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Production of Hemicellulose Sugars Combined with the Alkaline Extraction Lignin Increased the Hydro-Depolymerization of Cellulose from Corn Cob

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  • Xiaorui Yang

    (College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China)

  • Xiaotong Li

    (College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China)

  • Liyan Zhu

    (College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China)

  • Jinhua Liang

    (College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China)

  • Jianliang Zhu

    (College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China)

Abstract

Hydro-depolymerization is a novel method for converting agricultural waste into eco-friendly and promising products. Due to the complex structure and composition of corn cob (CC), a three-step process was developed, which involved pre-hydro-depolymerization of hemicellulose, alkaline extraction of lignin, and hydro-depolymerization of cellulose. The pre-hydro-depolymerization step was at first optimized to produce five-carbon and six-carbon sugars, achieving a maximum hemicellulose conversion rate of 78.48 ± 3.92%, and reducing a sugar yield of 59.12 ± 2.95%. Alkaline treatment achieved a maximum lignin extraction efficiency of 73.76 ± 3.68%. After hemicellulose removal and delignification, the cellulose conversion rate increased to 36.63% and further increased to 76.97% after five cycles. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were performed to confirm physical and chemical changes in CC residues. The integrated process of hydro-depolymerization and alkaline treatment enables the complete exploitation of cellulose, hemicellulose, and lignin, and thus holds great potential for application in the agriculture industry.

Suggested Citation

  • Xiaorui Yang & Xiaotong Li & Liyan Zhu & Jinhua Liang & Jianliang Zhu, 2023. "Production of Hemicellulose Sugars Combined with the Alkaline Extraction Lignin Increased the Hydro-Depolymerization of Cellulose from Corn Cob," Sustainability, MDPI, vol. 15(11), pages 1-19, June.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:11:p:9041-:d:1163107
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    References listed on IDEAS

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    1. Xiaorui Yang & Xiaotong Li & Jinhua Liang & Jianliang Zhu, 2023. "Comparative Study of Effective Pretreatments on the Structural Disruption and Hydrodepolymerization of Rice Straw," Sustainability, MDPI, vol. 15(6), pages 1-18, March.
    2. Tsegaye, Bahiru & Balomajumder, Chandrajit & Roy, Partha, 2020. "Organosolv pretreatments of rice straw followed by microbial hydrolysis for efficient biofuel production," Renewable Energy, Elsevier, vol. 148(C), pages 923-934.
    3. Xiaorui Yang & Jing Zhao & Jinhua Liang & Jianliang Zhu, 2020. "Efficient and Selective Catalytic Conversion of Hemicellulose in Rice Straw by Metal Catalyst under Mild Conditions," Sustainability, MDPI, vol. 12(24), pages 1-14, December.
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