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| ITEM | SPECIFICATION | 
| Characteristics | yellow crystalline powder | 
| Identification | A. Absorption at 353nm: 96.0%~104.0% | 
| Crystallinity | Meet the requirement | 
| PH Value | 4.5~7.0 | 
| Moisture | 6.0%~9.0% | 
| Assay | >=832 ug/mg | 
| Light-absorbing at 430nm | =<0.25%(anhydrous substance ) | 
| Light-absorbing at 490nm | =<0.20%(anhydrous substance ) | 
| U.S. Sieve No.20(850um) | All pass | 
| U.S. Sieve No.80(180um) | <5% max on the sieve | 
| 4-epioxytetracycline | =<0.5% | 
| Tetracycline Hcl | =<2.0% | 
| Eluting on the tail of the principal peak | =<2.0% | 
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