terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 White grape must processed by UHPH as an alternative to SO2 addition: Effect on the phenolic composition in three varieties

White grape must processed by UHPH as an alternative to SO2 addition: Effect on the phenolic composition in three varieties

Abstract

The quantity and distribution of polyphenols in musts play a fundamental role in the white winemaking. This is because these substances are exposed to oxidation reactions, which are catalysed by the polyphenol oxidase (PPO), leading to a decrease in the quality of the wines produced. PPO is inactivated by SO2, but currently, due to the restrictions of the legislation, other methodologies are being investigated. Ultra-High Pressure Homogenization (UHPH) is a non-thermal physic technology that exerts an ultrahigh pressure pumping (>200 MPa) of a fluid through a valve in a continuous system. Passing through the valve causes a series of mechanical forces (impact, shear, cavitation, friction) which produce an antimicrobial and anti-enzymatic effect, as well as nanofragmentation in biopolymers. Since both, phenolic composition and PPO activity, depend on the variety, the research of the response of musts from different varieties to this technique is essential. This work investigates, by using HPLC techniques, the response of polyphenol oxidase activity, flavonols, flavanols, phenolic acids and total phenols to the application of a) the UHPH technique (working flow rate: 60 L/h, at 300 ± 3 MPa, inlet T of 4ºC, in-valve T of 95 ± 2 ºC for less than 0.2 s and an outlet T of 14 ºC) and b) SO2 (total dose 60 mg/L) of musts of Xarel·lo (Xar), Moscatel de Alexandria (M) and Garnacha blanca (Gb) from the 2022 vintage. The impact of the techniques applied depended on the variety considered and the effectiveness of UHPH could be established in the following pattern: Xar ≥ M > Gb. Moreover, phenolic acids were more sensitive to the action of SO2 than the UHPH. In general, with the exception of M must, phenolic acids, flavanols and total phenols responded similarly to both treatments applied.

Acknowledgements: This work is founded by Operational Groups of the European Association for Innovation (AEI) in terms of agricultural productivity and sustainability (operation 16.01.01 of the Rural Development Program of Catalonia (PDR) 2014-2022). Generalitat de Catalunya.

DOI:

Publication date: October 13, 2023

Issue: ICGWS 2023

Type: Poster

Authors

M. Esperanza Valdés-Sánchez1, Daniel Moreno-Cardona1, Nieves Lavado-Rodas1, Angela Fondon-Aguilar1, Gemma Roca-Domènech2 and Anna Puig-Pujol2

1Food and Agriculture Technology Institute of Extremadura (CICYTEX_INTAEX). Adolfo Suárez s/n Avenue, Badajoz, 06071, Spain
2INCAVI-IRTA. Catalan Institute of Vine and Wine – Institute of Agrifood Research and Technology. Plaça Àgora, 2. 08720 Vilafranca del Penedès, Barcelona, Spain

Contact the author*

Keywords

Xarel·lo, Moscatel, Garnacha blanca, flavonols, flavanols, phenolic acids

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

High-throughput sequencing analysis based on nematode indices revealed healthier soils of organic vineyards 

Proper soil health assessments are crucial for sustainable cropland. Among the widely employed approaches, evaluating nematode community structure is particularly suitable. Traditionally, the taxonomic characterization of soil nematodes has relied on time-consuming morphology-based methods requiring experienced experts. However, molecular tools like high-throughput sequencing have emerged as efficient alternatives. In this study, we performed a metataxonomic analysis of soil samples collected from 57 vineyards in the DOCa Rioja region of Northern Spain, focusing on the impact of organic viticulture and cover cropping compared to integrated pest management (IPM) and tilling practices.

is the overall ecological awarness among Spanish winemakers related to their attitudes towards natural wines?

The Agenda 2030 of the EU sets out the main guidelines for transitioning towards a resilient, green and safe economy. To this regard, the wine sector is experiencing an ecological transition in different ways such as increasing the production of ecological crops, or promoting the production of wines under more environmental-friendly and healthier (i.e., lower levels of SO2) products. These alternatives to conventional production are a smaller proportion of wines, in constant growth and demand, and follow alternative and minority practices, which range from sustainable to deeply philosophical thoughts. Among these methods there are organic, biodynamic and, more recently, natural wines.

Optimization of the ripening time of new varieties descendants of Monastrell

Given the impact of climate change on viticulture in the Region of Murcia, this paper attempts to expose the possibility of using genetic improvement as a dilemma that allows access to new descendant varieties of the autochthonous variety Monastrell crossed with varieties such as Syrah and Cabernet. Sauvignon, thus obtaining hybrids (Gebas and Myrtia). In it, the chromatic parameters and the phenolic profile of the new varieties will be compared with those obtained by the Monastrell variety at two moments during maturation (12 and 14 º Baumé), to check if the results would allow earlier harvests in these new varieties thus avoiding the decoupling between phenolic and technological maturity, while improving the quality of grapes and wines.

Model-assisted analysis of the root traits underlying RSA genotypic diversity in Vitis: a promising approach for rootstock selection?

By dissecting the root system architecture (RSA) into its underpinning components (e.g. root emission, axial growth, radial growth, branching, root direction or tropism) and identifying the relationships between them, functional-structural 3D root models are promising tools for analyzing the diversity and complexity of root system phenotypes with Genotype × Environment interactions. The model parameters are assumed to be synthetic traits, less influenced by the environment, and consequently with less polygenic architectures than the integrative RSA traits they drive. Root models can serve as a basis for in silico development of root system ideotypes by highlighting the developmental processes and parameters that most likely influence RSA fitness.

Climate change and viticulture in Nordic Countries and the Helsinki area

The first vineyards in Northern Europe were in Denmark in the 15th century, in the southern parts of Sweden and Finland in the 18th century at 55–60 degrees latitude. The grapes grown there have not been made into wine, but the grapes have been eaten at festive tables. The resurgence of viticulture has started with global warming, and currently the total area of viticulture in the Nordic countries, including Norway, is estimated to be 400–500 hectares, most of which is in Denmark. Southern Finland, like all southern parts of Northern Europe, belongs to the cool-cold winegrowing area.