CRYSTALLIZATION BEHAVIOR AND TRANSFORMATION KINETICS OF L-HISTIDINE POLYMORPHS

被引:53
作者
KITAMURA, M
机构
[1] Department of Chemical Engineering, Hiroshima University, 4-1, Kagamiyama 1 chome
关键词
CRYSTALLIZATION; POLYMORPH; TRANSFORMATION; AMINO ACID; HISTIDINE; CRYSTAL GROWTH; TRANSFORMATION KINETICS;
D O I
10.1252/jcej.26.303
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The crystallization and transformation behavior of the polymorphs of L-histidine (A,B) and the transformation kinetics were investigated in aqueous solutions. Both polymorphs precipitate in almost the same ratio from solutions in a wide concentration range. The ratio of the polymorphs in the precipitate was scarcely influenced by temperature, unlike the behavior of L-glutamic acid. Transformation from B to A with a solution-mediated transformation mechanism occurred. The activation energy for the overall transformation was estimated as about 38 kJ/mol. From measurements of the solubilities at temperatures between 283 and 333 K, it was confirmed that A is a stable and B a metastable form. From a van't Hoff plot the heat of fusion of L-histidine polymorphs was obtained as 15 kj/mol, which is about half that of L-glutamic acid. No seed effect of either A or B crystals on the precipitation behavior was observed. A kinetic study of the transformation process was carried out and both the rate constants of growth of A (k(G)) and dissolution of B crystals (k(D)) were estimated simultaneously. At 313 K k(D) was nearly six times larger than k(G), indicating that the transformation process is growth-controlled.
引用
收藏
页码:303 / 307
页数:5
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