Macrowine 2021
IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Chemical diversity of 'special' wine styles: fortified wines, passito style, botrytized and ice wines, orange wines, sparkling wines 9 Identification and quantification of molecular ellagitannins in cognac eaux-de-vie by a mass spectrometry method: barrel toasting and aging impact

Identification and quantification of molecular ellagitannins in cognac eaux-de-vie by a mass spectrometry method: barrel toasting and aging impact

Abstract

AIM: Ellagitannins are the main oak wood phenolic compounds that contribute to wine and spirits organoleptic quality (color, astringency, bitterness)(1-3). Given the lack of knowledge regarding their composition and evolution in spirits, the objectives were to follow their extraction kinetic in Cognac “eaux-de-vie” matured in barrel representing different toasting and to observe their evolution and structural modifications during aging.

METHODS: Eight different toasting levels were used for studying the impact of the toasting on ellagitannins composition. Two verticals (1978-2018) of “eaux-de-vie” samples coming from two terroirs were analyzed in order to observe ellagitannins evolution during aging. The above analyses were conducted using HPLC-Triple Quadrupole mass spectrometer (4) and the unknown compounds were identified by UPLC-Q-TOF, purified by preparative HPLC prior to 1D/2D-NMR analysis.

RESULTS: A general trend between the toasting levels and the individual ellagitannins content and composition was observed. Indeed “Eau-de-vie” aged in light toasted barrel has 40% higher castalagin content than in high toasting. During spirit aging, native ellagitannins content decreases over time. After two years, only castalagin remains quantifiable, suggesting that they undergo transformations leading to the formation of new compounds. Among them, whisky tannin B and A ([M-H]- ion peak at m/z 977.0896 and m/z 675.0834 respectively), resulting from the ethanol/castalagin or castalin reaction as well as some ellagitannin oxidation products like dehydrocastalagin and dehydroroburin D were identified for the first time in Cognac “eaux-de-vie” samples. The kinetic of the above compounds is in progress and the influence of both aging and barrel toasting is being researched.

CONCLUSIONS:

This work brings new insights on the Cognac ellagitannins content and how these molecules are influenced by aging and barrel toasting. Tastings will be performed to understand the organoleptic impact of these compounds.

DOI:

Publication date: September 15, 2021

Issue: Macrowine 2021

Type: Article

Authors

Mathilde Gadrat, Joel Lavergne, Catherine Emo, Pierre-Louis Teissedre, Kléopatra Chira,

1. Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, Univ. Bordeaux, Bordeaux INP, F33882 Villenave d’Ornon France 
2.   Courvoisier SAS, 2 places du château, 16200 Jarnac, France ,
Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, Univ. Bordeaux, Bordeaux INP, F33882 Villenave d’Ornon France 

Contact the author

Keywords

cognac, ellagitannins, mass spectrometry, toasting

Citation

Related articles…

Biodiversity in the vineyard agroecosystem: exploring systemic approaches

Biodiversity conservation and restoration are essential for guarantee the provision of ecosystem services associated to vineyard agroecosystem such as climate regulation trough carbon sequestration and control of pests and diseases. Most of published research dealing with the complexity of the vineyard agroecosystems emphasizes the necessity of innovative approaches, including the integration of information at different temporal and spatial scales and development of systemic analysis based on modelling. A biodiversity survey was conducted in the Franciacorta wine-growing area (Lombardy, Italy), one of the most important Italian wine-growing regions for sparkling wine production, considering a portion of the territory of 112 ha. The area was divided into several Environmental Units (EUs), defined as a whole vineyard or portion of vineyard homogenous in terms of four agronomic characteristics: planting year, planting density, cultivar, and training system. In each EU a set of compartments was identified and characterised by specific variables. The compartments are meteorology, morphology (altitude, slope, aspect, row orientation, and solar irradiance), ecological infrastructures and management. The landscape surrounding EU was also characterised in terms of land-use in a buffer zone of 500 m. For each component a specific methodology was identified and applied. Different statistical approaches were used to evaluate the method to integrate the information related to different compartments within the EU and related to the buffer zone. These approaches were also preliminarily evaluated for their ability to describe the contribution of biodiversity and landscape components to ecosystem services. This methodological exploration provides useful indication for the development of a fully systemic approach to structural and functional biodiversity in vineyard agroecosystems, contributing to promote a multifunctional perspective for the all wine-growing sector.

Seasonal dynamics of water and sugar compartmentalization in grape clusters under deficit irrigation

Water stress triggers functional compartmentalization in grapevines, influencing how resources are allocated to different plant organs.

First insights on the intra-species diversity in V. berlandieri: environmental adaptation and agronomic performances when used as rootstock

In grafted plants, such as grapevine, increasing the diversity of rootstocks available to growers is an ideal strategy to get adaptation to climate change. The rootstocks used for grapevine are hybrids of various American Vitis, including V. berlandieri. The rootstocks currently used in vineyards are derived from breeding programs involving very small numbers of parental individuals.

Handbook of the charter of the universal holistic metaethics  sustainability 4.1c” for certification and warranty bio-métaétique 4.1c

Defined the new paradigm, the applied philosophy, the methodology, the algorithm of the “Charter for Universal Holistic MetaEthic Sustainability 4.1C17.18”, research has continued to define and write, an
handbook that should be:”Complete Universal Holistic MetaEthics 4.1C of descriptors” of the “Charter for Sustainability Universal Holistic MetaEthic 4.1C17.18” with basic and applicative indexing. In these activities and research we have involved over 3500 Italian and non-Italian people from the research world to simple but educated, enlightened and enlightening citizens and we have analyzed over 180000
entries concerning the descriptors above, which represent the basic “descriptors”.

Delineation significance in viticultural zoning: examples in the Southern Côtes-du-Rhône

In order for a spatialized gestion of wine-producing areas, delineation of viticultural zones is needed. Viticultural zoning according to qualitative expression of varieties is a great concern