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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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Tetsuo Onami

Department of Chemistry, Fukushima Medical College, Hikarigaoka, Fukushima 960-12, Japan

Hitoshi Kanazawa

Fukushima University, Fukushima 960-12, Japan

J. Chem. Educ., 1996, 73 (6), p 556

DOI: 10.1021/ed073p556

Publication Date (Web): June 1, 1996

Section:

History, Education, and Documentation

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).

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Organic Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Crystals / Crystallography

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

The Isolation of Rubber from Milkweed Leaves. An Introductory Organic Chemistry Lab
Lisa Volaric and John Hagen
Journal of Chemical Education2002 79 (1), 91
- The Isolation of Rubber from Milkweed Leaves. An Introductory Organic Chemistry Lab
  Lisa Volaric and John Hagen
  Journal of Chemical Education2002 79 (1), 91
  We present an introductory organic chemistry lab in which students isolate rubber from the leaves of milkweed plants (Asclepias syriaca). Students isolated rubber with a recovery of 2.4 ± 1.8% and 1.8 ± 0.7% for the microscale and macroscale procedures, ...
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