title: Recovery and concentration of antioxidants from winery wastes.
abstract: 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 °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.
authors.affiliation: Departamento de Enxeñaría Química, Universidade de Vigo (Campus Ourense), Edificio Politécnico, As Lagoas, Ourense 32004, Spain.
authors.forename: María Luisa
authors.initials: ML
authors.lastname: Soto
authors.forename: Enma
authors.initials: E
authors.lastname: Conde
authors.forename: Noelia
authors.initials: N
authors.lastname: González-López
authors.forename: María Jesús
authors.initials: MJ
authors.lastname: Conde
authors.forename: Andrés
authors.initials: A
authors.lastname: Moure
authors.forename: Jorge
authors.initials: J
authors.lastname: Sineiro
authors.forename: Elena
authors.initials: E
authors.lastname: Falqué
authors.forename: Herminia
authors.initials: H
authors.lastname: Domínguez
authors.forename: María José
authors.initials: MJ
authors.lastname: Núñez
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Parajó
mesh_terms: D000327:Adsorption; D052160:Benzothiazoles / Q000737:chemistry; D002241:Carbohydrates / Q000737:chemistry / Q000302:isolation & purification; D000431:Ethanol / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification*; D007700:Kinetics; D059625:Liquid-Liquid Extraction / Q000379:methods; D008956:Models, Chemical; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification*; D059027:Recycling / Q000379:methods*; D012044:Regression Analysis; D012997:Solvents / Q000737:chemistry; D013451:Sulfonic Acids / Q000737:chemistry; D027843:Vitis / Q000737:chemistry; D014920:Wine
chemical_list: D052160:Benzothiazoles; D002241:Carbohydrates; D016166:Free Radical Scavengers; D010636:Phenols; D010936:Plant Extracts; D012997:Solvents; D013451:Sulfonic Acids; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; D000431:Ethanol