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<p>KOH-urea pretreatment of lignocellulose has increasingly gained attention due to its mild reaction condition and recyclable liquid waste. However, the mechanism of urea assisting KOH pretreatment to improve enzymatic hydrolysis of lignocellulose remains to be further explored. This study found that urea addition could enhance KOH solution to remove lignin from rice straw (RS). When the ratio of KOH to urea was 1:1, the treated RS which was composed of 44.58 ± 0.39% glucan, 15.14 ± 0.12% xylan, and 12.40 ± 0.06% acid-insoluble lignin attained the maximum total sugar production of 57.52 ± 2.42&#xa0;mg/mL and enzymatic hydrolysis efficiency of 84.34 ± 4.85%. The structural features of KOH and KOH-urea-treated RS samples were characterized by scanning electron microscopy (SEM), Brunauer-Emmet-Teller (BET), Fourier transform infrared spectrometer (FTIR), and X-ray diffraction (XRD). It showed that a proper urea addition could intensify the physical structure changes and chemical groups release of KOH-treated RS. After detecting the hydrogen bonds in KOH and KOH-urea solutions, it was found that an appropriate urea addition could improve the hydrogen bonding linkage between chemical reagents and lignin. It might be the reason for maximum enzymatic hydrolysis of KOH-urea-treated lignocellulose which was obtained with a suitable addition of urea. This study provided some evidences to explain the mechanism of urea facilitating KOH pretreatment of lignocellulose.</p>

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Hydrogen Bonding Improvement of Urea Assisting Potassium Hydroxide Pretreatment to Enhance Enzymatic Hydrolysis of Rice Straw

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Xiangliang Du,
  • Wen Wang,
  • Cuiyi Liang,
  • Shiyou Xing,
  • Yu Zhang,
  • Wei Liu,
  • Xuesong Tan,
  • Wei Qi

摘要

KOH-urea pretreatment of lignocellulose has increasingly gained attention due to its mild reaction condition and recyclable liquid waste. However, the mechanism of urea assisting KOH pretreatment to improve enzymatic hydrolysis of lignocellulose remains to be further explored. This study found that urea addition could enhance KOH solution to remove lignin from rice straw (RS). When the ratio of KOH to urea was 1:1, the treated RS which was composed of 44.58 ± 0.39% glucan, 15.14 ± 0.12% xylan, and 12.40 ± 0.06% acid-insoluble lignin attained the maximum total sugar production of 57.52 ± 2.42 mg/mL and enzymatic hydrolysis efficiency of 84.34 ± 4.85%. The structural features of KOH and KOH-urea-treated RS samples were characterized by scanning electron microscopy (SEM), Brunauer-Emmet-Teller (BET), Fourier transform infrared spectrometer (FTIR), and X-ray diffraction (XRD). It showed that a proper urea addition could intensify the physical structure changes and chemical groups release of KOH-treated RS. After detecting the hydrogen bonds in KOH and KOH-urea solutions, it was found that an appropriate urea addition could improve the hydrogen bonding linkage between chemical reagents and lignin. It might be the reason for maximum enzymatic hydrolysis of KOH-urea-treated lignocellulose which was obtained with a suitable addition of urea. This study provided some evidences to explain the mechanism of urea facilitating KOH pretreatment of lignocellulose.