precolumn meaning in English

前置柱柱前
预置柱
预柱
柱前

Determination of amino acids in food samples by high performance liquid chromatography with precolumn derivatization
柱前衍生高效液相色谱法测定食物中氨基酸含量
Simultaneous determination of amino acids in wheat by reversed phase high performance liguid chromatography with precolumn derivatization
柱前衍生反相高效液相色谱法测定小麦中氨基酸含量
The method for the determination of amino acid neurotransmitters in brain by reverse phase hplc system with the precolumn phthali aldehyde derivatization
柱前衍生反相高效液相色谱法测定脑组织中氨基酸类神经递质
Determination of t - 2 toxin in cereal grains by high performance liquid chromatography with fluorescence detection after immunoaffinity column clean - up and precolumn derivatization
高效液相色谱法检测玉米中的玉米赤霉烯酮