Nuclear chemistry

Quantum mechanics

Voltage

Trolox equivalent antioxidant capacity

Electrochemistry

Chromatography

Cyclic voltammetry

Voltammetry

Square wave

Hydroxybenzoic acid

Antioxidant capacity

Physical chemistry

Physics

Organic chemistry

Trolox

Antioxidant

Radical

Chemistry

Electrode

Electroanalysis

A simple and sensitive electrochemical method for the determination of antioxidant capacity has been studied. 4‐hydroxybenzoic acid (4‐HBA) was used as a trapping agent for photogenerated . OH radicals, leading to 3,4‐dihydroxybenzoic acid (3,4‐DHBA). Square‐wave voltammetry was used to quantify the amount of 3,4‐DHBA formed from the reaction between 4‐HBA and . OH. Addition of antioxidants induced the competition between 4‐HBA and antioxidants toward . OH elimination, resulting in a decrease of the measured current. The IC 50 for different standard antioxidants was calculated and expressed in Trolox equivalent antioxidant capacity (TEAC). The proposed method was successfully compared to a fluorimetric one.

An Electrochemical Method for Sensitive Determination of Antioxidant Capacity