Biomaterial Database

Alkaline peroxide mechanical pulping of wheat straw with enzyme treatment. 2004

Jian Zhao, and Xuezhi Li, and Yinbo Qu, and Peiji Gao

State Key Laboratory of Microbial Technology, Shandong University, Jinan, 250100, P.R. China.

Alkaline peroxide mechanical pulping (APMP) of wheat straw with enzyme treatment was studied. Instead of direct enzyme pretreatment on wheat straw, an alternative treatment method was used, in which coarse pulps from refiner defibrated wheat straw rather than wheat straw were pretreated with a crude enzyme containing mainly xylanase, then impregnated with alkaline H2O2 solution and further refined. The optimum conditions of enzyme treatment were xylanase dosage of 10-15 IU/g of oven-dried wheat straw, 90 min, 50-60 degrees C, pulp consistency of 5-10%, and initial pH of 5.0, and those for chemical impregnation were 6% NaOH, 70-80 degrees C, 60-90 min, and 4 to 5% H2O2. Enzyme treatment improved pulpability of wheat straw by the APMP process, and final pulp quality such as brightness, breaking length, and burst index of pulp. Pulp from the APMP process with enzyme treatment could be bleached to a brightness of 70.5% ISO by two-stage H2O2 bleaching sequence with only 4% H2O2, and breaking length of the bleach pulp reached 4470 m

UI	MeSH Term	Description	Entries
D010209	Paper	Thin sheets made from wood pulp and other fibrous substances, used for writing, drawing, printing, image duplication or wrapping.	Papers
D006861	Hydrogen Peroxide	A strong oxidizing agent used in aqueous solution as a ripening agent, bleach, and topical anti-infective. It is relatively unstable and solutions deteriorate over time unless stabilized by the addition of acetanilide or similar organic materials.	Hydrogen Peroxide (H2O2),Hydroperoxide,Oxydol,Perhydrol,Superoxol,Peroxide, Hydrogen
D000468	Alkalies	Usually a hydroxide of lithium, sodium, potassium, rubidium or cesium, but also the carbonates of these metals, ammonia, and the amines. (Grant & Hackh's Chemical Dictionary, 5th ed)	Alkali,Alkalis
D001234	Aspergillus niger	An imperfect fungus causing smut or black mold of several fruits and vegetables such as grapes, apricots, onions, and peanuts, and is a common contaminant of food.	Aspergillus lacticoffeatus
D001709	Biotechnology	Body of knowledge related to the use of organisms, cells or cell-derived constituents for the purpose of developing products which are technically, scientifically and clinically useful. Alteration of biologic function at the molecular level (i.e., GENETIC ENGINEERING) is a central focus; laboratory methods used include TRANSFECTION and CLONING technologies, sequence and structure analysis algorithms, computer databases, and gene and protein structure function analysis and prediction.	Biotechnologies
D014908	Triticum	A plant genus of the family POACEAE that is the source of EDIBLE GRAIN. A hybrid with rye (SECALE CEREALE) is called TRITICALE. The seed is ground into FLOUR and used to make BREAD, and is the source of WHEAT GERM AGGLUTININS.	Wheat,Durum Wheat,Triticum aestivum,Triticum durum,Triticum spelta,Triticum turgidum,Triticum turgidum subsp. durum,Triticum vulgare,Durum Wheats,Wheat, Durum
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
D035261	Plant Components, Aerial	The above-ground plant without the roots.	Aerial Parts, Plant,Aerial Plant Components,Aerial Part, Plant,Aerial Plant Component,Component, Aerial Plant,Components, Aerial Plant,Part, Plant Aerial,Parts, Plant Aerial,Plant Aerial Part,Plant Aerial Parts,Plant Component, Aerial