Author : Salim Abdulaziz, Mohammad
Spectrophotometric Method for Determination of promethazine Hydrochloride in Pharmaceutical formulation Based on coupling with 4-Aminoacetanilide in Presence of N-BromoSuccinimide
karbala journal of pharmaceutical sciences,
Volume 9, Issue 14, Pages 104-119
A Simple, rapid and sensitive spectrophotometric method has been proposed for the assay of Promethazine hydrochloride in pure and pharmaceutical formulations. The method based on formation of a Chloroform-Soluble green colored product having an absorption maximum at 606nm with after coupling of PMZH with 4-Aminoacetanilide in presence of N-bromosuccinimide in acid media (HCl). The optimum conditions for the reaction are described Beer̕s law is obeyed in concentration range2.0-22µg/ml, (R2=0.9965) having molar absorptivity of 9530.136 L.mol-1.cm-1, Sandel sensitivity equal to 0.0336µg/cm2. The proposed method was successfully applied for estimation of Promethazine hydrochloride in Pharmaceutical (ample) formulations. The results demonstrated that the procedure is accurate, precise and reproducible RSD<0.4743%, DL=0.2129µg/ml, Average recovery=100.54% depending on the concentration of promethazine hydrochloride. No interference was observed from common excipients.