CAS 501-30-4 corresponds to Kojic acid, with the chemical name 5-hydroxy-2- (hydroxymethyl) -4H-pyran-4-one. It is a natural derivative of gamma pyranone produced by fermentation of Aspergillus, mainly used as a whitening agent, antioxidant, and food color and freshness preservation agent.

Core Basic Information
-Chinese name: Kojic acid (alias: Kojic acid, Kojic acid)
-English name: Kojic acid
-Molecular formula: C ₆ H ₆ O ₄
-Molecular weight: 142.11
-Structural features: Pyranone ring structure containing phenolic hydroxyl, alcohol hydroxyl, ketone, and carbon carbon double bonds
-EINECS number: 207-922-4
-MDL Number: MFCD00006580

Physicochemical properties
-Appearance: Colorless prismatic crystals or white/off white needle shaped crystalline powder
-Melting point: 152-155 ℃
-Solubility: Easily soluble in water, ethanol, and acetone; Slightly soluble in ether, ethyl acetate, chloroform, and pyridine; Insoluble in benzene
-Acidity and alkalinity: weakly acidic (pKa ≈ 7.9), non strong acid
-Stability: Sensitive to light, heat, and metal ions, prone to oxidation and discoloration; Incompatible with strong oxidants
-Safety: Listed as a Class 3 carcinogen by WHO/IARC (insufficient evidence); The EU SCCS assessment considers cosmetics to be safe at concentrations of ≤ 0.7% and unsafe at concentrations above 1%.

main purpose
1. Cosmetics: Inhibit tyrosinase activity, block melanin production, used for whitening and spot removal products (usually added at a dosage of 0.5-2.0%)
2. Food industry: color protectants, preservatives, preservatives (preventing shrimp and crab from turning black, meat color protectants, inhibiting nitrosamine formation)
3. Medicine/Research: Organic synthesis intermediates, metal ion chelating agents, antioxidant research reagents

Precautions
-High concentrations may cause skin irritant contact dermatitis or vitiligo
-Storage should be sealed, away from light, dry, and in a cool place (recommended<30 ℃)
-Cannot be mixed with strong oxidants

Products :

Kojic acid powder CAS 501-30-4
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