Selective Ion-pair Potentiometric Sensor for the Determination of Ondansetron Hydrochloride in Different Matrixes

A facile, novel, and, sensitive potentiometric sensor has been developed to quantitatively determine ondansetron hydrochloride in bulk and pharmaceutical dosage forms. The sensor comprised an ion-pair between ondansetron hydrochloride and ammonium reineckate reagent, as an electrochemically active substance, on a polyvinyl chloride (PVC) matrix. Synthesis optimization was carried out by firstly altering the proportion of the ion-pair, PVC, and the plasticizer and subsequently, many plasticizer types have been investigated to realize the best performance. The optimum electrode consisted of 48.5 % polyvinyl chloride, 48.5 % dibutyl phthalate, and 3 % ionic pair complex and has shown a respectful Nernstian relationship within a linear range of (5.06x10(-6)-2592.92x10(-6) M) and a slope of 57.277 mVxdecade(-1) in response to the drug. The electrode worked perfectly in a pH range of (1.9-6.1) where the analyte kept dissolved. Interestingly, the electrode demonstrated a fast response time of 30 sec, a lower limit of detection of 4.83x10(-6) M, and an electrode lifetime of up to 30 days. The prepared electrode was applied successfully to determine the drug in its pharmaceutical dosage forms and the method validity was established. Hence, the electrode might be applied easily for the routine analysis of ondansetron hydrochloride in both scientific labs and drug industry.