| Off-white crystalline powder | 98.5% |
| Item | Specification | Result |
| Appearance | Slightly yellow or off-white powder | Conforms |
| Assay(on dried basis), % | 98.5～101.0 | 99.2 |
| Identification　 | Conforms | Conforms |
| Solubility | Very slightly soluble in water Soluble in alkali-OH Soln | Conforms |
| Melting point, ℃ | 140～145 | 144 |
| Water, % | ≤10 | 8.2 |
| Heavy metals | ≤10ppm | Conforms |
| in 0.25% water) | 2.6～3.0 | 2.7 |
| Vitamin B6,% | ≤0.05 | ND |
| Conclusion | Qualified | |
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