α-ヒドロキシイミノ脂肪酸のポーラログラフィーおよび定電位電解還元

抄録

Polarographic behavior of six kinds of α-hydroxyimino-fatty acid was examined and their reduction mechanism was examined by the controlled potential electrolytic reduction, α-Hydroxyimino-fatty acids show distinct one-step wave in strongly acid solution and its electrolytic reduction mechanism was found to be the four-electron reduction of the hydroxyimino group in non-dissociated acid to amino group, forming the corresponding α-amino acid. By the use of this reaction, controlled potential electrolysis of α-hydroxyimino acid was carried out in strongly acid solution, with mercury cathode, and six kinds of corresponding α-amino acid were obtained in 97-98% yield. The use of lead cathode resulted in considerable decrease in the yield and current efficiency. For quantitative determination of α-hydroxyimino-fatty acids, the best result was obtained by carrying out the reaction at pH 2.