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<p>The convoluted structure of rice straw containing high silica in cell wall, sturdy bonding of lignin with fibers, massive fine fractions, strong cellulose crystallinity and other concomitant factors are the major constraints for rice straw applications in various sectors. The conversion of rice straw into treasure requires essential initial treatment so as to separate lignin, reduce silica content and dissolving its hemicellulosic fibers. The present study focused on enzymatic pretreatment of rice straw with cellulase (CTec2), xylopectinase, laccase and silicases to reduce lignin, ash and silica without causing depletion of long chain fibers. The process conditions like dose, pretreatment time, temperature and pH for every enzymatic pretreatment were optimized. The results obtained with all enzymes were significant but the highest reduction of 26.5% in lignin and 20.8% in ash content of rice straw was approached during laccase pretreatment. After that, the major reduction in silica i.e. 19.7% during silicases pretreatment was achieved at optimized conditions. CTec2 and xylopectinase were also effective during pretreatments but showed dramatic impact on fibrous composition. The study revealed that a proficient two stage enzymatic pretreatment process based on silicase and laccase for rice straw can be developed using present results to add value to this agro-waste.</p> Graphical abstract <p></p>

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Enzymatic Pre-valorization of Paddy Straw for Bio-delignification and Silica Reduction: Pioneer Step Towards Cleaner Production

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Daljeet Kaur,
  • Nitu Mor,
  • Prabhjot Kaur,
  • Bindu Battan,
  • Amarjit Singh,
  • Jitender Sharma

摘要

The convoluted structure of rice straw containing high silica in cell wall, sturdy bonding of lignin with fibers, massive fine fractions, strong cellulose crystallinity and other concomitant factors are the major constraints for rice straw applications in various sectors. The conversion of rice straw into treasure requires essential initial treatment so as to separate lignin, reduce silica content and dissolving its hemicellulosic fibers. The present study focused on enzymatic pretreatment of rice straw with cellulase (CTec2), xylopectinase, laccase and silicases to reduce lignin, ash and silica without causing depletion of long chain fibers. The process conditions like dose, pretreatment time, temperature and pH for every enzymatic pretreatment were optimized. The results obtained with all enzymes were significant but the highest reduction of 26.5% in lignin and 20.8% in ash content of rice straw was approached during laccase pretreatment. After that, the major reduction in silica i.e. 19.7% during silicases pretreatment was achieved at optimized conditions. CTec2 and xylopectinase were also effective during pretreatments but showed dramatic impact on fibrous composition. The study revealed that a proficient two stage enzymatic pretreatment process based on silicase and laccase for rice straw can be developed using present results to add value to this agro-waste.

Graphical abstract