A green UPLC method for the simultaneous determination of tenofovir and amoxicillin in biological fluids and dosage forms

This paper elucidates the process of developing and validating the UPLC technique, aiming to enable the concurrent measurement of tenofovir and amoxicillin. This UPLC method is accurate and sensitive. The experimental setup involved utilizing a Kinetex 1.7μ C18 100A (2.1-mm × 50-mm) column maintained at a temperature of 30°C. The mobile phase employed a combination of methanol and phosphate buffer (0.1% orthophosphoric acid in water, pH 3.5) in a ratio of 30:70 (v/v). The flow rate was set at 0.2mL/min, and the detection wavelength for analysis was 230nm. All these conditions resulted in optimum chromatographic separation. This developed method of UPLC took less than 4 minutes to separate this mixture. The detection limits for two medications were determined to be 0.45μg/mL for tenofovir and 0.26μg/mL for amoxicillin. The calibration plots of both substances exhibited satisfactory linearity within the concentration range of 1.0 - 2.0 μg/mL. Remarkably, the method demonstrated excellent performance with high percentage recoveries ranging from 96.8% to 102.92% and low percentage relative standard deviation (%RSD) values below 2%. Consequently, the proposed methodology proved to be highly effective for detecting the targeted drugs in their respective dosage forms.