Malic acid, also known as 2-hydroxysuccinic acid, has two stereoisomers due to an asymmetric carbon atom in the molecule. In nature, it exists in three forms, namely D-malic acid, L-malic acid and its mixture DL malic acid. It is white crystal or crystalline powder, has strong moisture absorption, is easily soluble in water and ethanol, and has a special pleasant sour taste. Malic acid is mainly used in food and pharmaceutical industries.
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