Malic acid
Diffination:
Malic acid is an organic compound with the molecular formula C4H6O5. It is a dicarboxylic acid that is made by all living organisms, contributes to the pleasantly sour taste of fruits, and is used as a food additive. Malic acid has two stereoisomeric forms (L- and D-enantiomers), though only the L-isomer exists naturally. The salts and esters of malic acid are known as malates. The malate anion is an intermediate in the citric acid cycle.
Malic acid, a natural substance found in fruits and vegetables, is commonly associated with apples. The body produces malic acid when it converts carbohydrates into energy. Taking malic acid supplements is beneficial for conditions such as fibromyalgia and chronic fatigue syndrome. It can help with oral hygiene as well.
Specification:
Characters    White crystal or crystalline powder with high water absorbability and easily soluble in water and ethanol
Content (Based on C4H6O5)    %               99.0~100.5
Fumaric Acid    %    ≤1.00
Maleic Acid    %    ≤0.05
Heavy Metal (Based on Pb)    ppm    ≤10
Arsenic (As)    ppm    ≤2
Ignition Residue    %    ≤0.10
Water Insoluble Matters    %    ≤0.10
Specific Rotation [α]20    /    ) -0.10~+0.10°