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Natural Extracts from Fresh and Oven-dried Winemaking By-products As Valuable Source of Antioxidant Compounds

Overview
Journal Food Sci Nutr
Specialty Biotechnology
Date 2018 Sep 28
PMID 30258599
Citations 4
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Abstract

Winemaking by-products are a natural source of antioxidant components; however, due to their highly perishable and seasonal nature, they may require a prior conservation step before being processed. Natural extracts from fresh and oven-dried red grape agro-industrial by-products were obtained by ultrasound assisted extraction (UAE), using a hydroalcoholic solution as extracting solvent. Extracts were analyzed by HPLC-DAD-ESI-MS, to know the feasibility of winemaking by-products as natural sources of phenolic compounds, as well as the effect of the oven-drying treatment on the phenolic composition. Oven-drying at 45°C caused a significant decrease on the total phenolic content, which implied a reduction of the antioxidant capacity of the extracts. Also, it produced a decrease in total and individual flavan-3-ols, stilbenes, and flavonols, being greater in those extracts from stems. Respect to anthocyanins, which were only identified in grape pomace extracts, oven-drying caused an important decrease, being the peonidin-3-O-glucoside the more thermosensitive compound. Natural extracts from fresh or oven-dried winemaking by-products could be used in other food industries as a valuable source of phenolic compounds with antioxidant properties. However, further studies on other drying methods are required for addressing the preservation of phenolic compounds from winery by-products successfully.

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Phenolic Composition of Grape Stems from Different Spanish Varieties and Vintages.

Esparza I, Moler J, Arteta M, Jimenez-Moreno N, Ancin-Azpilicueta C Biomolecules. 2021; 11(8).

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Natural extracts from fresh and oven-dried winemaking by-products as valuable source of antioxidant compounds.

Marchante L, Alonso S, Alanon M, Perez-Coello M, Diaz-Maroto M Food Sci Nutr. 2018; 6(6):1564-1574.

PMID: 30258599 PMC: 6145223. DOI: 10.1002/fsn3.697.

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