title: Dinuclear copper(II) octaazamacrocyclic complex in a PVC coated GCE and graphite as a voltammetric sensor for determination of gallic acid and antioxidant capacity of wine samples.
abstract: A novel efficient differential pulse voltammetric (DPV) method for determination gallic acid (GA) was developed by using an electrochemical sensor based on [Cu2tpmc](ClO4)4 immobilized in PVC matrix and coated on graphite (CGE) or classy carbon rod (CGCE). The proposed method is based on the gallic acid oxidation process at formed [Cu2tpmcGA](3+) complex at the electrode surface. The complexation was explored by molecular modeling and DFT calculations. Voltammograms for both sensors, recorded in a HNO3 as a supporting electrolyte at pH 2 and measured in 2.5×10(-7) to 1.0×10(-4) M of GA, resulted with two linear calibration curves (for higher and lower GA concentration range). The detection limit at CGE was 1.48×10(-7) M, while at CGCE was 4.6×10(-6) M. CGE was successfully applied for the determination of the antioxidant capacity based on GA equivalents for white, rosé and red wine samples.
authors.affiliation: Department of Chemistry, Faculty of Natural Sciences and Mathematics, University of Priština, 38220 Kosovska Mitrovica, Serbia. Electronic address: bedpet@orion.rs.
authors.forename: B B
authors.initials: BB
authors.lastname: Petković
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11058 Belgrade 118, Serbia. Electronic address: dalibors@chem.bg.ac.rs.
authors.forename: D
authors.initials: D
authors.lastname: Stanković
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11058 Belgrade 118, Serbia. Electronic address: mmilcic@chem.bg.ac.rs.
authors.forename: M
authors.initials: M
authors.lastname: Milčić
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11058 Belgrade 118, Serbia. Electronic address: ssovilj@chem.bg.ac.rs.
authors.forename: S P
authors.initials: SP
authors.lastname: Sovilj
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11058 Belgrade 118, Serbia. Electronic address: manojlo@chem.bg.ac.rs.
authors.forename: D
authors.initials: D
authors.lastname: Manojlović
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D001372:Aza Compounds / Q000737:chemistry; D002138:Calibration; D002244:Carbon; D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D005707:Gallic Acid / Q000032:analysis*; D005898:Glass; D057230:Limit of Detection; D010084:Oxidation-Reduction; D011143:Polyvinyl Chloride; D011789:Quantum Theory; D014920:Wine / Q000032:analysis*
chemical_list: D000975:Antioxidants; D001372:Aza Compounds; D056831:Coordination Complexes; D005707:Gallic Acid; D002244:Carbon; D003300:Copper; D011143:Polyvinyl Chloride
keywords: Dinuclear copper(II) octaazamacrocyclic complex; Gallic acid; PVC matrix; Voltammetric sensor