Antazoline-D5 (HCl Salt) is the deuterated impurity form of antazoline presenting a mass shift of +5 Da and forming the hydrochloride salt. As an isotopic impurity it requires characterization of isotopic enrichment, non-exchangeable versus exchangeable deuterium content, and potential back-exchange during sample preparation. Typical impurity profiling includes LC-MS for retention time separation, high resolution mass spectrometry to confirm mass accuracy, and NMR for deuterium incorporation. Stability studies assess acid or base induced H/D exchange and thermal decomposition. Specifications commonly cover isotopic purity, related substances by LC, water content, residual solvents, and assay to ensure reproducible quantitation in trace-level impurity analysis.
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