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<p>Sodium carbonate (Na<sub>2</sub>CO<sub>3</sub>) is a mild alkali-based pretreatment for lignocellulose, making it an eco-friendly method. In this study, sugarcane leaves (ScL), an agricultural waste product from Thailand, were pretreated using various Na<sub>2</sub>CO<sub>3</sub> solutions combined with different heat treatments: a water bath (at 80 °C for 3 h) and laboratory autoclaving (at 121 °C for 1 h). The results showed higher cellulose content (44.26–50.29%) and lower lignin content (12.33–13.00%) in the ScL pretreated with Na<sub>2</sub>CO<sub>3</sub>-autoclaving compared to untreated biomass. Physicochemical characterization were conducted using Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) analyses. Significant structural changes were observed in the functional groups, crystallinity index (CrI), morphological features, and thermal properties of the ScL after Na<sub>2</sub>CO<sub>3</sub> pretreatment conditions. The 0.5 M Na<sub>2</sub>CO<sub>3</sub>-autoclaving pretreatment produced a high sugar yield of 80.80% with an enzyme loading of 15 FFU/g after 72 h of enzymatic hydrolysis, outperforming both the untreated samples and other pretreatment conditions. Overall, this study highlights an approach by combining Na<sub>2</sub>CO<sub>3</sub> with controlled heat treatments, specifically autoclaving, to enhance the pretreatment of sugarcane leaves, an agricultural waste, thereby improving cellulose accessibility, lignin removal, and sugar yield in an eco-friendly manner. Further studies are needed to optimize the pretreatment process.</p> Graphical Abstract <p></p>

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Eco-friendly sodium carbonate pretreatment of sugarcane leaves for enhanced enzymatic saccharification

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • Lueacha Tabtimmai,
  • Sudaporn Benchoosit,
  • Chanikan Sonklin,
  • Sirikwan Tinrat,
  • Onnicha Jiraprasertwong,
  • Kiattawee Choowongkomon,
  • Chakrit Tachaapaikoon,
  • Saranya Sedtananun

摘要

Sodium carbonate (Na2CO3) is a mild alkali-based pretreatment for lignocellulose, making it an eco-friendly method. In this study, sugarcane leaves (ScL), an agricultural waste product from Thailand, were pretreated using various Na2CO3 solutions combined with different heat treatments: a water bath (at 80 °C for 3 h) and laboratory autoclaving (at 121 °C for 1 h). The results showed higher cellulose content (44.26–50.29%) and lower lignin content (12.33–13.00%) in the ScL pretreated with Na2CO3-autoclaving compared to untreated biomass. Physicochemical characterization were conducted using Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) analyses. Significant structural changes were observed in the functional groups, crystallinity index (CrI), morphological features, and thermal properties of the ScL after Na2CO3 pretreatment conditions. The 0.5 M Na2CO3-autoclaving pretreatment produced a high sugar yield of 80.80% with an enzyme loading of 15 FFU/g after 72 h of enzymatic hydrolysis, outperforming both the untreated samples and other pretreatment conditions. Overall, this study highlights an approach by combining Na2CO3 with controlled heat treatments, specifically autoclaving, to enhance the pretreatment of sugarcane leaves, an agricultural waste, thereby improving cellulose accessibility, lignin removal, and sugar yield in an eco-friendly manner. Further studies are needed to optimize the pretreatment process.

Graphical Abstract