Effect of depth beating on the fiber properties and enzymatic saccharification efficiency of softwood kraft pulp. (20th August 2015)

• Record Type: Journal Article
• Authors: Gao, Wenhua; Xiang, Zhouyang; Chen, Kefu; Yang, Rendang; Yang, Fei
• Is Part Of: Carbohydrate polymers. Volume 127(2015)
• Page Start: 400
• Page End: 406
• Publication Date: 2015-08-20
• Subjects: PFI-mill beating -- Depth beating -- Enzymatic saccharification -- Fiber size reduction -- Bleached softwood kraft pulp; BSKP bleached softwood kraft pulp -- CNF cellulose nanfibrills -- SED substrate enzymatic digestibility -- WRV water retention value; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2015.04.005
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Bleached softwood kraft pulp was mechanically fibrillated by PFI-mill. The PFI-mill beaten pulp fibers were subjected to enzymatic hydrolysis. The fiber morphologies after depth PFI-mill beating or enzymatic hydrolysis were investigated. The study is important for the preparation of microfibrillated cellulose from combined mechanical and enzymatic treatments. Abstract: Commercial bleached softwood kraft pulp was mechanically fibrillated by a PFI-mill with beating revolution from 5000 to 30, 000 r. The extent of fibrillating on the pulp was evaluated by beating degree, fiber morphological properties (fiber length, width, coarseness and curls index), water retention value (WRV) and physical properties of paper made from the pulp. Depth beating process significantly affected the pulp fibrillations as showed by the decreased fiber length and width as well as the SEM analysis, but the effects were limited after beating revolution of 15, 000. Depth beating process also improved the total internal pore and inter-fibril surface areas as shown by the increased WRV values. Substrate enzymatic digestibility (SED) of beaten pulp at 5000 revolutions could reach 95% at cellulase loading of 15 FPU/g of glucan. After the enzymatic hydrolysis, the size of the pulp residues was reduced to micro-scale, and a relative uniform size distribution of the residues appeared at 10, 000 r beating revolution.