title: A novel dilute and shoot HPLC assay method for quantification of irbesartan and hydrochlorothiazide in combination tablets and urine using second generation C18-bonded monolithic silica column with double gradient elution.
abstract: Irbesartan (IRB) and hydrochlorothiazide (HCT) are angiotensin-II receptor antagonist and thiazide-class diuretic compounds, respectively, which are in use in the treatment of hypertension. A novel dilute-and-shoot HPLC assay method for simultaneous quantification of IRB and HCT in fixed-dose combination tablets and urine samples was described. The separation of IRB, HCT and agomelatine (internal standard) was carried out using a second generation C18-bonded monolithic silica column (Chromolith(®) High Resolution RP-18e, 100×4.6mm, Merck KGaA), utilizing both mobile phase and flow rate gradient elution programs. The analytes were detected at 230 nm wavelength using photodiode array detector within 24 minutes with high resolution, observing about 50 percent more peak capacity when using second generation C18-bonded monolithic silica column. Urine samples were introduced into the system effortlessly, with only filtration and subsequent dilution. Validation studies were performed according to the official recommendations of USP and ICH, and the developed method was successfully applied to pharmaceutical tablets and urine samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmacy, Anadolu University, Yunusemre Campus, Eskisehir 26470, Turkey.
authors.forename: Sema
authors.initials: S
authors.lastname: Koyuturk
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmacy, Anadolu University, Yunusemre Campus, Eskisehir 26470, Turkey; Graduate School of Health Sciences, Anadolu University, Yunusemre Campus, Eskisehir 26470, Turkey. Electronic address: nafizoc@anadolu.edu.tr.
authors.forename: Nafiz Oncu
authors.initials: NO
authors.lastname: Can
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmacy, Anadolu University, Yunusemre Campus, Eskisehir 26470, Turkey.
authors.forename: Zeki
authors.initials: Z
authors.lastname: Atkosar
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmacy, Anadolu University, Yunusemre Campus, Eskisehir 26470, Turkey.
authors.forename: Goksel
authors.initials: G
authors.lastname: Arli
mesh_terms: D000081:Acetamides / Q000032:analysis; D001713:Biphenyl Compounds / Q000032:analysis* / Q000652:urine*; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D006852:Hydrochlorothiazide / Q000032:analysis* / Q000652:urine*; D000077405:Irbesartan; D057230:Limit of Detection; D012015:Reference Standards; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*; D013607:Tablets; D013777:Tetrazoles / Q000032:analysis* / Q000652:urine*; D009281:Naphthalenes
chemical_list: D000081:Acetamides; D001713:Biphenyl Compounds; D006852:Hydrochlorothiazide; D000077405:Irbesartan; D012822:Silicon Dioxide; D013607:Tablets; D013777:Tetrazoles; C084711:agomelatine; D009281:Naphthalenes
keywords: Dilute and shoot; Flow rate gradient elution; Hydrochlorothiazide; Irbesartan; Monolithic silica column