Epalrestat Impurity 14 CAS 31061-24-2

Purity >95%In StockPharmacopoeial Impurity Standards
CAS No.31061-24-2
Molecular FormulaC5H5NO4S
Molecular Weight175.16 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Epalrestat Impurity 14 CAS 31061-24-2 chemical structure

Description

Epalrestat Impurity 14 (CAS 31061-24-2) is a certified pharmaceutical impurity reference standard with the molecular formula C5H5NO4S and a molecular weight of 175.16 g/mol.

Owing to a carbohydrate-derived structure, an amide group, a sulfone group, Epalrestat Impurity 14 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 175.16 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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

Molecular FormulaC5H5NO4S
Molecular Weight175.16 g/mol
Purity>95%
StorageStore at 2-8°C, protect from light, keep sealed and dry
Solubility (reference)Soluble in methanol, ethanol, DMSO, water
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening
Degree of Unsaturation (DBE)4.0
UV AbsorptionUV-absorbing
CAS Registry Year (est.)1965
Nitrogen Atoms1
Sulfur Atoms1

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