Xylanase enzyme production from Bacillus australimaris P5 for prebleaching of bamboo (Bambusa tulda) pulp

Dutta, Pallavi Dowarah; Neog, Bijoy; Goswami, Tridip

doi:10.1016/j.matchemphys.2019.122227

Cited by 28 publications

(11 citation statements)

References 35 publications

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“…Figure 1 shows the FTIR spectrum of assays 1 and 5 for the kraft pulp and assays 6 and 10 for the sulfite pulp. The differences found in the spectrum were also supported by studies by other authors (Sridevi et al 2016;Kumar et al 2018;Dutta et al 2020). The bands observed at the different wavelengths corresponded to the structural changes, as well as the cooking process used in the production of both pulps.…”

Section: Kraft and Sulfite Pulps Enzymatic Treatmentssupporting

confidence: 84%

“…The use of xylanases can produce refining energy savings and increase wet-fiber flexibility. Consequently, this can improve the inter-fiber bonding capacity by slowly decreasing the relative bonding area, improving optical brightness, and improving the physical strength properties (Spiridon et al 2003;Spiridon and Duarte 2004;Buzała et al 2016;Dutta et al 2020). Even without mechanical refining, enzymatic treatment with the mixing of both enzymes results in modified pulp properties, such as increased tear strength, clear defibrillation, reduced fiber length, and increased fines (Žnidaršič-Plazl et al 2009;Kumar et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Cellulose fiber enzymatic modification to improve the softness, strength, and absorption properties of tissue papers

Morais

Carta

Amaral

et al. 2020

BioRes

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Effects of enzymatic modification were evaluated in bleached Eucalyptus kraft and sulfite cellulosic pulps, separately, to improve key tissue paper properties and design new Eucalyptus fiber applications. Different cellulase dosages (0.01 mg and 0.1 mg of enzyme/g of pulp) and reaction times (30 min and 60 min) were used to modify the fibers and replace the traditional mechanical based refining or beating process. The results showed that for enzymatic modified kraft and sulfite pulps, the softness properties were improved by 1 and 2 units, respectively, for each unit of decreased strength properties. To achieve a balance between the tissue properties, the different fiber pulp furnishes that contained 80% of the enzymatically treated kraft pulp and 20% of the sulfite pulp with and without enzymatic treatment, were studied. Overall, the structures made with these mixtures presented softness properties in the commercial range (57.8 to 74.4), improved absorption properties (107 mm to 120 mm of capillary rise), and good strength properties (13.0 to 17.7 N.m/g). This study was conducted in order to adjust the fiber furnishes according to industrial tissue standards, using one Eucalyptus fiber type providing strength and another providing softness.

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Section: Kraft and Sulfite Pulps Enzymatic Treatmentssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Cellulose fiber enzymatic modification to improve the softness, strength, and absorption properties of tissue papers

Morais

Carta

Amaral

et al. 2020

BioRes

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“…Those values are still relatively high when compared to other enzyme producers and conditions. 24,26,27 Because BSG is an agro-industrial residue, it is a somewhat processed lignocellulosic material that thereby avoids the need for pretreatment before the enzyme production process, which should result in beneficial savings in energy and chemicals use. Hence, eliminating the dilute-acid pretreatment with HCl and using directly untreated BSG at 7% (10 g L −1 xylan equivalent) with CSL/KNO 3 supplementation for enzyme production was investigated.…”

Section: Discussionmentioning

confidence: 99%

High cellulase‐free xylanases production by Moesziomyces aphidis using low‐cost carbon and nitrogen sources

Faria

Marques

Cerejo

et al. 2022

J of Chemical Tech & Biotech

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Background: Enzymes involved in xylan hydrolysis have several industrial applications. Selection of efficient microbial hosts and scalable bioreaction operations can lower enzyme production costs and contribute to their commercial deployment. This work aims at investigating the Moesziomyces aphidis yeast cultivation conditions that deliver maximal xylanase titres, yields and productivities using low-cost nitrogen (N) and carbon (C) sources.Results: NaNO 3 and KNO 3 supplementation improved xylanase production 2.9-and 2.7-fold (against 67.2 U mL −1 ), respectively, using xylan as C source. Interestingly, the use of KNO 3 , instead of NaNO 3 , results in 2-to 3-fold higher specific activity, highlighting the potassium ion role. In addition, this study investigates synergetic effects on using ionic and organic N sources. A 4.9-fold increase in xylanase production, with high specific activity, is attained combining KNO 3 and corn steep liquor (CSL). Exploring the previous findings, this study reports one of the highest extracellular xylanase production titres (864.7 U mL −1 ) by yeasts, using a media formulation containing dilute-acid pre-treated brewery spent grains (BSG), as C source and inducer, supplemented with KNO 3 and CSL. Replacement of dilute-acid pre-treatmed BSG by untreated BSG had low impact on xylanase production, of only 6%.Conclusion: Efficient production of M. aphidis xylanolytic enzymes, using low-cost N and C sources, is attractive for deployment of on-site enzyme production targeting different biotechnological applications under circular economy and biorefinery concepts. Potential xylanases end-users include industries such as brewing (using BSG as substrate for enzyme production), pulp and paper (benefiting from the cellulase-free xylanase activity) or lignocellulosic ethanol (for cellulase supplementation).

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“…The band shifted to ~2903 cm −1 for mechanically de-structured wood chips, whereas the shifting effect was more pronounced after xylanase treatment of de-structured wood chips and reached up to ~2910. This might be due to the change in the environment around C-H bond due to removal of hemicelluloses and lignin during treatments (Chen et al 2015;Dowarah et al 2020).…”

Section: Ftir Analysismentioning

confidence: 99%

Influence of mechanical operation on the biodelignification of Leucaena leucocephala by xylanase treatment

et al. 2021

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This study aimed at energy reduction during pulping of L. leucocephala by passing the wood chips through an impressafiner followed by xylanase pretreatment. An impressafiner compressed the chips and converted them into spongy materials. Wood chips of L. leucocephala with or without de-structuring and de-structured wood chips followed by enzymatic treatment were subjected to Kraft pulping at different temperatures varying from 135 to 170 °C and active alkali varying from 12 to 20% (as Na 2 O) to observe effect on screened pulp yield and kappa number. The de-structured wood chips followed by enzymatic treatment produced a pulp yield of 48.2% and kappa number 18.6. L. leucocephala without de-structuring produced a pulp yield of 50.1% and kappa number 23.7. When the pulp was subjected to oxygen delignification to reduce kappa number in the vicinity of 18.6, pulp showed shrinkage by 6.64% compared to Kraft pulp of de-structured wood chips followed by enzymatic treatment. Kraft pulp produced from de-structured wood chips of L. leucocephala followed by enzymatic treatment showed net saving of US$ 163.15 per digester over Kraft pulp produced without de-structuring of wood chips of L. leucocephala. Moreover, the pulp obtained by de-structuring followed by enzymatic treatment showed improvement in pulp brightness and physical strength properties including tensile, tear, and burst index significantly compared to pulp obtained without de-structuring.

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Xylanase enzyme production from Bacillus australimaris P5 for prebleaching of bamboo (Bambusa tulda) pulp

Cited by 28 publications

References 35 publications

Cellulose fiber enzymatic modification to improve the softness, strength, and absorption properties of tissue papers

Cellulose fiber enzymatic modification to improve the softness, strength, and absorption properties of tissue papers

High cellulase‐free xylanases production by Moesziomyces aphidis using low‐cost carbon and nitrogen sources

Influence of mechanical operation on the biodelignification of Leucaena leucocephala by xylanase treatment

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