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An efficient magnetic carbon-based solid acid treatment for corncob saccharification with high selectivity of xylose and enhanced enzymatic digestibility

Qi, W., Liu, G., He, C., Liu, S., Lu, S., Yue, J., Wang, Q., Wang, Z., Yuan, Z. & Hu, J., 2019, In : Green Chemistry. 21, 6, p. 1292–1304

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  • An efficient magnetic carbon-based solid acid treatment for corncob saccharification with high selectivity for xylose and enhanced enzymatic digestibility

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DOI

  • Wei Qi
  • Guifeng Liu
  • Chao He
  • Shuna Liu
  • Si Lu
  • Jun Yue
  • Qiong Wang
  • Zhongming Wang
  • Zhenhong Yuan
  • Jianhua Hu
An effective method for corncob saccharification was investigated over a magnetic carbon-based solid acid (MMCSA) catalyst in the aqueous phase. MMCSA was synthesized through a simple and inexpensive impregnation-carbonization-sulfonation process. Under the optimal reaction conditions (150 °C, 2 h, 0.5 g corncob, 0.5 g catalyst and 50 ml deionized water), 74.9% of xylose yield was directly obtained from corncob, with 91.7% cellulose retention in the residue. After reaction, the MMCSA was easily separated from the residue by an external magnet and reused 4 times showing high stability and catalytic activity. The enzymatic digestibility of the pretreated residue reached 95.2%, with a total sugar yield of 90.4%. The morphologic and structural properties of the natural and treated corncobs were analyzed primarily through 3D X-ray microscopy to characterize the cell wall thickness, porosity, and pore surface area distribution. The increase of macropores (pore surface areas > 200 μm2) was beneficial to the accessibility of cellulose to cellulosic enzymes, so the enzymatic digestibility was enhanced immediately. Compared with other traditional hydrolysis methods, this two-step hydrolysis approach represents an environmentally friendly and sustainable saccharification of lignocellulose to produce xylose and glucose while achieving the same level of reaction efficiency.
Original languageEnglish
Pages (from-to)1292–1304
JournalGreen Chemistry
Volume21
Issue number6
Publication statusPublished - 2019

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