Alfacalcidol Impurity 31 CAS CATO-C4X-139331
| CAS No. | CATO-C4X-139331 |
| Molecular Formula | C27H44O2 |
| Molecular Weight | 400.64 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
CATO supplies Alfacalcidol Impurity 31 (CAS CATO-C4X-139331), a pharmacopoeial impurity reference standard (molecular formula C27H44O2, MW 400.64 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a steroid core, a hydroxyl group, an ether linkage, Alfacalcidol Impurity 31 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 400.64 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 31 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 | ≥95% |
| 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 28 (CAS CATO-C4X-139328)
- Alfacalcidol Impurity 7 (CAS CATO-C4X-13937)
- Alfacalcidol Impurity 22 (CAS CATO-C4X-139322)
- Alfacalcidol impurity 9 (CAS CATO-C4X-13939)
- Tosufloxacin Impurity 8 (CAS CATO-C4X-19768)
- Paliperidone Impurity 57 (CAS CATO-C4X-172457)
- Deoxycholic acid Impurity 2 (CAS CATO-C4X-33592)
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Why CATO?
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- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com