CAS NO: 738-70-5
Specification: BP/USP
| Product Name | Trimethoprim |
| Quality Standard | BP/USP/EP |
| Testing Items | Critrion |
| Appearance | White or yellowish white powder |
| Solubility | Free soluble in water, slightly soluble in alcohol |
| Identification | Melting Point 199-203℃ Specific Absorbance 287nm Max 240-250 IR Meets reference Chemical Reaction Green fluorescence at 365nm |
| Appearance of solution | Not more intensely colored than reference solution BY7 |
| Related substance | Impurity F ≤ 0.1% Any single impurity ≤0.1% Total Impurties ≤0.2% |
| Heavy metals | ≤20ppm |
| Residual methanol | ≤3000ppm |
| Residual DMSO | ≤5000ppm |
| Residue acetic acid | ≤5000ppm |
| Impurity K(aniline)by GC | ≤5ppm |
| Loss on drying | ≤0.5% |
| Sulphated ash | ≤0.1% |
| Assay | 98.5%-101.0% |