目的：建立能够区分西咪替丁片剂中不同晶型的溶出度试验法。
Objective:To establish a dissolution method to distinguish polymorphism A and B of cimetidine tab-lets.
不同种类保护剂的抑制共晶的能力从强到弱依次是甘油、乙二醇、 DMSO、 1，2 丙二醇和1，3丁二醇。
The restrain effect of cryoprotective agents on eutectic is different. The best is glycerol and then is ethylene glycol, DMSO, 1,2 propylene glycol and 1,3 butanediol respectively.
以对羟基苯甲酸甲酯、1，4丁二醇为主要原料，经熔融酯交换合成介晶基元双-对羟基苯甲酸丁二醇酯（BBHB）；
Bis(p-hydroxybenzonic acid butanediolate)(BBHB)as mesogenic unit was prepared with methyl p-hydroxybenzoate, 1,4-butanediol and catalyst by melting transesterification.
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