Macrowine 2021
IVES 9 IVES Conference Series 9 First identification of a glycosylated fraction involved in mushroom-off-flavor in grapes: influence of B. cinerea, powdery mildew and C. subabruptus

First identification of a glycosylated fraction involved in mushroom-off-flavor in grapes: influence of B. cinerea, powdery mildew and C. subabruptus

Abstract

An organoleptic defect, called fresh mushrooms off-flavor, appeared in wines and spirits since the 2000’s. Numerous researches demonstrated that octen-3-one, octan-3-ol and octen-3-ol (C8 compounds) were involved in the mushroom off-flavor in wines (Pallotta et al., 1998), (Darriet et al., 2002). Botrytis cinerea and other moldsplayed a role in the metabolism of such molecules directly on the grapes (La Guerche et al., 2006). Moreover, producers couldn’t detect this off-flavor in must but it appeared only in finished wines and the intensity can vary considerably during ageing of wines. Several biogenesis pathways have been proposed to explain the mushroom off-flavor in foods. In the fungus kingdom, the formation of C8 molecules came from the transformation of linoleic acid under the action of several enzymes (Wurzenberger & Grosch, 1984). Glycosidic precursors of octen-3-ol have been identified in several plants such as recently in soybean (Matsui et al., 2018). However, under oenological conditions, no clear mechanism has been established yet. AIM: So, the aim of this work was to (i) identify glycosidic precursors of C8 compounds and (ii) to evaluate the influence of different rots on the glycosylated fractions of different grape varieties. For this purpose, we studied different grades of rot defined by visual intensity (healthy, 1-5%, 10-15% and 20-25% of rots) of grapes and musts of Meunier, Pinot noir and Chardonnay affected by Botrytis cinerea, Powdery mildew and Crustomyces subabruptus. METHODS: From analytical point of view, glycosylated precursors were extracted on C18 cartridges (Lichlorut RP-18, 500 mg),then cleaved by a beta-glycosidase enzyme (Rapidase Revelation Aroma, 40°C, Overnight) and aglycones were analyzed byGC-MS (FS and SIM mode) as reported by Schneider in 2001. RESULTS: For the first time, we identified a glycosylated fraction able to release fresh mushroom aroma (octen-3-one, octen-3-ol, octan-3-ol) in Meunier and Pinot noir musts. Indeed, contaminated musts of Pinot noir treated by beta glucosidase enzyme released three times more octen-3-one than control. In the samples infected with Powdery mildew, we didn’t observe any production of these glycosides. Botrytis cinerea seemed to decrease the level of octen-3-one glycoside(s) as soon as level contamination reached at least 1%. Finally, a Pinot noir must contaminated by Crustomyces subabruptus involved an increase of the glycosylated fraction responsible for the octen-3-one by 31% in comparison with uncontaminated sample. CONCLUSION: In conclusion, the identification of a glycosylated fraction able to release fresh mushroom aroma compounds opens avenue to better understand the source of this specific taint and constitutes the first step to help winemakers to avoid off-flavor.

DOI:

Publication date: September 14, 2021

Issue: Macrowine 2021

Type: Article

Authors

Léa Delcros 

MHCS, Comité Champagne, Epernay, France,Teddy GODDET, SPO, Univ Montpellier INRAE, Institut agro, Montpellier, France  Sylvie COLLAS, Comité Champagne, Epernay, France  Marion HERVE, MHCS, Epernay, France  Bruno BLONDIN, SPO, Univ Montpellier INRAE, Institut agro, Montpellier, France  Aurélie ROLAND, SPO, Univ Montpellier, INRAE, Institut agro, Montpellier, France

Contact the author

Keywords

octen-3-one, octen-3-ol, glycosides, mushroom off-flavor, wine, botrytis cinerea, powdery mildew, crustomyces subabruptus

Citation

Related articles…

Methodological approach to zoning

An appellation or geographic indication should be based on the terroir concept in order to ensure its integrity. The delimitation of viticultural terroirs must include two consecutive or parallel steps, namely (a) the characterisation of the environment and identification of homogenous environmental units (basic terroir units, natural terroir units) taking all natural factors into account, as well as (b) the characterisation of the viticultural and oenological potential of these units over time.

