Alfacalcidol impurity 13 CAS 58028-00-5
| CAS No. | 58028-00-5 |
| Molecular Formula | C27H44O2 |
| Molecular Weight | 400.64 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Structurally, Alfacalcidol impurity 13 (C27H44O2) 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 400.64 g/mol, it falls into the moderately-high-molecular-weight range. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
Alfacalcidol impurity 13 (CAS 58028-00-5) 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 13 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 |
| CAS Registry Year (est.) | 1973 |
Related Alfacalcidol Standards
- Alfacalcidol (CAS 41294-56-8)
- Alfacalcidol EP Impurity A (CAS 65445-14-9)
- 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)
- Alfacalcidol Impurity 22 (CAS CATO-C4X-139322)
Recommended Standards
- 56792-59-7 27-hydroxy cholestenone (CAS 56792-59-7)
- Phenylgallium diiodide (CAS 90753-44-9)
- Gefarnate (CAS 51-77-4)
- Dehydro-δ-tocopherol (CAS 802909-72-4)
- Acetylcysteine impurity 69 (CAS CATO-C4X-153269)
- Revefenacin impurity 33 (CAS CATO-C4X-203133)
- Ornidazole Impurity 15 (CAS 105687-87-4)
- 2-Hydroxycyclohexan-1-one (CAS 533-60-8)
- Fluroxypyr (CAS 69377-81-7)
- Indeno[1,2-c]isochromene-5,11-dione (CAS 5651-60-5)
- Famciclovir Impurity 8 (CAS CATO-C4X-16428)
- methyl 2-(1-ethyl-3,5-dimethyl-1H-pyrazol-4-yl)acetate (CAS 1007502-22-8)
- 2-Amino-1-(1-methyl-1h-pyrazol-4-yl)ethan-1-one (CAS 1368588-90-2)
- Glucagon (1-29) (CAS 16941-32-5)
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