Modification of xylan via an oxidation–reduction reaction
Journal article, 2022

Xylan is a biopolymer readily available from forest resources. Various modification methods, including oxidation with sodium periodate, have been shown to facilitate the engineering applications of xylan. However, modification procedures are often optimized for semicrystalline high molecular weight polysaccharide cellulose rather than for lower molecular weight and amorphous polysaccharide xylan. This paper elucidates the procedure for the periodate oxidation of xylan into dialdehyde xylan and its further reduction into a dialcohol form and is focused on the modification work up. The oxidation–reduction reaction decreased the molecular weight of xylan while increased the dispersity more than 50%. Unlike the unmodified xylan, all the modified grades could be solubilized in water, which we see essential for facilitating the future engineering applications of xylan. The selection of quenching and purification procedures and pH-adjustment of the reduction step had no significant effect on the degree of oxidation, molecular weight and only a minor effect on the hydrodynamic radius in water. Hence, it is possible to choose the simplest oxidation-reduction route without time consuming purification steps within the sequence.

Hydrodynamic radius

Solubilization

Molecular weight

Polysaccharides

Dialcohol xylan

Author

Chonnipa Palasingh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Koyuru Nakayama

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Felix Abik

University of Helsinki

Kirsi S. Mikkonen

University of Helsinki

Lars Evenäs

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Wallenberg Wood Science Center (WWSC)

Anna Ström

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Tiina Nypelö

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Wallenberg Wood Science Center (WWSC)

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 292 119660

Liberation and solution properties of wood hemicelluloses towards surface active molecules (HEMISURF).

Nordic Forest Research (SNS) (HEMISURF), 2019-01-01 -- 2021-12-31.

Oxiderad hemicellulosa för filmer och geler

Swedish Research Council (VR) (2017-05138), 2018-01-01 -- 2021-12-31.

Subject Categories

Polymer Chemistry

Paper, Pulp and Fiber Technology

Polymer Technologies

DOI

10.1016/j.carbpol.2022.119660

PubMed

35725206

More information

Latest update

3/30/2023