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Caffeine and Coffee
Perhaps the most important thing to know about coffee and caffeine is that the strength of a coffee's taste has little or nothing to do with how much caffeine it contains. While caffeine itself has a slightly bitter flavor, our perception of strength comes basically from the degree of roast (the darker the "stronger") and the ratio of coffee to water used during the brewing process which creates the actual strength of the coffee.
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Caffeine content of a 5 fluid ounce cup of regular coffee will range from 60mg to 180mg, depending on the types of coffees used in the blend and brew strength of the coffee.
Caffeine content of a 1 ½ ounce cup of espresso coffee will range from 90 to 120mg, depending on the types of coffees used in the blends and strength of the brew.
Caffeine is altered very little by the roasting process. It is readily water soluble at temperatures above 170°F and consequently is fully released into the finished beverage during brewing
Caffeine varies between species of coffee trees. Arabica coffees contain about 1% caffeine by weight in green form, while Robusta beans contain about 2% weight.
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