Enoforum 2021
IVES 9 IVES Conference Series 9 Enoforum Web 9 Enoforum Web Conference 2021 9 Cellar session 9 Color stabilization properties of oenological tannins

Color stabilization properties of oenological tannins


The use of oenological tannins is authorized for many years by the OIV and advised for color stabilization. For this reason, winemakers look for a better understanding of tannins/anthocyanins interactions to produce deeply colored wines with great color stability during aging. Consequently, the aim of this work, was to verify/confirm the effectiveness of oenological tannins on wine color stabilization to be applied as a new tool by winemakers. 

To achieved this, a model wine solution containing 50 mg/L of malvidin-3-O-monoglucoside was supplemented with 10, 20 and 40 g/hL of commercial tannins (quebracho, ellagitannin, gallotannin, grape-skin and grape-seed) or (-)-epicatechin used as reference. After 1, 7, 14 and 21 days, the full absorbance spectrum (400-800 nm) was measured to determine the CIELAB coordinates and the copigmentation index (new proposed index based on CIELAB parameters). In parallel, samples were injected in HPLC-MS-QTOF to quantified the malvidin-3-O-monoglucoside and its possible degradation products. 

The obtained results show that malvidin-3-O-glucoside concentration decrease during the time accompanied by the formation of two degradation products. However, malvidin-3-O-glucoside decrease differs according to the added tannins meanwhile degradation product formation is the same for all the tannins. In this way, botanical origin of oenological tannins influences their effectiveness. Indeed, gallotanins and grape tannins are the most efficient to improve color stabilization during ageing by copigmentation and by inducing the formation of new polymerized pigments respectively.

Based on this work, oenological tannins have been authorized by the OIV, to stabilize the color of red wines with the modification of the OENO-TECHNO 612 and 613 sheets. 


Publication date: April 23, 2021

Issue: Enoforum 2021

Type: Article


Vignault A1,2., Gomez-Alonso S3., Jourdes M1., Canals J.M2., Zamora F2., Teissedre  P-L1.

1Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, 33882 Villenave d’Ornon cedex, France.
2Departament de Bioquímica i Biotecnología, Facultat d’Enologia de Tarragona, Universitat Rovira i Virgili, C/Marcel.li Domingo 1, 43007 Tarragona, Spain.
3Instituto Regional de Investigación Científica Aplicada, Universidad de Castilla-La Mancha, Ciudad Real, España

Contact the author


Enoforum 2021 | IVES Conference Series


Related articles…

Importance of matrix effects (wine composition) on protein stability tests of white and rosé wines

The presence of unstable proteins in wines can affect their stability and clarity. Before bottling, winemakers need to be sure that the wine is stable. A large number of stability tests have been proposed, usually based on heating a sample with a specific time-temperature couple. In practice, none is effective to accurately assess the risk of instability. Moreover, the interpretation of the results of these tests changes according to the region.

Analyse climatique à l’échelle des Coteaux du Layon

Les études d’impact du climat sur la vigne nécessite de descendre à des échelles très fines car les facteurs climatiques sont tributaires de la topographie, la végétation, les expositions … Dans le cadre du programme ANR-JC Terviclim, 22 capteurs ont été installés dans les vignobles des Coteaux du Layon afin de caractériser le climat particulier de ces terroirs. L’analyse des températures montre de fortes disparités entre les data loggers et pourtant situés parfois sur les mêmes parcelles ou sur des parcelles voisines. Les indices bioclimatiques tels les degrés jours sont également contrastés suivant la situation des capteurs sur les coteaux.

Satellite imagery : a tool for large scale vineyard management

Remote sensing, using Near Infra Red wavelength, can characterize within-vineyard variability using vegetation index. Between 2007 and 2009, a study was led on the vineyards of a cooperative winery, in Fitou area (France) aiming at characterizing vineyard oenological potential. A vegetation index, green leaf cover, developed on crops (wheat, rice, corn…) was implemented on vineyards.

Terroir effects on the response of Tempranillo grapevines to irrigation in four locations of Spain: agronomic performance and water relations

We report the effects of different drip irrigation treatments on the agronomic performance and water relations of Tempranillo grapevines, pruned to a bilateral cordon

Regenerative agricultural approaches to improve ecosystem services in Mediterranean vineyards

REVINE is a 3 year European projected funded by PRIMA programme which proposes the adoption of regenerative agriculture practices with an innovative and original perspective, in order to improve the resilience of vineyards to climate change in the Mediterranean area. The potential for innovation lies in developing and combining new approaches that make agriculture more environmentally sustainable and enable a circular economy capable of improving farmers’ incomes. Primarily REVINE aims to improve soil health and biodiversity by promoting the multiplication of soil saprophytic microorganisms and the presence of useful microorganisms linked to the life cycle of the plant, such as rhizobacteria (PGPR) and fungi (PGPF) that promote plant growth which, in addition to increasing plant performance, increase tolerance to biotic and abiotic stresses.