杜广才主编的医用化学第三版实验讲义中,植物药中生物碱的提取一文采用氯仿来提取咖啡因,原文如下:“将上述浓缩液约20mL移入分液漏斗,加入氯仿15mL及饱和食盐水10mL,剧烈振摇(因氯仿易挥发,所以随时放气),放置片刻。待液体分层后将下层氯仿液分离出,注入小烧杯,在水浴中蒸馏收回氯仿约10mL,停止蒸馏……” Du Guangcai editor of the third edition of medical chemistry handouts, the extraction of alkaloids in plant medicine using chloroform to extract caffeine, the original reads as follows: “The concentrate was about 20mL moved to a separatory funnel, add chloroform 15mL and saturated brine 10mL, vigorously shaken (due to chloroform volatile, so any deflation), place a moment until the liquid layering the lower chloroform solution was separated into small beakers, recovered in a water bath of chloroform about 10mL, stop distillation ... ”