Abstract

The effect of the pH of the medium, the volume ratio of the extractant to water on the efficiency of caffeine extraction with acetonitrile from aqueous solutions by extractive freezing-out in a centrifugal force field is studied. The results can be explained in terms of the previously proposed theoretical process model. The highest recovery of caffeine was achieved at pH 6–7. The limit of determination of caffeine in water is 0.015 μg/mL.

中文翻译：

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在离心力场中从水溶液中萃取咖啡因

摘要

研究了介质的pH值，萃取剂与水的体积比对在离心力场中通过萃取性冷冻作用从水溶液中乙腈萃取咖啡因效率的影响。结果可以根据先前提出的理论过程模型进行解释。在6–7的pH下，咖啡因的回收率最高。水中咖啡因的测定极限为0.015μg/ mL。