Overview
Ascorbic acid, universally recognized as Vitamin C, is an essential nutrient for humans and certain animals. Unlike most organisms, humans cannot synthesize ascorbic acid endogenously due to the lack of L-gulonolactone oxidase enzyme, making dietary intake or supplementation necessary. Discovered in 1912 and isolated in 1928, Vitamin C plays critical roles in biological processes including collagen formation, iron absorption, immune system support, and antioxidant protection against free radicals. Industrially, it's produced via a two-step fermentation process from glucose, dominated by Chinese manufacturers accounting for over 90% of global production.
Physical and Chemical Properties
As a white crystalline powder with a sharp acidic taste, ascorbic acid demonstrates high stability in dry form but rapidly oxidizes in solution, especially when exposed to light, heat, or metal ions. Its molecular structure features an enediol group that makes it a potent reducing agent. The compound shows remarkable solubility characteristics, dissolving readily in water (33g/100mL at 25°C) and moderately in alcohol. Its aqueous solutions are strongly acidic (pH 2-3 for 1% solution). Decomposition occurs at melting (190-192°C) with evolution of carbon dioxide, making boiling point measurement impractical.
Main Applications
In pharmaceuticals, ascorbic acid serves as both a nutrient supplement and an antioxidant preservative in formulations. Therapeutic doses range from 50mg to 1g daily, with higher doses used for specific conditions. The food industry utilizes it as a natural preservative (E300) in meats, beverages, and processed foods to prevent oxidation. Cosmetic applications leverage its antioxidant properties in anti-aging serums and brightening creams, typically in 5-15% concentrations. Industrial uses include water treatment as an oxygen scavenger and in photography as a developing agent. Emerging research explores its potential in cancer therapy adjunct treatment.
Safety and Storage
Classified as GRAS by FDA, ascorbic acid presents minimal toxicity with an LD50 of 11.9g/kg in rats. Chronic excessive intake may lead to kidney stones in susceptible individuals due to oxalate formation. Occupational exposure requires standard dust protection measures as powder may irritate respiratory tracts. Proper storage involves double-lined moisture-proof bags or drums in cool (15-25°C), dry conditions away from oxidizing agents. Shelf life typically exceeds 2 years when stored correctly. Stability testing shows <5% degradation annually at 25°C/60% RH. Solutions should be prepared fresh and protected from light using amber glass or opaque containers.
B2B Procurement Guide
Pharmaceutical buyers should specify USP/EP/JP monograph compliance with relevant heavy metal and residual solvent limits. Food-grade purchases require FCC compliance documentation. Key quality parameters include assay (99-100.5%), optical rotation (+20.5° to +21.5°), and residual moisture (<0.1%). Bulk procurement (typically 25kg bags) offers 10-15% cost savings versus retail packaging. Consider supplier audits for GMP compliance, especially for injectable-grade material. Emerging markets offer competitive pricing but may require additional quality verification. Just-in-time inventory is recommended due to gradual oxidative degradation over time.
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