Simultaneous determination of Dimenhydrinate, Cinnarizine and Cinnarizine impurity by TLC and HPLC chromatographic methods

Publication date: Available online 30 January 2017 Source:Bulletin of Faculty of Pharmacy, Cairo University Author(s): Amal B. Ahmed, Nada S. Abdelwahab, Maha M. Abdelrahman, Fathy M. Salama Two chromatographic methods have been established and validated for simultaneous determination of mixture of Dimenhydrinate (DMH) and Cinnarizine (CIN) in their pharmaceutical formulation and in presence of Cinnarizine impurity (1-(Diphenylmethyl) piperazine); CIN impurity. The first method was TLC-densitometric one, depends on separation and quantitation of DMH, CIN and CIN impurity on TLC silica gel 60 F254 plates, using chloroform:methanol:glacial acetic acid:ammonia solution (9.5:0.5:0.1:0.1, by volume) as a developing system followed by densitometric measurement at 235nm. Linear relationships were obtained in the range of 0.2–2, 0.4–1.6 and 0.1–1μg/band for DMH, CIN and CIN impurity, respectively. The studied components were well resolved from each other with significantly different Rf values of 0.35, 0.52 and 0.04 for DMH, CIN and CIN impurity, respectively. The second method was RP-HPLC, separation on C8 column using 0.05MKH2PO4 (pH=3):methanol (35:65,v/v) as the mobile phase at a flow rate of 1mL/min and DAD detection at 240nm. Linear relationships were obtained in the ranges of 3–30, 2–20 and 1–10μg/mL, with significantly different Rt values of 3.27, 6.95 and 2.87min for DMH, CIN and CIN impurity, respectively. The developed methods were validated according to...
Source: Bulletin of Faculty of Pharmacy, Cairo University - Category: Drugs & Pharmacology Source Type: research