Grape seed pomace as a valuable source of antioxidant fibers

Grape seed pomace as a valuable source of antioxidant fibers

ABSTRACT BACKGROUND Grape seed pomace is a valuable by‐product from winery/oil extraction industries and a potential source of bioactive compounds. Hot water extraction is the most widely used technology for polysaccharide recovery from plant and seed sources. To obtain an antioxidant fiber‐rich ext...

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Bibliographic Details
Published in:Journal of the science of food and agriculture Vol. 99; no. 10; pp. 4593 - 4601
Main Authors: Costa, Gislaine NS, Tonon, Renata V, Mellinger‐Silva, Caroline, Galdeano, Melicia C, Iacomini, Marcello, Santiago, Manuela CPA, Almeida, Eveline L, Freitas, Suely P
Format: Journal Article
Language:English
Published: Chichester, UK John Wiley & Sons, Ltd 15-08-2019
John Wiley and Sons, Limited
Subjects:
antioxidant compounds
Antioxidants
Bioactive compounds
Fibers
grape by‐product
Grapes
hot water extraction
Organic chemistry
Phenolic compounds
Phenols
Polysaccharides
Sugar
Tannins
Temperature
Vitamin E
Wineries
winery waste
polysaccharides
grape by-product
antioxidant compounds
hot water extraction
winery waste
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Summary:ABSTRACT BACKGROUND Grape seed pomace is a valuable by‐product from winery/oil extraction industries and a potential source of bioactive compounds. Hot water extraction is the most widely used technology for polysaccharide recovery from plant and seed sources. To obtain an antioxidant fiber‐rich extract (AFE) from defatted grape seed pomace, seed:water ratio (1:10–1:20) and extraction temperature (70–90 °C) effects on extraction yield, total sugars, total phenolic compounds and condensed tannins were investigated. RESULTS The best extraction results were achieved at the highest seed:water ratio and temperature. At these conditions, the extraction yield and total sugar content of the freeze‐dried AFE were 100.1 g kg−1 and 725.3 g kg−1, respectively. The AFE presented high total phenolic content (16.2 g GAE kg−1), condensed tannins (515.1 mg CAT kg−1), soluble (219.1 g kg−1) and insoluble fibers (132.4 g kg−1), besides protein (171.1 g kg−1) and ash (152.6 g kg−1). The antioxidant capacity of the AFE was 382.7, 823.7 and 1439.4 μmol Trolox g−1 for DPPH, ABTS and ORAC methods. CONCLUSION The AFE was shown to be not only an interesting source of fiber with antioxidant capacity, which could become a potential foodstuff, but also an ecofriendly and sustainable alternative to use grape seed pomace. © 2019 Society of Chemical Industry
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ISSN:0022-5142
1097-0010
DOI:10.1002/jsfa.9698