarbon mixtures and single agents. The hydrocarbon mixtures discussed are Stoddard solvent, naphtha, and kerosene. The remaining solvents described are n-hexane, methyl n-butyl ketone, dimethylformamide, dimethyl sulfoxide, and butyl mercaptans. Effects common to this group of agents and their unique effects are characterized. Treatment of exposures and toxic effects of these solvents is described, and physiochemical properties and occupational exposure levels are listed.

  20. Dissolution Behavior of Cellulose in IL + DMSO Solvent: Effect of Alkyl Length in Imidazolium Cation on Cellulose Dissolution

    Airong Xu; Lili Cao; Bingjun Wang; Junying Ma


    Four cellulose solvents including [C2mim][CH3COO] + DMSO, [C4mim][CH3COO] + DMSO, [C6mim][CH3COO] + DMSO, and [C8mim][CH3COO] + DMSO were prepared by adding dimethyl sulfoxide DMSO in 1-ethyl-3-methylimidazolium acetate [C2mim][CH3COO], 1-butyl-3-methylimidazolium acetate [C4mim][CH3COO], 1-hexyl-3-methylimidazolium acetate [C6mim][CH3COO], and 1-octyl-3-methylimidazolium acetate [C8mim][CH3COO], respectively. The solubilities of cellulose in these solvents were determined at 25°C. The effect...