Dexamethasone Impurity 93 CAS 83509-38-0

Description

The occurrence of Dexamethasone Impurity 93 is closely related to a steroid core, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.

CATO supplies Dexamethasone Impurity 93 (CAS 83509-38-0), a pharmacopoeial impurity reference standard (molecular formula C21H28O2, MW 312.45 g/mol) used for the identification and quantification of trace impurities in APIs.

The molecular framework of Dexamethasone Impurity 93 (C21H28O2) is characterized by a steroid core, 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 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

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