title: Caffeine content of energy drinks, carbonated sodas, and other beverages.
abstract: The caffeine content of 10 energy drinks, 19 carbonated sodas, and 7 other beverages was determined. In addition, the variability of the caffeine content of Coca-Cola fountain soda was evaluated. Caffeine was isolated from the samples by liquid-liquid extraction and analyzed by gas chromatography with nitrogen-phosphorus detection. The caffeine concentration of the caffeinated energy drinks ranged from none detected to 141.1 mg/serving. The caffeine content of the carbonated sodas ranged from none detected to 48.2 mg/serving, and the content of the other beverages ranged from < 2.7 to 105.7 mg/serving. The intra-assay mean, standard deviation, and % coefficient of variation for the Coca-Cola fountain samples were 44.5, 2.95, and 6.64 mg/serving, respectively.
authors.affiliation: Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, P.O. Box 100275, Gainesville, FL 32610-0275, USA.
authors.forename: Rachel R
authors.initials: RR
authors.lastname: McCusker
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Goldberger
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Cone
mesh_terms: D002110:Caffeine / Q000032:analysis*; D002253:Carbonated Beverages / Q000032:analysis*; D000697:Central Nervous System Stimulants / Q000032:analysis*; D002849:Chromatography, Gas; D005503:Food Additives / Q000032:analysis
chemical_list: D000697:Central Nervous System Stimulants; D005503:Food Additives; D002110:Caffeine