An apple a day keeps the doctor away. Apples contain vitamins C, B1, B2, P, E, carotene, potassium, iron, manganese, calcium, pectin, sugars, organic acids. According to cultivar, malic acid ranges from 0.4 to 1 % of the fruit. As regards sweetness, the sugars (9 –12 % of the fruit) present at harvest are sucrose and fructose, with somewhat less glucose. The bitter or astringent compounds are tannins (average 0.2 % of the fruit). Apple scent or aroma is a blend of some 250 traces of various chemical substances, such as volatile esters, alcohols, and aldehydes. Potassium is the main mineral constituent. The amount of vitamin C varies between 3 and 14 mg/100 g, but declines during storage.
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