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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- Hirata Makoto
- Department of Chemical Engineering, Waseda Universitly
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- Nemoto Katsumi
- Department of Chemical Engineering, Waseda Universitly
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- Hirata Akira
- Department of Chemical Engineering, Waseda Universitly
書誌事項
- タイトル別名
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- Solubility of Al (Benzyloxycarbonyl)-L-Aspartyl-L-Phenylalanine Methyl Ester Forming a Complex with L-Phenylalanine Methyl Ester in Aqueous System.
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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.
収録刊行物
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- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
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JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 27 (1), 72-76, 1994
公益社団法人 化学工学会
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詳細情報 詳細情報について
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- CRID
- 1390001204564574848
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- NII論文ID
- 130000021383
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- NII書誌ID
- AA00709658
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- COI
- 1:CAS:528:DyaK2cXjt1Wgu7s%3D
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- ISSN
- 18811299
- 00219592
- http://id.crossref.org/issn/00219592
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可