摘要
利用ｐＨ 电位法研究了甘氨酸及其二、三肽与锌、铜元素的配位作用，测定了相应的配合稳定常数，结果表明，氨基酸和二、三肽的配合行为不同，而小肽之间配位作用基本相似．ｐＨ 电位法研究还表明，铜与肽的配合过程中存在着明显的晶体场稳定化能效应，表现在配合滴定过程中出现特征颜色变化（双缩脲反应）．
Glycine and glycine peptides and their complexes with zinc(II) and copper(II) have been studied by pH potentiometic method. The stability constants for complexes were determined and the results showed that coordination existed in metal complexes of diglycine and triglycine were quite similar, which differed from that in metal glycine complexes. 1 additional equivalent base per copper(II) ion were titrated in diglycine and 2 in triglycine, as well as the characteristic color change (the 'biuret reaction') when peptides were titrated with base in the presence of copper(II) indicated that CFSE existed in copper(II) complexes of glycine peptides.
基金
江苏应用基础研究
