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.
结果得到霉素样品谱图以及谱峰对应的一级质谱图。对谱图进行析归纳,推测霉素样品中含有四环素、差向异构四环素和差向异构霉素杂质组。