Sodium Fusidate EP Impurity L CAS 74048-41-2
| CAS No. | 74048-41-2 |
| Molecular Formula | C31H46O5 |
| Molecular Weight | 498.69 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Sodium Fusidate EP Impurity L (CAS 74048-41-2) is a certified pharmaceutical impurity reference standard with the molecular formula C31H46O5 and a molecular weight of 498.69 g/mol.
The molecular framework of Sodium Fusidate EP Impurity L (C31H46O5) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage, a polycyclic aromatic system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C31H46O5 |
| Molecular Weight | 498.69 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1978 |
Related Sodium Standards
- Sodium Fusidate Impurity 21 (CAS CATO-C4X-119721)
- Sodium Fusidate EP Impurity M (CAS 1013937-16-0)
- Sodium Fusidate Impurity 20 (CAS CATO-C4X-119720)
- Sodium Fusidate EP Impurity G (CAS 4680-37-9)
- Sodium Fusidate EP Impurity H (CAS 16711-91-4)
- Sodium Fusidate EP Impurity O (CAS CATO-C4X-119716)
- Sodium Fusidate EP Impurity I (CAS 5951-83-7)
- Sodium Fusidate Impurity 22 (CAS CATO-C4X-119722)
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Why CATO?
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