Evaluation of the efficiency of dialysis membranes in the wine dealcoholization process

The global wine production is continuously evolving to meet the new demands and preferences of consumers. in this evolving scenario, it’s important to determine which trends will be short-lived and which will remain over time. The promotion of healthier habits has encouraged consumers to try to find alternatives with low or no alcohol content. The challenge for the industry is to produce an alcohol-free wine that retains the familiar aromas and mouthfeel of traditional wine but without alcohol. Ethanol is the most abundant compound in wine, excluding water.

ASSESSING THE ROLE OF 27 KNOWN BITTER COMPOUNDS IN COMMERCIAL WHITE WINES COMBINING LC-MS QUANTIFICATION AND SENSORY ANALYSIS

The balance between the different flavours of a wine largely determines its perception and appreciation by the consumers. In white wines, sweetness and sourness are usually the two poles balancing the taste properties. The bitter flavour, on the other hand, is frequently associated with a loss of equilibrium and all white wines (dry and sweet, young and aged) are affected.
Several bitter compounds are already well-described in wines.

Raffinose: a sweet solution for grapevine drought tolerance

Water tolerance in plants is often associated with the accumulation of osmotic protectants, which are secondary metabolites that can help the plant to cope with water stress. One of the key osmotic protectants is a sugar called Raffinose, which is synthesized by a family of enzymes called Raffinose synthases. In this work, we focused on one of these enzymes, VviRAF2, which is a gene that shows different expression levels and genetic variants (SNPs) among different grapevine cultivars, ranging from tolerant to susceptible to water stress, and the transcription factors that may regulate the expression of this gene family.

Intelligent use of ethanol for the direct quantitative determination of volatile compounds in spirit drinks

The quality of any alcoholic beverage depends on many parameters, such as cultivars, harvesting time, fermentation, distillation technology used, quality and type of wooden barrels (in case of matured drinks), etc.; however, the most important factor in their classification is content of volatile compounds.

Macrowine 2021
IVES 9 IVES Conference Series 9 First identification of a glycosylated fraction involved in mushroom-off-flavor in grapes: influence of B. cinerea, powdery mildew and C. subabruptus

First identification of a glycosylated fraction involved in mushroom-off-flavor in grapes: influence of B. cinerea, powdery mildew and C. subabruptus

Abstract

Content of the article

References

Section for all references

DOI:

Publication date: September 14, 2021

Issue: (ex: Issue: Terclim 2023)

Type: typeofpublication

Authors

author1, author2, author3

Presenting author

Description

List of affiliations ¹ ² ³

Contact the author

Email address (with mailto: link)

Keywords

List of different keywords (keyword1, keyword2, keyword3)

Tags

Citation

Related articles…

The interplay between water deficit and nitrogen and potassium nutrition in Vitis vinifera L.

Climate change is expected to provoke an increase in the frequency and intensity of drought events and water scarcity that will have detrimental effects on photosynthesis and plant yield. To sustain an appropriate plant yield under sub-optimal conditions, a common practice is the application of high amounts of fertilizers with negative environmental consequences. The present study aims at evaluating the interplay between water and nutrient availability, namely nitrogen (N) and potassium (K), in two grapevine cultivars with a different sensitivity to water shortage stress. Two-year-old Vitis Vinifera cv. Cabernet Sauvignon and Grenache grapevine plants grafted on SO4 rootstock have been transferred in pots under semi-environmental conditions.

Authenticating the geographical origin of wine using fluorescence spectroscopy and machine learning

Wine is a luxury product and a global beverage steeped in history and mystery. Over time, various regions have become renowned for the quality of wines they produce, which adds considerable value to the regions and the brands. On the whole, the international wine market is worth many hundreds of billions of dollars, which attracts unscrupulous operators intent on defrauding wine consumers.

Contribution of phenolic compounds to the total antioxidant capacity of Pinotage wine

The South African wine industry is taking an interest in the enhancement of red wine total antioxidant capacity (TAC) with retention of sensory quality to satisfy the demands of increasingly discerning consumers. The focus is especially on the unique South African red wine cultivar, Pinotage.

Innovative water status monitoring of white grape varieties with on-plant sensors

Context and Purpose. Climate change presents significant challenges to agricultural sustainability, particularly through the increasing frequency of drought and water scarcity.

From bush to glass: unlocking the potential of indigenous microbes in Australian wines

Global trends in the wine industry are changing, which is caused by consumer demands for aroma and flavour innovation. Producers in Australia, the sixth globally ranked wine producing country, are embracing this trend by exploring non-conventional yeast species to improve sensory qualities and achieve fermentation advantages.