preparative layer chromatography

例句：

1. 1. The method of preparative thin-layer chromatography is widely used in the analysis ofcomplex samples.
   预层析薄层色谱法在复杂样品分析中被广泛应用。
2. 2. Inthis study, we used preparativethin-layer chromatography toidentify the components of the plant extract.
   在这项研究中，我们使用预层析薄层色谱法来鉴定植物提取物的组分。
3. 3. Preparative thin-layerchromatography has proven to be aneffective tool for separating and identifyingcomplex mixtures.
   预层析薄层色谱法已被证明是一种有效的工具，用于分离和鉴定复杂的混合物。