Spectrophotometric determination of metoclopramide hydrochloride in bulk and in pharmaceutical preparations

الملخص EN

A rapid, simple, reproducible and sensitive spectrophotometric method for assay of metoclopramide hydrochloride was investigated.

The method is based on the interaction of metoclopramide hydrochloride with 2,4-dinitro-1-flourobenzene reagent to give a highly coloured species with maximum absorption at 315 nm in aqueous solution in the presence of sodium hydroxide.

Beer's law was obeyed in the range of 1.0-28 g/ml with a molar absorptivity of 8.007×103 l.mol-1.cm-1 and the limit of detection was 0.01858 g/ml.

The accuracy (average recovery %) was 101.45 % and the relative standard deviation (RSD) was better than 1.3%.

Also, it was found that the product formed was in ratio of 1:1 species with stability constant of 2.975106 L/mol.

The method was applied successfully to the assay of metoclopramide hydrochloride in pharmaceutical formulations and was agreed well with its certified value and with those of standard addition and British pharmacopoeia methods.