提取分离时，用来分离极性不同的两种物质的溶剂叫做展开剂，选择适当的展开剂是首要任务。一般常用溶剂按照极性从小到大的顺序排列大概为：石油醚<己烷<苯<乙醚。
n. developer
misc. developing solvent
确定了溶剂的精确配比，选择了适宜的展开剂。
The precision ratio of solvent was confirmed, and feasible spread solvent was selected.
氨基酸层析分析时，将显色剂茚三酮直接溶于展开剂中。
Developer was combined with spray reagent in amino acid chromatography analysis.
目的替换《中国药典》(2005年版一部)薄层鉴别中使用苯和甲苯的展开剂。
Objective to replace the developing agents benzene and toluene in thin-layer chromatography in the Chinese Pharmacopoeia 2005 Volume I.
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