Spectrophotometric Determination of Metochlopramide in itsPharmaceutical Preparations using Diazotization Coupling Reaction

Abstract

Simple and direct spectrophotometric method for quantitative estimation of metoclopramide hydrochloride (MTP) in pure and pharmaceutical dosage forms was adopted. The established method is based on a diazotization coupling reaction between diazotized MTP with new coupling reagent, 7-iodo-8-hydroxyquinoline5-sulphonic acid in alkaline medium. An intense red, water-soluble dye that is very stable and has a maximum absorption at 510 nm had been obtained. Regression analysis of Beer’s law plot showed good correlation in the concentration range 0.4-12μgml-1 with a molar absorbtivity of 1.91×105 L mol-1cm-1 and Sandell's sensitivity of 0.0018g.cm-2. The proposed method was successfully applied to the determination of MTP in its pharmaceutical formulations.