Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 2010, Vol. 27 ›› Issue (12): 1434-1437.DOI: 10.3724/SP.J.1095.2010.00116

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Crystal Growth and Polymorph Control of L-Glutamic Acid on Self-Assembled Monolayers

ZHAO Xin-Mei1, WANG Hai-Shui2*   

  1. (1.Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun;
    2.School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640)
  • Received:2010-03-02 Revised:2010-04-06 Published:2010-12-10 Online:2010-12-10
  • Contact: Xinmei Zhao

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Abstract:

In this paper, we report a facile approach to obtain different polymorphs of L-glutamic acid(LGA) by crystallization on self-assembled monolayers of L-cysteine under different pH conditions. The β-glutamic acid crystals with plate-like shape were obtained at pH=2.0 and 2.5, while α-glutamic acid crystals were prepared at pH=3.0 and 4.0. The XRD results show that a small amount of β-glutamic acid crystals appear in α-glutamic acid crystals, and they are probably from the secondary nucleation of the β-form.

Key words: L-glutamic acid, Self-assembled monolayer, Polymorph selection, pH

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