銅ヒスチジンキレートの研究(2) : ポーラログラフィーによる安定度定数の測定
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概要
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Polarographic studies were made on copper-histidine chelate to determine the composition and stability constant in aqueous solution. The results of polarographic analysis of a solution containing cupric nitrate (5×10^<-4>M) and excess histidine (2.5×10^<-2>M) at 25° are given in Table I. The electrode reaction for the copper-histidine chelate indicated that two electrons were involved, as shown by the values of (E_<3/4>〜E_<1/4>). The two molecules of histidine were found to be coordinated with each cupric ion from the slope of the plot of equation (5), as shown in Fig. 3. Further, stability constant of copper-histidine chelate was calculated to be log β=18.40 from equation (5).
- 1967-05-25