The Studies on Brdicka's Catalytic Hydrogen-Wave:IV. The Role of Amino and Carboxyl Groups on the Catalytic Hydrogen-Waves.

スポンサーリンク

概要

• 論文の詳細を見る

• It must be naturally considered that the nature of the catalytic hydrogen wave may depend on the structure of complexant forming with cobalt and some active groups in catalyst. It is probable that the self hydryl or disulfide group has a stronger tendency to react with cobalt than the amino group or the carboxyl group . The important role of sulf hydryl group was elucidated skilfully by Ilata. It is a well known fact that most compounds containing sulfhydryl or disulfide group and amino group and/or carboxyl group give the catalytic erect in cobaltous or cobaltic solution2).<BR>Shinagawa et al.3 studied on the possibility of the Bis-cysteinate diaquocobaltate(III)4) as a catalytically active complex. The complex compound was considered to form by co ordination of nitrogen in amino group and sulfur atom in sulfhydryl group to trivalent cobalt.<BR>Although several amino acids without sulfhydryl group have also been found to give catalytic effect in cobaltous or nickelous solution, these waves have quite different patterns from those of cysteine or cystine.<BR>In this study, in order to learn more of the relation between the role of active group in the compound and the catalytic effect, L-cystine (-NH<SUB>2</SUB> -S-S-, and -COOH, i.e., three active groups), N, N'-diacetyl-L-cystine (-NHCOCH<SUB>3</SUB>, -S-S- and -COOH, i.e., defect of -NH<SUB>2</SUB>) and L-cystine-diethylester (-NH<SUB>2</SUB>, -S-S- and -COOC<SUB>2</SUB>H<SUB>5</SUB>, i.e., defect of -COON) were selected and studied in both divalent and trivalent cobalt solution. Cystine-diethylester containing two amino and a disulfide group gave a catalytic wave in both divalent and trivalent cobalt solution, but no catalytic wave was seen with diacetyl-L-cystine containing two carboxyl and a disulfide group. As for the catalytic hydrogen wave of cystine, it was found that amino group played an important role as well as sulf hydryl or disulfide group.

• 日本ポーラログラフ学会の論文

著者

• 砂原 広志

  Government Industrial Research Institute

• 砂原 広志

  Goverment Industrial Research Institute, Nagoya

関連論文

• The Studies on Brdicka's Catalytic Hydrogen-Wave:IV. The Role of Amino and Carboxyl Groups on the Catalytic Hydrogen-Waves.
• The Studies on Brdicka's Catalytic Hydrogen-Wave II, Polarography of α-Lipoic Acid in Co(II) or Co(III)-Ammoniacal Ammonium Chloride Solution.

スポンサーリンク