| ≥1 piece |
White or slightly yellow crystals or Powder
| Item | Standard | Result |
| Description | White or slightly yellow crystals or Powder | Conforms |
| Identification | Positive | Conforms |
| Assay % | 99.0-100.5% | 99.48% |
| Specific Rotation | -16.5°- 18.0° | -17.55° |
| Heavy metals (ppm) | 10 max | Conforms |
| Lead (ppm) | 5 max | Conforms |
| Residue on ignition % | 0.3 max | Conforms |
| Loss on drying % | 0.4 max | 0.26 |
| Oxalate | Passes test | Conforms |
| mercury | 1 max | Conforms |
| Arsenic (ppm) | 3 max. | Conforms |
| CAS No.: 89-65-6 | Type: Antioxidants | Brand Name: RUI |