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IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Polyphenol content of cork granulates at different steps of the manufacturing process of microagglomerated stoppers treated with supercritical CO2 used for wine bottling

Polyphenol content of cork granulates at different steps of the manufacturing process of microagglomerated stoppers treated with supercritical CO2 used for wine bottling


The wine closure industry is mainly divided into three categories: screw caps, synthetic closures, and cork-based closures. Among this latter, microagglomerated cork stoppers treated with supercritical CO2 are now widely used, especially to avoid cork taint contaminations[1]. They are designed with cork granules obtained from cork offcuts of the punching process during the natural cork stoppers production. A previous study[2] showed that these stoppers released fewer polyphenols in 12 % (v/v) hydroalcoholic solution than natural cork stoppers. Thus, the present study aims to understand in which step of the manufacturing process of microagglomerated cork stoppers, phenolic compounds are eliminated and which polyphenols are likely to migrate into the wine during horizontal storage. Therefore, granulates from three different steps of the manufacturing process and supercritical CO2 water extracts were analyzed regarding their polyphenolic compounds. Polyphenol extraction was performed on granulates (1g) using 80 mL of acetone/water (70/30, v/v) acidified at 0.1% HCOOH in order to achieve a total extraction of polyphenols. Granulate extracts were then evaporated until dryness and recovered with 20 mL of 0.1% HCOOH acidified water. Polyphenols of the resulting samples and the supercritical CO2 water extracts were quantified by HPLC-MS after filtering. The granulates were also extracted with 12% (v/v) ethanol/water to carry out a sensory profile and thus to highlight possible olfactory and/or gustative differences between granulates at the different steps of the manufacturing process.

Acknowledgements: The authors would like to thank Diam Bouchage (Céret, France) for its financial support and for providing samples of granulates and also Christophe Loisel for his expertise in microagglomerated cork manufacturing.

1) Taylor, M. K., Young, T. M., Butzke, C. E., & Ebeler, S. E. (2000). Supercritical fluid extraction of 2, 4, 6-trichloroanisole from cork stoppers. Journal of agricultural and food chemistry, 48(6): 2208‑2211, DOI 10.1021/jf991045q
2) Gancel, A.-L., Jourdes, M., Pons, & Teissedre P.-L. (2023). Polyphenol migration from natural and microagglomerated cork stoppers to hydroalcoholic solutions and their sensory impact. Oeno-one (accepted on 3 June 2023).


Publication date: October 13, 2023

Issue: ICGWS 2023

Type: Poster


Anne-Laure Gancel1, 2, Michaël Jourdes1, 2, Alexandre Pons1, 2, 3 and Pierre-Louis Teissedre1, 2*

1 Univ. Bordeaux, Bordeaux INP, INRAE, OENO, UMR 1366, ISVV, F-33140 Villenave d’Ornon, France
2 Bordeaux Sciences Agro, F-33170 Gradignan, France
Tonnellerie Seguin-Moreau, ZI Merpins, 16103, Cognac, France

Contact the author*


wine bottling, microagglomerated cork stoppers, cork granulates, manufacturing process, supercritical CO2, phenolic compounds, sensory analysis


2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series


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