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    L(-)-Malic acid structure

    L(-)-Malic acid

    • CAS No:


    • Formula:


    • Synonyms:

      L-Malic;L-(−apple acid;)-Malic ac;L-Mailcacid;L(-)-MALATE;L-APPLE ACID;L-MALIC ACID;L-Maleic Acid;L-()-Malic ac

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    L-Malic acid is nearly odorless (sometimes a faint, acrid odor). This compound has a tart, acidic, nonpungent taste. clear colourless solution

    Basic Attributes

    • 97-67-6

    • C4H6O5

    • 134.09

    • 94.8 A^2

    • 202-601-5


    • 5

    • 3

    • 0.50

    • 3


    • White Powder

    • 1.60

    • 101-103 °C(lit.)

    • 220 °C

    • H2O: 0.5 M at 20 °C, clear, colorless

    • Store at RT.

    • 1723541

    • -2 º (c=8.5, H2O)

    Safety Information

    • 29181980

    • 3

    • 36/37/38

    • 26-36-37/39

    • ON7175000

    • Xi

    Product Usage

    Intermediate in chemical synthesis.Chelating and buffering agent.Flavoring agent, flavor enhancer and acidulant in foods.

    Production Methods

    Malic acid exists widely in nature, is the product of animal and plant metabolism, and is the main acid component in apples. Boil the juice of unripe apples, grapes and peaches, add lime water to form calcium salt precipitate, and then convert it to lead salt, and then generate free acid by treatment to obtain L-malic acid. The fermentation method is also possible to achieve industrialization. Fermentation using mutated yeasts can obtain special bacteria based on L-malic acid for acidification, or special bacteria based on production of malic acid for fermentation. L-malic acid, but the process is more complicated than the synthesis method, and the cost is higher. Japan uses biosynthesis to produce L-malic acid. First, Bredacterium ammoni-agenes cells were fixed with polyacrylamide. The suspension of cells in physiological saline is mixed with acrylic amide, an appropriate cross-linking agent and a polymerization accelerator, and the resulting gel is made into particles with a diameter of 3 mm. After washing, it was soaked in sodium fumarate containing about 0.3 bovine bile, and the solution was kept at 37°C for 20 hours. The treated cells are used as the packing of the reaction column. 1L containing 1mol of sodium fumarate passes through the reaction column at 37°C, and malic acid is separated from the effluent by the usual method, and L-malic acid pharmaceutical grade product is produced from fumaric acid with a yield of about 70% .

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