Thioctic acid Impurity 40 CAS 91009-31-3

Description

Compared with other compounds in its class, the molecular weight of 236.39 g/mol gives Thioctic acid Impurity 40 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

CATO supplies Thioctic acid Impurity 40 (CAS 91009-31-3), a pharmacopoeial impurity reference standard (molecular formula C10H20O2S2, MW 236.39 g/mol) used for the identification and quantification of trace impurities in APIs.

Owing to a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, Thioctic acid Impurity 40 is typically white to off-white crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 236.39 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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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