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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 rag/serving. The caffeine content of the carbonated sodas rangeddoi:10.1093/jat/30.2.112 pmid:16620542 fatcat:lm2ogv27wzhfjlufnp247v3e5q