Alfacalcidol Impurity 23 CAS CATO-C4X-139323
| CAS No. | CATO-C4X-139323 |
| Molecular Formula | C33H58O2Si |
| Molecular Weight | 514.90 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
As a process- or degradation-related impurity, Alfacalcidol Impurity 23 (CAS CATO-C4X-139323, C33H58O2Si) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Owing to a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system, Alfacalcidol Impurity 23 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 514.90 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
As a certified reference material (CRM), Alfacalcidol Impurity 23 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 | C33H58O2Si |
| Molecular Weight | 514.90 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
Related Alfacalcidol Standards
- Alfacalcidol Impurity 27 (CAS CATO-C4X-139327)
- Alfacalcidol Impurity 6 (CAS CATO-C4X-13936)
- Alfacalcidol Impurity 32 (CAS CATO-C4X-139332)
- Alfacalcidol Impurity 25 (CAS CATO-C4X-139325)
- Alfacalcidol Impurity 33 (CAS CATO-C4X-139333)
- Alfacalcidol Impurity 30 (CAS CATO-C4X-139330)
- Alfacalcidol EP Impurity C (CAS 82266-85-1)
- Alfacalcidol Impurity N1 (CAS 71726-02-8)
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