文献类型：期刊文献

英文题名：Effect of polymorphism on the purity of L-glutamic acid

作者：Qian, Gang[1];Wu, Yangyang[1];Yang, Xiangyu[1];Duan, Xuezhi[1];Zhou, Xinggui[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：373

起止页码：78

外文期刊名：JOURNAL OF CRYSTAL GROWTH

收录：;EI(收录号：20142317787462);WOS:【SCI-EXPANDED(收录号:WOS:000319498600015)】；

基金：This work is financially supported by the 111 Project of Ministry of Education of China (B08021).

语种：英文

外文关键词：Molecular modeling; Polymorphism; Purity; Industrial crystallization; L-Glutamic acid

摘要：The effect of polymorphism on the purity of L-glutamic acid (L-Glu) is investigated by combining experiments and molecular simulations using L-aspartic acid (L-Asp) as an impurity. The results show that the content of L-Asp in beta form is higher than that in a form, and the purity L-Glu decreases with the increase of the amount of beta form in the final product. Molecular simulation is employed to account for the different contents of L-Asp in different polymorphs of L-Glu. It reveals that L-Asp is mainly incorporated into the (011) surface of a form and the (020) surface of beta form. Because the area for alpha (011) is much smaller than that for 13 (020), beta crystal can accommodate more L-Asp than does a crystal. (C) 2012 Elsevier B.V. All rights reserved.