L-lactic acid is a chemical substance with the molecular formula C3H6O3. It is an optical isomer of lactic acid with a boiling point of 125°C. L-lactic acid is an organic acid refined through biological fermentation using corn starch as the raw material. It is a colorless, clear, viscous liquid with an acidic reaction in aqueous solution. It can mix freely with water, ethanol, or ether but is insoluble in chloroform. So, is L-lactic acid safe? Due to its levorotatory characteristics, it has excellent biocompatibility, can integrate with mammals, directly participate in human metabolism, and has no side effects. Therefore, it is widely used in food, pharmaceuticals, and other fields, making L-lactic acid very safe.
Uses of L-lactic acid
Food industry: Mainly used in the food processing industry for candies, beverages (such as beer, wine, and lactic acid beverages), as an acidulant and taste regulator. It is known as an absolutely safe food additive. It can also be used in cool beverages, and the processing and preservation of vegetables;
Pharmaceutical industry: L-lactic acid is an important pharmaceutical intermediate, used to produce erythromycin Ringer's solution, calcium L-lactate, sodium L-lactate, zinc L-lactate, ferrous L-lactate, and also as a sterilant and disinfectant in operating rooms, wards, and laboratories;
Cosmetics: Can be used as a moisturizer, humectant, skin renewal agent, pH regulator, acne treatment, and toothpaste cleaner;
Pesticide industry: L-lactic acid has high biological activity and is non-toxic and harmless to crops and soil. It can be used to produce new environmentally friendly pesticides, which have been extensively promoted in developed countries like Japan and the United States;
Tobacco industry: Adding an appropriate amount of L-lactic acid can improve the quality of tobacco and maintain its moisture. Leather manufacturing: It can make leather soft and delicate, thus improving its quality; Textile industry: It can be used to treat fibers, making them easy to dye, adding gloss, and soft touch;
Other industries: Besides the above uses, L-lactic acid can also be used to produce biodegradable plastics — polylactic acid, and green environmentally friendly solvents like L-lactic acid methyl ester and L-lactic acid ethyl ester. Heat-resistant, food-grade L-lactic acid quality standards (refer to the USP23/25 and EP2002 standards).
Properties and Stability of L-lactic acid
L-lactic acid is an optical isomer of lactic acid with the chemical formula C3H6O3, which is an organic acid.
It is a colorless, clear, viscous liquid with an acidic reaction in aqueous solution.
L-lactic acid can mix freely with water, ethanol, or ether, but is insoluble in chloroform.
It can volatilize with superheated steam, decomposing under normal pressure distillation. When concentrated to 50%, some of it converts to lactic acid anhydride, so 85%-90% lactic acid products typically contain 10%-15% lactyl anhydride. It is highly hygroscopic.
Present in tobacco leaves and smoke.
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