WAC 2022 banner
IVES 9 IVES Conference Series 9 WAC 9 WAC 2022 9 3 - WAC - Posters 9 Assessment of O2 consumption, a new tool to select bioprotection yeast strains

Assessment of O2 consumption, a new tool to select bioprotection yeast strains


Reduction of sulfur dioxide during winemaking is a request from the wine industry. To replace sulfur dioxide, various alternatives exist, including bioprotection by yeast inoculation. This practice consists in adding non-Saccharomyces yeasts directly on the grapes or must. The antimicrobial properties of non-Saccharomyces yeasts have already been demonstrated due a to niche occupation of the grape must, resulting in a decrease of fungal and acetic bacteria communities. Furthermore, their potential antioxidant properties by consuming oxygen hence reducing the browning of the must and maintaining GSH concentration in white wines has also been described. However, only a few strains of two non-Saccharomyces species were considered in the previous studies while it is known that a significant intra-species genetic diversity exists [1]. In this study, inter and intra species diversity were considered to evaluate O2 consumption by yeast during the prefermentary steps.

First, laboratory assays were optimized and various technological parameters were analyzed such as the O2 concentration, the physiological state of yeasts, the yeast dosages and mixed-combination. Subsequently, 47 yeast strains distributed over 6 enological species and representing their genetic diversity were selected. In order to measure on line dissolved oxygen, a compact FireStingO2 oximeter (Pyroscience, Aix-La-Chappelle, Germany) was used. The kinetics of O2 consumption by yeast in a grape must model medium were evaluated and the consumption rates were calculated and expressed as mg of O2 consumed per liter and per number of living cells (determined by flow cytometry). Thus, an Oxygen Consumption Rate (OCR) per strain was obtained, ranging from 15 to 65 mg/L.

Results show that an interspecific diversity can be highlighted. Indeed, some species consumed significantly more O2 than others. The O2 consumption in grape must by yeasts could be linked to their respiratory metabolism and correlated with a Crabtree effect. Moreover, for some species, intraspecific diversity was obtained revealing a variability which could be interesting to further investigate. These results provide important data for selecting new bioprotection strains in winemaking.


1.Masneuf-Pomarede, I.; Bely, M.; Marullo, P.; Albertin, W. The Genetics of Non-Conventional Wine Yeasts: Current Knowledge and Future Challenges. Frontiers in microbiology 2016, 6, 1563.


Publication date: June 27, 2022

Issue: WAC 2022

Type: Article


Claudia Nioi, Joana Coulon, Isabelle Masneuf-Pomarède,

Presenting author

Sara Windholtz – Univ. Bordeaux, INRAE, Bordeaux INP, UR OENOLOGIE, EA 4577, USC 1366, ISVV, F-33140 Villenave d’Ornon, France

Univ. Bordeaux, INRAE, Bordeaux INP, UR OENOLOGIE, EA 4577, USC 1366, ISVV, F-33140 Villenave d’Ornon France, | Biolaffort, 11 Rue Aristide Bergès, 33270 Floirac, France, | Bordeaux Sciences Agro, 33170 Gradignan, France – Univ. Bordeaux, INRAE, Bordeaux INP, UR OENOLOGIE, EA 4577, USC 1366, ISVV, F-33140 Villenave d’Ornon France

Contact the author


O2 consumption – bioprotection – SO2 alternative- non-Saccharomyces yeasts


IVES Conference Series | WAC 2022


Related articles…

Physiological and growth reaction of Shiraz/101-14 Mgt to row orientation and soil water status

Advanced knowledge on grapevine row orientation is required to improve establishment, management and outcomes of vineyards on terroirs with different environmental conditions (climate, soil, topography) and in view of a future change to more extreme climatic conditions. The purpose of this study was to determine the combined effect of row orientation, plant water status and ripeness level on the physiological and viticultural reaction of Shiraz/101-14 Mgt.

Effects of mechanical leafing and deficit irrigation on Cabernet Sauvignon grown in warm climate of California

San Joaquin Valley accounts for 40% of wine grape acreage and produces 70% of wine grape in California. Fruit quality is one of most important factors which impact the economical sustainability of farming wine grapes in this region. Due to the recent drought and expected labor cost increase, the wine industry is thrilled to understand how to improve fruit quality while maintaining the yield with less water and labor input. The present study aims to study the interactive effects of mechanical leafing and deficit irrigation on yield and berry compositions of Cabernet Sauvignon grown in warm climate of California.

The effects of cane girdling on berry texture properties and the concentration of some aroma compounds in three table grape cultivars

The marketability of the table grapes is highly influenced by the consumer demand; therefore the market value of the table grapes is mainly characterized by its berry size, colour, taste and texture. Girdling could cause accumulation of several components in plants above the ringing of the phloem including clusters and resulting improved maturity. The aim of the experiments was to examine the effect of girdling on berry texture characteristics and aroma concentration.

Application of a fluorescence-based method to evaluate the ripening process and quality of Pinot Blanc grape

The chemical composition of grape berries at harvest is one of the most important factors that should be considered to produce high quality wines. Among the different chemical classes which characterize the grape juice, the polyphenolic compound, such as flavonoids, contribute to the final taste and color of wines. Recently, an innovative non-destructive method, based on chlorophyll fluorescence, was developed to estimate the phenolic maturity of red grape varieties through the evaluation of anthocyanins accumulated in the berry skin. To date, only few data are available about the application of this method on white grape varieties.

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP.