Indigo Carmine Impurity 2 CAS CATO-C4X-32602

Description

Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Indigo Carmine Impurity 2.

CATO supplies Indigo Carmine Impurity 2 (CAS CATO-C4X-32602), a pharmacopoeial impurity reference standard (molecular formula C16H6N4O10S2Na, MW 501.35 g/mol) used for the identification and quantification of trace impurities in APIs.

The molecular framework of Indigo Carmine Impurity 2 (C16H6N4O10S2Na) 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.

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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