It elaborates the definitions of epimer and epimerization, states the applications of epimerization in medicine and pesticide,and points out its expansive prospect .

阐述了差体和差化的定义。差化技术在医药和农药中体中应用广泛,前景广阔。

RESULTS The chlortetracycline's epimer, tetracycline and its epimer, as impurities in chlortetracycline have been determined by the liquid chromatogram and its first order mass spectrum.

结果得到金霉素样品相色谱图相色谱峰对应的一级质谱图。对谱图进行分析归纳,推测金霉素样品中含有四环素、差四环素和差金霉素杂质组分。