 IVES 9 IVES Conference Series 9 Aroma composition of mono-varietal white wines for the production of Custoza

Aroma composition of mono-varietal white wines for the production of Custoza

Abstract

AIM: The appellation “Bianco di Custoza” or “Custoza”, born in 1971, is one of the oldest white wines Protected Designation of Origin in Italy. The production area lies on the morainic hills located south-east of Lake Garda, in the province of Verona. The wines belonging to this appellation are obtained from grapes of main varieties, namely Cortese B., Garganega, Trebbiano Toscano and Tocai Friulano alone or jointly for a minimum of 70% (each one not exceeding a maximum of 45%). In addition, Malvasia, Riesling Italico and Renano, Pinot Bianco, Chardonnay and Incrocio Manzoni (cross between Riesling Renano and Pinot Bianco) varieties, alone or jointly, can contribute to the production for a maximum of 30%. According to the appellation regulation, the sensory profile of these wines should be characterized by fruity and floral notes, sometimes with hints of aromatic herbs and spices.

The purpose of this study was to evaluate the volatile profile of monovarietal wines used in the production of Custoza.

METHODS: Cortese B., Incrocio Manzoni, Trebbiano Toscano, Garganega and Tocai Friulano mono-varietal wines were produced by a local winery during the 2020 vintage. Wines were samples at the end of alcoholic fermentation. Free volatile compounds were analyzed using SPME-GC-MS techniques. All data were treated by analysis of variance (ANOVA) for statistical purposes.

RESULTS: Greater presence of trans-linalool oxide, alpha-terpineol, TDN, methyl salycilate and dimethyl sulfide (DMS) was observed in wines produced from grapes of the Cortese B. variety, one of the four varieties main. Monovarietal wines produced from Incrocio Manzoni grapes, one of the minor varieties, showed a greater content of cis-linalool oxide. In Trebbiano Toscano, a greater content of linalyl acetate and beta-damascenone was observed, while a greater presence of methanthiol was found in wines produced from the Tocai Friulano variety

CONCLUSIONS

This study provided a first insight in the potential contribution of the different varietal wines belonging to the Custoza appellation to the aroma composition of the final wines. For both main varieties (Tocai Friulano, Trebbiano Toscano and Cortese B.) and secondary varieties such as the Incontro Manzoni, differences in terpene, norisporeninds and sulfur compound content were observed. Further studies should investigate whether these differences should be attributed to specific varietal patterns and/or to viticultural and winemaking variables.

ACKNOWLEDGMENT

he present work was supported by Cantina di Custoza

DOI:

Publication date: September 7, 2021

Issue: Macrowine 2021

Type: Article

Authors

Beatrice Perina

University of Verona,Davide, SLAGHENAUFI, University of Verona Giovanni, LUZZINI, University of Verona Maurizio, UGLIANO, University of Verona

Contact the author

Keywords

custoza, custoza varieties, white wine, aroma compounds

Citation

Valorization of wine lees for oenological interest by eco-responsible processes

Wine lees are the second most important wine by-product in terms of quantity after grape stalk and marc. During aging on lees, it is well known that wine lees yield compounds that act as antioxydant. However the chemical nature of the compounds involved in this behavior (except polyphenols and glutathione) has not yet been totally elucidated. The scarce knowledge of wine lees composition and their potential exploitation make them a promising candidate to obtain new antioxidant products to be used in winemaking. In this study, an eco-sustainable approach to obtain lees extracts exhibiting antioxidant capacity is proposed. Such extracts could be used in a global enological strategy of sulfites level reduction.

Effects of laccase from Botrytis cinerea on the oxidative degradation kinetics of the five natural grape anthocyanins

Enzymatic browning[1] is an oxidation process that occurs in many foods that increases the brown colour[2]. This problem is especially harmful in the wine industry[3]. especially when the grapes are infected by grey rot since this fung release the oxidative enzyme laccase[4]. In the particular case of red wines, the presence of laccase implies the deterioration of the red colour and can even cause the precipitation of the coloring matter (oxidasic haze)[5].

Vertical temperature gradient in the canopy provides opportunities to adapt training system in a climate change context

Aims: The aims of this study were (1) to measure the vertical temperature gradient in the vine canopy in parcels with different vineyard floor management practices and (2) to analyze the factors influencing this gradient. The objective was to investigate whether the increase of trunk height could be an adaptation strategy to reduce air temperature in the bunch zone in a context of climate change.

Spatial variability of grape berry maturation program at the molecular level

The application of sensors in viticulture is a fast and efficient method to monitor grapevine vegetative, yield and quality parameters and determine their spatial intra-vineyard variability. Molecular analysis at the gene expression level can further contribute to the understanding of the observed variability by elucidating how pathways responsible for different grape quality traits behave in zones diverging for one or the other parameter. The intra-vineyard variability of a Cabernet Sauvignon vineyard was evaluated by a standard Normalized Difference Vegetation Index (NDVI) mapping approach, employing UAV platform, accompanied by detailed ground-truthing (e.g. vegetative, yield, and berry ripening compositional parameters) that was applied in 14 spots in the vineyard. Berries from different spots were additionally investigated by microarray gene expression analysis, performed at five time points from fruit set to full ripening.

Grape ripening delaying with combined use of leaf removal and natural shading in Manto negro (Vitis vinifera L.) under deficit irrigation

The increasing frequency of heat waves during grape ripening presents challenges for the production of high-quality wine grapes. This underscores the significance of developing effective irrigation and canopy management techniques to optimize both yield and grape quality.
A field experiment was carried out during 2021 and 2022 using Manto negro wine grapes to study the effect of two irrigation strategies and different light exposure levels on grape quality. In a four-block experimental vineyard at Bodega Ribas in Mallorca, two irrigation treatments—moderate and severe deficit irrigation—were implemented. Within each irrigation plot, three light exposure treatments were randomly assigned, encompassing exposed clusters from pea size, non-exposed clusters, and shaded clusters after softening.