Abstract
A simple and sensitive spectrophotometric method was developed for the determination of clozapine in its dosage forms. The method is based on the reaction of the drug with potassium bromate in a perchloric acid medium to produce an intense yellow colored species exhibiting a maximum absorption at 308 nm. Beer's law is obeyed for up to 12.0 μg ml –1 with a correlation coefficient ( n = 6) of 0.9998 and a detection limit (3 S b) of 0.1 μg ml –1. The molar absorptivity is 1.986 × 10 4 l mol –1 cm –1. The various experimental parameters affecting the development and stability of the colored oxidation product were carefully studied and optimized. The proposed method was successfully applied to the determination of clozapine in its dosage forms. The results obtained were in good agreement with those obtained using the B.P. official method.
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