italianoenglishfrançaisdeutschespañolportuguês
Language
Search

Application of unconventional tannins as markers of authenticity

E. Longo, F. Rossetti, V. Merkyte, M. Jourdes, P.L. Teissedre and E. Boselli; Univ. of Bolzano, Univ. Politec. delle Marche-Italy, ISVV-France

Application of unconventional tannins as markers of authenticity

The goal of this work was to investigate the presence of novel cyclic proanthocyanidins (c-PD) in wine from South Tyrol and international grape varieties, and if the relative concentrations of these compounds were anyhow affected by the grape variety used or by the winemaking technology, e.g. the ageing procedure (barrel or steel tanks), cold stabilization or other vinification variables. As a result, two c-PD (one tetramer and one pentamer, both with one (epi)gallocatechin in the structure) were identified in the wines.

For the data processing, the relative abundances were normalized to yield the overall proportions of cyclic compounds per composition and number of monomers (%c-4-OH for the tetramer and %c-5-OH for the pentamer).The two normalized variables correlated significantly with the grape variety employed, whereas they did not with the other variables. %c-4-OH was below 20% in most wines except in Chardonnay where it was over 80%. %c-5-OH was between 60 and 100% in the Sauvignon blanc and Chardonnay wines, whereas it was absent in Gewürztraminer.

In the red wines the cyclic proportions were higher in Lagrein and lower in Merlot. Overall, by correlating with just one variable (the grape variety), these proportions can be useful in the development of new protocols for authenticity assessment.

Article based on the paper presented at the at the SIVE-ASSOENOLOGI Awards 2019 (12th edition of Enoforum (Vicenza, Italy, May 21-23, 2019)

Published on 21/10/2020
Related sheets
© All Right Reserved
ISSN 1826-1590 VAT: IT01286830334
powered by Infonet Srl Piacenza
Privacy Policy
This website and its related third-party services make use of cookies necessary for the purposes described in the cookie policy. If you want to learn more about cookies or how to disable them (either totally or partially), please see the cookie policy. By closing this banner, scrolling through this page, clicking on a link or continuing navigation in any other way, you consent to the use of cookies.
More informationOK

- A +
ExecTime : 3,171997