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Biological pretreatment of rice straw with cellulase-free xylanolytic enzyme-producing Bacillus firmus K-1: Structural modification and biomass digestibility

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  • Baramee, Sirilak
  • Siriatcharanon, Ake-kavitch
  • Ketbot, Prattana
  • Teeravivattanakit, Thitiporn
  • Waeonukul, Rattiya
  • Pason, Patthra
  • Tachaapaikoon, Chakrit
  • Ratanakhanokchai, Khanok
  • Phitsuwan, Paripok

Abstract

Biological pretreatment using microorganisms or enzymes offers an eco-friendly process for biomass processing. Herein, the efficiency of pretreatment of rice straw with the cellulase-free xylanolytic enzyme-producing Bacillus firmus K-1 and its enzymes was assessed. After pretreatment with strain K-1 (BRS), the xylan content in rice straw reduced significantly (21% removal), thus increasing exposure of the cellulose crystal structure (Crystallinity index (CrI) = 40.2%) and creating biomass porosity. Subsequent treatment of BRS with the in-house xylanase preparation (BRS-E) slightly increased xylan removal (30% removal). The reduction of xylan thus led to larger pore size and increased crystallinity (CrI = 42.8%). Compared to untreated rice straw (24% glucan conversion), hydrolysis of BRS and BRS-E with the commercial cellulase preparation Accellerase 1500 at 100 g/L substrate load showed comparable glucose yield, giving about 74% glucan conversion. The results indicate that the removal of xylan can enhance accessibility of cellulose to cellulases, although the lignin content was not reduced (24% for BRS and 25% for BRS-E). This work demonstrates a new insight into the improvement of pretreatment efficiency using a xylan-degrading microorganism, which is an alternative to conventional lignin removal by fungal pretreatment.

Suggested Citation

  • Baramee, Sirilak & Siriatcharanon, Ake-kavitch & Ketbot, Prattana & Teeravivattanakit, Thitiporn & Waeonukul, Rattiya & Pason, Patthra & Tachaapaikoon, Chakrit & Ratanakhanokchai, Khanok & Phitsuwan, , 2020. "Biological pretreatment of rice straw with cellulase-free xylanolytic enzyme-producing Bacillus firmus K-1: Structural modification and biomass digestibility," Renewable Energy, Elsevier, vol. 160(C), pages 555-563.
    • Handle: RePEc:eee:renene:v:160:y:2020:i:c:p:555-563
    DOI: 10.1016/j.renene.2020.06.061
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    References listed on IDEAS

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    1. Sarkar, Nibedita & Ghosh, Sumanta Kumar & Bannerjee, Satarupa & Aikat, Kaustav, 2012. "Bioethanol production from agricultural wastes: An overview," Renewable Energy, Elsevier, vol. 37(1), pages 19-27.
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    4. Mustafa, Ahmed M. & Poulsen, Tjalfe G. & Sheng, Kuichuan, 2016. "Fungal pretreatment of rice straw with Pleurotus ostreatus and Trichoderma reesei to enhance methane production under solid-state anaerobic digestion," Applied Energy, Elsevier, vol. 180(C), pages 661-671.
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    1. Jitendra Kumar Singh & Bhawana Chaurasia & Anamika Dubey & Alexis Manuel Faneite Noguera & Aditi Gupta & Richa Kothari & Chandrama Prakash Upadhyaya & Ashwani Kumar & Abeer Hashem & Abdulaziz A. Alqar, 2020. "Biological Characterization and Instrumental Analytical Comparison of Two Biorefining Pretreatments for Water Hyacinth ( Eichhornia crassipes ) Biomass Hydrolysis," Sustainability, MDPI, vol. 13(1), pages 1-16, December.

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