title: Isolation and characterisation of hemicelluloses from sunflower hulls.
abstract: The hemicelluloses extracted from sunflower hulls by repeated alternating oxidative and alkaline treatments were purified by precipitation with Cetavlon and then ion-exchange chromatography on DEAE-trisacryl. The resulting fractions were examined by hydrolysis, methylation, GLC-MS, and NMR spectroscopy. The hemicelluloses are of the glucuronoxylan type with the following structure -->4)-beta-D-Xylp-(1-->4)-[4-O-Me-alpha-D-GlcpA-(1-->2)]-bet a-D-Xylp-(1-->. The polysaccharides differed in the amount of branching; the ratio of the main fraction 4-O-MeGlcA:Xyl was 1:8-9.
authors.affiliation: Laboratoire de Chimie des Agroressources, Ecole Nationale Supérieure de Chimie de Toulouse, France.
authors.forename: A
authors.initials: A
authors.lastname: Bazus
authors.forename: L
authors.initials: L
authors.lastname: Rigal
authors.forename: A
authors.initials: A
authors.lastname: Gaset
authors.forename: T
authors.initials: T
authors.lastname: Fontaine
authors.forename: J M
authors.initials: JM
authors.lastname: Wieruszeski
authors.forename: B
authors.initials: B
authors.lastname: Fournet
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D008401:Gas Chromatography-Mass Spectrometry; D006368:Helianthus / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008969:Molecular Sequence Data; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D012639:Seeds / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D011134:Polysaccharides; C007916:hemicellulose