Author, as appears in the article.: Gancel, Anne-Laure; Vignault, Adeline; Pilard, Etienne; Miramont, Clement; Jourdes, Michael; Fermaud, Marc; Roudet, Jean; Zamora, Fernando; Teissedre, Pierre-Louis;
Department: Bioquímica i Biotecnologia
URV's Author/s: Teissedre, Pierre-Louis / Zamora Marín, Fernando
Keywords: Œnological tannins Sensory analysis Red wines Phenolic compounds Oxygen Oxidation Oenological tannins Musts Mechanisms Laccase activity Laccase Colour Cinerea Astringency Antioxidant
Abstract: The contamination of grape berries by Botrytis cinerea can drastically damage wine quality, in particular causing colour degradation. In musts obtained from botrytised grapes, SO2 addition is the main means of avoiding oxidation damage due to laccases excreted by the pathogen. However, consumers are becoming increasingly reluctant to accept SO2 addition to wine. Oenological tannins are used for fining wines because of their colloidal properties, and for wine colour stabilisation due to their ability to condense with anthocyanins. They are also known for their antioxidant and antioxidasic properties. They were thus investigated in the present study for their potential as an alternative to SO2 against laccase oxidation.The impact of various types of oenological tannins on musts and wines was studied once added to musts obtained from the Merlot cultivar, comprising 20 % and 50 % botrytised grapes. Laccase activity, antioxidant capacity, composition of phenolic compounds, spectrophotometric and CIELAB colour parameters were assessed in the musts and wines. Sensory analyses were also performed on 3-month-old wines to evaluate the visual, olfactory and gustative consequences of tannin addition. At a 50 % botrytisation rate, the addition of any type of oenological tannins (at a concentration of 100 g/hL) had no effect on laccase activity and did not protect phenolic compounds. However, at the same concentration and at a 20 % botrytisation rate, proanthocyanidin tannins from grape skin were found to be the most promising tannins with simultaneous protective effects, such as an inhibitory effect on laccase enzymes, protection of colour from complete degradation and preservation of some procyanidin compounds.Oenological tannins are promising candidates for protecting wines from Botrytis damage and they induce a differential effect according to their origin and structure. They could be used to reduce the amount of SO2 that is added during vatting. More research is needed to confirm and better understand the mode of action of various tannins at levels lower than the 20 % botrytised rate tested in the present study.
Thematic Areas: Horticulture Food science & technology Food science
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: fernando.zamora@urv.cat
Author identifier: 0000-0002-4213-3528
Record's date: 2024-07-27
Journal volume: 55
Papper version: info:eu-repo/semantics/publishedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Oeno One. 55 (2): 381-402
APA: Gancel, Anne-Laure; Vignault, Adeline; Pilard, Etienne; Miramont, Clement; Jourdes, Michael; Fermaud, Marc; Roudet, Jean; Zamora, Fernando; Teissedre, (2021). Impacts of added oenological tannins on red wine quality to counteract Botrytis infection in Merlot grapes. Oeno One, 55(2), 381-402. DOI: 10.20870/oeno-one.2021.55.2.4623
Entity: Universitat Rovira i Virgili
Journal publication year: 2021
Publication Type: Journal Publications
Repositori URV