Kojic acid Chemical name: 5-hydroxy-2-(hydroxymethyl)-4h-pyran-4-one Inci name: kojic acid Cas no. [501-30-4] Molecular weight: 142.11 Chemical formula: c6h6o4 Kojic acid is a kind of specialized inhibitor for melanin. It can prevent the tyrosinase activity through synthesizing with copper ion in the cells after it enters skin cells. Kojic acid and its derivative has better inhibitory effect on tyrosinase than any other skin whitening agents. It is assigned into various kinds of cosmetics for curing freckles, spots on the skin of older people, pigmentation and acne. It eliminates free radicals and strengthens cell activity. Specification: Appearance property almost white crystal or crystalline powder Purity (%) 99.0 min Melting point (deg.C) 152-155 Loss on drying (%) 0.5 max Ignition residue (%) 0.1 max Chloride (%) 0.005 max Heavy metals (%) 0.001 max Arsenic (%) 0.0001 max Iron (%) 0.001 max Microbiological test: bacteria: 3000cfu/g max Colon bacillus: negative Fungi: 50 cfu/g max