Effects of Xylanase Pretreatment on the Quality of Refiner Mechanical Mulberry Branch Fibers

Tao, Wenjuan; Guo, Lei; Meng, Aojie; Wang, Lizhen; Ren, Hao; Zhai, Huamin

doi:10.1155/2019/6252013

Cited by 9 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different amounts of hemicelluloses may also be responsible for the differences in the performance of EnzB as this enzyme formulation also exhibited a high xylanase activity, while filter paper only exhibits low amounts of hemicelluloses. Several studies have reported that xylanases contribute positively to refining of pulps in terms of energy reduction (Tao et al 2019). Despite the successful demonstration of the effectiveness of energy reduction by xylanases, their use can also affect the paper properties like tensile strength negatively by the removal of xylan (Miletzky et al 2015;K.…”

Section: Comparison Of Refining Enzyme Formulationsmentioning

confidence: 99%

Biorefining: the role of endoglucanases in refining of cellulose fibers

et al. 2021

View full text Add to dashboard Cite

With an annual production of more than 400 million tons, paper is the main product of the largest biorefinery process industrially implemented. Enzymes have been used for pulp refining to dramatically reduce energy consumption. However, exact mechanisms related to the individual enzymes are hardly understood. Yet, this knowledge would be important to predict enzyme performance in industrial processes. Three commercial refining enzyme formulations showed different endoglucanase (1.25 nkat mg−1–13.7 nkat mg−1), β-glucosidase (0.57 nkat mg−1–1.34 nkat mg−1) and xylanase activities (1.78 nkat ml−1–62.1 nkat mg−1) on model substrates. Additionally, distinct amounts of reducing sugars from hardwood sulfate pulp were released. Endoglucases were purified from each formulation by using hydrophobic interaction and anion exchange chromatography and showed molecular weights from 20 to 55 kDa and specific activities ranging between 3.11 and 26.3 nkat mg−1 according to endoglucanase specific derivatized cellopentaose (CellG5). Refining trials of hardwood sulfate pulp were conducted using a PFI laboratory mill and fiber properties such as degree of refining or fiber length and properties of formed sheets like tensile index were monitored. Thereby, enzymes were dosed based on identical endoglucanase activity on CellG5. Enzyme formulations and purified endoglucanases led to an increase of the degree of refining of up to 47.9 [°SR] at 6000 PFI revolutions while the tensile index was improved by up to 76.0 Nm g−1. In summary, refining effects can be primarily attributed to endoglucanases indicating activity on CellG5 being a suitable parameter for enzyme dosing.

show abstract

Section: Comparison Of Refining Enzyme Formulationsmentioning

confidence: 99%

Biorefining: the role of endoglucanases in refining of cellulose fibers

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Microorganism-derived xylanases might be useful in the feed, food, wastepaper, and various agricultural sectors [11,12]. Xylanase has been shown to save energy and improve yield and pulp properties in biomechanical pulping processes, through pre-treatment of pulps before bleaching in the pulp and paper industry [13,14]. Recently, ink from effluent generated from paper and pulp industries can be remove by using xylanase and laccase enzymes [15].…”

Section: Introductionmentioning

confidence: 99%

Xylanase from thermotolerant Bacillus haynesii strain, synthesis, characterization, optimization using Box-Behnken Design, and biobleaching activity

Bakry

Salem

Atta

et al. 2022

Biomass Conv. Bioref.

View full text Add to dashboard Cite

The economic value of xylanolytic enzymes is derived from their use in a variety of industrial processes, which necessitates a cost-effective manufacturing procedure. In the current study, forty bacterial isolates were isolated from water samples and investigate their efficacy to producing xylanase enzyme. The most potent bacterial isolate was identified by sequencing and amplifications of 16Sr RNA gene as Bacillus haynesii strain K6. The impacts of various culture conditions on the productivity of xylane were examined. Data showed that the highest xylanase production was achieved at pH 7, in presence of 3 g/L xylan, 5 g/L peptone, and incubated at 40 °C for 24 h. The Box-Behnken model was used to find the best parameters for the relevant variables, and the results revealed an increase in xylanase production with values of 35.02 U/mL. The maximum precipitation of xylanase from the optimized culture was attained by ammonium sulfate (60%) followed by purification using dialysis and sephadex G100 column chromatography. The purified xylanase had a 12-fold enrichment, with a specific activity of 84 U/mg and a molecular weight approximately 439 KDa determined by thin-layer chromatography (TLC)/mass spectrometry. The amino acid analysis of the purified xylanase enzyme revealed the presence of 15 amino acids, with the highest concentrations of 1940 and 1520 mg/L for proline and cysteine, respectively. Finally, the physical properties of wastepaper pulp were improved after treatment with xylanase enzyme. The whiteness and softness of xylanase-treated wastepaper were improved with percentages of 34.6% and 16.2%, respectively. Therefore, we recommend the use of xylanase enzyme in the bleaching process as it is a biologically synthetic material, safe, and suitable for industrial use, and it reduces the use of harmful chemicals.

show abstract

“…Further, the fiber widths increased because of the improved swelling effect of the xylanase pretreatment. In some instances, the fine elements were reduced (Tao et al 2019). Poplar wood is a fast-growing hardwood species.…”

Section: Introductionmentioning

confidence: 99%

Effect of xylanase pretreatment on the kraft pulping of poplar

Akgül

Gücüş

Üner

et al. 2020

BioRes

View full text Add to dashboard Cite

This study aimed to determine the influence of prehydrolysis of wood chips on the kraft pulping of Populus x euramericana. Optimum cooking conditions were determined by evaluating different alkali concentrations and cooking periods. Xylanase was used to hydrolyze chips before cooking. Prehydrolysis process increased the yield and viscosity of pulp. Consequently, the mechanical properties of paper changed remarkably. In contrast, the optical properties of the unbleached kraft pulp declined due to lignin content.

show abstract

Effects of Xylanase Pretreatment on the Quality of Refiner Mechanical Mulberry Branch Fibers

Cited by 9 publications

References 33 publications

Biorefining: the role of endoglucanases in refining of cellulose fibers

Biorefining: the role of endoglucanases in refining of cellulose fibers

Xylanase from thermotolerant Bacillus haynesii strain, synthesis, characterization, optimization using Box-Behnken Design, and biobleaching activity

Effect of xylanase pretreatment on the kraft pulping of poplar

Contact Info

Product

Resources

About