Bleach-boosting effect of crude xylanase from Bacillus stearothermophilus SDX on wheat straw pulp

Garg, Gaurav; Dhiman, Saurabh Sudha; Mahajan, Ritu; Kaur, Amanjot; Sharma, Jitender

doi:10.1016/j.nbt.2010.07.020

Cited by 38 publications

(20 citation statements)

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“…Viikari et al (1986) reported the first study on the role of xylanase in the biobleaching of pulp. Since then, many studies on biobleaching with xylanases have been reported (Manimaran et al 2009;Garg et al 2011), and a number of xylanase products have been developed. With the xylanase biobleaching technique, the pulp is usually treated with xylanase before chemical bleaching (Martin-Sampedro et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Viscosity reduction is not desirable because this property is related to the degree of cellulose polymerization and to paper strength (Paice et al 1988). Current studies on xylanase biobleaching have mainly focused on reduction of the consumption of bleaching chemicals (Garg et al 2011;Manimaran et al 2009;Khandeparkar and Bhosle 2007;Li et al 2005); very little attention has been given to the effects of xylanase on the yield and viscosity of pulp (Kantelinen et al 1993;Xu et al 2013). In the present study, a fermentation of S. griseorubens LH-3 was conducted, the crude xylanase extract was prepared, and the enzymatic properties of the crude xylanase were studied.…”

Section: Introductionmentioning

confidence: 99%

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Biobleaching Effects of Crude Xylanase from Streptomyces griseorubens LH-3 on Eucalyptus Kraft Pulp

Cheng¹,

Chen²,

Huang³

et al. 2013

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In this work, a xylanase-producing strain, Streptomyces griseorubens LH-3, was cultured, and the crude xylanase was prepared. Analysis of its enzymatic properties revealed that the crude xylanase possessed good thermal stability at temperatures below 60 o C, exhibited a wide pH range from 4.0 to 9.0, and was cellulase-free. This crude enzyme was used to treat eucalyptus kraft pulp, and the release of chromophores was the highest at the dosage of 20 IU g −1 dry pulp. Compared with the untreated group, biobleaching of eucalyptus kraft pulp with this enzyme increased the brightness of the pulp by 12.9% and reduced the Kappa number by 27.4%. Biobleaching of eucalyptus kraft pulp with this enzyme obtained the same final pulp brightness compared with that of the control; however, hydrogen peroxide consumption was reduced by 17% and the yield and viscosity of the pulp was increased by 1.47% and 1.53%, respectively. This crude xylanase has promising potential for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biobleaching Effects of Crude Xylanase from Streptomyces griseorubens LH-3 on Eucalyptus Kraft Pulp

Cheng¹,

Chen²,

Huang³

et al. 2013

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“…Xylanases (1,4-b-D-xylan xylanohyrolase; EC 3.2.1.8) constitute one of the most important industrial enzyme that depolymerizes xylan molecule into xylose units and is produced by different microorganisms, including bacteria (Sanghi et al 2008;Lakshmi et al 2009;Garg et al 2011;Nagar et al 2010), fungi (Shirkolaee et al 2008;Camassola and Dillon 2010;Sanghvi et al 2010) and actinomycetes (Beg et al 2000;Bajaj and Singh 2010). In recent years, interest in xylanases have been increased due to their potential use in the pulp and paper industry, textile industry, food processing and wine industry (Hang and Woodams 1997;Csiszar et al 2006;Battan et al 2007Battan et al , 2008Dhiman et al 2008Dhiman et al , 2009.…”

Section: Introductionmentioning

confidence: 99%

“…A number of reports are available on the use of xylanase for biobleaching of kraft pulp but only a few reports are available on the application of bacterial xylanases in biobleaching of wheat straw pulp (Li et al 2005;Choudhary et al 2006;Garg et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Xylanase production using agro-residue in solid-state fermentation from Bacillus pumilus ASH for biodelignification of wheat straw pulp

et al. 2011

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Two stage statistical design was used to optimize xylanase production from Bacillus pumilus ASH under solid-state fermentation. Initially, Plackett-Burman designing (PB) was used for the selection of crucial production parameters. Peptone, yeast extract, incubation time, moisture level and pH were found to be the crucial factors for the xylanase production. Crucial variables were further processed through central composite designing (CCD) of response surface methodology (RSM) to maximize the xylanase yield. Each significant factor was investigated at five different levels to study their influence on enzyme production. Statistical approach resulted in 2.19-fold increase in xylanase yield over conventional strategy. The determination coefficient (R (2)) as shown by analysis of variance (ANOVA) was 0.9992, which shows the adequate credibility of the model. Potential of cellulase-free xylanase was further investigated for biobleaching of wheat straw pulp. Xylanase aided bleaching through XCDED(1)D(2) sequence resulted in 20 and 17% reduction in chlorine and chlorine dioxide consumption as compared to control. Significant increase in pulp brightness (%ISO), whiteness and improvement in various pulp properties was also observed.

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“…This emphasizes the xylan-hydrolyzing potential of T. reesei to release xylose oligomers and other soluble sugars (Jørgensen et al 2007), and may explain the higher xylose concentrations documented in this study. In addition, xylanases may assist in the pulp beaching process, by removing xylan which allows for easier bleaching of the cellulose fibers, therefore consuming less bleach and energy (Garg et al 2011). This partial degradation of xylan could also assist in the degradation of lignin by other microorganisms present, which is essential as lignin also impedes pulp bleaching (Subramaniyan and Prema 2002).…”

Section: Fig 2 Lipophilic Profiles Of Different Eucalyptus Speciesmentioning

confidence: 99%

The Effects of Wood Storage on the Chemical Composition and Indigenous Microflora of Eucalyptus species Used in the Pulping Industry

2017

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Lipophilic extractives naturally occurring in wood tend to coalesce during pulping to form pitch deposits, which have particularly undesirable effects on the pulping process and quality of pulp produced. A chemical characterization of different eucalypt species [Eucalyptus nitens, E. grandis, and E. dunnii (of different site qualities)] wood and generated pulp was performed. This study aimed at determining the effects of wood storage at -20 °C (for 6 months), by examining their chemical composition and indigenous microflora. Fatty acids were the main lipophilic compounds among E. dunnii (SQ3 and SQ4) and E. grandis wood extractives. The wood of E. nitens posed the least risk for pitch deposit formation, making it the most suitable Eucalyptus species for pulping. Storage of wood chips at -20 °C had a similar effect as the traditional method of seasoning (storage of wood outdoors prior to pulping) used for the reduction of lipophilic extractives. A 25 to 44% reduction of total extractives was observed in the raw material after storage. Variations in bacterial and fungal communities were observed after storage, and should be taken into consideration when conducting lab scale trials. If storage of wood chips is necessary for lab testing, it should be retained for a maximum of 3 months at -20 °C.

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Bleach-boosting effect of crude xylanase from Bacillus stearothermophilus SDX on wheat straw pulp

Cited by 38 publications

References 28 publications

Biobleaching Effects of Crude Xylanase from Streptomyces griseorubens LH-3 on Eucalyptus Kraft Pulp

Biobleaching Effects of Crude Xylanase from Streptomyces griseorubens LH-3 on Eucalyptus Kraft Pulp

Xylanase production using agro-residue in solid-state fermentation from Bacillus pumilus ASH for biodelignification of wheat straw pulp

The Effects of Wood Storage on the Chemical Composition and Indigenous Microflora of Eucalyptus species Used in the Pulping Industry

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