Overview
Lactic acid is a naturally occurring alpha-hydroxy acid (AHA) that plays significant roles in both biological and industrial processes. First isolated in 1780 by Swedish chemist Carl Wilhelm Scheele from sour milk, it's now produced commercially through bacterial fermentation of carbohydrates or chemical synthesis. As a chiral compound, lactic acid exists in two enantiomeric forms: L-lactic acid (biologically active form) and D-lactic acid. Industrial applications commonly use either the L-form or racemic DL-mixture depending on requirements. The global lactic acid market continues to grow, driven by demand in food processing, biodegradable plastics (PLA), and personal care products.
Physical and Chemical Properties
Lactic acid is a colorless to slightly yellow viscous liquid with a characteristic mild acidic odor. It's hygroscopic and miscible with water in all proportions, forming a weakly acidic solution (pKa ≈ 3.86 at 25°C). The compound exhibits both alcohol and carboxylic acid functional groups, enabling diverse chemical reactions including esterification and polymerization. Industrial-grade lactic acid typically contains small amounts of lactoyl lactate (a condensation product). At elevated temperatures (>200°C), it decomposes to form acetaldehyde, carbon monoxide, and water. The L-form has specific optical rotation [α]D²⁰ = -2.6° (c=2.5 in water), distinguishing it from the D-enantiomer.
Main Applications
In food processing, lactic acid serves as an acidulant (E270), pH regulator, and antimicrobial agent in dairy products, baked goods, and beverages. The pharmaceutical industry utilizes it in topical formulations and as a starting material for lactate salts. Personal care products exploit its mild exfoliating properties in skin care formulations. The polymer industry accounts for growing demand, where lactic acid monomers polymerize to form polylactic acid (PLA) - a biodegradable thermoplastic used in packaging, textiles, and medical implants. Additional uses include metal cleaning/descaling, leather tanning, and as a mordant in textile dyeing processes.
Safety and Storage
As a mild organic acid, concentrated lactic acid solutions can cause skin and eye irritation. Proper PPE including gloves and goggles should be worn during handling. The substance is not considered highly flammable but may decompose at high temperatures to release irritating fumes. Storage requires corrosion-resistant containers (stainless steel or polyethylene) in well-ventilated areas away from oxidizing agents. Aqueous solutions are stable under normal conditions but may develop color over time. For long-term storage, temperature should not exceed 30°C (86°F) to prevent polymerization or ester formation.
B2B Procurement Guide
Industrial buyers should specify required concentration (typically 80-90%), optical purity (L-, D-, or DL-form), and compliance standards (USP, FCC, or technical grade). Food/pharmaceutical applications demand higher purity with documentation including certificates of analysis and GMP compliance. Bulk shipments commonly use intermediate bulk containers (IBCs) or tanker trucks for liquid forms. Price negotiations should consider volume discounts, with contracts often structured around quarterly pricing. Quality verification should include testing for residual sugars, heavy metals, and optical rotation where applicable. Emerging suppliers in Asia offer competitive pricing but may require additional quality assurance measures.
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