Alfacalcidol impurity 17 CAS 2227309-93-3
| CAS No. | 2227309-93-3 |
| Molecular Formula | C27H44O3 |
| Molecular Weight | 416.64 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Alfacalcidol impurity 17 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.
Alfacalcidol impurity 17 (CAS 2227309-93-3) is a certified pharmaceutical impurity reference standard with the molecular formula C27H44O3 and a molecular weight of 416.64 g/mol.
Structurally, Alfacalcidol impurity 17 (C27H44O3) contains a steroid core, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 416.64 g/mol, it falls into the moderately-high-molecular-weight range. 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).
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.
Physical & Chemical Properties
| Molecular Formula | C27H44O3 |
| Molecular Weight | 416.64 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| 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 |
| CAS Registry Year (est.) | 1998 |
Related Alfacalcidol Standards
- Alfacalcidol impurity 10 (CAS 174176-73-9)
- Alfacalcidol Impurity 24 (CAS CATO-C4X-139324)
- Alfacalcidol Impurity 26 (CAS CATO-C4X-139326)
- Alfacalcidol-d7 (CAS 41294-56-8 (non-d))
- Alfacalcidol-d6 (CAS 1641940-94-4)
- Alfacalcidol (CAS 41294-56-8)
- Alfacalcidol EP Impurity A (CAS 65445-14-9)
- Alfacalcidol impurity 13 (CAS 58028-00-5)
Recommended Standards
- Paricalcitol Impurity 9 (CAS 216161-87-4)
- Calcitriol (CAS 32222-06-3)
- Paricalcitol Impurity 8 (CAS CATO-C4X-13878)
- Calcitriol Impurity 25 (CAS 134523-84-5)
- Duloxetine EP Impurity B (CAS 116539-55-0)
- Phloroglucinol EP Impurity A (CAS 87-66-1)
- Axitinib Impurity 74 (CAS CATO-C4X-107174)
- 4-[(2,5-dioxoimidazolidin-1-yl)methyl]benzoic acid (CAS 923200-35-5)
- 6-(3,4-Dimethoxyphenyl)nicotinic Acid (CAS 887976-58-1)
- 2-Chloro-1-(2,3-dimethyl-1H-indol-1-yl)propan-1-one (CAS 374914-83-7)
- (1r)-1-(Isoquinolin-5-yl)ethan-1-amine (CAS 1212802-19-1)
- 1-(4-chloro-2-fluoro-phenyl)hexahydropyrimidine-2,4-dione (CAS 1536232-37-7)
- 4-Amino-6-methylfuro[3,4-c]pyridin-3(1h)-one (CAS 108129-37-9)
- Semaglutide impurity 91 (CAS CATO-C4X-222691)
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