title: Antioxidants from barley husks impregnated in films of low-density polyethylene and their effect over lipid deterioration of frozen cod (Gadus morhua).
abstract: BACKGROUND
  The changes in quality of cod fillets packaged in films with and without antioxidants during 12 months of frozen storage at - 20 °C were investigated in the present study. The following parameters were determined in order to study lipid hydrolysis and primary and secondary lipid oxidation in the samples during frozen storage: peroxide value, conjugated dienes, conjugated triene hydroperoxides, free fatty acids, totox value, thiobarbituric acid-reactive substances and p-anisidine value.
  
  
  RESULTS
  Films containing antioxidants isolated from barley husks were effective in slowing down lipid hydrolysis and primary and secondary lipid oxidation processes. Secondary lipid oxidation reached maximum values in the 12th month of storage in control samples and samples packaged with antioxidant-containing film. Maximum lipid hydrolysis and lipid oxidation values for control cod samples were significantly higher than the maximum values found in samples packaged with antioxidant-containing film.
  
  
  CONCLUSIONS
  The results confirm the efficacy of natural antioxidants derived from barley husks in slowing down lipid hydrolysis and increasing the oxidative stability of cod flesh. They also demonstrate the potential usefulness of natural antioxidants extracted from barley husks in the development of active packaging films for food preservation.
authors.affiliation: Department of Chemical Engineering, ETSEI, University of Vigo, 36200 Vigo, Spain.
authors.forename: David A Pereira
authors.initials: DA
authors.lastname: de Abreu
authors.forename: Julio
authors.initials: J
authors.lastname: Maroto
authors.forename: Karen Villalba
authors.initials: KV
authors.lastname: Rodríguez
authors.forename: José M
authors.initials: JM
authors.lastname: Cruz
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry*; D018857:Food Packaging; D061353:Food Storage; D005615:Freezing; D048389:Gadus morhua; D001467:Hordeum / Q000737:chemistry*; D008055:Lipids / Q000737:chemistry; D008422:Materials Testing; D020959:Polyethylene / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D008055:Lipids; D020959:Polyethylene