What's in coffee? The composition of coffee beans includes (g%): fats - 13.9; digestible carbohydrates - 4.1; tannins - 5.5; caffeine - 1.5; esters of quinic and caffeic acids - 6.5; trigonelline - 1; purine bases - 1.2; minerals and trace elements - 5; oxalic acid - 0.4. It also contains more than 200 substances that can be identified by good tasters. 75% of the composition of raw grains is made up of indigestible polysaccharides.
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