pre-column derivatization

例句：

1. 1. The process of pre-column derivatization is crucialfor the accurate determination of compounds in complexmatrices.
   预柱后衍生化过程对于复杂基质中化合物准确测定至关重要。
2. 2. In thisstudy, we applied a new method forpre-column derivatization toimprove the detection sensitivity of analytes in real samples.
   在这项研究中，我们应用了一种新的方法进行预柱衍生化，以提高真实样品中分析物检测的灵敏度。
3. 3. The pre-column derivatization step is essential for theseparation of polar and nonpolar compounds ingas chromatography.
   预柱衍生化步骤是气相色谱分离极性和非极性化合物的关键步骤。