Biomaterial Database

Modification of high-lignin kraft pulps with laccase. Part 2. Xylanase-enhanced strength benefits. 2005

Richard P Chandra, and Arthur J Ragauskas

School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th St. NW, Atlanta, GA 30332, USA.

The effects of xylanase pretreatment of high lignin content softwood (SW) kraft pulp on subsequent pulp treatment with laccase in combination with gallic acid were investigated. Although xylanase pretreatment was ineffective in enhancing the laccase-facilitated biografting of gallic acid to kraft fibers, it was beneficial for subsequent treatment with laccase exclusively. Treating pulp fibers with xylanase followed by laccase provided a collective 25% and 46% increase in dry and wet tensile strength properties, respectively.

UI	MeSH Term	Description	Entries
D008031	Lignin	The most abundant natural aromatic organic polymer found in all vascular plants. Lignin together with cellulose and hemicellulose are the major cell wall components of the fibers of all wood and grass species. Lignin is composed of coniferyl, p-coumaryl, and sinapyl alcohols in varying ratios in different plant species. (From Merck Index, 11th ed)	Lignins
D005707	Gallic Acid	A colorless or slightly yellow crystalline compound obtained from nutgalls. It is used in photography, pharmaceuticals, and as an analytical reagent.	3,4,5-Trihydroxybenzoic Acid,Acid, Gallic
D014934	Wood	A product of hard secondary xylem composed of CELLULOSE, hemicellulose, and LIGNANS, that is under the bark of trees and shrubs. It is used in construction and as a source of CHARCOAL and many other products.	Woods
D042845	Laccase	A copper-containing oxidoreductase enzyme that catalyzes the oxidation of 4-benzenediol to 4-benzosemiquinone. It also has activity towards a variety of O-quinols and P-quinols. It primarily found in FUNGI and is involved in LIGNIN degradation, pigment biosynthesis and detoxification of lignin-derived products.	Laccase B,Laccase I,Laccase II,Laccase III,Urishiol Oxidase,p-Diphenol Oxidase,Oxidase, Urishiol,Oxidase, p-Diphenol,p Diphenol Oxidase
D043364	Endo-1,4-beta Xylanases	Enzymes which catalyze the endohydrolysis of 1,4-beta-D-xylosidic linkages in XYLANS.	Endo-1,4-beta-Xylanase,1,4-beta-D-Xylanohydrolase,Beta-1-4-Endoxylanase,Endo-1,4-Xylanase II,Endo-1,4-beta-Xylanase II,Endoxylanase,Xylanase A,Xylanase B,Xylanase C,Xylanase D,Xylanase J,Xylanase Y,Xylanase Z,beta Xylanase,1,4 beta D Xylanohydrolase,Beta 1 4 Endoxylanase,Endo 1,4 Xylanase II,Endo 1,4 beta Xylanase,Endo 1,4 beta Xylanase II,Endo 1,4 beta Xylanases,Xylanase, beta,Xylanases, Endo-1,4-beta