Caffeine Content of Specialty Coffees

Abstract

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.

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

“…[1][2][3][4][5][6][7] Up to 500 mg of caffeine can be found in commercially available 16-oz servings of brewed coffee. 8 The use of similarly high doses of caffeine-containing beverages, including energy drinks has led to a doubling of caffeine-related emergency department visits from 2007-2011. 9 The increase in ED visits in association with cardiovascular and other adverse events has been labeled a "rising public health problem in the US" and has led the Food and Drug Administration to investigate the cardiovascular safety of high caffeine content beverages.…”

Sleep and circadian misalignment for the hospitalist: A review

“…Numerous studies demonstrate that 150 mg to 400 mg of caffeine (a 16 oz ''grande'' cup of coffee from Starbucks contains between 200 to 500 mg of caffeine 52 ; a Diet Coke contains 46 mg/12 oz 53 ) reduces sleepiness, increases alertness, and improves performance during the night shift. 54,55 Thus, judicious use of caffeine may be recommended in hospital practices during extended work hours.…”