 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 Electrochemical diversity of italian white wines

Electrochemical diversity of italian white wines

Abstract

Analysis of phenolic compounds typically involve spectrophotometric methods as well as liquid chromatography combined with DAD, fluorimetric, or MS detection. However, the complexity of wine phenolic composition generated, in recent years, attention towards other analytical approaches, including those allowing rapid and inexpensive operations. Voltametric AIM Oxidation of white wine phenolics occurs at different stages during winemaking and storage and can have important implications for wine sensory quality. Phenolic compounds, in particular those with a ortho-diphenol moiety, are main target of oxidation in wine. Strategies for the methods are particularly suited for the analysis of oxidizable compounds such as phenolics. The redox-active species can be oxidized and reduced at the electrode, therefore, applications of electrochemistry have been developed both to quantify such species, and to probe wine maturation processes.3 The project on the diversity of Italian wines aims at collecting and analysing large-scale compositional dataset related to Italian white wines.

METHODS: The electrochemical properties of wine phenolics, and relative reducing strengths, have been examined using Cyclic Voltammetry (CV). Methods based upon disposable electrodes have been used, including carbon paste electrodes with undiluted wines.4 Cyclic voltammograms of more than 50 Italian white wines belonging to different appellations were collected and their features were analysed in conjunction with other parameters such as total phenolics, free and total SO2, acetaldehyde, and ascorbic acid. The wines were collected in the framework of the activities of the D-Wines (Diversity of Italian wines) project.

RESULTS: The results obtained indicated a great diversity of voltametric responses, although the ability to identify electrochemical features that were typical of wine types was rather limited with raw data. To obtain a higher number of discriminant features, derivative voltammograms were built and studied by multivariate statistical analysis. The region of the voltammograms comprised between 0-700 mV was found to contain several highly discriminating features across the entire dataset. Some of key features were identified and wines were classified accordingly.

CONCLUSIONS:

It is expected that these results will help developing rapid novel tools for phenolics analysis in the wine industry, where results from chemistry methods, or chromatographic procedures, take some time to obtain. Further research using electrochemical tools to probe ageing processes also has considerable prospects for shedding light on how to enhance quality characteristics in wine.

DOI:

Publication date: September 15, 2021

Issue: Macrowine 2021

Type: Article

Authors

Diletta, Invincibile

University of Verona,Davide, SLAGHENAUFI, University of Verona Giovanni, Luzzini, University of Verona Marangon, Matteo, University of Padua Mattivi, Fulvio, University of Trento Moio, Luigi, University of Naples ‘Federico II’ Versari, Andrea, University of Bologna Rio Segade, Susana, University of Turin Maurizio, UGLIANO, University of Verona

Contact the author

Keywords

white wine, carbon paste electrodes, phenolic compounds, cyclic voltammetry

Citation

Sélection génétique des variétés originelles d’Arménie, berceau de la viticulture mondiale

Armenia, a small country in the South of the Caucasus, has been rediscovering its wine-growing past since the discovery in 2007 of archaeological wine-growing remains dating back around 8,000 years. They are among the oldest in the world. Despite a great diversity of grape varieties, Armenian winegrowers did not have sufficiently organized genetic collections to produce plants and satisfy the growing demand for planting.

Molecular cloning and characterization of UDP-glucose: furaneol glucosyltransferase gene from Japanese

2,5-Dimethyl-4-hydroxy-3(2H)-furanone (furaneol) is an important aroma compound in fruits, such as pineapple and strawberry, and is reported to contribute to the strawberry-like note in some wines. Several grapevine species are used in winemaking, and furaneol is one of the characteristic aroma compounds in wines made from American grape (Vitis labrusca) and its hybrid grape, similar to methyl anthranilate. Muscat Bailey A is a hybrid grape variety [V. labrusca (Bailey) x V. vinifera (Muscat Hamburg)], and its wine is one of the most popular in Japan. The inclusion of Muscat Bailey A in the ‘International List of Vine and Varieties and their Synonyms’ managed by the ‘International Organisation of Vine and Wine (OIV)’ in 2013 has further fueled its popularity among winemakers and researchers worldwide.

Feminin vs masculin: the sensorial opposition between chambolle-musigny and gevrey-chambertin wines and the socioeconomical construction of a terroir/taste wine paradigm

At least since de XIXth century, wine writers oppose quite often the wines from Gevrey-Chambertin to the wines from Chambolle-Musigny claiming that the former are more “masculine” (full-bodied, powerful tannins, leathery, rustic…) and the later more “feminine” (delicate, elegant, silky, flowery…).

NEW INSIGHTS INTO VOLATILE SULPHUR COMPOUNDS SCALPING ON MICROAGGLOMERATED WINE CLOSURES

The evolution of wine during bottle ageing has been of great interest to ensure consistent quality over time. While the role of wine closures on the amount of oxygen is well-known [1], closures could also play other roles such as the scalping phenomenon of flavour compounds. Flavour scalping has been described as the sorption of flavour compounds by the packaging material, which could result in losses of flavour intensity. It has been reported in the literature that volatile sulphur compounds (VSC) can be scalped on wine closures depending on the type of closure (traditional and agglomerated cork, screw-cap, synthetic [2]).

Bioprotection of grape must by Metschnikowia sp.: genericity and mechanism

The market trend heads to food products with less chemical inputs, including in oenology. During the winemaking process, sulfites are commonly use to avoid microbiological contamination and stabilization of the wine thanks to its antimicrobial and antioxidant activities. Nevertheless, this use is not without consequences on human health and environment, leading for example to allergic reaction and pollution. A biological alternative to these sulfites has emerges: the bioprotection.