Overview
L-Lactic Acid is the levorotatory enantiomer of lactic acid, naturally occurring in biological systems. It plays critical roles in metabolic processes and is industrially produced via microbial fermentation of carbohydrates. The compound holds GRAS (Generally Recognized As Safe) status in food applications. As a key platform chemical in the bioeconomy, L-Lactic Acid serves as a building block for polylactic acid (PLA) bioplastics. Its production has grown significantly due to demand for sustainable materials in packaging, textiles, and medical devices.
Physical and Chemical Properties
L-Lactic Acid exhibits distinct optical activity with a specific rotation of [α]D20 = -2.6° (c=2.5 in water). The concentrated form is hygroscopic and typically exists as a viscous liquid at room temperature, though it can crystallize when pure. Its acidity (pKa = 3.86) makes it effective for pH regulation. The compound undergoes typical carboxylic acid reactions including esterification and polymerization. Unlike its D-isomer, L-Lactic Acid is metabolically active in humans, participating in the Cori cycle. Thermal decomposition occurs above 150°C, producing acetaldehyde and carbon monoxide.
Main Applications
In food technology, L-Lactic Acid functions as an acidulant (E270) in dairy products, beverages, and preserved foods. It enhances flavor while inhibiting pathogenic bacteria. Pharmaceutical formulations utilize it in dialysis solutions, topical preparations, and as a chiral intermediate for drug synthesis. The cosmetic industry employs L-Lactic Acid in skin care products for its moisturizing and mild exfoliating properties. Industrially, over 40% of production supplies PLA polymer manufacturing for biodegradable packaging and medical implants. Emerging applications include green solvents and electrolyte additives.
Safety and Storage
While biodegradable and non-toxic at dilute concentrations, concentrated L-Lactic Acid requires careful handling. It causes chemical burns on prolonged skin contact and severe eye damage. Adequate ventilation is necessary when heating to prevent vapor inhalation. Storage tanks should be made of 316 stainless steel or polyethylene. The material is stable under recommended conditions but may discolor over time. Incompatible with strong oxidizers, bases, and reactive metals. Shelf life typically exceeds 24 months when properly stored.
B2B Procurement Guide
Industrial buyers should specify required purity levels: technical grade (80-88%), food grade (≥85%), or USP/Pharma grade (≥88%). Key quality parameters include optical purity (≥98% L-isomer), heavy metal content (<10 ppm), and residual sugars. Bulk shipments typically come in 25kg jerrycans, 200kg drums, or isotanks (20MT capacity). For pharmaceutical applications, audit suppliers for cGMP compliance. Consider regional producers in China, the EU, and North America to balance cost and logistics. Sample testing is recommended to verify consistency.
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