terclim by ICS banner
IVES 9 IVES Conference Series 9 Withering of the ‘Moscato giallo’ grapes under covered space

Withering of the ‘Moscato giallo’ grapes under covered space

Abstract

For the purpose of producing predicate wines in northern part of Croatia, grapes are traditionally left on the vine unpicked. However, grapes on the vine are exposed to unfavorable environmental conditions that affect rapid rotting and attacked by birds. To eliminate the mentioned risks, the grapes can be picked and placed in a protected space (loft, greenhouse, etc.) suitable for drying. This study presents the results of research on withering grapes of the ‘Moscato giallo’ variety in two tretment: sun drying (under covered terrace) and drying in the shade (loft). The following quality parameters were monitored: mass of grapes, sugar concentration, content of total acids, pH, content of organic acids. The total sugar content was determined refractometrically, the acid content was determined by neutralization with 0.1M NaOH and bromo-thymol as an indicator of pH change, the analysis of organic acids was carried out on an HPLC device. The research proved that in both treatment weight of the grapes and concentration of tartaric acid decreased during withering, while the concentration of sugar, malic acid, citric acid, and the content of total acids increased. Process of withering was shorter in sun drying treatment. Also, final concentration of sugar was higher in sun drying treatment. Final concentration of total acids, tartaric and malic acid was higher by drying in shade.

DOI:

Publication date: June 14, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Domagoj Stupić1*, Laura Banović1, Iva Šikuten1, Petra Štambuk1, Ivana Tomaz1, Darko Preiner1, Zvjezdana Marković1, Željko Andabaka1, Edi Maletić1, Jasminka Karoglan Kontić1

1 University of Zagreb Faculty of Agriculture, Svetošimunska cesta 25, Zagreb, Croatia

Contact the author*

Keywords

withering, Moscato giallo, sun drying, shade drying, organic acids

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Health benefits of wine industry by-products

The total global production of wine in 2021 was estimated at around 250 million hectoliters. The 30% of the total quantity of vinified grapes corresponds to wine by-products that represent nearly 20 million tons, of which 50% corresponds to the European Union. Wine by-products have been used for different purposes, in agriculture, cosmetics, pharmacy, biorefinery, feed, and the food

EFFECTS OF WINEMAKING FACTORS AND AGEING ON THE POLYPHENOLIC AND COLORIMETRIC PROFILES IN RED WINES PRONE TO COLOUR INSTABILITY

The effects of (A) grape freezing, and (B) malolactic fermentation, have been evaluated on the chemical and colorimetric profiles of red wines from Schiava grossa cv. grapes, thus prone to colour instability. The aim was to observe if specific variables (e.g. grape freezing) could improve the extraction and stability of pigments. The samples were studied from musts up to twelve months in bottle. The study was conducted with independent parallel micro-vinifications (12 = 4 theses x 3 replicates) under strictly-controlled conditions.

Politics meets terroir. The story of Prosecco – Are GI’s just a protectionist racket?

The recent Free Trade Agreement negotiations between Australia and the European Union have again put the issue of Geographical Indications (GIs) in the spotlight. Australia has long demonstrated its understanding of GIs and maintains a clear and rigorous GI protection system for wine. For many years, Australia’s wine sector was a strong advocate for GIs and a strong system to protect the

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.

An overview of wine sensory characterization: from classical descriptive analysis to the emergence of novel profiling techniques

The wine industry requires coexistence between tradition and innovation to meet consumers’ preferences. Sensory science allows the objective quantification of consumers’ understanding of a product and subjective feedback of consumer’s perception through acceptance or rejection of stimulus or even describing emotions evoked [1]. To measure sensations, emotions and liking, and their dynamics over time, time-intensity methods are crucial tools with growing interest in sensory science [2].