Measurement of white wines resistance against oxidation by Electron Paramagnetic Resonance spectroscopy. (1st January 2019)

• Record Type: Journal Article
• Authors: Nikolantonaki, Maria; Coelho, Christian; Noret, Laurence; Zerbib, Marie; Vileno, Bertrand; Champion, Dominique; Gougeon, Régis D.
• Is Part Of: Food chemistry. Volume 270(2019)
• Page Start: 156
• Page End: 161
• Publication Date: 2019-01-01
• Subjects: Electron Paramagnetic Resonance -- Sulfur dioxide -- Polyphenols -- Aging potential -- Radical chemistry; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2018.07.052
• Languages: English
• ISSNs: 0308-8146

Abstract

Graphical abstract: Abstract: Free radical theory of aging hypothesizes that oxygen-derived radicals are responsible for the storage-related flavor instability in wine. In an optimal situation, a balanced-distribution exists between oxidants and antioxidants among wines intrinsic/extrinsic metabolites. Based on the kinetic study of POBN-1-hydroxyethyl spin adduct (POBN-1-HER) formation in wines initiated via the Fenton reaction, a novel tool based on EPR spin trapping methodology was developed to quantify wines resistance against oxidation. Antioxidant capacities of wines were evaluated according to POBN-1-HER maximum signal intensity (Imax POBN-1-HER ) and rate formation (rPOBN-1-HER ) kinetic parameters. Low Imax POBN-1-HER and rPOBN-1-HER values suggest that endogenous antioxidants in wine are able to quench a substantial amount of radicals capable to take part in deleterious oxidative reactions. This will be very valuable in understanding aging potential and will provide an avenue to better control the process by knowing how it might be possible to change wines resistance against oxidation.