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做氨茶硷的定性试验之一,系利用其水溶液加稀盐酸后游离出茶硷的反应,并测其熔点以进行鉴别。但在试验过程中,往往在滴加完盐酸后,虽经多次搅动,亦无茶硷结晶析出。经多次试验结果,认为按下法处理,结果较好;即于滴加完稀盐酸后,将此溶液放置水箱中,至温度降为4℃左右,并用玻捧不停搅动,茶硷即大量析出。滤过后,滤渣按中国药典规定,用少量
To do one of the qualitative tests of ammonia theophylline, Department of the use of its aqueous solution plus diluted hydrochloric acid free theophylline reaction, and measured its melting point for identification. However, in the course of the experiment, often after dropwise addition of hydrochloric acid, although repeated by agitation, no theophylline crystallized. After several test results, that the press method, the result is better; that is, after the dropwise addition of dilute hydrochloric acid, the solution was placed in a water tank, the temperature dropped to about 4 ℃, and kept stirring with glass, theophylline that A lot of precipitation. After filtration, the residue according to Chinese Pharmacopoeia, with a small amount