Sample records for CATECOL (catechol)
from WorldWideScience.org

Sample records 1 - 12 shown.



1

Estudio Electroquímico del Ácido 3,4-Dihidroxifenilacético (DOPAC) Adsorbido sobre Oro/ Electrochemical Study of 3,4-Dihydroxyphenylacetic Acid (DOPAC) Adsorbed on Gold

Esquenoni, Sylvia M; Von Mengershausen, Alicia E; Sustersic, María G
2007-01-01

Resumen en español El objetivo de este estudio es conocer el comportamiento del ácido 3,4 dihidroxifenilacético (DOPAC) como adsorbato y como reactivo electroquímico adsorbido sobre oro. Las características de la reacción redox del anillo catecol permite estudiar esta sustancia adsorbida a circuito abierto. El procedimiento consiste en las etapas de adsorción, enjuague con el electrolito y barridos de voltametría cíclica para determinar la cantidad de sustancia adsorbida y el compor (mas) tamiento electroquímico de la misma. Se trabajó con dos celdas, una de adsorción y otra electroquímica, termostatizadas a 25°C. La adsorción del DOPAC es débil, consolidándose el enlace con el tiempo para formar una ligadura tipo σ. Se determina un área por molécula de 47 Ų, similar a la obtenida para la dopamina Resumen en inglés The objective of this study was to obtain knowledge on the behavior of acid 3,4 dihydroxyphenylacetic (DOPAC) as an adsorbate and electrochemical reagent adsorbed on gold. The redox reaction characteristic of the catechol ring allows the study of the substance adsorption under open circuit conditions. The step of the procedure include adsorption, rinsing with electrolyte, and making cyclic voltammetric scan to determine the amount of adsorbed substance and its electrochem (mas) ical behavior. For this, two cells were employed, one for adsorption, and the other electrochemical, both were thermostatted at 25°C. The DOPAC adsorption is weak. The adsorption bound is strengthening with the time forming a s bound. The area per molecule of 47 Ų , very near of that of the dopamine is obtained

Scientific Electronic Library Online (Spanish)

2

Caracterización de Polifenoloxidasa Extraída de Pera (cv. Packam´s Triumph) y Manzana (cv. Red Delicious)/ Characterization of Polyphenyloxidase Extracted from Pears (cv. Packam´s Triumph) and Apples (cv . Red Delicious)

Gasull, Estela; Becerra, Daniela
2006-01-01

Resumen en español Se estudiaron las características de polifenoloxidasa (PFO) extraída de peras Packam´s Triumph y manzanas Red Delicious. El pH óptimo y la temperatura óptima fueron 6,5 y 25°C para pera, 7 y 30°C para manzana, utilizando 50 mM de catecol en buffer fosfato como sustrato. Los valores obtenidos para K M fueron 13,24 mM (pera) y 232,80 mM (manzana), mientras que los valores obtenidos para Vmax fueron 1590 U/mL E (pera) y 5464 U/mL E (manzana), utilizando 50 mM de catec (mas) ol como sustrato. En este estudio se probaron tres inhibidores del PFO, resultando ser el más efectivo el ácido ascórbico. Estudios cinéticos demostraron que la inactivación térmica de PFO sigue una cinética de primer orden. La entalpía de activación (H##) y la entropía de activación (S##) para la inactivación térmica de PFO (pera) fueron 15309 J/Mol y -102 J/K Mol respectivamente. Para PFO (manzana) H## fue 11582 J/Mol y (S##) fue -196 J/K Mol Resumen en inglés A study was made of the properties of polyphenyloxidase (PPO) extracted from Packam´s Triumph pears and Red Delicious apples. Optimum pH and temperature were 6.5 and 25°C for pears, pH 7 and 30°C for apples, with 50 mM catechol in phosphate buffer as substrate. K M values were 13.24 mM for pears and 232.80 mM for apples, whereas Vmax values were 1590 U/mL E for pears, and 5464 U/mL E for apples, using 50 mM catechol as a substrate. Three PPO inhibitors were tested in t (mas) his study with the most effective inhibitor being ascorbic acid. Kinetic studies showed that the thermal inactivation of PPO followed first-order kinetics. The activation enthalpy (H##) and activation entropy (S##) for PPO heat inactivation in pears was 15309 J/Mol and -102 J/K Mol respectively. In apples the H## was 11582 while the S## was -196 J/K Mol

Scientific Electronic Library Online (Spanish)

3

Synthesis of the major metabolites of Paroxetine

Segura, Mireia; Roura, Lidia; Torre, Rafael de la; Joglar Tamargo, Jesús
2003-05-28

Digital.CSIC (Spain)

5

Stereochemical analysis of 3,4-methylenedioxymethamphetamine and its main metabolites in human samples including the catechol-type metabolite (3,4-dihydroxymethamphetamine)

Pizarro, Nieves; Farré-Albaladejo, Magi; Pujadas, Mitona; Peiró, Ana María; Roset, Pere N.; Joglar Tamargo, Jesús; Torre, Rafael de la
2004-09-01

Digital.CSIC (Spain)

7

Reducing power of simple polyphenols by electron-transfer reactions using a new stable radical of the PTM series, tris(2,3,5,6-tetrachloro-4-nitrophenyl)methyl radical

Torres, Josep Lluís; Carreras, Anna; Jiménez, Aurora; Brillas, Enric; Torrelles, Xavier; Rius, Jordi; Juliá, Lluís
2007-04-17

Digital.CSIC (Spain)

8

Reducing Power of Simple Polyphenols by Electron-Transfer Reactions Using a New Stable Radical of the PTM Series, Tris (2,3,5,6-tetrachloro-4-nitrophenyl)methyl Radical.

Torres, Josep Lluís; Carreras, Anna; Jiménez, Aurora; Brillas, Enric; Torrelles, Xavier; Rius, Jordi; Juliá, Lluís
2007-04-17

Digital.CSIC (Spain)

9

New metabolites in the degradation of fluorene by Arthrobacter sp. strain F101

Casellas, Mercè; Grifoll, Magdalena; Bayona Termens, Josep María; Solanas, Anna M.
1997-03-01

Digital.CSIC (Spain)

10

Neurotoxic thioether adducts of 3,4-methylenedioxymethamphetamine identified in human urine after ecstasy ingestion

Perfetti, Ximena; O'Mathúna, Brian; Pizarro, Nieves; Cuyàs, Elisabet; Khymenets, Olha; Almeida, Bruno; Pellegrini, Manuela; Pichini, Simona; Lau, Serrine S.; Monks, Terrence J.; Farré, Magí; Pascual, José Antonio; Joglar Tamargo, Jesús; Torre, Rafael de la
2009-07-01

Digital.CSIC (Spain)

12

Genomic analysis of the aromatic catabolic pathways from Pseudomonas putida KT2440

Jiménez, José I.; Miñambres Rodríguez, Baltasar; García, José L.; Díaz, Eduardo
2002-01-01

Digital.CSIC (Spain)