| Analysis Items | Specifications | Methods |
| Identifications |
- NMR
| 1H NMR confirms to product structure. |
- LC-MS
| LC-MS Conforms to molecular weight. |
- HPLC
| Retention time of the sample matches with the RS in HPLC purity test. |
| Physical Tests |
| Appearance | White fine powder | Visual |
| Melting point | 92~96℃ | GB 617 |
| Bulk density | 0.30-0.60g/mL | GB 5009.2 |
| Moisture content | ≤0.50% | GB 5009.3 |
| Residue on ignition | ≤0.50% | GB 5009.4 |
| Active Ingredients Tests |
| Pterostilbene Purity | ≥99.00% | HPLC |
| Max Single impurity | ≤0.10% | HPLC |
| Chemical Tests |
| Heavy Metals | ≤10.00ppm | GB 5009.74 |
| Pb<Lead> | ≤3.00ppm | GB 5009.12 |
| As<Inorganic arsenic> | ≤2.00ppm | GB 5009.11 |
| Cd<Cadmium> | ≤1.00ppm | GB 5009.15 |
| Hg<Total mercury> | ≤0.10ppm | GB 5009.17 |
| Residue of Ethanol | ≤5,000ppm | GB 5009.262 |
| Residue of Methylbenzene | ≤500ppm | GB 5009.262 |
| Microbiological Tests |
| Total Bacterial Counts | ≤1,000cfu/g | GB 4789.2 |
| Yeasts and Molds | ≤100cfu/g | GB 4789.15 |
| Coliform group | ≤1.0MPN/g | GB 4789.3 |
| Salmonella | Negative in 10g | GB 4789.4 |
| * Conclusion: Conform to above specifications. |
| * Packaging: 25kg per fiber drum. |
| * Storage Condition: Preserve in well-closed, tight containers with temperature below 10℃. |
| * Shelf Life: 3 years when properly stored. |
