title: Voltammetric behaviour and square-wave voltammetric determination of the potent antioxidant and anticarcinogenic agent ellagic acid in foodstuffs.
abstract: The voltammetric behaviour of ellagic acid (EA) is investigated by cyclic, differential pulse and square-wave voltammetry (CV, DPV and SWV, respectively). Based on the anodic oxidation peak at approximately 0.42V in acetic/acetate buffer (pH 5.5) a robust and a highly reliable square-wave voltammetric method is presented for the determination of EA. The oxidation peak current was linearly dependent on the concentration of EA in the range of 1.0×10(-7)-1.5×10(-6)mol/L (r=0.9997), with a detection limit of 1.0×10(-8)mol/L (S/N=3) and a quantification limit of 3.4×10(-8)mol/L (S/N=10), good reproducibility and a satisfactory level of selectivity towards others polyphenols. The proposed method was applied to the determination of free and total EA in fruits, nuts and juices with good analytical results being obtained.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, E-30071 Murcia, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Cuartero
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, E-30071 Murcia, Spain. Electronic address: jortuno@um.es.
authors.forename: J A
authors.initials: JA
authors.lastname: Ortuño
authors.affiliation: Research Group on Quality, Safety and Bioactivity of Plant Foods, CEBAS-CSIC, E-30100 Murcia, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Truchado
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, E-30071 Murcia, Spain.
authors.forename: M S
authors.initials: MS
authors.lastname: García
authors.affiliation: Research Group on Quality, Safety and Bioactivity of Plant Foods, CEBAS-CSIC, E-30100 Murcia, Spain.
authors.forename: F A
authors.initials: FA
authors.lastname: Tomás-Barberán
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, E-30071 Murcia, Spain.
authors.forename: M I
authors.initials: MI
authors.lastname: Albero
keywords: Ellagic acid determination; Ellagitannins; Foodstuffs analysis; Square-wave voltammetry