Epalrestat Impurity 3 CAS 794510-29-5

Description

Compared with other compounds in its class, the molecular weight of 303.33 g/mol gives Epalrestat Impurity 3 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

CATO supplies Epalrestat Impurity 3 (CAS 794510-29-5), a pharmacopoeial impurity reference standard (molecular formula C15H13NO4S, MW 303.33 g/mol) used for the identification and quantification of trace impurities in APIs.

The molecular framework of Epalrestat Impurity 3 (C15H13NO4S) is characterized by a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.

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.

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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