SPECIATION STUDIES OF SOME METAL-COMPLEXES WITH L-ASPARTYL-L-PHENYLAANINE METHYL-ESTER BY POTENTIOMETRY

被引:5
作者
AIHARA, M [1 ]
TANAKA, F [1 ]
FUJIMOTO, M [1 ]
TAKEHARA, K [1 ]
机构
[1] KYUSHU UNIV,COLL GEN EDUC,FUKUOKA 810,JAPAN
关键词
STABILITY CONSTANT; METAL COMPLEX; L-ASPARTYL-L-PHENYLALANINE METHYL ESTER;
D O I
10.2116/analsci.8.755
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The stoichiometry and stability constants of the complexes formed between nickel(II), cobalt(II), copper(II) and manganese(II) with L-aspartyl-L-phenylalanine methyl ester (aspartame, LH) have been determined potentiometrically at 25-degrees-C and mu=0.1. Nickel(II) and cobalt(II) react with aspartame to form ML, ML2 and ML3 type complexes. Copper(II) forms ML and ML2 type complexes. On the other hand, manganese(II) forms ML type complexes. The Irving-Williams' order, Co(II)<Ni(II) <Cu(II), was found to be satisfied for ML+ complexes. Complex distribution depending on pH and metal/aspartame ratio is given for these systems.
引用
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页码:755 / 759
页数:5
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