effect of barley husk arabinoxylan adsorption on the properties of cellulose fibres

effect of barley husk arabinoxylan adsorption on the properties of cellulose fibres

This study investigates the adsorption of (glucurono)arabinoxylan (GAX) on cellulose fibres and the properties thereof. A water-soluble GAX, from barley husks (Hordeum vulgare), was isolated using chlorite delignification and alkaline extraction followed by enzymatic purification. The isolated GAX f...

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Bibliographic Details
Published in:Cellulose (London) Vol. 15; no. 4; pp. 537 - 546
Main Authors: Köhnke, Tobias, Pujolras, Carla, Roubroeks, Johannes P, Gatenholm, Paul
Format: Journal Article
Language:English
Published: Dordrecht Dordrecht : Springer Netherlands 01-08-2008
Springer Netherlands
Springer Nature B.V
Subjects:
(Glucurono)arabinoxylan
Adsorption
Agglomerates
Aggregation
Arabinose
Arabinoxylans
Atomic force microscopy
Barley
Barley husk
Beatability
Bioorganic Chemistry
Bonding strength
Carbohydrates
Cellulose
Cellulose fibers
Cellulose fibre
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Extraction
Glass
Isolation
Kraft pulp
Light scattering
Molecular structure
Natural Materials
Organic Chemistry
Physical Chemistry
Polymer Sciences
Size exclusion chromatography
Softwood kraft pulp
Sustainable Development
Tensile strength
Xylose
Aggregation
Beatability
Cellulose fibre
Adsorption
Softwood kraft pulp
Isolation
Extraction
(Glucurono)arabinoxylan
Barley husk
Tensile strength
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Summary:This study investigates the adsorption of (glucurono)arabinoxylan (GAX) on cellulose fibres and the properties thereof. A water-soluble GAX, from barley husks (Hordeum vulgare), was isolated using chlorite delignification and alkaline extraction followed by enzymatic purification. The isolated GAX fraction showed an arabinose to xylose ratio of 0.22 and a weight average molar mass of 20,200 g/mol, as determined by size exclusion chromatography (SEC) in DMSO:H₂O. The GAX was adsorbed on cellulose fibres under well controlled conditions, where temperature and initial concentration of GAX proved to be important parameters in controlling the level of adsorption. The adsorption process was also dependent on xylan molecular structure. Carbohydrate analysis on the modified fibres showed a preferential adsorption of low substituted xylans (arabinose to xylose ratio of ~0.10). During the adsorption process the GAX solution was analyzed using SEC-RI-MALLS in aqueous solvent, which demonstrated a molecular xylan adsorption on cellulose fibres. Additionally, a decrease in light scattering responses, which corresponds to an adsorption of aggregated xylan and/or xylan with a great tendency towards self-association, could be observed during the adsorption process. This was demonstrated by adsorption of GAX on regenerated cellulose fibres (Lyocell), which compared to native fibres possesses a relatively smooth fibre surface. Atomic force microscopy analysis visualised a heterogeneous decoration of the Lyocell fibres with xylan agglomerates. The effect of GAX adsorption on paper strength was also investigated. A GAX modified kraft pulp showed an evident increase in tensile strength, which might be due to a retained fibre-fibre bonding ability for xylan coated fibrils after drying and rewetting.
Bibliography:http://dx.doi.org/10.1007/s10570-008-9209-5
ISSN:0969-0239
1572-882X
1572-882X
DOI:10.1007/s10570-008-9209-5