Sample records for cyclohexanone
from WorldWideScience.org

Sample records 1 - 2 shown.



1

Investigação da presença de efedrinas em Ephedra tweediana Fisch & C.A. Meyer e em E. triandra Tul. (Ephedraceae) coletadas em Porto Alegre/RS/ Investigation of the presence of ephedrines in Ephedra tweediana Fisch & C.A. Meyer and E. triandra Tul. (Ephedraceae) collected in Porto Alegre/RS

Boff, Bruna de S.; Sebben, Viviane C.; Paliosa, Patrícia K.; Azambuja, Ingrid; Singer, Rodrigo B.; Limberger, Renata P.
2008-09-01

Resumo em português Amostras de Ephedra tweediana Fisch & C.A. Meyer, coletadas de populações nativas da Reserva Biológica do Lami José Lutzenberger (Porto Alegre, RS, Brasil), e amostras de Ephedra triandra Tul., obtidas de plantas cultivadas em Porto Alegre/RS, foram extraídas com acetona, derivatizadas com ciclohexanona e analisadas por CG/EM. Para verificação da eficiência da metodologia, além das amostras de Ephedra tweediana e E. triandra, foram analisadas cinco amostras comer (mais) ciais de Ephedra, de procedências distintas, cedidas por farmácias de manipulação locais. Os resultados encontrados indicam a ausência de efedrinas em Ephedra tweediana e E. triandra e presença de efedrina e/ou pseudoefedrina nas amostras comerciais. Resumo em inglês Samples of Ephedra tweediana, collected from native populations occurring in the Reserva Biológica do Lami José Lutzenberger (Porto Alegre, RS, Brazil), and from cultivated plants of Ephedra triandra were submitted to extraction with acetone, derivatized with cyclohexanone and analyzed by GC/MS. In order to verify the efficiency of the methodology, besides Ephedra tweediana and E. triandra, samples of five commercial Ephedra extracts were analyzed, from distinct origins (mais) , get up from local drugstores. The results showed the absence of ephedrines in Ephedra tweediana and E. triandra, and the presence of ephedrine and/or pseudoephedrine in commercial samples.

Scientific Electronic Library Online (Portuguese)

2

Desenvolvimento, caracterização e aplicação eletroanalítica de um compósito fluido de adesivo epóxi, grafite e ciclo-hexanona/ Development, characterization and electroanalytical application of a fluid composite made of epoxy adhesive, graphite, and ciclohexanone

Silva, Rodrigo Amorim Bezerra da; Rabelo, Adriano César; Bottecchia, Otávio Luiz; Muñoz, Rodrigo Alejandro Abarza; Richter, Eduardo Mathias
2010-01-01

Resumo em inglês A fluid conducting composite material prepared from graphite powder, commercial epoxy resin Araldite®, and cyclohexanone has been developed. The composition was optimized considering the mechanical properties as conductivity and adhesiveness using response surface methodology. This work employed cyclic voltammetry and amperometry to investigate the characteristics of such composite electrodes without and with the insertion of Prussian blue in the electrode body (bulk mod (mais) ified electrode). The composite electrodes were also successfully used for the amperometric detection of hydrogen peroxide at 0.0V vs Ag/AgCl.

Scientific Electronic Library Online (Portuguese)