Sensitive Spectrophotometric Determination of Triprolidine Hydrochloride Drug in the Capsules via Ion Pair Complex Formation

Abstract

The objective of this study was to develop two simple and selective visible spectrophotometric methods for the determination of antihistamine drug triprolidine hydrochloride (TRH) in the capsules. The methods were based on the formation of ion-pair complexes between TRH and two dyes, namely, bromocresol green (BCG) and bromophenol blue (BPB). The produced ion-pair complexes were measured at 415 and 410 nm for BCG and BPB methods, respectively. Beer’s law was applicable in the concentration ranges of 2.50-15.0 µg mL-1 TRH for both methods. The molar absorptivity values were found to be 2.12 × 104 and 2.07 × 104 L mol-1 cm-1 for the BCG method and BPB method, respectively, and the Sandell’s sensitivity values were 0.0149 and 0.0152 µg cm-2. The limits of detection and quantification were calculated and found to be 0.29 and 0.86 µg mL-1 for the BCG method and 0.31 and 0.95 µg mL-1 for the BPB method. The methods were applied successfully for TRH determination in bulk drug and in the capsules.