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Grape seed pomace as a valuable source of antioxidant fibers
Author(s) -
Costa Gislaine NS,
To Renata V,
MellingerSilva Caroline,
Galdeano Melicia C,
Iacomini Marcello,
Santiago Manuela CPA,
Almeida Eveline L,
Freitas Suely P
Publication year - 2019
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9698
Subject(s) - pomace , chemistry , abts , trolox , dpph , food science , extraction (chemistry) , proanthocyanidin , antioxidant , sugar , polyphenol , chromatography , organic chemistry
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