The basic flavors of coffee are sour, bitter and sweet. Sour taste is a basic taste of coffee, caused by organic acid, Taiwan citric acid, malic acid and so on. The second is the bitterness of coffee caused by caffeine, quinine and some alkaloids, which is another basic taste of coffee. Good coffee has a certain degree of bitterness. The sucrose and fructose in coffee lead to the taste of coffee, which is also an aspect to describe the flavor of coffee.
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