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A Simple Method for Isolation of Caffeine from Black Tea Leaves: Use of a Dichloromethane-Alkaline Water Mixture as an Extractant

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A Simple Method for Isolation of Caffeine from Black Tea Leaves: Use of a Dichloromethane-Alkaline Water Mixture as an Extractant

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Department of Chemistry, Fukushima Medical College, Hikarigaoka, Fukushima 960-12, Japan
Fukushima University, Fukushima 960-12, Japan
Cite this: J. Chem. Educ. 1996, 73, 6, 556
Publication Date (Web):June 1, 1996
https://doi.org/10.1021/ed073p556
© American Chemical Society and Division of Chemical Education, Inc.
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    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).

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