terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Polysaccharide families of lyophilized extracts obtained from unfermented varietal grape pomaces

Polysaccharide families of lyophilized extracts obtained from unfermented varietal grape pomaces

Abstract

The recovery of bioactive compounds from grape and wine by-products is currently an important objective for revaluation and sustainability. Grape pomace is one of the main by-products and is a rich source of some bioactive compounds. The aim of this study was to evaluate the polysaccharide (PS) composition of extracts obtained from pomaces of different white and red grape varieties of Castilla y León. Grape pomaces were obtained after the pressing in the winemaking process. PS extracts were obtained following the method previously developed by Canalejo et al.[1], and the monosaccharide composition were evaluated by GC-MS[2] to determine the PS families which are PS rich in arabinose and galactose (PRAG), mannans (MN), rhamnogalacturonans of type II (RG-II), homogalacturonans (HG) and non pectic polysaccharides (NPP). Titratable acidity (TA), Brix degree and high molecular weight PS (HMWP) were also determined. Statistically significant differences were found in the PS families between different varietal grape pomaces and even within the same grape variety. The extracts from red and white grape varieties were separated in the figure defined by the first two principal components, which explained 66.1% of the total variance. The ones obtained from white grapes are mainly related to the TA, HG, MN, PRAG and HMWP, while those from red varieties are close to the Brix degree and RG-II. Only Cabernet Sauvignon variety is correlated mainly with the TA, HG and NPP as white grape varieties. To sum up, both the type of grape and the grape variety are important factors with influence PS composition of grape pomaces.

Acknowledgements: The authors would like to thank the AEI and the MICINN for the funding provided for this study through the project PID2021-123361OR-C21 (with FEADER funds). M. C-F. also thanks the MICINN and AEI for funding her predoctoral contract (PRE2020-094464).

References:

1) Canalejo et al. (2021) Optimization of a method to extract polysaccharides from white grape pomace by-products. Food Chem., 365: 130445, DOI 10.1016/j.foodchem.2021.130445

2) Guadalupe et al. (2012) Quantitative determination of wine polysaccharides by gas chromatography-mass spectrometry (GC-MS) and size exclusion chromatography (SEC). Food Chem., 131: 367-374, DOI 10.1016/j.foodchem.2011.08.049

DOI:

Publication date: October 16, 2023

Issue: ICGWS 2023

Type: Poster

Authors

María Curiel-Fernández1*, Zenaida Guadalupe2, Belén Ayestarán2, Silvia Pérez-Magariño1

1Instituto Tecnológico Agrario de Castilla y León, Ctra Burgos Km 119, 47071 Valladolid, Spain.
2ICVV-Universidad de La Rioja, Finca de La Grajera, Ctra. Burgos 6, 26007 Logroño, Spain.

Contact the author*

Keywords

polysaccharides, pomace, varietal grapes, by-products, revaluation

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Genetic study of wild grapevines in La Rioja region

Since the mid-1980s, several surveys have been carried out in La Rioja to search for populations of the sylvestris grapevine subspecies (Vitis vinifera L. subsp. sylvestris Gmelin). The banks of the Ebro River and its tributaries (Alhama, Cidacos, Leza, Iregua, Najerilla, Oja and Tirón rivers), as well as the surrounding vegetation of their valleys have been covered. So far, all the populations found are alluvial, forming part of the riparian vegetation of the Najerilla (the first reported population in La Rioja [1]), Iregua, and the vicinity of Oja valleys.

Biodiversity and biocontrol ability of Trichoderma natural populations in soil vineyards from Castilla y León region (Spain)

Trichoderma is a microorganism present in many agricultural soils and some of its species could be used as natural biological control agents. In this work, the presence of natural populations of Trichoderma was estimated in soil vineyard and its biocontrol capacity against Phaeoacremonium minimum, one of the main agent causals of grapevine trunk diseases instead of using pesticides. Moreover, physicochemical variables in soil such as pH, organic matter and nutrients were evaluated to determine a possible correlation to natural populations of Trichoderma.

Correlative study between degradation of rosé wine under accelerated conditions and under normal conditions

Several studies have tried to develop different methods to study the photodegradation of wine in an accelerated way, trying to elucidate the effect of light on the wine compounds[1]. In a previous study, our team developed a chamber that speeds up the photodegradation of rosé wine[2]. In the present work we have tried to establish a correlation between irradiation times in accelerated conditions and the natural exposure to the cycles of light that usually exist in markets or at home.

Exploring the genetic diversity of leaf flavonoids content in a set of Iberian grapevine cultivars: preliminary results

The use of grapevine genetic diversity is a way to mitigate the negative impacts of climate change on viticulture systems. Leaf epidermal flavonoids (including flavonols and anthocyanins) are involved in plant defense mechanisms against environmental stresses, like high temperatures or excessive solar radiation [1,2]. Among other factors, they modulate light absorption, which reduces photoinhibition processes in photosynthetic tissues [1]. Therefore, the identification of grapevine cultivars with an increased content on leaf epidermal flavonoids arises as a potential avenue to improve grapevine tolerance to some detrimental environmental stresses.

Effect of soil particle size on vine water status, leaf ABA content and berry quality in Nebbiolo grapes

The root and shoot abscisic acid (ABA) accumulation in response to water deficit and its relation with stomatal conductance is longtime known in grapevine. ABA-dependent and ABA-independent signalling response to osmotic stress coexist in sessile plants. In grapevine, the signaling role of ABA in response to water stress conditions and its influence on berry quality is critical to manage grapevine acclimation to climate change.