SOLUBILITY OF N-(BENZYLOXYCARBONYL)-L-ASPARTYL-L-PHENYLALANINE METHYL ESTER FORMING A COMPLEX WITH L-PHENYLALANINE METHYL ESTER IN AQUEOUS SYSTEM
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概要
- 論文の詳細を見る
The solubility of N-(benzyloxycarbonyl)-L-aspartyl-L-phenylalanine methyl ester (Z-APM) was studied in an aqueous system with coexisting L-phenylalanine methyl ester (L-Phe-OMe). It was found that the Z-APM solubility shows very complicated behavior. Under acidic pH condition (pH < 3.5), pure Z-APM was precipitated and the solubility increased uniformly with increasing pH and L-Phe-OMe concentration. Under moderate pH condition (4.5 < pH < 8), Z-APM was precipitated with L-Phe-OMe, forming a complex of Z-APM·L-Phe-OMe. The solubility varied with the pH following a U-shaped curve and decreased with increasing L-Phe-OMe concentration at the same pH. The pH value at the transient point from pure Z-APM precipitation to Z-APM·L-Phe-OMe precipitation shifted toward acidic pH with increasing L-Phe-OMe concentration. From the experimental results it was assumed that the Z-APM·L-Phe-OMe complex was not only formed by ionic bond. An equilibrium model of the precipitation considering the formation of complex was proposed that well explains the complicated behavior of the solubility.
- 社団法人 化学工学会の論文
- 1994-02-20
著者
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HIRATA MAKOTO
Department of Applied Chemistry, Oita University
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Hirata Makoto
Department Of Chemical Engineering Waseda University
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Hirata Akira
Department Of Chemical Engineering Waseda University
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NEMOTO Katsumi
Department of Chemical Engineering, Waseda University
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Nemoto Katsumi
Department Of Chemical Engineering Waseda University
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Hirata Makoto
Department Of Applied Chemistry Oita University
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Hirata Makoto
Department of Agricultural Chemistry, Faculty of Agriculture, Kyushu University
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