title: Flaxseed hull: Chemical composition and antioxidant activity during development.
abstract: Changes in the chemical composition and antioxidant activity of flaxseed hull during maturation were investigated. P129 hull variety was studied at four maturation stages (St1, St2, St3, and St4). Significant variation in proximate composition and flaxseed hull oil characteristics were observed. A significant increase in the carbohydrates content of the hull was observed during development. The main methyl esters were linolenic acid (48.95 - 51.52 %), oleic acid (20.27-23.41%) and linoleic acid (15.62-17.70%). The highest polyunsaturated fatty acids (PUFA) were found to be 67.14 % at the first stage of maturity (St1). Flaxseed hull oil was of good quality, containing an abundance of omega-3 essential fatty acids. The iodine value increased, while the saponification value of oil decreased during seed development. The decrease in ascorbic acid content was steady. The maximum level of total phenolic acid content (128.3 mg/100 g oil) was reached at 7 DAF. The antioxidant activity of oilseed was assessed by means of 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical-scavenging assay. Radical scavenging activity for green hull was 52.74% and mature hull was 69.32%.
authors.affiliation: Laboratoire de Biochimie des Lipides, Département de Biologie, Faculté des Sciences de Tunis.
authors.forename: Wahid
authors.initials: W
authors.lastname: Herchi
authors.forename: Abdullah D
authors.initials: AD
authors.lastname: Al Hujaili
authors.forename: Faouzi
authors.initials: F
authors.lastname: Sakouhi
authors.forename: Khaled
authors.initials: K
authors.lastname: Sebei
authors.forename: Hajer
authors.initials: H
authors.lastname: Trabelsi
authors.forename: Habib
authors.initials: H
authors.lastname: Kallel
authors.forename: Sadok
authors.initials: S
authors.lastname: Boukhchina
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D001205:Ascorbic Acid / Q000032:analysis; D002241:Carbohydrates / Q000032:analysis; D055598:Chemical Phenomena; D015525:Fatty Acids, Omega-3 / Q000032:analysis*; D005231:Fatty Acids, Unsaturated / Q000032:analysis*; D019597:Flax / Q000737:chemistry* / Q000254:growth & development*; D016166:Free Radical Scavengers / Q000032:analysis; D062385:Hydroxybenzoates / Q000032:analysis; D019787:Linoleic Acid / Q000032:analysis; D008043:Linseed Oil / Q000737:chemistry*; D019301:Oleic Acid / Q000032:analysis; D017962:alpha-Linolenic Acid / Q000032:analysis
chemical_list: D000975:Antioxidants; D002241:Carbohydrates; D015525:Fatty Acids, Omega-3; D005231:Fatty Acids, Unsaturated; D016166:Free Radical Scavengers; D062385:Hydroxybenzoates; D017962:alpha-Linolenic Acid; D019301:Oleic Acid; D008043:Linseed Oil; D019787:Linoleic Acid; C017616:phenolic acid; D001205:Ascorbic Acid