 IVES 9 IVES Conference Series 9 Use of membrane ultrafiltration technology to achieve protein stabilisation of white wine

Use of membrane ultrafiltration technology to achieve protein stabilisation of white wine

Abstract

AIM: Proteins in white wine can cause cloudiness or haze after bottling, which consumers may consider an indicator of poor quality. As a consequence, winemakers often use bentonite, a clay-based material that binds protein, to remove proteins and achieve protein stabilisation. However, removing bentonite from wine after treatment can result in a 3-10% loss of wine (1). Membrane filtration technology is used in wine production for many purposes and ultrafiltration (UF) offers an easily-translatable process for protein removal (1). UF treatment of wine can produce heat-stable permeate and protein-enriched retentate, which enables targeted protein degradation. Heating the retentate, with or without protease significantly improved the heat stability of recombined wine in pilot scale trials (2). This study evaluated strategies for achieving protein stabilisation using membrane filtration.

METHODS: Sauvignon blanc wine (unfined) was fractionated by UF in triplicate, the resulting retentate subjected to protease and heat (62℃, 10 min) treatment, and the treated retentate recombined with the permeate. Traditional bentonite fining was performed as a positive control. Chemical and sensory analyses were carried out to evaluate the efficacy of treatment.

RESULTS: Heating retentate with protease reduced the concentration of haze-forming proteins by 54% compared with heating alone 40%. Chemical analyses and quality scores for recombined wine showed no significant difference with bentonite-fined wines. Sensory analysis indicated that UF/heat-treatment increased the green apple aroma, alcohol heat and overall flavour intensity of the wines compared to bentonite fined wines, suggesting UF-treated wines retained flavour without imparting oxidative characters.

CONCLUSIONS

Ultrafiltration combined with heat and protease treatment can reduce bentonite use without significantly affecting sensory properties. While results are promising, it is not yet a viable alternative to bentonite fining.

DOI:

Publication date: September 7, 2021

Issue: Macrowine 2021

Type: Article

Authors

Yihe Sui

The University of Adelaide, School of Agriculture, Food and Wine; Australian Research Council Training Centre for Innovative Wine Production.,David, WOLLAN, VAF Memstar; Australian Research Council Training Centre for Innovative Wine Production – Jacqui, MCRAE, The University of Adelaide, School of Chemical Engineering and Advanced Materials – Richard, MUHLACK, The University of Adelaide, School of Agriculture, Food and Wine; Australian Research Council Training Centre for Innovative Wine Production – Peter, GODDEN, The Australian Wine Research Institute – Kerry, WILKINSON, The University of Adelaide, School of Agriculture, Food and Wine; Australian Research Council Training Centre for Innovative Wine Productin

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Keywords

white wine heat stability, haze, ultrafiltration, wine protein, protease

Citation

Stabilità dei caratteri fenotipici dl alcune cv in diversi pedopaesaggi friulani. Applicazione del metodo nella caratterizzazione viticola del comprensorio DOC “Friuli-Grave”

This communication was estracted from a study concerning the viticultural characterization of A.V.A. “Friuli-Grave” area sponsored by Chamber of Commerce of Pordenone.

Application of ultrasonic and refractometric measurements in enological samples and related model solutions

AIM: The refractive index is a basic optical property of materials and a key tool for the determination of major components in musts, such as sugars

INSIGHTS ON THE ROLE OF GENES ON AROMA FORMATION OF WINES

Yeast secondary metabolism is a complex network of biochemical pathways and the genetic profile of the yeast carrying out the alcoholic fermentation is obviously important in the formation of the metabolites conferring specific odors to wine. The aim of the present research was to investigate the relative expression of genes involved in flavor compound production in eight different Saccharomyces cerevisiae strains.
Two commercial yeast strains Sc1 (S.cerevisiae x S.bayanus) and Sc2 (S.cerevisiae) and six indigenous S. cerevisiae strains (Sc3, Sc4, Sc5, Sc6, Sc7, Sc8) isolated during spontaneous fermentations were inoculated in Assyrtiko and Vidiano grape must.

Use of multispectral satellite for monitoring vine water status in mediterranean areas

The development of new generations of multispectral satellites such as Sentinel-2 opens possibilities as to vine water status assessment (Cohen et al., 2019). Based on a three years field campaign, a model of Stem Water Potential (SWP) estimation on vine using four satellite bands in Red, Red-Edge, NIR and SWIR domains was developed (Laroche-Pinel et al., 2021). The model relies on SWP field measures done using a pressure chamber (Scholander et al., 1965), which is a common, robust and precise method to assess vine water status (Acevedo-Opazo et al., 2008). The model was mainly developed from from SWP measures on Syrah N (Laroche Pinel E., 2021).

A large scale monitoring was organized in different vineyards in the Mediterranean region in 2021. 10 varieties amongst the most represented in this area were monitored (Cabernet sauvignon N, Chardonnay B, Cinsault N, Grenache N, Merlot N, Mourvèdre N, Sauvignon B, Syrah N, Vermentino B, Viognier B). The model was used to produce water status maps from Sentinel-2 images, starting from the beginning of June (fruit set) up to September (harvest). The average estimated SWP for each vine was compared to actual field SWP measures done by wine growers or technicians during usual monitoring of irrigation programs. The correlations between mean estimated SWP and mean measured SWP were at the same level than expected by the model. (Laroche Pinel, 2021) The general SWP kinetics were comparable. The estimated SWP would have led to same irrigation decisions concerning the date of first irrigation in comparison with measured SWP.

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Microclimate manipulation: leveraging the microclimatic differences created by diverse trellis systems to investigate the metabolic plasticity of Vitis vinifera cv. Chenin blanc in a model vineyard

Field-grown crops such as grapevines, rely on ambient environmental conditions for growth and development.