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Enzymatic Conversion of Hydrolysis Lignin—A Potential Biorefinery Approach

Author

Listed:
  • Sharib Khan

    (Chair of Biosystems Engineering, Institute of Forestry and Engineering, Estonian University of Life Sciences, Friedrich Reinhold Kreutzwaldi 1a, 51014 Tartu, Estonia)

  • Kait Kaarel Puss

    (The Core Laboratory for Wood Chemistry and Bioprocessing, University of Tartu, Ravila 14a, 50411 Tartu, Estonia)

  • Tiit Lukk

    (Laboratory of Lignin Biochemistry, Department of Chemistry and Biotechnology, Tallinn University of Technology, 12618 Tallinn, Estonia)

  • Mart Loog

    (The Core Laboratory for Wood Chemistry and Bioprocessing, University of Tartu, Ravila 14a, 50411 Tartu, Estonia
    Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia)

  • Timo Kikas

    (Chair of Biosystems Engineering, Institute of Forestry and Engineering, Estonian University of Life Sciences, Friedrich Reinhold Kreutzwaldi 1a, 51014 Tartu, Estonia)

  • Siim Salmar

    (The Core Laboratory for Wood Chemistry and Bioprocessing, University of Tartu, Ravila 14a, 50411 Tartu, Estonia
    Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia)

Abstract

Lignin is an abundant and renewable source capable of replacing different raw materials in the chemical industry. It can be obtained from lignocellulosic biomass (LCB) via different pretreatment methods. In the present study, hydrolysis lignin (HL) from the Sunburst TM pretreatment technology was utilized to investigate its enzymatic conversion. At first, soluble HL fractions were obtained via alkali solubilization followed by acid precipitation, referred to as acid precipitated lignin (APL). Furthermore, the APL was tested with three different bacterial laccases to identify the optimal conditions for its conversion into small molecular weight fractions. Among the tested laccases, Streptomyces coelicolor A3(2) ( ScLac ) displayed the highest rate of APL conversion with a high lignin dosage and under extremely alkaline conditions, i.e., 50 g/L in 0.25 M NaOH solution, resulting in higher molecular weight fractions. The increase in the molecular weight and quantitative linkages before and after the enzymatic oxidation of the APL were characterized by size exclusion chromatography (SEC), Fourier-transform infrared spectroscopy (FT-IR), and two-dimensional heteronuclear single quantum correlation nuclear magnetic resonance (2D HSQC NMR) methods.

Suggested Citation

  • Sharib Khan & Kait Kaarel Puss & Tiit Lukk & Mart Loog & Timo Kikas & Siim Salmar, 2022. "Enzymatic Conversion of Hydrolysis Lignin—A Potential Biorefinery Approach," Energies, MDPI, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:370-:d:1018338
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    References listed on IDEAS

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    1. Chio, Chonlong & Sain, Mohini & Qin, Wensheng, 2019. "Lignin utilization: A review of lignin depolymerization from various aspects," Renewable and Sustainable Energy Reviews, Elsevier, vol. 107(C), pages 232-249.
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