
| Item | Specification |
| CAS no. | 657-27-2 |
| Test method | FCC / USP |
| Identification | Infrared absorption |
| Chromatographic purity | Meets the requirement |
| Appearance | White crystalline powder or crystals |
| Solubility | Soluble in water, very slightly soluble in alcohol |
| Assay | 98.5% – 101.5% |
| Specific rotation | +20.4° to +21.4° |
| pH value | 5.4 – 6.0 |
| Loss on drying | ≤0.4% |
| Residue on ignition | ≤0.1% |
| Sulfate | ≤0.03% |
| Chloride | 19.0 – 19.6 |
| Ammonium | ≤0.02% |
| Iron | ≤30 ppm |
| Heavy metals | ≤15 ppm |
| Lead | ≤3 ppm |
| Cadmium | ≤1 ppm |
| Mercury | ≤0.1 ppm |
| Arsenic | ≤1 ppm |
| Bulk density (untapped) | 0.45 – 0.49 g/ml |
| Tapped density | 0.63 – 0.66 g/ml |
| Particle size | NLT 100% through 20 mesh, NLT 75% through 60 mesh |
| Insoluble foreign matter | ≤5 mg/100 g |
| Individual impurities | ≤0.5% |
| Total impurities | ≤2.0% |
| Total plate count | ≤1000 cfu/g |
| Yeasts | ≤50 cfu/g |
| Molds | ≤50 cfu/g |
| E. coli | Negative/10g |
| Salmonella | Negative/25g |
| Storage condition | Preserve in tight containers at controlled room temperature |
| Shelf life | 2 years |



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