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…

Use of glutathione and a selected strain of metschnikowia pulcherrima as alternatives to sulphur dioxide to inhibit natural tyrosinase of grape must and prevent browning

The enzymatic browning of grape must is still a major problem in oenology today [1] being particularly serious when the grapes have been infected by grey rot [2]. Browning is an oxidation process that causes certain foods to turn brown, which often leads to them being rejected by consumers [3]. This is a particular problem in the case of wine, because grape must is very vulnerable to enzymatic browning [4].

Read More

Data fusion approaches for sensory and multimodal chemistry data applied to storage conditions

The need to combine multimodal data for complex samples is due to the different information captured in each of the techniques (modes).

Read More

Basic Terroir Unit (U.T.B.) and quality control label for honey; making the designations of origin (A.O.C) and« crus » more coherent

Considérant d’une part la judicieuse mise au point d’un label de qualité contrôlée des miels suisses (STÖCKLI et al. 1997), considérant d’autre part l’élaboration d’une carte des paysages végétaux (HEGG et al. 1993),

Read More

Assessing and mapping vineyard water status variability using a miniaturized nir spectrophotometer from a moving vehicle

In the actual scenario of climate change, optimization of water usage is becoming critical in sustainable viticulture. Most of the current approaches to assess grapevine water status and drive irrigation scheduling are either destructive, time and labour consuming and monitor a small, limited number of plants. This work presents a novel methodology using a contactless, miniaturized, low-cost NIR spectrometer to monitor the vineyard water status variability from a moving vehicle, to provide reliable information towards precision irrigation.

Read More

Evaluation of intravarietal variability and selection for tolerance to downy mildew: The case of Antão Vaz variety in Portugal 

Antão Vaz is a Portuguese white grapevine variety grown mainly in the wine-growing regions of Southern Portugal, particularly in the Alentejo, Lisbon and Setúbal peninsula regions. It is a very vigorous and productive variety, giving the wines a strong identity. It needs heat and sunlight and prefers deep and dry soils, which makes it tolerant to scald caused by the high summer temperatures of Southern Portugal. However, this variety is very susceptible to downy mildew, caused by plasmopara viticola, a very destructive disease in years with rainy springs.

Read More