IVAS 2022 banner
IVES 9 IVES Conference Series 9 IVAS 9 IVAS 2022 9 Grape stems as preservative in Tempranillo wine

Grape stems as preservative in Tempranillo wine

Abstract

SO2 is the most widely used preservative in the wine industry. However, there are several drawbacks related with the use of SO2 in wine such as its toxicity and the unpleasant odor in case of excess. These reasons justify the importance of searching alternatives to reduce or eliminate this preservative from wine. The grapes stems are discarded early on in the winemaking process, in spite of containing large amounts of polyphenolic compounds with antioxidant activity. The aim of this work was to determine whether the ground stem and its extract had the potential to replace SO2 in wine. For this, five Tempranillo red wines were made: a positive control with SO2 (60 mg/L); a negative control without any preservatives; a wine with Tempranillo stem extract (200 mg/L); a wine with a combination of Tempranillo stem extract (100 mg/L) and SO2 (20 mg/L), and a wine with ground Tempranillo stem (310 mg/L). After a year of bottle storage under cellar conditions, the wines with different treatments had similar values for antioxidant capacity (ABTS), total polyphenolic or total anthocyanin content. The most abundant individual polyphenols found in all samples were gallic and caftaric acids, catechin and malvidin-3-glucoside. The evolution of all these compounds throughout the winemaking process followed the literature. Positive control wine had a higher concentration of caftaric acid. The concentrations of gallic acid, catechin and malvidin-3-glucoside were more homogenous among treatments. The sensory analysis by a triangular test showed that the positive control wine was only perceptibly different from the Tempranillo extract wine and the negative control at 99% confidence level. Tempranillo stem wine only differed from the wine that combined SO2 and extract. Negative control wine differed from all treatments, except Tempranillo stem. This may indicate both the Tempranillo extract and ground stem may be good total or partial substitutes for SO2 as an antioxidant in red wines.

DOI:

Publication date: June 23, 2022

Issue: IVAS 2022

Type: Poster

Authors

Nogueira Danielle1, Jiménez-Moreno Nerea1, Esparza Irene1 and Ancín-Azpilicueta Carmen1

1Public University of Navarre

Contact the author

Keywords

antioxidants, by-products, sulfite replacement

Tags

IVAS 2022 | IVES Conference Series

Citation

Related articles…

Effect of post-harvest ozone treatments on the skin phenolic composition and extractability of red winegrapes cv Nebbiolo and Barbera

Wine industry is looking forward for innovative, safe and eco-friendly antimicrobial products allowing the reduction of chemical treatments in the grape defense and the winemaking process that can affect negatively the quality of the product. Ozone has been tested in food industry giving good results in preventing fungi and bacteria growth on a wide spectrum of vegetables and fruits, due to its oxidant activity and ability to attack numerous cellular constituents. Ozone leaves no chemical residues on the food surface, decomposing itself rapidly in oxygen. Gaseous ozone has been already tested for table grapes storage and on wine grapes during withering.

Read More

Impact of industrial-scale serial filtration on macromolecules in red wines

Filtration is a critical step in ensuring the clarity and microbial stability of wine prior to bottling. However the process of filtering potentially reduces red wine quality by removing some of the macromolecules that contribute to the texture of the wine. Commercial red wines, Cabernet Sauvignon (CAS) and Shiraz (SHZ), of two vintages and two grades (premium grade wines from the older vintage: CAS13 and SHZ13; and standard grade wines from a younger vintage: CAS14 and SHZ14) were filtered through industrial-scale commercial filtration units prior to bottling. Samples were taken before and after cross-flow filtration, lenticular filters, 0.65 µm and 0.45 µm pore size nylon membrane filters. The concentration and composition of macromolecules, including tannins and polysaccharides, were measured in all samples as well as particle size distribution and wine colour.

Read More

Les préparations biodynamiques 500 et 501 ont elles un effet sur la vigne ?

Dans le cadre de TerclimPro 2025, Markus Rienth a présenté un article IVES Technical Reviews. Retrouvez la présentation ci-dessous ainsi que l’article associé : https://ives-technicalreviews.eu/article/view/8396

Read More

Iso-/anisohydric behavior in wine grapes may be a matter of soil moisture

There are claims that wine grape cultivars are either isohydric or anisohydric; the former maintaining, and the latter decreasing, their plant water status as soil moisture declines. However, available information is inconsistent. There are those that show an existence of a continuum in cultivar response to soil moisture rather than a distinct categorization. Others even show both behaviors in the same cultivar grown in different environments. In this study we investigated the behavior of 30 own rooted Vitis vinifera cultivars during successive drydown and rewatering cycles over two growing seasons in arid eastern Washington (<200 mm annual precipitation).

Read More

The effects of antioxidants and gas sparging on New Zealand white wines

This study aims to investigate the effects of different conditions of grape processing or fermentation on the aroma profile of New Zealand white wines.

Read More