Overview
DL-Malic Acid is a racemic mixture of D- and L-malic acid isomers, naturally found in fruits like apples. It is synthesized industrially via hydration of maleic or fumaric acid. As a versatile organic compound, it serves as a key ingredient in food, beverages, and chemical processes due to its acidic and flavor-enhancing properties. Unlike L-malic acid (the biologically active form), DL-malic acid is cheaper to produce and equally effective for industrial applications. Its dual functionality as an acidulant and preservative makes it indispensable in sectors ranging from confectionery to detergents.
Physical and Chemical Properties
DL-Malic Acid exhibits a strong acidic taste (pH ~2.2 in solution) and is highly soluble in polar solvents. Its crystalline structure and hygroscopic nature require careful storage to prevent clumping. The compound decomposes at high temperatures, releasing carbon dioxide and water. Chemically, it acts as a chelating agent, binding metal ions in industrial cleaners. Its two carboxyl groups enable participation in esterification and polymerization reactions, useful for producing biodegradable plastics and resins.
Main Applications
In the food industry, DL-Malic Acid is a popular substitute for citric acid in low-calorie beverages and candies, providing a prolonged sour flavor. It also stabilizes colors and pH in canned goods. Pharmaceuticals utilize it as an excipient in effervescent tablets and syrups. Industrially, it removes rust from metals and scales in boilers. Cosmetic formulations leverage its mild exfoliating properties in skincare products. Recent research explores its potential in green chemistry for sustainable material synthesis.
Safety and Storage
While generally recognized as safe (GRAS) by the FDA, DL-Malic Acid can cause mild irritation upon direct contact. Workplaces should ensure adequate ventilation and provide gloves/goggles. Spills should be neutralized with alkaline solutions. Storage recommendations include airtight containers with desiccants to prevent moisture absorption. Bulk shipments must avoid temperature extremes to maintain stability. Shelf life typically exceeds two years under optimal conditions.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO 9001 or FSSC 22000 certification for food-grade malic acid. Specifications must detail purity (≥99%), heavy metal limits (<10 ppm), and residual solvents. Packaging options range from 25 kg woven bags to 1-ton supersacks. Price negotiations benefit from long-term contracts, especially for quantities exceeding 10 metric tons. Regional suppliers in China and Europe often offer competitive rates. Sample testing for consistency in particle size and solubility is advised before large purchases.
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