Alfacalcidol EP Impurity B CAS 63181-13-5

Purity >80%In StockPharmacopoeial Impurity Standards
CAS No.63181-13-5
Molecular FormulaC27H44O2
Molecular Weight400.64 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Alfacalcidol EP Impurity B CAS 63181-13-5 chemical structure

Description

As a certified reference material (CRM), Alfacalcidol EP Impurity B 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.

CATO supplies Alfacalcidol EP Impurity B (CAS 63181-13-5), a pharmacopoeial impurity reference standard (molecular formula C27H44O2, MW 400.64 g/mol) used for the identification and quantification of trace impurities in APIs.

Based on its molecular formula C27H44O2, Alfacalcidol EP Impurity B 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.

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.

Physical & Chemical Properties

Molecular FormulaC27H44O2
Molecular Weight400.64 g/mol
AppearanceOff-white to pale yellow crystalline powder
Purity>80%
StorageStore at room temperature, protect from light
Solubility (reference)Soluble in chloroform, dichloromethane, ethyl acetate, DMSO
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)6.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1975

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