Macrowine 2021
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

Related articles…

Greffadapt: a relevant experimental vineyard to speed up the selection of grapevine rootstocks

[lwp_divi_breadcrumbs home_text="IVES" use_before_icon="on" before_icon="||divi||400" module_id="publication-ariane" _builder_version="4.20.4" _module_preset="default" module_text_align="center" module_font_size="16px" text_orientation="center"...

Impact of long term agroecological and conventional practices on subsurface soil microbiota in Macabeu and Xarel·lo vineyards

There is a growing trend on the transition from conventional to agroecological management of vineyards. However, the impact of practices, such as reduced-tillage, organic fertilization and cover crops, is not well-understood regarding the soil microbial diversity, and its relationship with the soil physicochemical properties in the subsurface depth near the rooting zone. Soil bacterial diversity is an important contributor towards plant health, productivity and response to environmental stresses. A field experiment was conducted by sampling subsurface soil bacterial community (NGS and qPCR) near to the root zone of Macabeu and Xarel·lo vineyards, located at the Penedes. 3 organic (ECO) and 3 conventional (CON) vineyards, with more than 10 years of respective management were sampled (n=5 each plot). ECO practices did not affect bacterial and fungal abundance but increased significantly the ammonium oxidizing bacteria and alpha-diversity (Inv.Simpson). Interestingly beta-diversity was significantly affected by the management strategy. ANOSIM-tests revealed a significative effect of the management (ecological vs conventional) and plot, on the soil microbial structure (ASV abundance). Main phyla depicted were Proteobacteria, Actinobacteria and Acidobacteria, whose relative abundances were not affected by the management. EdgeR assay revealed a significant increase of Cyanobacteria and decrease of Gemmatimonadetes and Firmicutes phyla in ECO. Interestingly, the grapevine variety was not correlated with the soil microbial community structure. Mantel-test revealed an important correlation (Spearman) of some physicochemical parameters with the soil microbiota structure, in order of importance: texture, EC, pH Ca/Mg, Mg/P, K+, Mg2+, Ca2+, SO42-, and OM. N-NH4 and NTK, which were higher in the ECO managed soils, did not correlated significantly with the soil microbiome population. The results revealed the importance of combining a deep physicochemical characterization of each replicate with the microbial diversity assessment to gain better insights on the relationship between soil microbiome and vineyard management.

Crop water stress index as a tool to estimate vine water status

Crop Water Stress Index (CWSI) has long been a ratio to quantify relative plant water status in several crop and woody plants. Given its rather well relationship to either leaf or stem water potential and the feasibility to sample big vineyard areas as well as to collect quite a huge quantity of data with airborne cameras and image processing applications, it is being studied as a tool for irrigation monitoring in commercial vineyards. The objective of this paper was to know if CWSI estimated by measuring leaf temperature with an infrared hand held camera could be used to substitute the measure of stem water potential (SWP) without losing accuracy of plant water status measure.

Grape seed powder as an alternative to bentonite for wine fining

PR proteins can cause haze in wines, and the risk is to keep the wine unsold. Generally, in winemaking bentonite solves this problem by removing proteins, but it is not a renewable resource, has poor settling, which means difficulty in filtering after use and a considerable loss of wine, it is not a specific adsorbent and may reduce aromas and flavor compounds

Interest and impact of PVP/PVI (Polyvinylpyrrolidone/ Polyvinylimidazole) on winemaking and final quality of wines

Céline Sparrow a, Christophe Morge a, a SOFRALAB SAS, 79, av. A.A. Thévenet – CS 11031 – 51530 Magenta, France Consumers’ health and security force authorities to limit, in wine as in others food industry products, the concentration in « dangerous » molecules. Therefore the legal limit in heavy metals keeps on decreasing. As per proof EU regulation just decrease the stain concentration in wine from 0,2 to 0,15 mg/l. Certain changes , such as sodium arsenite treatment in vines, disappearance of brass in wineries to the benefit of stainless steel, limit even more the concentration of heavy metals in wines. But the use of copper derivates in vines treatments is difficult to replace. In the case of wine and its elaboration, the problem is even more complex. Indeed, regulation forces the wine producers to control the concentration of certain heavy metals in final wines.