Overview
Food-grade lactic acid is a naturally occurring organic acid produced through the fermentation of carbohydrates by lactic acid bacteria. It is widely used in the food and beverage industry due to its mild acidic taste and preservative properties. The compound is biodegradable and non-toxic, making it a preferred choice for food applications. Lactic acid exists in two optical isomers, L-lactic acid and D-lactic acid, with L-lactic acid being the most commonly used in food products. The food-grade variant is purified to meet stringent safety standards, ensuring it is free from harmful contaminants.
Physical and Chemical Properties
Food-grade lactic acid is a colorless to pale yellow syrupy liquid with a density of 1.209 g/cm³ at 25°C. It has a melting point of 16.8°C and a boiling point of 122°C at 15 mmHg. The acid is highly soluble in water, ethanol, and glycerol, which facilitates its incorporation into various food and beverage formulations. Lactic acid is a weak acid with a pKa of 3.86, making it effective for pH adjustment in food products. Its mild acidic taste and ability to enhance flavors contribute to its widespread use in dairy products, baked goods, and beverages.
Main Applications
Food-grade lactic acid serves multiple functions in the food industry. It is commonly used as a preservative to extend the shelf life of products by inhibiting the growth of spoilage microorganisms. In dairy products like yogurt and cheese, lactic acid is a key component in the fermentation process, contributing to flavor and texture. The acid is also employed as a pH regulator in beverages and canned foods to ensure product stability. Additionally, lactic acid enhances the flavor of sourdough bread, candies, and other confectioneries. Its versatility and safety profile make it indispensable in modern food processing.
Safety and Storage
Food-grade lactic acid is generally recognized as safe (GRAS) by the U.S. Food and Drug Administration (FDA). However, it is advisable to handle the acid with care, avoiding direct contact with eyes and skin, as it can cause irritation. Proper storage in a cool, dry place away from direct sunlight is essential to maintain its quality. Containers should be tightly sealed to prevent moisture absorption and contamination. In case of spills, the affected area should be rinsed thoroughly with water. Suppliers must provide certification to ensure the product meets food-grade purity standards.
B2B Procurement Guide
When procuring food-grade lactic acid, B2B buyers should prioritize suppliers who provide detailed documentation, including certificates of analysis (CoA) and compliance with international food safety standards such as FDA and EFSA. Bulk purchases may offer cost advantages, but buyers should verify storage capabilities to prevent degradation. It is also essential to assess the supplier's reliability and track record in delivering consistent quality. Buyers should request samples for testing before committing to large orders. Pricing varies based on purity and quantity, with discounts often available for long-term contracts.
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