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…

Upscaling the integrated terroir zoning through digital soil mapping: a case study in the Designation of Origin Campo de Borja

homogeneous zones by intersecting several partial zonings of major factors that influence vineyard growth. Each of them follows specific process from their corresponding disciplines. Soil zoning specifically refers to a Soil Resource Inventory map that has traditionally been generated by conventional soil mapping methods. These methods have shortcomings in reaching fine cartographic and categorical details and involve significant expenses, which undermines their applicability. A new framework named Digital Soil Mapping has introduced quantitative models by statistical techniques to establish soil-landscape relationships and is able to provide intensive scale cartography. In the present study, a microzoning at 1:10.000 scale is generated from an initial zoning, where the conventional soil map with polytaxic map units is replaced by a new one from digital techniques that disaggregates them. The comparison between the zonings considers a quantitative evaluation of capability for each Homogeneous Terroir Unit by means of the Viticultural Quality Index and its categorization based on its distribution by map. The spatial intersection of both maps gives rise to a confusion matrix in which the flows of class variations after the substitution are assessed. The results show a five-fold increase in the number of Homogeneous Terroir Units identified and a larger differentiation among them, evidenced by a wider range in the capability index distribution. Both elements are accompanied by an increase in the detection of areas of higher potential within previously undervalued uniform zones.These features are a direct effect of the improvements brought by Digital Soil Mapping techniques and would verify the advantages of their implementation in the Integrated Terroir zoning. Eventually, such new highly detailed terroir units would benefit precision viticulture and sustainable management practices.

Spatial suitability analysis for site selection of vineyards using biophysical models and computational intelligence

Developing a sustainable agricultural production system and acquiring the full potential of land resources requires employing land-use assessment. This entails knowledge of the climate, soil, and topography of the area of interest.

Zoning of viticulture in Yugoslavia

The last official zoning of Viticulture in Yugoslavia was performed 1978. year, when (according to recommendation of OIV and European Economic Community), regions, sub regions and vineyards districts were established supposing that the varieties which will be exhibit ail the positive agro biological and technological characteristics.

Phenolic extraction and mechanical properties of skins and seeds during maceration of four main italian red wine grape varieties

AIM: Red grape varieties are characterized by different phenolic contents (prominently tannins and anthocyanins) found in skins and seeds.

Research summary on the use of Terroir as a wine purchasing cue

Due to the current challenging nature of the global wine market, and recent growth in number and strength of competitors from non-traditional wine producing countries, European wine producers are focussing on the potential to develop a competitive advantage through the concept of terroir.