Simultaneous high performance liquid chromatographic and derivative ratio spectra spectrophotometry determination of chlorpheniramine maleate and phenylephrine hydrochloride

Rapid, precise, accurate and specific high performance liquid chromatograph ic and derivative ratio spectra spectrophotometry procedures are described for the simultaneous analysis of chlorpheniramine maleate and phenylephrine hydrochloride in combined pharmaceutical dosage forms. The chromatographic methods were standardised using a LiChrosorb RP-C-18 column (5 mu m, 20 cm x 4.6 mm), UV detection at 269.0 nm and mobile phases consisting of methan ol/phosphate buffer (50 ml 0.2 M monobasic potassium phosphate (KH2PO4) + 3 4.7 ml 0.2 M NaOH; 70:30, apparent pH 7.2). Using derivative ratio spectra spectrophotometry, the amplitudes in the first derivative of the ratio spec tra at 238.9 and 280.0 nm were selected to determine chlorpheniramine malea te and phenylephrine hydrochloride in the mixture. Commercial nasal drops a nd laboratory-prepared mixtures containing both drugs in different proporti ons were assayed using the methods developed. Both methods showed good line arity, precision and reproducibility. (C) 1998 Elsevier Science S.A. All ri ghts reserved.