| Tests | Standards | ||
| 1 | Characteristics | A yellow crystalline powder hygroscopic | |
| 2 | identification | TLC | |
| Sulphuric acid yellow colour reaction | |||
| Choride’s reaction | |||
| 3 | Acidity | PH 2.0-3.0 | |
| 4 | Absorbance | 300-330 | |
| 5 | Specific optical rotation | -105º~ -`120º | |
| 6 | Heavy metals | Not more than 50PPM | |
| 7 | Light-absorbing impurities | Not more than 0.07 | |
| 8 | Related substances | Methacycline HCL | Not more than2.0% |
| 6-epi doxycycline | Not more than 2.0% | ||
| Other impurities | Not more than 0.5% | ||
| 9 | Ethanol | 4.3%-6.0% | |
| 10 | Sulphated ash | Not more than 0.4% | |
| 11 | Water | 1.4%-2.8% | |
| 12 | Assay (ankydrous ethanol free) | 88.0%-94.0% | |
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