Flax (Linum usitatissimum) seed cake: a potential source of high molecular weight arabinoxylans?
Water-soluble polysaccharides were extracted from flaxseed cake and analyzed. Two groups were separated by anion-exchange chromatography. The first one (nonretained) was the major fraction (83%) and possessed a high molecular weight (HMW) arabinoxylan (56%) with an Ara/Xyl ratio of 0.32 and an M(w) of 846 000. This polymer was accompanied by a smaller galactoglucan (44%), with an M(w) of 6.5 x 10(4). The latter group (17%), retained by the gel, was further described as a HMW pectin heterogeneous group, with, respectively, 3.1 x 10(5) and 1.3 x 10(5). Despite the presence of HMW arabinoxylans, the investigation of rheological flow sweep at the concentration of 2% (w/v) has shown a slight shear thinning behavior with a small zero-rate viscosity at 9.6 Pa.s.
Warrand
J
J
Laboratoire des Glucides, EPMV (CNRS-FRE 2779), IUT d'Amiens (GB), Université de Picardie Jules Verne, avenue des Facultés, Le Bailly, 80025 Amiens Cedex 1, France.
Michaud
P
P
Picton
L
L
Muller
G
G
Courtois
B
B
Ralainirina
R
R
Courtois
J
J
D002852:Chromatography, Ion Exchange; D003296:Cooking; D019597:Flax / Q000737:chemistry*; D008970:Molecular Weight; D012212:Rheology; D014783:Viscosity; D014990:Xylans / Q000737:chemistry / Q000302:isolation & purification*
D014990:Xylans; C085118:arabinoxylan