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Novel HPTLC densitometric methods for determination of tamsulosin HCl and tadalafil in their newly formulated dosage form; Comparative study and green profile assessment

M. Tantawy, S. A. Weshahy, Mina Wadie, M. Rezk

Biomedical chromotography, 2020

59 citations

Abstract

A promising combination of tamsulosin HCl and tadalafil has been recently introduced for treating two prevalent and associated urological disorders; benign prostate hyperplasia and erectile dysfunction. Novel HPTLC methods were designed and validated for assaying of the cited drugs in their challenging combined formulation. Separation was achieved using HPTLC silica gel 60 F254 plates as a stationary phase with a densitometric measurement at 280 nm. The proposed methods with two different chromatographic systems were successfully applied; a conventional mixture (method I) of ethyl acetate: toluene: methanol: ammonia [5:3:2:0.5, by volume] and a greener one (method II) with ethyl acetate: ethanol: ammonia [8:2:0.1, by volume]. The two methods were evaluated through a comparative study in terms of selectivity, tailing factor, developing time and concentration ranges. The greenness profile for each method was then appraised with several green guides namely; GlaxoSmithKline solvent sustainability guide, environmental, health and safety (EHS) tool, national environmental methods index (NEMI) and Eco-scale. Moreover, method specificity and peak homogeneity were evaluated by peak purity assessment using the winCATS® software spectral correlation tool. The methods have many potentials of being simple, fast, economic, selective and the greener one could be a good option for sustainable analysis of the drugs.

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