title: Electrochemical methods as a tool for determining the antioxidant capacity of food and beverages: A review.
abstract: The growing interest in functional foods had led to the use of analytical techniques to quantify some properties, among which is the antioxidant capacity (AC). In order to identify and quantify this capacity, some techniques are used, based on synthetic radicals capture; and they are monitored by UV-vis spectrophotometry. Electrochemical techniques are emerging as alternatives, given some of the disadvantages faced by spectrophotometric methods such as the use of expensive reagent not environmentally friendly, undefined reaction time, long sample pretreatment, and low precision and sensitivity. This review focuses on the four most commonly used electrochemical techniques (cyclic voltammetry, differential pulse voltammetry, square wave voltammetry and chronoamperometry). Some of the applications to determine AC in foods and beverages are presented, as well as the correlation between both spectrophotometric and electrochemical techniques that have been reported.
authors.affiliation: Interdisciplinary Group of Molecular Studies (GIEM), Chemistry Institute, School of Exact and Natural Sciences, University of Antioquia, Medellín, Colombia.
authors.forename: Jorge
authors.initials: J
authors.lastname: Hoyos-Arbeláez
authors.affiliation: Interdisciplinary Group of Molecular Studies (GIEM), Chemistry Institute, School of Exact and Natural Sciences, University of Antioquia, Medellín, Colombia.
authors.forename: Mario
authors.initials: M
authors.lastname: Vázquez
authors.affiliation: BIOALI Research Group, Food Department, Faculty of Pharmaceutical and Food Sciences, University of Antioquia, Street 67 No. 53-108, Medellin, Colombia. Electronic address: jose.contrerasc@udea.edu.co.
authors.forename: José
authors.initials: J
authors.lastname: Contreras-Calderón
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D001628:Beverages / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods*; D005504:Food Analysis / Q000379:methods*
chemical_list: D000975:Antioxidants
keywords: Antioxidant capacity; Chronoamperometry; Cyclic voltammetry; Differential pulse voltammetry; Electrochemical methods; Square-wave voltammetry