Journal
MOLECULES
Volume 17, Issue 3, Pages 3008-3024Publisher
MDPI
DOI: 10.3390/molecules17033008
Keywords
winery wastes; phenolics; adsorption; resins; radical scavengers
Funding
- Spanish Ministry of Education and Science [ALG2006-05387]
- European Union
- Xunta de Galicia [PGIDIT06 TAM38301PR]
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Grape and wine byproducts have been extensively studied for the recovery of phenolic compounds with antioxidant activity and a variety of biological actions. The selective recovery and concentration of the phenolic compounds from the liquid phase separated from further diluted winery wastes has been proposed. Adsorption onto non ionic polymeric resins and further desorption with ethanolic solutions was studied. Several commercial food grade resins were screened with the aim of selecting the most suited for the practical recovery of phenolic compounds with radical scavenging activity. Under the optimized desorption conditions (using Sepabeads SP207 or Diaion HP20 as adsorbents and eluting with 96% ethanol at 50 degrees C) a powdered yellow-light brown product with 50% phenolic content, expressed as gallic acid equivalents, was obtained. The radical scavenging capacity of one gram of product was equivalent to 2-3 g of Trolox.
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