Enoforum 2021
IVES 9 IVES Conference Series 9 Enoforum Web 9 Enoforum Web Conference 2021 9 Cellar session 9 Relation between phenolic content, antioxidant capacity, oxygen consumption rate of diverse tannins

Relation between phenolic content, antioxidant capacity, oxygen consumption rate of diverse tannins

Abstract

The work was aimed at comparing some analytical methods used to characterize oenological tannins and the measure of oxygen consumption rate (OCR), in order to provide oenologists with a rapid method to test the antioxidant capacity of tannin based products and a tool to choose the best suited product for each purpose. Seven tannins with different botanical origin were studied by determining the polyphenolic content (Folin-Ciocalteau assay, GAE%; Total Polyphenols Index, TPI%; Phloroglucinolysis, CT%), antiradical activity (DPPH), reducing capacity (FRAP), redox properties (Linear Sweep Voltammetry, LSV). The OCR was measured with a noninvasive luminescence-based technology in an oxygen saturated model wine solution, containing transition metals and metabisulphite to better simulate the oxidative conditions. The results showed a high variability in polyphenolic content due to the botanical origin of tannins. The OCR determined over 21 days was described by quadratic equations, with coefficients varying with the dose and botanical origin of tannins and with SO2 concentration. The tannins ranked differently for antioxidant capacity, depending on the kind of test. The OCR was correlated with the LSV and FRAP indexes. The Factor Analysis of data distinguished three causes of variability between tannins (3 Factors) and the analytical parameters describing them: 1) the richness in polyphenols (First Factor, explaining the 34.02% of the total data variability), described by GAE%, TPI%, DPPH; 2) the tannin typology (Second Factor, 27.4%), described by LSV and CT%; 3) the oxygen consumption rate (Third Factor, 30.00%), described by OCR, LSV, FRAP.

DOI:

Publication date: April 23, 2021

Issue: Enoforum 2021

Type: Article

Authors

Silvia Mottaa, Massimo Guaitaa, Claudio Cassinob, Antonella Bossoa

a Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria – Centro di Ricerca Viticoltura ed Enologia, via P. Micca 35, 14100 Asti, Italy
b Dipartimento di Scienze e Innovazione Tecnologica, Università degli Studi del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy

Contact the author

Tags

Enoforum 2021 | IVES Conference Series

Citation

Related articles…

AGING PATTERNS OF VARIETAL VOLATILE PROFILES OF WHITE WINES: A CASE STUDY ON 18 ITALIAN VARIETAL WHITE WINES

During wine aging many compositional changes take place. In particular, aroma undergoes dramatic modifications through a wide range of reactions that to date are only partly understood. Italy owns one of the largest ampelographic heritages worldwide, with over three-hundred different varieties. Among these, many white grapes are employed for the production of dry still white wines. Some of these wines are consumed young while others are more prone to aging. For many of these wines, the aging patterns related to volatile composition are still unknown.
Read More

Impact of Japanese beetles (Popillia japonica Newman) on the chemical composition of two grape varieties grown in Italy (Nebbiolo and Erbaluce)

The Japanese beetle, Popillia japonica Newman, is considered one of the most harmful organisms due to its ability to feed on more than 300 plant species. Symptoms indicative of adult beetles include feeding holes in host plants extending to skeletonization of leaves when population numbers are high. The vine is one of the species most affected by this beetle. However, the damaged plants, even if with difficulty, manage to recover, bringing the bunches of grapes to ripeness.

Read More

Testing the pathogen e-learning and field training course on grapevine virus knowledge and management

One of the reasons of the spread of grapevine virus diseases in
vineyards around the world is the lack of knowledge by the main actors of the wine sector. To face this problem, five partners worked together to develop the PAThOGEN project, a training program aimed to improve grapevine virus knowledge and management. The partnership gathers one French technical center (IFV), one Spanish university (USC), one Italian applied research center (CREA), one Spanish foundation
specialized in training and technology transfer (FEUGA) and one Italian SME specialized in the development of informatics tools and in knowledge transfer (HORTA).The objectives of PAThOGEN are: (i) to develop and
maintain a high-quality work-based Vocational and Education Training program, (ii) to improve the skills of professionals of the wine sector.

Read More

Fungal communites diversity and functional roles of different types of Botrytis cinerea infected grape berries on different growing sites

Botrytis cinerea, an Ascomycota pathogen with a broad host range, infects over 1200 plant species. Grapes infected by this pathogen, which subsequently develop a noble rot, remain in the vineyard for an extended period, thus being exposed to a diverse array of physical, chemical and biological factors, which give rise to a complex microbial community.

Read More

Decline of rootstock-mediated physiological responses in Tempranillo grapevines by prolonged extreme conditions

Agriculture faces many global warming challenges especially in the Mediterranean region. Many strategies have been proposed in viticulture to manage global warming. Rootstocks are among them since they may affect water uptake and the scion’s performance.
The study conducted in La Rioja, Spain, aimed to investigate the impact of different rootstocks (1103P and 161-49C) on the performance of the Tempranillo grapevine scion over a three-day cycles under drought and extreme conditions, specifically during a heatwave in July 2022, with maximum air temperatures up to 40ºC and average daily temperatures of 29.1ºC.

Read More