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"。
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.
出处
《应用化学》
CAS
CSCD
北大核心
2010年第12期1434-1437,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20873136)资助项目
关键词
L-谷氨酸
自组装单层
晶型控制
PH
L-glutamic acid
self-assembled monolayer
polymorph selection
pH
