Alfacalcidol Impurity 28 CAS CATO-C4X-139328
| CAS No. | CATO-C4X-139328 |
| Molecular Formula | C27H44O2 |
| Molecular Weight | 400.64 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C27H44O2, Alfacalcidol Impurity 28 contains a steroid core, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 400.64 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Alfacalcidol Impurity 28 (CAS CATO-C4X-139328) is a certified pharmaceutical impurity reference standard with the molecular formula C27H44O2 and a molecular weight of 400.64 g/mol.
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 certified reference material (CRM), Alfacalcidol Impurity 28 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 | C27H44O2 |
| Molecular Weight | 400.64 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
Related Alfacalcidol Standards
- Alfacalcidol (CAS 41294-56-8)
- Alfacalcidol EP Impurity A (CAS 65445-14-9)
- Alfacalcidol impurity 13 (CAS 58028-00-5)
- Alfacalcidol impurity 14 (CAS CATO-C4X-139314)
- Alfacalcidol impurity 15 (CAS 1279049-53-4)
- Alfacalcidol EP Impurity B (CAS 63181-13-5)
- Alfacalcidol Impurity 20 (CAS CATO-C4X-139320)
- Alfacalcidol Impurity 21 (CAS CATO-C4X-139321)
Recommended Standards
- Alfacalcidol Impurity 22 (CAS CATO-C4X-139322)
- Alfacalcidol Impurity 31 (CAS CATO-C4X-139331)
- Alfacalcidol Impurity 7 (CAS CATO-C4X-13937)
- Alfacalcidol impurity 9 (CAS CATO-C4X-13939)
- (S,S)-Formoterol EP Impurity H (CAS 67346-67-2)
- Nicergoline EP Impurity A (CAS 38536-28-6)
- Osimertinib Impurity 15 (CAS 1896788-06-9)
- 4-(((2h-Indazol-7-yl)amino)methyl)phenol (CAS 1158058-16-2)
- 1-(4-Amino-2,6-difluorophenyl)piperidin-4-ol (CAS 1184129-47-2)
- 4-(4-aminopiperidin-1-yl)butanoic acid dihydrochloride (CAS 1461707-77-6)
- (S)-6,7-Dihydroxy-1,1-dimethyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid (CAS 796881-85-1)
- (S,R)-5-CF3-Pyox-In (CAS 2412578-71-1)
- β-D-Ribofuranose, 2,3,5-triacetate (CAS 65024-85-3)
- Insulin Degludec Impurity 26 (CAS CATO-C4X-215726)
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