IVAS 2022 banner
IVES 9 IVES Conference Series 9 IVAS 9 IVAS 2022 9 Characterization and biological effects of extracts from winery by-products

Characterization and biological effects of extracts from winery by-products

Abstract

Pomace, stem, grapevine leaves, and vine shoots arise as so called winery by-products during the wine production process. Due to their high content of secondary plant metabolites, such as polyphenols, their usage as sources of bioactive compounds offers an opportunity to obtain value-added products for the food and pharmaceutical industry. The aim of the present study was to investigate extracts from winery by-products of Vitis vinifera L. cv. Riesling from the region ‚Pfalz‘ in Rhineland-Platinate, Germany with regard to their chemical composition and biological effect in vitro. Total phenolic contents (TPC) of pomace, stem, vine leaf, and vine shoot extracts were determined by Folin-Ciocalteu method and polyphenolic profiles were characterized by HPLC-UV/Vis-ESI-MS/MS. The extracts showed TPCs ranging from 432 to 665 mg GAE/g extract. Besides flavanols, as for example catechin, epicatechin and procyanidins, phenolic acids and flavonols, such as quercetin und kaempferol derivates were tentatively identified, amongst others, by HPLC-UV/Vis-ESI-MS/MS analysis in the negative ion mode. Stilbenes represent an additional group of polyphenols present in the extracts from winery by-products, including trans-resveratrol, piceid, piceatannol and ε-viniferin being identified. In the human hepatocarcinoma cell line HepG2 effects of the extracts on cell viability, intracellular ATP, the mitochondrial membrane potential (MMP), and tert-butyl hydroperoxide (TBH)-induced intracellular reactive oxygen species (ROS) were determined in vitro. Dose-dependent cytotoxic effects were observed besides protective effects regarding TBH-induced intracellular ROS level, and partially impaired MMP. Thus, winery by-products represent interesting sources of bioactive compounds exerting positive and/or negative effects on mitochondrial function in liver cells.

DOI:

Publication date: June 23, 2022

Issue: IVAS 2022

Type: Poster

Authors

Fuchs Christine1, Bakuradze Tamara1, Stegmüller Simone1, Steinke Regina1 and Richling Elke1

1TU Kaiserslautern, Department of Chemistry, Division of Food Chemistry

Contact the author

Keywords

polyphenols, HPLC-UV/Vis-ESI-MS/MS, extracts of winery by-products, Vitis vinifera L. cf. Riesling, liver cells

Tags

IVAS 2022 | IVES Conference Series

Citation

Related articles…

Screening of aroma metabolites within a set of 90 Saccharomyces strains

Currently, the main demand in the global wine market relies on products with unique flavour profiles, character, and typicity, and the metabolism of yeasts greatly influences the organoleptic properties of wines. Therefore, the natural diversity of Saccharomyces strains rises in interest over the last decade, but a large part of this phenotypic diversity remains unexplored

Read More

Influence of dipping pretreatments in drying of ‘Pedro Ximenez’ grapes in chamber at controlled temperature

The influence of dipping pretreatments on drying of ‘Pedro Ximenez’ grapes, destined to the elaboration of sweet wines, in chamber at controlled temperature, has been studied. Changes in color and phenolic composition of raisins produced were observed during the process of raisining.

Read More

Influence of the type of flavonol and the presence of mannoproteins in the copigmentation with malvidin 3-O-glucoside

To study the copigmentation between different wine flavonols (myricetin, quercetin, kaempferol, isorhamnetin and syringetin 3-O-glucosides) and malvidin

Read More

Active thermography to determine grape bud mortality: system design and feasibility

Bud death due to cold damage is a recurrent and major economic issue with Vitis vinifera L. in the Northeastern U.S. winegrowing regions. Primary buds – and sometimes secondary and tertiary buds – are often damaged by fluctuating temperatures in the winter and early spring. To maintain balanced vegetative and reproductive growth of a vine, pruning practices need to be adjusted to account for bud damage. Conventional bud damage assessment requires growers to sample canes/spurs, cut nodes with a razor blade, and then visually assess bud damage. This process is laborious and becomes a major barrier for damage-compensated pruning decision-making, leading to too few live buds per vine and the associated excessive vigor and low yield that result. The overarching goal of this study was to develop an active thermographic system for non-destructive detection of bud damage in the vineyard.

Read More

Fractal analysis as a tool for delimiting guarantee of quality areas

The pioneering work of Mandelbrot in the 70’s for building the fractal theory lead rapidly to many interesting applications in different fields such as earth sciences and economy.

Read More