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Published:
Journal of Analytical Toxicology,
ISSN 0146-4760,
Volume 27, Number 7, October 2003,
pp. 520-522
TECHNICAL NOTE: Caffeine Content of Specialty Coffees
Rachel R. McCusker[1] Bruce A. Goldberger[1],[2],
and Edward J. Cone[3]
[1]Department of Pathology, Immunology, and Laboratory Medicine and
[2]Department
of Psychiatry, University of Florida College of Medicine, P.O. Box 100275,
Gainesville, Florida 32610-0275 and
[3]ConeChem Research, LLC, 441 Fairtree
Drive, Severna Park, Maryland 21146
Caffeine is the world’s most widely consumed drug with
its main source found in coffee. We evaluated the caffeine content of caffeinated
and decaffeinated specialty coffee samples obtained from coffee shops. Caffeine
was isolated from the coffee by liquid–liquid extraction and analyzed
by gas chromatography with nitrogen-phosphorus detection. In this study, the
coffees sold as decaffeinated were found to have caffeine concentrations less
than 17.7 mg/dose. There was a wide range in caffeine content present in caffeinated
coffees ranging from 58 to 259 mg/dose. The mean (SD) caffeine content of the
brewed specialty coffees was 188 (36) mg for a 16-oz cup. Another notable find
is the wide range of caffeine concentrations (259–564 mg/dose) in the
same coffee beverage obtained from the same outlet on six consecutive days. Reproduction
of editorial content of this journal is prohibited without publisher’s
permission.
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