Validated HPTLC methods for determination of some selected antihypertensive mixtures in their combined dosage forms

Publication date: Available online 14 August 2014 Source:Bulletin of Faculty of Pharmacy, Cairo University Author(s): Rasha A. Shaalan , Tarek S. Belal , Fawzy A. El Yazbi , Sohila M. Elonsy Simple and selective HPTLC methods were developed for the simultaneous determination of the antihypertensive drugs; carvedilol and hydrochlorothiazide in their binary mixture (Mixture I) and amlodipine besylate, valsartan, and hydrochlorothiazide in their combined ternary formulation (Mixture II). Effective chromatographic separation was achieved on Fluka TLC plates 20×20cm aluminum cards, 0.2mm thickness through linear ascending development. For Mixture I, the mobile phase composed of chloroform–methanol in the ratio 8:2v/v. Detection was performed at 254nm for both carvedilol and hydrochlorothiazide. For Mixture II, the mobile phase was chloroform–methanol–ammonia in the volume ratio 8:2:0.1. Detection was performed at 254nm for valsartan and hydrochlorothiazide, and at 365nm for amlodipine. Quantification was based on spectrodensitometric analysis. Analytical performance of the proposed HPTLC procedures was statistically validated with respect to linearity, ranges, precision, accuracy, specificity, robustness, detection and quantification limits. The linearity ranges were 0.05–1.0 and 0.1–2.0μg/spot for carvedilol and hydrochlorothiazide, respectively in Mixture I, 0.1–2.0, 0.1–2.0 and 0.2–4.0μg/spot for amlodipine, hydrochlorothiazide and valsartan, respecti...

Source: Bulletin of Faculty of Pharmacy, Cairo University - October 13, 2014 Category: Drugs & Pharmacology Source Type: research