Modification of xylan

a technology of xylan and xylan, which is applied in the field of enzymatically modifying xylan, can solve the problems of reduced pulp yield, environmental hazard, and reduced fibre strength, and achieve the effect of reducing the water solubility of the modified xylan

Inactive Publication Date: 2013-09-12
STELLENBOSCH UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017]A sufficient number of side chains may be removed from the

Problems solved by technology

However, because xylan is soluble, an undesirable side effect of this process is that xylan is removed along with the lignin, resulting in reduced pulp yields and reduced fibre strength.
Not only is this a waste of a valuable resource, but it is also an environmental hazard, as the degraded xylans release organic acids and chromophogenic compounds which, when coupled with large amounts of chemical discharges from the kraft process, increase the COD loading

Method used

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  • Modification of xylan
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  • Modification of xylan

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examples

[0077]The invention will now be described in more detail by way of the following non-limiting examples. Although only cotton lint is used as a substrate onto which the modified xylan can be adsorbed, it will be apparent to a person skilled in the art that the modified xylan could also be adsorbed onto other substrates.

Material and Methods

Materials

[0078]Mild alkali extracted xylan from Saccharum officinarum L (sugarcane) bagasse (BH), Bambusidae balcooa [giant bamboo (BM)], Eucalyptus grandis, [Eucalyptus (EH)], Pinus patula [Pine (PP)] (extracted using a mild alkali method described by Höije et al. [2005 Carbohydr. Polym. 61: 266-275]), commercial oatspelt xylan (Sigma), birch xylan (Roth), mild alkali H2O2 bleached xylan from bagasse (BB) (donated by Prof. A. M. F. Milagres, University of Sáo Paulo, Brazil) and xylan gel from E. grandis (ES) (donated by SAPPI—Pretoria, South Africa) were used in the experiments.

[0079]Xylan solutions (1% w / v) were prepared according to de Wet et al....

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Abstract

The invention provides a method of modifying soluble xylan which contains glucuronic acid and/or arabinose side chains so that it can be adsorbed onto other substrates. The method includes the steps of enzymatically modifying the xylan by selectively removing glucuronic acid and/or arabinose side chains from the xylan with α-D-glucuronidase and/or α-L-arabinofuranosidase, and allowing the modified xylan to adsorb onto the substrate. The substrate may be a cellulosic substrate like pulp or paper or a non-cellulosic substrate. The enzymes are able to remove a sufficient number of the xylan side chains so as to decrease water solubility of the xylan, induce xylan precipitation and allow adsorption of the xylan onto other substrates. A pulping process which incorporates modification of xylan and adsorption onto cellulosic material is also provided, as are products which contain the modified xylan.

Description

FIELD OF THE INVENTION[0001]This invention describes a method for enzymatically modifying xylan so that it can be adsorbed or coated onto a substrate, a product comprising modified xylan adsorbed or coated onto the substrate and a pulping process incorporating the method.BACKGROUND TO THE INVENTION[0002]The principal components of plant biomass are lignin, cellulose and hemicellulose. Cellulose in the plant cell wall is present in close association with hemicellulose in a matrix encrusted by lignin. One of the major hemicelluloses in most plant cell walls is xylan. Xylan is a polymer consisting of a 1,4-β-linked D-xylose backbone chain substituted with L-arabinose, D-glucuronic acid or both and various short oligosaccharide chains consisting of D-xylose, -L-arabinose, galactose, glucuronic acid, and O-acetyl groups. Depending on the plant biomass source, morphological plant part and physiological stages of plant maturity, the xylan contained therein may also contain feruloyl and p-c...

Claims

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Application Information

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IPC IPC(8): D21H17/24
CPCC09D105/14C12P19/04C12P2203/00D21H17/24C12Y302/01139D21C9/005D21H11/20C12Y302/01055
Inventor VAN ZYL, WILLEM HEBERCHIMPHANGO, ANNIE FABIAN ABELGORGENS, JOHANN FERDINAND
Owner STELLENBOSCH UNIVERSITY
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