Adsorption of cationized barley husk xylan on kraft pulp fibres: influence of degree of cationization on adsorption characteristics
作者： Tobias Köhnke , Harald Brelid , Gunnar Westman
DOI: 10.1007/S10570-009-9341-X
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摘要: A water-soluble (glucurono)arabinoxylan (GAX) was isolated from barley husk using chlorite delignification followed by alkaline extraction and enzymatic purification of the extract. The xylan shown to adsorb on bleached softwood kraft fibres, but degree adsorption rather low under applied conditions. This can be explained inhibited GAX molecules with a relatively high arabinofuranosyl substitution, as indicated iodine complexation neutral carbohydrate analysis non-adsorbing xylans. In order increase driving force for more highly substituted GAX, cationized through reaction in an aqueous medium 2,3-epoxypropyltrimethylammonium chloride (EPTMAC). chemical modification confirmed 1H-13C HSQC (Heteronuclear Single Quantum Coherence) NMR, quantified elemental analysis. cationization, which introduced cationic charge densities ranging 110 740 μeq/g, rate magnitude extensively, due induced electrostatic interaction between anionic fibres xylan. Similar non-modified xylan, possessed non-electrostatic cellulose surface affinity, at ionic-strength esterified (carboxyl-free) pulp fibres.
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