title: Structural Variation and Content of Arabinoxylans in Endosperm and Bran of Durum Wheat (Triticum turgidum L.).
abstract: Arabinoxylans are one group of dietary fiber components in cereal grains, and specific health benefits have been linked with their molecular fine structures and hence with physicochemical properties such as solubility in aqueous media. To characterize the fiber quality for functional foods, starchy endosperm and bran fractions from 11 durum wheat lines were analyzed for total and water-soluble arabinoxylans, (1,3;1,4)-β-glucan, and bound ferulic acid. The arabinoxylan contents ranged from 11 to 16.4% (w/w) in bran and from 1.5 to 1.8% in the starchy endosperm. Of the starchy endosperm arabinoxylans, 37% was soluble in water. No correlation was found between arabinoxylan content and bound ferulic acid in bran, although a relatively high level of this antioxidant was found in endosperm (38.3 μg/g endosperm flour). Enzymatic fingerprinting was performed to define the major fine structural features of arabinoxylans from both regions of the grain. Five major oligosaccharides released by xylanase hydrolysis were identified and characterized in the 11 durum lines. In addition, DP5, DP6, and DP7 oligosaccharides containing five, six, and seven pentosyl residues, respectively, were purified.
authors.affiliation: Department of Soil, Plant and Food Sciences, Section of Genetics and Plant Breeding, University of Bari 'Aldo Moro' , Via G. Amendola 165/A, 70126 Bari, Italy.
authors.forename: Ilaria
authors.initials: I
authors.lastname: Marcotuli
authors.affiliation: Australian Research Council Centre of Excellence in Plant Cell Walls, School of Agriculture, Food and Wine, University of Adelaide , Waite Campus, Glen Osmond, SA 5064, Australia.|Division of Glycoscience, School of Biotechnology, Royal Institute of Technology (KTH), AlbaNova University Centre , Stockholm SE-10691, Sweden.
authors.forename: Yves S-Y
authors.initials: YS
authors.lastname: Hsieh
authors.affiliation: Australian Research Council Centre of Excellence in Plant Cell Walls, School of Agriculture, Food and Wine, University of Adelaide , Waite Campus, Glen Osmond, SA 5064, Australia.
authors.forename: Jelle
authors.initials: J
authors.lastname: Lahnstein
authors.affiliation: Australian Research Council Centre of Excellence in Plant Cell Walls, School of Agriculture, Food and Wine, University of Adelaide , Waite Campus, Glen Osmond, SA 5064, Australia.
authors.forename: Kuok
authors.initials: K
authors.lastname: Yap
authors.affiliation: Australian Research Council Centre of Excellence in Plant Cell Walls, School of Agriculture, Food and Wine, University of Adelaide , Waite Campus, Glen Osmond, SA 5064, Australia.
authors.forename: Rachel Anita
authors.initials: RA
authors.lastname: Burton
authors.affiliation: Division of Glycoscience, School of Biotechnology, Royal Institute of Technology (KTH), AlbaNova University Centre , Stockholm SE-10691, Sweden.
authors.forename: Antonio
authors.initials: A
authors.lastname: Blanco
authors.affiliation: Australian Research Council Centre of Excellence in Plant Cell Walls, School of Agriculture, Food and Wine, University of Adelaide , Waite Campus, Glen Osmond, SA 5064, Australia.
authors.forename: Geoffrey Bruce
authors.initials: GB
authors.lastname: Fincher
authors.affiliation: Department of Agricultural and Environmental Science, University of Bari 'Aldo Moro' , Via G. Amendola 165/A, 70126 Bari, Italy.
authors.forename: Agata
authors.initials: A
authors.lastname: Gadaleta
mesh_terms: D004043:Dietary Fiber / Q000032:analysis; D056625:Endosperm / Q000737:chemistry* / Q000378:metabolism; D012639:Seeds / Q000737:chemistry / Q000378:metabolism; D014908:Triticum / Q000737:chemistry* / Q000378:metabolism; D014990:Xylans / Q000737:chemistry* / Q000378:metabolism
chemical_list: D004043:Dietary Fiber; D014990:Xylans; C085118:arabinoxylan
keywords: arabinoxylan structure; cell walls; dietary fiber; oligosaccharides; polysaccharides