University Chemistry ›› 2019, Vol. 34 ›› Issue (3): 42-46.doi: 10.3866/PKU.DXHX201807053

• Chemistry Laboratory • Previous Articles     Next Articles

Improvement and Exploration of Experimental Setup for Extraction of Caffeine from Tea

Yunying WU1,Jianxin XIE1,Xianxue WU1,Wenjing CHEN1,Gaozhang GOU2,*()   

  1. 1 College of Chemistry Biology and Environment, Yuxi Normal University, Yuxi 653100, Yunnan Province, P. R. China
    2 School of Science, Honghe University, Mengzi 661199, Yunnan Province, P. R. China
  • Received:2018-07-28 Accepted:2018-09-04 Published:2019-03-09
  • Contact: Gaozhang GOU
  • Supported by:


The extraction experiment of caffeine from tea was a classic experiment in Organic Chemistry Laboratory. In this paper, the original Soxhlet extractor device used in the experiment was modified and obtained the internal ventilation Soxhlet extractor, which was used in laboratory teaching. The extraction effects of the improved Soxhlet extractor and the original Soxhlet extractor were compared by the control experiment. The results showed that the improved device keeps the function and characteristics of the original devicewith the shorter the extraction time, higher extraction temperature and the extraction rate. Thus, it may provide an alternative for college organic laboratory teaching.

Key words: Caffeine, Organic chemistry laboratory, Soxhlet extractor, Device improvement