Nalidixic Acid is the first synthetic quinolone antibiotic, historically used to treat urinary tract infections. Its impurity profile includes structurally related analogs, residual solvents, and degradation products formed under stress conditions such as hydrolysis, oxidation, and photolysis. Degradation pathways typically involve oxidative breakdown of the quinolone nucleus, hydrolytic cleavage of the carboxylic acid group, and rearrangement of the naphthyridone ring system. These impurities may affect the drug’s potency, stability, and safety. All impurities are structurally characterized and qualified in accordance with ICH guidelines for toxicological assessment and analytical validation.
Pharmacopeial and non-pharmacopeial Nalidixic Acid impurity compounds are available in compliance with European Pharmacopoeia (EP) specifications. These standards support analytical method development, impurity profiling, and long-term stability studies. EP traceable materials are supplied with validated analytical data, including purity, structural confirmation, and spectral characterization.
Structurally related compounds and synthetic analogs associated with Nalidixic Acid are included for use in impurity identification, toxicological qualification, and regulatory submission. These related substances are used in forced degradation studies, genotoxicity assessments, and impurity threshold evaluations. They are essential for understanding the impurity profile and ensuring compliance with regulatory limits.
Nalidixic Acid impurity reference standards are provided with validated analytical data, including purity, NMR, MS, and full Certificates of Analysis. These standards are used in pharmaceutical research, method validation, and GMP-compliant quality control. EP/USP traceable entries are available upon request and are routinely re-tested to ensure consistency and reliability.
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