Product information
Product name: Gallic Acid
CAS No.: 149-91-7
Synonym: 3,4,5-Trihydroxybenzoic acid
Molecular Formula: C7H6O5
Molecular Weight: 170.12
SMILES: O=C(O)c1cc(O)c(O)c(O)c1
Typical Physical & Chemical Properties
| Parameter | Typical Value |
|---|---|
| Melting Point | 251 ~ 253 ℃ (decomposition) |
| Density | 1.694 g/cm³ |
| Odor | Odorless |
| Solubility | Slightly soluble in cold water; soluble in hot water, ethanol, methanol, acetone; insoluble in benzene, chloroform, petroleum ether |
| pH (saturated aqueous solution) | ~2.8 ~ 3.5 |
| Stability | Hygroscopic; prone to discoloration under light; avoid strong oxidants & strong alkalis |
Quality Specifications
| Item | Industrial Grade | Food / Pharma Grade | Test Method |
|---|---|---|---|
| Appearance | White to off-white crystalline powder | White fine crystalline powder | Visual Inspection |
| Assay (HPLC) | ≥99.0 % | ≥99.5 % | High Performance Liquid Chromatography |
| Loss on Drying | ≤10.0 % | ≤8.0 % | Gravimetry (105 ℃) |
| Residue on Ignition | ≤0.10 % | ≤0.08 % | Gravimetry |
| Heavy Metals (as Pb) | ≤10 ppm | ≤5 ppm | AAS |
| Arsenic (As) | ≤3 ppm | ≤2 ppm | Spectrophotometry |
| Chloride (Cl⁻) | ≤0.005 % | ≤0.003 % | Turbidimetry |
| Sulphate (SO42−) | ≤0.005 % | ≤0.003 % | Turbidimetry |
| Tannic Acid | Complies | ≤0.001 % | Qualitative Test |
Product Characteristics
- Natural polyphenol compound with strong antioxidant activity.
- Excellent metal chelating performance against iron, copper and other metal ions.
- Typical phenolic acid, easy to undergo esterification, oxidation and condensation reactions.- Low toxicity, widely acceptable for food additive, cosmetic and pharmaceutical raw materials.
Applications
- Raw material for synthesis of propyl gallate, octyl gallate and other food antioxidants.
- Antioxidant, stabilizer and metal ion sequestrant in cosmetics & personal care formulations.
- Pharmaceutical intermediate, astringent and antibacterial raw material.
- Analytical reagent for detection of iron, cerium and other metal cations.- Water treatment additive, dye & printing auxiliary, photographic chemical.
Handling & Storage
Store in tightly sealed polyethylene-lined kraft paper drums, cool, dry and dark warehouse.
Protect from light, moisture and high temperature.
Keep separated from strong oxidizing agents, strong bases.
Avoid dust inhalation; wear dust mask and protective gloves during operation.
Shelf life: 24 months under recommended storage conditions.
Packing
25kg in fiber drum or paper bag
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