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Caffeine Properties Chemical formula. C 8 H 10 N 4 O 2: Molar mass: 194.194 g·mol −1 Appearance Odorless, white needles or powder Density: ... 192 mg/kg (rat, oral ...
A study found that the caffeine content of one gram of black tea ranged from 22 to 28 mg, while the caffeine content of one gram of green tea ranged from 11 to 20 mg, reflecting a significant difference. [58] Tea contains small amounts of theobromine and theophylline, which are xanthines and stimulants, similar to caffeine. [59]
Plasma caffeine levels are usually in the range of 2–10 mg/L in coffee drinkers, 12–36 mg/L in neonates receiving treatment for apnea, and 40–400 mg/L in victims of acute overdosage. Urinary caffeine concentration is frequently measured in competitive sports programs, for which a level in excess of 15 mg/L is usually considered to ...
Cocaine Energy Drink contains 280 mg caffeine. [13] Caffeine is also a common ingredient of soft drinks, such as cola, originally prepared from kola nuts. Soft drinks typically contain 0 to 55 milligrams of caffeine per 12 ounce serving. [14] By contrast, energy drinks, such as Red Bull, can start at 80 milligrams of caffeine per serving.
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.
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. [189] According to an article in the Journal of the American Dietetic Association, coffee has the following caffeine content, depending on how it is prepared: [186]
With a caffeine concentration of 47 mg per 100 ml, these bottles contain 282 mg. [12] For many years, Jolt has not been available (for example in capital cities such as Canberra or Brisbane); however the Jolt Cola Australian website has a shopping section and claims to deliver to the door; primarily 330mL bottle volumes in cases of fifteen bottles.
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).