Objective: This study aimed to develop a highly sensitive method for the determination of the genotoxic impurity 2-amino pyridine in Tenoxicam, employing hyphenated techniques.

Methods: The determination of 2-amino pyridine was carried out using a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method in Selected Ion Monitoring mode (SIM). A LiChrospher RP-18 (100×4.6 mm) 5.0 µm column was utilized for the separation. A gradient elution technique was employed with acetonitrile (mobile phase A) and 0.01M ammonium acetate buffer (mobile phase B) in varying ratios. The gradient program (T/%B) was set as 0/5, 2.50/15, 5.00/30, 10.00/50, 15.00/95, 20.00/95. The developed method was validated according to the International Conference on Harmonization guidelines.

Results: The limits of detection (LOD) and quantification (LOQ) for 2-amino pyridine were found to be 0.09 ppm and 0.3 ppm, respectively. The method demonstrated accuracy within the range of 89.1% to 106.6% for the analyte. The method's linearity was confirmed through a six-point calibration graph spanning 6 ppm to 75 ppm, corresponding to a concentration of 20 mg/ml of Tenoxicam.

Conclusion: Developed hyphenated LC-MS/MS method presented in this study offers a highly sensitive and accurate means for the determination of the genotoxic impurity 2-amino pyridine in Tenoxicam. With validated LOD and LOQ values, as well as demonstrated accuracy, this method proves to be a robust quality control tool suitable for the quantitation of 2-amino pyridine at very low concentrations in the pharmaceutical compound Tenoxicam.