title: Xylanase Treatment Suppresses Light- and Heat-Induced Yellowing of Pulp.
abstract: Xylanase is commonly applied in pulp and paper industries to ease cost-related and environmental pressures. The effect of xylanase treatment on pulp bleaching is well-established, however, few studies were conducted on the effects of xylanase treatment in pulp yellowing, especially the mechanism of pulp yellowing inhibition by xylanase treatment. In this study, pure xylanase (EC 3.2.1.8) was applied to treat wheat straw chemical pulp (CP) and poplar chemi-thermo-mechanical pulp (CTMP) to determine their effects on pulp brightness and on light- and heat-induced yellowing. The xylanase treatment decreased the post-color number of the pulps during light- and heat-induced yellowing. However, differences were observed in the yellowing inhibition between the wheat straw CP and poplar CTMP. The changes in chemical components of pulps after the xylanase treatment, for example, lignin, hemicellulose, and HexA contents, and analysis of UV-vis absorption spectra and Fourier transform infrared-attenuated total reflectance spectrum were used to explore the pulp yellowing inhibition causes by the xylanase treatment.
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Ji-nan City, Shandong Province, 250100, P. R. China.
authors.forename: Daolei
authors.initials: D
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Ji-nan City, Shandong Province, 250100, P. R. China.
authors.forename: Xuezhi
authors.initials: X
authors.lastname: Li
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Ji-nan City, Shandong Province, 250100, P. R. China.
authors.forename: Meimei
authors.initials: M
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Ji-nan City, Shandong Province, 250100, P. R. China.
authors.forename: Yanxin
authors.initials: Y
authors.lastname: Ye
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Ji-nan City, Shandong Province, 250100, P. R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Du
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Ji-nan City, Shandong Province, 250100, P. R. China.
authors.forename: Xianqin
authors.initials: X
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Microbial Technology, Shandong University, Ji-nan City, Shandong Province, 250100, P. R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhao
mesh_terms: D018533:Biomass; D003116:Color; D043364:Endo-1,4-beta Xylanases / Q000737:chemistry*; D005656:Fungal Proteins / Q000737:chemistry*; D006358:Hot Temperature; D008027:Light; D008031:Lignin / Q000737:chemistry*; D031567:Liriodendron / Q000737:chemistry*; D010209:Paper; D055668:Photochemical Processes; D018547:Plant Stems / Q000737:chemistry; D014908:Triticum / Q000737:chemistry*
chemical_list: D005656:Fungal Proteins; D008031:Lignin; D043364:Endo-1,4-beta Xylanases