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Eurasian Journal of Analytical Chemistry
Volume 10, Issue 1 (May 2015), pp. 34-45

DOI: 10.12973/ejac.2015.104a

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Research Article

Published online on May 01, 2015

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Assay of Terbinafine Hydrochloride by Extractive-Spectrophotometry with Alizarin Red S-A Modified Approach

Nagib Abdullah Salem Qarah, Basavaiah Kanakapura, Swamy Nagaraju, Chandrashekar Udigere

Abstract

Terbinafine hydrochloride (TBH) is a new antifungal agent widely used for the treatment of many contagious diseases. Two spectrophotometric methods based on ion-pair complexation reaction are described for the determination of TBH. The first method is based on the formation of ion-pair complex between TBH and alizarin red S (ARS) dye in HCl medium followed by its extraction into methylene chloride and measurement at 450 nm (method A). The other method entails breaking of drug-dye complex in alcoholic KOH medium and measuring the absorbance of the blue dye at 570 nm (method B). The experimental conditions for selective and sensitive assay were optimized, and the drug-dye stoichiometry was found to be 1:1. Beer’s law was obeyed over the concentration ranges 2.5-60, and 4-24 µg mL-1 for method A and method B, respectively, and the corresponding molar absorptivity values were 5.92×103 and 4.93×103 L mol-1 cm-1, respectively. The limits detection (LOD) and quantification (LOQ) values were calculated to be 0.22 & 0.66 (method A) and 0.35 & 1.05 (method B). In addition, the methods were also validated with respect to accuracy, precision, robustness, ruggedness and selectivity. The two methods were applied to the analysis of tablets with no evidence of interference from excipients. 

Keywords: Terbinafine hydrochloride; Alizarin red S; spectrophotometry; Assay, Ion-pair complex .


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