title: Flow Injection Photosensitized Chemiluminescence of Luminol with Cu(II)-Rose Bengal: Mechanistic Approach and Vitamin A and C Determination.
abstract: Rose Bengal photosensitized flow injection chemiluminescence method is reported using luminol-Cu(II) for the determination of vitamins A and C in pharmaceutical formulations. The reaction is based on the enhancement effect of analyte in the production of anion radicals of Rose Bengal (RB (•-)) which rapidly interact with dissolved oxygen and generate superoxide anions radicals (O2 (•-)) and hydrogen peroxide (H2O2). Highly reactive hydroxyl radicals ( (•) OH) were produced via dismutation of H2O2 by catalyst (Cu(2+)). The generated superoxide anions radicals and hydroxyl radicals thus oxidize luminol in alkaline medium to generate strong chemiluminescence. The limit of detection (3s of the blank, n = 6) of vitamins A and C and RB was found to be 0.008, 0.005, and 0.05 μg mL(-1), respectively. The sample throughput of 70 h(-1) for vitamins A and C and 30 h(-1) for RB was found. Calibration curve was linear in the range of 0.05-15, 0.01-20, and 0.1-50 μg mL(-1) for vitamins A and C and RB, respectively, with relative standard deviations (RSDs; n = 3) in the range 1.6-3.6%. The method was successfully applied to pharmaceutical formulations and the results obtained were in good agreement with the labeled values.
authors.affiliation: Department of Chemistry, University of Balochistan, Sariab Road, Quetta 87300, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Asgher
authors.affiliation: Department of Chemistry, University of Balochistan, Sariab Road, Quetta 87300, Pakistan.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Yaqoob
authors.affiliation: Department of Chemistry, University of Balochistan, Sariab Road, Quetta 87300, Pakistan.
authors.forename: Abdul
authors.initials: A
authors.lastname: Nabi
authors.affiliation: Department of Pharmacy, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan.
authors.forename: Ghulam
authors.identifier: 0000-0001-5649-5768
authors.initials: G
authors.lastname: Murtaza
authors.affiliation: Department of Biosciences, COMSATS Institute of Information Technology, Islamabad 45320, Pakistan.
authors.forename: Abdul Rauf
authors.initials: AR
authors.lastname: Siddiqi
authors.affiliation: Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
authors.forename: Amir
authors.identifier: 0000-0001-8414-0374
authors.initials: A
authors.lastname: Waseem