Mechanisms for kappa reduction and color removal by xylanases

Thomas W. Jeffries; Mark Davis; Brian Rosin; Larry L. Landucci

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Mechanisms for kappa reduction and color removal by xylanases

Informally Refereed

Authors:

Thomas W. Jeffries, Mark Davis, Brian Rosin, Larry L. Landucci

Year:

1998

Type:

Miscellaneous Publication

Station:

Forest Products Laboratory

Source:

7th International Conference on Biotechnology in the Pulp and Paper Industry : Vancouver, BC, Canada, June 16-19, 1998. Poster presentations, Vol. C. Montreal, Quebec : Technical Section, CPPA, 1998.:p. C41-C43.

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Abstract

Xylanases reduce kappa and release UV- and visibly absorptive materials from kraft pulps. The extents of these actions depend on the origin and processing of the pulp, access of enzymes to the substrate, and the natures of the enzymes. Hexeneuronic acid (HexA) is a component of kraft pulp xylans that accounts for a fraction of the kappa content. It absorbs strongly in the UV region (235 nm), and its release can be used to monitor xylanase activity. This report shows that HexA release correlates closely with release of xylooligo-saccharides, but not with the reduction in kappa.

Keywords

Sulfate pulping, Xylan, Bleaching, Enzymes, Color, Ultraviolet radiation, Nuclear magnetic resonance, Kappa reduction, Hexeneuronic acid

Citation

Jeffries, Thomas W.; Davis, Mark.; Rosin, Brian.; Landucci, Larry L. 1998. Mechanisms for kappa reduction and color removal by xylanases. 7th International Conference on Biotechnology in the Pulp and Paper Industry : Vancouver, BC, Canada, June 16-19, 1998. Poster presentations, Vol. C. Montreal, Quebec : Technical Section, CPPA, 1998.:p. C41-C43.