terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Detoxification capacities of heavy metals and pesticides by yeasts 

Detoxification capacities of heavy metals and pesticides by yeasts 

Abstract

Winegrowing is still characterized by the extensive use of chemical fertilizers and plant protection products, despite strong recommendations to limit these practices. A part of these xenobiotics and metals are then found in grape juice and wine, causing a major health concern, as well as negatively affecting the fermentation process. In recent years, there has been renewed interest in non-Saccharomyces yeasts. These species have a wide phenotypic diversity, which would be exploited to broaden the aromatic palette of wines. The potential of some of these species as a bio-protection agent, in pre-fermentation treatment, has also been established.

In addition to these characteristics, the heavy metal sorption capacities of these species are mentioned in the literature. Pre-fermentation treatment of the harvest with non-Saccharomyces (NS) yeasts therefore appears to be an alternative to the use of chemical inputs for the elimination of organic and inorganic xenobiotics from grape musts. However, our knowledge of the detoxification capacities of yeasts and their molecular and biochemical determinant is not yet sufficiently advanced to allow such methods to be developed and put into practice.  In this study, we investigated the detoxifying abilities of fourteen strains of Saccharomyces and non-Saccharomyces yeasts during the first stages of wine fermentation. Fermentations were conducted in synthetic must in the presence or absence of pesticides (mix of twenty pesticides commonly used in the vineyard) / metals (copper). The colorimetric determination of copper concentration throughout fermentation revealed that most Saccharomyces and non-Saccharomyces yeasts detoxify almost all copper in less than 48 hours. Regarding pesticides detoxification, quantified by GC-MS (Dubernet laboratory), a higher variability was observed, with a removal of 0% to 90% of the compound depending on the yeast strain and the pesticide. In conclusion, this study showed the great diversity of the capacity of yeasts to detoxify molecules used in vineyards to fight against diseases and/or parasites and the biotechnological potential that this represents.

DOI:

Publication date: October 3, 2023

Issue: ICGWS 2023

Type: Article

Authors

Tristan Jacqui1,2, Celine Raynal2, Amandine Deroite2, Vincent Bouazza3 , Carole Camarasa1

1SPO, INRAe, Institut Agro Montpellier, Montpellier, France
2LALLEMAND SAS, Blagnac, France

3Laboratoire Dubernet, Narbonne, France

Contact the author*

Keywords

non-Saccharomyces yeasts, wine quality, heavy metals, pesticides, detoxification

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Phenolic composition profile of cv. Tempranillo wines obtained from severe shoot pruning vines under semiarid conditions

One of the limitations of vineyards in warm areas is the loss of wine quality due to higher temperatures during the grape ripening period. In order to adapt the vineyards to these new climatic conditions, a possible solution is to delay the ripening process of the grapes towards periods with milder temperatures, by means of management practices and thus improve the quality of the fruit and the wine produced. The technique of severe shoot pruning (SSP) has proven useful in achieving this objective.

Grapevine cane pruning extract enhances plant physiological capacities and decreases phenolic accumulation in canes and leaves 

Vine cane extracts are a valuable byproduct due to their rich content of polyphenols, vitamins, and other beneficial compounds, which can affect and benefit the vine and the grapes. This study aims to evaluate the response of grapevine plants to irrigation with water supplemented with a vine cane extract, both at physiology response and phenolic composition in different parts of the plant (root, trunk, shoot, leaf, and berry).
Cane extract was obtained by macerating crushed pruning residues with warm water (5:1) and pectolytic enzymes. Two-year-old potted plants were irrigated with water (Control) while others were irrigated with cane extracts, either at 1:4 (w/v, cane extract/water; T 1:4) or at 1:8 (w/v, cane extract/water; T 1:8).

Climate change and viticulture in Nordic Countries and the Helsinki area

The first vineyards in Northern Europe were in Denmark in the 15th century, in the southern parts of Sweden and Finland in the 18th century at 55–60 degrees latitude. The grapes grown there have not been made into wine, but the grapes have been eaten at festive tables. The resurgence of viticulture has started with global warming, and currently the total area of viticulture in the Nordic countries, including Norway, is estimated to be 400–500 hectares, most of which is in Denmark. Southern Finland, like all southern parts of Northern Europe, belongs to the cool-cold winegrowing area.

Investigation of cellulose nanofiber-based films used as a protective layer to reduce absorption of smoke phenols into wine grapes

Volatile phenols from wildfire smoke are absorbed by wine grapes, resulting in undesirable smoky and ashy sensory attributes in the affected wine.[1] Unfortunately the severity of wildfires is increasing, particularly when grapes are ripening on the vine. The unwanted flavors of the wine prompted a need for solutions to prevent the uptake of smoke compounds into wine grapes. Films using cellulose nanofibers as the coating forming matrix were developed as an innovative means to prevent smoke phenols from entering Pinot noir grapes. Different film formulations were tested by incorporating low methoxy pectin or chitosan.

Do wine sulphites affect gut microbiota? An in vitro study of their digestion in the gastrointestinal tract

“Sulphites” and mainly sulphur dioxide (SO2) is by far the most widely used additive (E-220/INS 220) in winemaking and likely the most difficult to replace. The well-known antioxidant, antioxidasic and antimicrobial properties of SO2 make this molecule a practically essential tool, not only in winemaking, but also in the production of other food products. The current trend in winemaking is the reduction of this unfriendly additive due to its negative effects on health and environmental. In particular, it could cause headaches and intolerance/allergic reactions in sensitive individuals. Wine is considered one of the major contributors of exposure of SO2 in the adult population, when this beverage is included in the diet.