Some properties of LiChrolut-EN resins as normal-phase sorbent have been studied. Retention factors using pentane as solvent range from less than 2 (ethyl esters) to more than 56 (fatty acids and vanillin). All retention factors were smaller than 2 with dichloromethane. 看文献发现保留因子这个概念，但是百度搜索出来的内容感觉不是我想要的答案，所以来这里请教前辈们！ 这幅图我也完全不知所云。
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