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Acute ingestion of caffeine in large doses (at least 250–300 mg, equivalent to the amount found in 2–3 cups of coffee or 5–8 cups of tea) results in a short-term stimulation of urine output in individuals who have been deprived of caffeine for a period of days or weeks. [92]
41 mg 35 mg 6% 1 cup of black tea (mean 35 mg caffeine), 1 oz rum (40%) Rev: Cola: 38 mg 8 mg 7% 473 ml cola (37.84 mg caffeine: cola contains 8 mg/100 ml in average), [5] Jägerbomb: Caffeinated energy drink: 29 mg 21 mg 3.5% 1/2 (125 ml) can energy drink (30 mg caffeine). 1/2 oz Jägermeister (35%) Vodka Red Bull: red bull: 26 mg 80 mg 20 % ...
194.194 g·mol −1 Appearance Odorless, white needles or powder Density: 1.23 g/cm 3, solid [1] Melting point: 227 to 228 °C (441 to 442 °F; 500 to 501 K) (anhydrous) 234 to 235 °C (453 to 455 °F; 507 to 508 K) (monohydrate) Boiling point: 178 °C (352 °F; 451 K) (sublimation)
According to the USDA National Nutrient Database, a 240-millilitre (8 US fl oz) cup of "coffee brewed from grounds" contains 95 mg caffeine, whereas an espresso (25 mL) contains 53 mg. [187] According to an article in the Journal of the American Dietetic Association, coffee has the following caffeine content, depending on how it is prepared: [184]
The 473 ml (16 ounce) cups of coffee samples contained caffeine in the range of 8.6 mg to 13.9 mg. In another study of popular brands of decaf coffees, the caffeine content varied from 3 mg to 32 mg. [ 22 ] In contrast, a 237 ml (8 ounce) cup of regular coffee contains 95–200 mg of caffeine, [ 23 ] and a 355 ml (12 ounce) serving of Coca-Cola ...
The chemical complexity of coffee is emerging, especially due to observed physiological effects which cannot be related only to the presence of caffeine. Moreover, coffee contains an exceptionally substantial amount of antioxidants such as chlorogenic acids, hydroxycinnamic acids, caffeine and Maillard reaction products, such as melanoidins. [3]
There is no standard value for "a cup of coffee." The caffeine content of cola drinks and most energy drinks can be difficult to determine, because in many cases the labels do not indicate the dose per serving. Caffeine doses in these beverages range from 20 to 30 mg in some soft drinks, up to 350 mg or more in some energy drinks.
Free caffeic acid can be found in a variety of beverages, including brewed coffee at 63.1-96.0 mg per 100 ml [7] and red wine at 2 mg per 100 ml. [8] It is found at relatively high levels in herbs of the mint family, especially thyme, sage and spearmint (at about 20 mg per 100 g), and in spices, such as Ceylon cinnamon and star anise (at about 22 mg per 100 g).