Charge-transfer complex.

ABSTRACTA simple and sensitive spectrophotometric method has been developed for the determination of procainamide (PA) in pure and pharmaceutical formulations. The proposed method is based on the formation of charge-transfer complex between the drug and 1-chloro-2, 4-dinitrobenzene (CDNB). PA in the presence of CDNB formed yellowish red colored complex, which showed a maximum absorbance at 410 nm. The limit of detection and quantitation were 0.1183 mg/ml and 0.3940 mg/ml respectively. The influence of commonly used excipients on the determination of PA was studied. Keywords: Spectrophotometric method, Procainamide, CDNB, Charge-transfer complex.