IVAS 2022 banner
IVES 9 IVES Conference Series 9 IVAS 9 IVAS 2022 9 Analysis of mousy off-flavour wines

Analysis of mousy off-flavour wines

Abstract

Winemakers are increasingly experimenting with new techniques, such as spontaneous fermentation, prolonged yeast contact, higher pH, minimal sulphur dioxid, filtration and clarification or oxidative ageing. Along with this, the risk of microbial spoilage increases, and so the off-flavour mousiness, long time underestimated, is becoming more frequent. Characteristic of the mousy off-flavour is the delayed perception after swallowing the wine. After a few seconds the flavour appears, reminiscent of a dirty mouse cage. There are three known compounds that cause mousy off-flavor: 2-ethyltetrahydropyridine, 2-acetyltetrahydopyridine, and 2-acetylpyrroline. Yeasts such as Dekkera/Brettanomyces and heterofermentative lactic acid bacteria like Lactobacillus hilgardii can release these compounds.

This study focuses on the analysis of mousy wines. This includes the quantitative analysis of mousy off-flavour compounds in wine using liquid chromatography with mass spectrometry (HPLC-MS). In order to identify the microorganisms in mousy wines, a next-generation sequencing analysis was carried out. Based on these results, a qPCR method will be developed to quantify the corresponding microorganisms in wine. 

DOI:

Publication date: June 27, 2022

Issue: IVAS 2022

Type: Poster

Authors

Dietzel Caroline1, Wegmann-Herr Pascal1 and Scharfenberger-Schmeer Maren2

1Institute for Viticulture and Enology (DLR-Rheinpfalz)
2University of Applied Sciences, Kaiserslautern

Contact the author

Keywords

Mousy off-flavour, Wine fault, qPCR, Next-Generation-Sequenzing, LC-MS

Tags

IVAS 2022 | IVES Conference Series

Citation

Related articles…

Biodiversity and genetic profiling of autochthonous grapevine varieties in Armenia: A key to sustainable viticulture

Armenia, as one of the ancient centers of grapevine domestication, harbors a unique repository of genetic diversity in its indigenous and wild grapevine populations, highlighting a key role in the millennia-lasting history of grape cultivation in the Southern Caucasus (Margaryan et al., 2021).

New varieties descendant from Monastrell with lower sugar and high phenolic content adapted to warm climates

Given that climate change is a continuous process, it is necessary to constantly search for new strategies that help the viticulturist sector to mitigate its consequences. All adaptation strategies will have a greater or lesser effect that in turn will be marked by the times of action. As a long-term action, a genetic breeding program to obtain new varieties descendant from Monastrell has been developed in the Region of Murcia (more specifically, in the IMIDA Research Center) since 1997. In this program, new red varieties have been developed through directed crosses of the Monastrell variety with other varieties such as Cabernet Sauvignon, Tempranillo and Syrah.

Risposte enologiche del Nero d’Avola su suoli a diverso grado di salinità

Vengono riportati i risultati enologici di uno studio condotto sul Nero d’Avola in un tipico ambiente viticolo siciliano, in cui insistono suoli che presentano un diverso grado di salinità.

Aroma profile of ‘Pedro Ximenez’ sweet musts obtained from dried grapes by different methods

Aroma fraction of musts from grapes ‘Pedro Ximenez’ traditionally sun-dried and chamber-dried at 40 ºC and at 50 ºC during 8, 5 and 4 days respectively, destined for the production of sweet wines in Montilla-Moriles region (southern Spain) was studied.

Studying PIWIs in three dimensions: agronomic, economic and ecological evaluation of 14 fungus-tolerant cultivars in Luxembourg

Growing fungus-tolerant cultivars (PIWIs) reduces the need of fungicide use by 50-80 %. PIWIs have the potential to address climate change adaptation and mitigation simultaneously.