Piroxicam EP Impurity D CAS 6639-62-9
| CAS No. | 6639-62-9 |
| Molecular Formula | C10H9NO5S |
| Molecular Weight | 255.25 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Piroxicam EP Impurity D (CAS 6639-62-9) is a certified pharmaceutical impurity reference standard with the molecular formula C10H9NO5S and a molecular weight of 255.25 g/mol.
Based on its molecular formula C10H9NO5S, Piroxicam EP Impurity D contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 255.25 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
As a certified reference material (CRM), Piroxicam EP Impurity D meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C10H9NO5S |
| Molecular Weight | 255.25 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Piroxicam Standards
- Piroxicam impurity 22 (CAS 88741-92-8)
- Piroxicam EP Impurity G (CAS 35511-14-9)
- Piroxicam EP Impurity C (CAS 24683-25-8)
- Piroxicam EP Impurity J (CAS 35511-15-0)
- Piroxicam EP Impurity E (CAS 24683-20-3)
- Piroxicam EP Impurity H (CAS 24683-21-4)
- Piroxicam Impurity 28 (CAS 112391-26-1)
- Piroxicam Impurity 26 (CAS 1942748-12-1)
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