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The Extraction of Caffeine from Tea: An Old Undergraduate Experiment Revisited

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Scott D. Murray and Peter J. Hansen

Northwestern College, Orange City, IA 51041

J. Chem. Educ., 1995, 72 (9), p 851

DOI: 10.1021/ed072p851

Publication Date: September 1995

Abstract

The extraction of caffeine from tea leaves is a common organic chemistry experiment. A water/1-propanol/sodium chloride ternary system was found to be a suitable replacement for the more traditional water/organochlorine solvent systems. Approximately 80% of the caffeine in the tea leaves can be recovered as crude caffeine. The ternary system employs chemicals which are not only less expensive, but also less toxic.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Organic Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Separation Science

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Testing for Chemical Health and Safety Understanding
Lucy Pryde Eubanks
1998 700 (), 165-177
- Testing for Chemical Health and Safety Understanding
  Lucy Pryde Eubanks
  1998 700 (), 165-177
  There is one sure way to help guarantee that chemical health and safety concerns are taken seriously - test for them! Every student has at some point asked the question—"Is it going to be on the test?"— when what was really being asked was whether or not ...
  Abstract | Hi-Res PDF | PDF w/ Links
The Extraction of Caffeine from Tea: A Modification of the Procedure of Murray and Hansen
Andreas Hampp
Journal of Chemical Education1996 73 (12), 1172
- The Extraction of Caffeine from Tea: A Modification of the Procedure of Murray and Hansen
  Andreas Hampp
  Journal of Chemical Education1996 73 (12), 1172
  According to the literature published, the "Extraction of Caffeine from Tea" is certainly one of the most common experiments in undergraduate laboratories. The extraction was generally done using chloroform (1 - 3), or methylene chloride (4 - 7), solvents ...
  Abstract | Hi-Res PDF | PDF w/ Links