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nature : names hydroxy succinate. White crystals. As a molecule asymmetric carbon atoms, two stereoisomers. (1) S - or R - (+) - malic acid. Density 1.595, the melting point of 101 ° C and 140 ° C decomposition point, specific rotation +2.92 ° (methanol), soluble in water, methanol, ethanol, acetone. (2) L-body or S - (-) - malic acid, the density of 1.595, the melting point of 100 ° C and 140 ° C decomposition point, specific rotation -2.3 ° (8.5 grams / 100 ml of water), soluble in water, methanol, acetone , 2 dioxane, benzene insoluble. L-contour the body and dextral mix in raceme. Density 1.601; 131-132 ° C melting point, the decomposition point 150 ° C; Dissolved in water, methanol, ethanol, 1,4 - Dioxane, acetone, benzene insoluble. The most common is the L-body, in the presence of immature hawthorn, apple and grape fruit realize China. Also be Fumarate by biological fermentation obtained. BNDADA from fumaric acid or Malay catalyst under high temperature and pressure conditions and water vapor in the system. Malic acid can be used drugs, soft drinks, candy manufacture.
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