A gas chromatogram method to detect 3- methylindole content is est ablished.

建立了三甲基吲哚气含量测定分析方法。

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.

结果得到金霉样品液图以及液峰对应一级质图。对图进行分析归纳,推测金霉样品中含有、差向异构和差向异构金霉杂质组分。

When the solent front move to the other end，take the paper or plate out of the chamber.After the solvent is vapourized，make the chromatogram visiable by some means.

当溶剂前沿移动到另外一端时，把纸带或板从展开缸里拿出来。等溶剂挥发完后，用一定方法使图可见。