Paricalcitol Impurity 13 CAS CATO-C4X-138713

Purity 97%+In StockPharmacopoeial Impurity Standards
CAS No.CATO-C4X-138713
Molecular FormulaC24H37O2PSi
Molecular Weight416.61 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Paricalcitol Impurity 13 CAS CATO-C4X-138713 chemical structure

Description

Paricalcitol Impurity 13 (CAS CATO-C4X-138713) is a certified pharmaceutical impurity reference standard with the molecular formula C24H37O2PSi and a molecular weight of 416.61 g/mol.

Paricalcitol Impurity 13 (C24H37O2PSi) contains a steroid core, organophosphorus functionality, a hydroxyl group, an ether linkage. Its high carbon-to-hydrogen ratio confers good lipid solubility, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).

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 FormulaC24H37O2PSi
Molecular Weight416.61 g/mol
AppearanceOff-white to pale yellow crystalline powder
Purity97%+
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)6.5
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present

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