Overview
D-Malic Acid is one of two stereoisomers of malic acid, distinguished by its (R)-configuration at the chiral center. While L-malic acid occurs naturally in fruits, D-malic acid is less common in nature but equally important in industrial applications. This organic dicarboxylic acid plays crucial roles in biochemical processes and industrial formulations. The compound is synthesized through various methods including chemical synthesis and microbial fermentation. Its chiral nature makes it valuable for asymmetric synthesis in pharmaceuticals. Unlike its L-isomer, D-malic acid is not metabolized through the Krebs cycle, giving it unique applications in specialty chemical formulations.
Physical and Chemical Properties
D-Malic Acid appears as a white, odorless crystalline powder with a tart taste. It exhibits good solubility in polar solvents, particularly water (558 g/L at 20°C) and ethanol. The compound's optical rotation is typically +2.4° to +2.8° (c=1 in H2O), distinguishing it from its L-isomer. Chemically, it demonstrates typical dicarboxylic acid behavior, forming salts and esters. The presence of both carboxyl and hydroxyl groups makes it reactive in various chemical transformations. Its pKa values are approximately 3.4 and 5.1, allowing it to function as a buffer in certain pH ranges. The compound is stable under normal conditions but may decompose at temperatures above 150°C.
Main Applications
In the food industry, D-Malic Acid serves as an acidity regulator and flavor enhancer, particularly in sugar-free products and tart candies. Its slower metabolism compared to L-malic acid makes it suitable for extended-release flavor applications. The pharmaceutical industry utilizes D-Malic Acid as a chiral building block for drug synthesis and as an excipient in certain formulations. In industrial applications, it functions as a metal chelator in cleaning products and a pH adjuster in cosmetic formulations. Research applications include its use as a standard in chiral chromatography and studies of enzymatic stereospecificity.
Safety and Storage
D-Malic Acid is generally regarded as safe when handled properly, but concentrated forms may cause mild irritation to eyes, skin, and respiratory system. Appropriate personal protective equipment including gloves and safety goggles is recommended during handling. For storage, maintain in tightly sealed containers at room temperature (15-25°C) with low humidity. The material is hygroscopic and may absorb moisture if exposed to humid conditions. Shelf life is typically 2-3 years when stored properly. In case of spills, clean with water and avoid creating dust clouds. For large quantities, consult local regulations for proper disposal methods.
B2B Procurement Guide
When sourcing D-Malic Acid for commercial use, buyers should specify required purity (typically 98-99.5%), optical purity (>98% ee), and relevant certifications (food grade, USP, etc.). Bulk quantities (500kg+) often offer better pricing, with discounts available for long-term contracts. Key procurement considerations include verifying supplier quality control processes, especially for chiral purity testing. Request certificates of analysis and consider third-party testing for critical applications. Logistics planning should account for the compound's hygroscopic nature - moisture-proof packaging is essential. For pharmaceutical applications, ensure suppliers have appropriate cGMP compliance documentation.
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