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

建立了三甲基吲哚的气相色谱含量测方法。

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出来。等溶剂挥发完后，用一方法使色谱图可见。

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.

结果得到金品液相色谱图以及液相色谱峰对应的一级质谱图。对谱图进行归纳,推测金品中含有四环、差向异构四环和差向异构金杂质组。