Abstract
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° C and m=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.
| Original language | English |
|---|---|
| Pages (from-to) | 755-759 |
| Number of pages | 5 |
| Journal | analytical sciences |
| Volume | 8 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jan 1 1992 |
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All Science Journal Classification (ASJC) codes
- Analytical Chemistry
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Speciation Studies of Some Metal Complexes with L-Aspartyl-L-phenylalanine Methyl Ester by Potentiometry. / AiHARA, Makoto; Tanaka, Fudeko; Fujimoto, Minori; Takehara, Ko.
In: analytical sciences, Vol. 8, No. 6, 01.01.1992, p. 755-759.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Speciation Studies of Some Metal Complexes with L-Aspartyl-L-phenylalanine Methyl Ester by Potentiometry
AU - AiHARA, Makoto
AU - Tanaka, Fudeko
AU - Fujimoto, Minori
AU - Takehara, Ko
PY - 1992/1/1
Y1 - 1992/1/1
N2 - 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° C and m=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.
AB - 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° C and m=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.
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U2 - 10.2116/analsci.8.755
DO - 10.2116/analsci.8.755
M3 - Article
VL - 8
SP - 755
EP - 759
JO - Analytical Sciences
JF - Analytical Sciences
SN - 0910-6340
IS - 6
ER -