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Naproxen Sodium
| ITEMS | LIMIT |
| Appearance | White to almost white crystalline powder |
| Infrared absorption | The infrared absorption spectrum is concordant with the reference spectrun |
| Utraviolel Absorption | Absorptivities at 272nm,calculated on the dried base,do not differ by morethan 3% |
| Specific rotation | -15.3 o ~ -17.0 o |
| Loss on drying | ≤1.0% |
| Heavy metals | ≤0.002% |
| Free Naproxen | ≤1.0% |
| ImpurityD(in house) | ≤0.10% |
| Impurity E(in-house,impurity C in EP) | ≤0.10% |
| Any other impurlty | ≤0.10% |
| Tolucne | ≤50ppm |
| Methanol | ≤50ppm |
| Ethanol | ≤100ppm |
| Assay(on the dried basis)it contains C14H13NaO3 | 98.5%~101.5% |
| Note:1LOD:Impurity D;0.002%,Impurity E:0.001%,Any other impurity 0.002% | |
| LOQ: Impurity D;0.01%,Impurity E:0.005%,Any other impurity 0.01% | |
| 2LOD:Toluene:0.05ppm,Methanol:12ppm,Ethanol:8ppm | |
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