 IVES 9 IVES Conference Series 9 Chemometric profiling of Pinot noir wine from south tyrol as a tool to reach wine style goals

Chemometric profiling of Pinot noir wine from south tyrol as a tool to reach wine style goals

Abstract

AIM: Pinot Noir (PN) wines produced in South Tyrol were profiled with the aim to provide guidelines for the oenologist to reach specific winemaking goals in terms of typicity and quality. Different variables were considered to understand how they may influence the quality of the wine: vineyard position, altitude, vinification techniques, and storage conditions.

METHODS: A local winery produced 13 different PN (6 vineyards) (scheme below) in 2019 plus other control wines in 2020. Volatile compounds (GCxGC-ToF/MS) and polar compounds (HPLC DAD-FLD and offline LC-QqQ/MS) were determined. Multivariate and univariate statistical analyses were applied to understand which compounds are the most affected by the different winemaking techniques.

RESULTS: The effect on non-volatile phenols, anthocyanins, and aroma compounds were analysed to evaluate the quality and the typicity of PN of South Tyrol. Anthocyanins allowed to differentiate the vinifications. The most intense volatile compounds were ethyl ester, furfural, and other minor compounds, as evidenced by statistical analysis.

CONCLUSIONS

The use of chitosan in the vineyard and freezing of the grapes before pressing influenced the most the profile of polyphenols and anthocyanins in wines obtained from grapes harvested in the same vineyard. The present results suggest that similar effects can be observed for volatile compounds

DOI:

Publication date: September 7, 2021

Issue: Macrowine 2021

Type: Article

Authors

Simone Poggesi

Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy; Oenolab, NOITechpark, via Alessandro Volta 13, 39100 Bolzano BZ, Italy,Edoardo Longo, Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy; Oenolab, NOITechpark, via Alessandro Volta 13, 39100 Bolzano BZ, Italy Vakare Merkyte, Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy; Oenolab, NOITechpark, via Alessandro Volta 13, 39100 Bolzano BZ, Italy Giulia Zampiccoli, Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy; Oenolab, NOITechpark, via Alessandro Volta 13, 39100 Bolzano BZ, Italy Amedeo Mazzocchi, Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy; Oenolab, NOITechpark, via Alessandro Volta 13, 39100 Bolzano BZ, Italy Emanuele Boselli, Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, 39100 Bolzano, Italy; Oenolab, NOITechpark, via Alessandro Volta 13, 39100 Bolzano BZ, Italy

Contact the author

Keywords

hplc dad/fld, hplc-ms, gcxgc-tof/ms, chemometrics, chitosan, cryomaceration, destemming, ungrafted vines, frozen grapes

Citation

Raman spectroscopy as a rapid method to assess grape polyphenolic maturation and wine malolactic fermentation on site

Wineries can increase their economic and environmental sustainability by optimizing the winemaking procedures, from harvest to wine maturation and conservation. Based on analytical data of the chemical composition and wine sensory evaluation, the enologist makes his own decision regarding the enological interventions at the harvest date selection, winemaking and post-winemaking.

Evaluation of terroir suitability for vine cultivation in new areas using geographic multi-criteria decision support

Based on historical vine cultivation, the recent development of wine production in Drama wine region (Greece) has led to vine cultivation expansion of white and red varieties. The current cultivation of 500 ha of vineyards is expected to increase in the coming years. Natural terroir units (NTU) have been designed recently to support the production of high quality wines in the region [1]. The aim of this work is to evaluate the relevancy of the proposed NTUs regarding their suitability to produce wines of specific sensorial identity, and to provide guidelines for correct site selection for the expanding wine industry of the region.

Adsorption capacity of phenolics compounds by polyaniline materials in model solution

The aim of this work was to study the trapping capacity of four polyaniline polymers towards phenolic compounds in wine-like model solutions. METHODS: The model wine solution was composed of 12% (v/v) and 4 g/L of tartaric acid adjusted to pH = 3.6. A series of centrifuge tubes (15 mL) were filled with 10 mL of model solution enriched with 50 mg/L of five phenolic compounds (i.e., Gallic acid, caffeic acid, (+)-catechin, (-)-epicatechin, and rutin), and treated with different doses of PANI polymer (i.e., 0, 2, 4 and 8 g/L). After the addition of the polymer, the samples were stirred using a platform shaker at room temperature (20 ºC) for 2, 8, 16 and 24 h. All treatments included three replications.

Identification of γ-nonalactone precusor in Merlot and Cabernet-Sauvignon grapes

Wine flavor results on complexes interactions of odorous components, which come from different aromatic families like esters, thiols, aldehydes, pyrazines or lactones.

Zoning like base instrument for the agronomist’s work in vineyard

Ad una prima analisi l’interesse dimostrato dal settore produttivo nei confronti della zonazione vitivinicola è da ricondursi al fatto che dopo i primi approcci puramente accademici