L-Aspartic Acid Sodium Salt Monohydrate (CAS: 323194-76-9) Product Introduction
L-Aspartic Acid Sodium Salt Monohydrate, with the CAS number 323194-76-9, is a sodium salt hydrate derivative of L-aspartic acid, also known as Sodium L-aspartate monohydrate or (S)-2-Aminosuccinic acid monosodium salt monohydrate. Its molecular formula is C₄H₈NNaO₄·H₂O, and its molecular weight is 173.11 g/mol. As a naturally occurring amino acid derivative, it combines the physiological activity of L-aspartic acid with the improved solubility of the sodium salt form, making it widely used in food, pharmaceuticals, cosmetics, and biochemical research.
Physically, it appears as a white to off-white crystalline powder or granular solid. It has a melting point of approximately 270℃ (decomposition) and is highly soluble in water, forming a clear and stable aqueous solution, while it is slightly soluble in methanol and ethanol, and insoluble in non-polar solvents. It is optically active, with a specific rotation [α]²⁰/D of +24.0° to +28.0° (in water, c=5). The monohydrate form enhances its stability, but it is slightly hygroscopic, requiring proper moisture control during storage.
Chemically, it retains the amino and carboxyl functional groups of L-aspartic acid, with one carboxyl group neutralized to form a sodium salt, and one water molecule bound in its crystal structure. This modification significantly improves its water solubility and bioavailability compared to free L-aspartic acid. It is stable under neutral and weakly alkaline conditions but may decompose under strong acid or high-temperature environments, and it can participate in amidation, condensation, and other organic reactions.
Its core applications cover multiple fields. In the food industry, it serves as a flavor enhancer and nutritional additive, improving the umami taste of food products such as condiments, beverages, and processed meats, while supplementing essential amino acids. In the pharmaceutical industry, it is used as a raw material for preparing nutritional supplements and drugs for regulating physiological functions, such as liver protection and electrolyte balance. In cosmetics, it is added to skin care products to nourish the skin and enhance skin barrier function. Additionally, it is used as a biochemical reagent in molecular biology and cell culture experiments.
Safety-wise, it is generally recognized as safe (GRAS) for its intended uses, non-toxic and non-irritating under normal handling. It should be stored in a sealed, cool, dry, and dark environment at 2-8℃, away from strong oxidants, moisture, and high temperatures, to prevent moisture absorption and degradation. With its excellent solubility and physiological activity, it is an indispensable raw material in food, pharmaceutical, and daily chemical industries.
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