应用化学 ›› 2010, Vol. 27 ›› Issue (12): 1434-1437.DOI: 10.3724/SP.J.1095.2010.00116

• 研究论文 • 上一篇    下一篇

自组装单层上谷氨酸晶体的生长和晶型控制

赵新梅1,王海水2*   

  1. (1.中国科学院长春应用化学研究所 长春;2.华南理工大学化学与化工学院 广州 510640)
  • 收稿日期:2010-03-02 修回日期:2010-04-06 出版日期:2010-12-10 发布日期:2010-12-10
  • 通讯作者: 王海水,男,教授; E-mail:wanghsh@scut.edu.cn; 研究方向:有序分子膜和晶体
  • 基金资助:
    国家自然科学基金(20873136)资助项目

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

摘要:

报道了谷氨酸晶体在L-半胱氨酸自组装单层上的成核和生长。 在L-半胱氨酸单层的诱导作用下,通过改变溶液的pH值,可以制备出不同晶型的L-谷氨酸,这为控制谷氨酸的晶型提供了一个简单的方法。 在pH值为2.0和2.5条件下,可得到六边形片状的β-谷氨酸,而在pH值为3.0和4.0时得到棱柱状的α晶体。 XRD结果表明,α晶体内有少量的β-谷氨酸晶体出现,这可能来自于β-谷氨酸的“二次成核”。

关键词: L-谷氨酸, 自组装单层, 晶型控制, pH

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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