This is the second most popular general purpose food acid although less than one-tenth the quantity of citric acid used. Malic acid is a white, odorless, crystalline powder or granule with a clean tart taste with no characterizing flavor of its own. The properties of malic acid are listed in Table 1.
Malic acid is made through chemical synthesis by the hydration of maleic acid. An inspection of its structure in Table 1 reveals that malic acid has an asymmetric carbon which provides for the existence of isomeric forms. The synthetic procedure for malic acid produces a mixture of the D and L isomers. The item of commerce, racemic D, L-malic acid does not occur in nature (3) although the acid is affirmed as GRAS for use in foods.
L-Malic acid is the isomeric form that is found in nature. It is the predominant acid in substantial quantity in apples and cherries and in lesser quantities in prunes, watermelon, squash, quince, plums, and mushrooms. Like citric acid, L-malic acid plays an essential part in carbohydrate metabolism in man and other animals.
There are no salts of malic acid that are items of commerce for the food and beverage industries. The application for malic and citric acid cover the same broad range of food categories.
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It is a well known fact that homemade food is always a healthier option for pets when compared to the market packed food. The increasing hazards to the health of the pets have made pet owners stick to containment of commercial pet food. The basic fundamentals of health for human beings are applicable for pets also.