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.

Caffeine content of conventional and non conventional foods on the Hungarian market

“…Caffeine content data of different food items investigated in the present study are comparable to those published by other authors (SHIVELY & TARKA, 1984;CAMARGO et al, 1999, CAUDLE et al, 2001MCCUSKER et al, 2003MCCUSKER et al, , 2006a2006b;PENA et al, 2005;CHOU & BELL, 2007;OLMOS et al, 2009;HECKMAN et al, 2010). These data show that there are some special caffeine sources like cakes, biscuits or cottage cheese based desserts containing cocoa or chocolate, but it is supposed that these foods do not contribute at a high level in the intake of caffeine.…”

Caffeine Effects on Sleep Taken 0, 3, or 6 Hours before Going to Bed

“…The amount of caffeine in specific beverages/sources was determined based on information provided at the brand website and published literature. 33 If home-brewed coffee was indicated, an 8-oz cup was calculated to be equal to 100 mg of caffeine (1 serving). Subjects were selected if they met either of the following criteria: (1) ≥ 3 servings of caffeine in any single day or (2) ≥ 5 caffeinated servings per week.…”

Consumption Patterns and Side Effects of Energy Drinks among University Students in Palestine: Cross-Sectional Study

“…Caffeine in energy drinks will provide the consumer the desirable effects of increased alertness, improved memory and enhanced mood. However, caffeine can have harmful physical consequences, including central nervous system, cardiovascular, gastrointestinal and renal dysfunction [22] Energy drinks contain between 14 and 31 mg of caffeine per 100 ml [23]. Although their caffeine concentration (in milligrams per milliliter) may be similar to coffee, energy drinks are often packaged in significantly higher volumes, resulting in increased caffeine intake [24].…”