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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > June  >
Laboratory Experiments
A Simple Method for Isolation of Caffeine from Black Tea Leaves: Use of a Dichloromethane-Alkaline Water Mixture as an Extractant
Tetsuo Onami
Department of Chemistry, Fukushima Medical College, Hikarigaoka, Fukushima 960-12, Japan

Hitoshi Kanazawa
Fukushima University, Fukushima 960-12, Japan

Cover
June 1996
Vol. 73 No. 6
p. 556
Abstract
A simple procedure for the isolation of caffeine from tea leaves has been established without using hot or boiling water. A mixture of tea leaves, dichloromethane, and 0.2 M NaOH was shaken for 7 min, and the organic layer was separated. After evaporation of the organic solvent, residual crystals were purified by recrystallization to give 20-30 mg (student yield) of pure caffeine from one tea bag (2 g).
More Information
*  Citation
 Onami, Tetsuo; Kanazawa, Hitoshi. J. Chem. Educ. 1996 73 556.
*  Keywords
*  History
 Created:
Last Updated:		 9/23/1999
5/22/2006
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