I. General Information
Malic acid is a hydroxydicarboxylic acid found in all forms of life and exists naturally only as the L-enantiomer. It should not be confused with maleic and malonic acids. L-Malic acid gives many fruits, particularly apples, their characteristic flavor.
Maleic acid or cis-butenedioic acid is an organic compound that is a dicarboxylic acid with two carboxyl groups. Its chemical formula is HO₂CCH=CHCO₂H. It is the cis isomer of butenedioic acid, whereas fumaric acid is the trans isomer.
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II. Chemical Structures
Malic acid: Chemical formula is C₄H₆O₅. Contains two carboxyl groups (-COOH) and a hydroxyl group (-OH).
Maleic acid: Chemical formula is C₄H₄O₄. Has two carboxyl groups attached to a double-bonded carbon-carbon chain.
III. Taste and Food Applications
Malic acid: Has a tart taste and is widely used as a food additive for flavoring and acidity regulation in candies, beverages, and processed foods. Found in fruits like apples.
Maleic acid: Is not used as a food additive for taste. Mainly used in industrial applications and not for consumption due to potential toxicity.
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IV. Industrial and Cosmetic Uses
Malic acid: Used in the food industry, cosmetics industry (in skin and hair care products like body lotion, shampoos, acne and anti-ageing products), and as a chelating agent in some chemical processes.
Maleic acid: Mainly used in the production of unsaturated polyester resins, plasticizers, and other industrial chemicals. Also used in the manufacture of dyes and pharmaceuticals.
V. Biological Functions (Malic Acid Only)
It produces chemical energy that is mainly required for regulating energy production, easing bodily discomfort, detoxification, and oral hygiene.
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