Paricalcitol Impurity 28 CAS 139356-36-8

Description

Compared with other compounds in its class, the molecular weight of 428.75 g/mol gives Paricalcitol Impurity 28 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

Paricalcitol Impurity 28 (CAS 139356-36-8) is a certified pharmaceutical impurity reference standard with the molecular formula C22H44O4Si2 and a molecular weight of 428.75 g/mol.

The molecular framework of Paricalcitol Impurity 28 (C22H44O4Si2) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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

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