| ITEMS | SPECIFICATIONS | RESULTS |
| Description | White needle crystals or crystalline powder | White crystalline powder |
| Assay (HPLC, %) | ≥99.5 | 99.95% |
| Loss on Drying (%) | ≤0.5 | 0.05 |
| Residue on Ignition (%) | ≤0.5 | 0.05 |
| Specific Rotation [ α ]D20 | +175.0° ~ +185.0° | +179. 7° |
| Clarity of water solution (1%) | Transparent, colorless, none suspended matters. | Conformed |
| pH | 5.0~7.0 | 6.80 |
| Melting point (℃) | 202.0~ 210.0 | 203.4-205.3 |
| Hydroquinone | Negative | Negative |
| Lead (mg/kg) | ≤10 | ＜1.5 |
| Arsenic (mg/kg) | ≤2 | 0.040 |
| Mercury (mg/kg) | ≤1 | 0.0039 |
| Methanol (mg/kg) | ≤2000 | ＜10 |
| Aerobic Bacterial Count (cfu/g) | ≤1000 | Pass |
| Molds and Yeast Count (cfu/g) | ≤100 | ＜10 |
| Fecal Colifonns | Negative/g | Pass |
| Pseudomonas Aeruginosa | Negative/g | Pass |
| Staphylococcus Aureus | Negative/g | Pass |
| Conclusion: Meet the requirements of the Manufacturer's Standard. | ||
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