Bazus A, Rigal L, Gaset A, Fontaine T, Wieruszeski J M, Fournet B
Laboratoire de Chimie des Agroressources, Ecole Nationale Supérieure de Chimie de Toulouse, France.
Carbohydr Res. 1993 May 7;243(2):323-32. doi: 10.1016/0008-6215(93)87036-r.
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.
