Calcifediol EP Impurity C CAS 39932-44-0
| CAS No. | 39932-44-0 |
| Molecular Formula | C27H44O2 |
| Molecular Weight | 400.64 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 400.64 g/mol gives Calcifediol EP Impurity C distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Calcifediol EP Impurity C (CAS 39932-44-0) is a certified pharmaceutical impurity reference standard with the molecular formula C27H44O2 and a molecular weight of 400.64 g/mol.
Based on its molecular formula C27H44O2, Calcifediol EP Impurity C 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 high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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 | 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.) | 1968 |
Related Calcifediol Standards
- Calcifediol Impurity 32 (CAS 2963746-77-0)
- Calcifediol Impurity 1 (CAS 36149-00-5)
- Calcifediol Monohydrate EP Impurity A (CAS 61585-29-3)
- Calcifediol Impurity 11 (CAS CATO-C4X-189211)
- Calcifediol Impurity 12 (CAS 23357-18-8)
- Calcifediol EP Impurity B (CAS 22145-68-2)
- Calcifediol Impurity 14 (CAS CATO-C4X-189214)
- Calcifediol EP Impurity D (CAS 1233749-00-2)
Recommended Standards
- 7-β-Hydroxy-4-cholesten-3-one (CAS 25876-54-4)
- Dehydro-δ-tocopherol (CAS 802909-72-4)
- 5α-CHOLESTAN-3, 6-DIONE (CAS 2243-09-6)
- Gefarnate (CAS 51-77-4)
- Pemafibrate Impurity 27 (CAS CATO-C4X-290327)
- Gadobutrol Impurity 142 (CAS CATO-C4X-2120142)
- Venlafaxine Impurity 38 (CAS 93413-44-6)
- 3-(Ethoxycarbonyl)-1-(4-methoxyphenyl)-4,5-dihydro-1h-pyrazole-5-carboxylic acid (CAS 1264044-74-7)
- 3-(4-Bromophenoxy)-2-methylpropane-1-sulfonyl chloride (CAS 1341977-93-2)
- 2-[(4S)-4,5-Dihydro-4-(1-methylethyl)-2-oxazolyl]-N-[2-[(4S)-4,5-dihydro-4-phenyl-2-oxazolyl]phenyl]benzenamine (CAS 485394-26-1)
- Methotrexate EP Impurity C (CAS 2410-93-7)
- 2-Chloro-3-(4-chlorobenzenesulfonyl)-4-methyl-6-phenylpyridine (CAS 343372-75-8)
- 4-(Difluoromethyl)-3-fluoro-2-nitropyridine (CAS 1804755-09-6)
- Semaglutide impurity 60 (CAS CATO-C4X-222660)
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