The effect of xylanase on the fine structure of a bleached kraft softwood pulp
Source abstract
Abstract
Abstract In this paper, X1 and X2 (two different xylanases), were employed to pretreat oxygen-delignified kraft softwood pulp. X2 could handle unwashed pulp, while X1 needed washed pulp. Subsequently, the effects of two xylanases on the physical properties, microstructure and fiber characteristics of pulp were investigated. Compared to the ECF bleached pulp (OD0EpD1), the brightness (86.9 %ISO), tensile index (28.4 N·m/g) and burst index (1.67 kPa·m2/g) of the ECF bleached pulp treated with X2 xylanase (9 U/g) increased by 2.4 %ISO, 4.8 % and 24.6 %. After X2 xylanase pretreatment, the fiber length of pulp decreased slightly, the content of fine fibers increased, and the water retention value increased. Due to the pretreatment of X2 xylanase, some non-fibrous components and chromophores in the pulp were removed, and the intrinsic viscosity and average molecular weight of the pulp were reduced. The crystallinity of cellulose decreases by 1 %, the fiber surface becomes rough, and voids are created, the specific surface area increases, and the average pore size increases. These findings suggest that enzyme pretreatment is a green and highly effective approach that not only significantly enhances pulping performance but also demonstrates excellent adaptability to complex processing environments and it streamlines the traditional pulping process effectively.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Lignin and Wood Chemistry · Advanced Cellulose Research Studies · Biofuel production and bioconversion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Biobased Fiber Manufacturing Technology , 66345 Tianjin University of Science and Technology , Tianjin , 300457 , P.R. China
Tianjin Key Laboratory of Pulp and Paper , 66345 Tianjin University of Science and Technology , Tianjin , 300457 , P.R. China
China Light Industry Key Laboratory of Papermaking and Biorefinery , 66345 Tianjin University of Science and Technology , Tianjin , 300457 , P.R. China
Funding
China Postdoctoral Science Foundation funded project · National Natural Science Foundation of China · National Key Research and Development Program of China
References (47)
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