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Structural characteristics of milled wood lignin (MWL) isolated from green liquor (GL) pretreated poplar (Populus deltoides)

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Veröffentlicht/Copyright: 24. Oktober 2016
Holzforschung
Aus der Zeitschrift Holzforschung Band 71 Heft 2

Abstract

Pretreatment is one of the key steps for the utilization of lignocellulosic biomasses via biorefinery. Green liquor (GL) pretreatment has been considered as an effective approach to improve the subsequent enzymatic saccharification. For the better understanding of the structural changes of lignin in GL pretreatment, milled wood lignin (MWL) samples isolated from untreated and GL-pretreated poplar by the Björkman method were characterized by means of gel permeation chromatography (GPC), alkaline nitrobenzene oxidation (NBO), Fourier transform-infrared (FT-IR) spectroscopy, and quantitative 13C and 2D heteronuclear single quantum coherence nuclear magnetic resonance (HSQC NMR). The results indicate that the average molecular weight of MWLs decreased after GL pretreatment. Surprisingly, more guaiacyl-propane units are extracted under mild alkaline conditions than syringyl-propane units, which results in a higher condensation degree and higher S/G ratios of MWLs isolated from GL-pretreated poplars. The amount of β–O–4 structures decreased, while the β–β and β-5 structures increased after GL pretreatment. The structure of esterified p-hydroxybenzoic acid was detected in poplar MWL sample and it degraded obviously after GL pretreatment.

Keywords: green liquor (GL) pretreatment; milled wood lignin (MWL); nitrobenzene oxidation (NBO); poplar; quantitative 13C and 2D HSQC NMR; S/G ratio in lignins; structural characteristics of MWL
Corresponding author: Dr. Yongcan Jin, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China, Phone: +86(25)8542 8163, Fax: +86(25)8542 8689

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 31370571

Award Identifier / Grant number: 31400514

Funding statement: This work was supported by the National Key Technology Research and Development Program of China (grant number 2015BAD15B09); the National Natural Science Foundation of China (grant numbers 31370571, 31400514); the Specialized Research Fund for the Doctoral Program of Higher Education, China (grant number 20133204110006); and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China. The authors also would like to thank Dr. Jialong Wen of Institute of Biomass Chemistry and Technology, Beijing Forestry University for the NMR analysis.

Acknowledgments

This work was supported by the National Key Technology Research and Development Program of China (grant number 2015BAD15B09); the National Natural Science Foundation of China (grant numbers 31370571, 31400514); the Specialized Research Fund for the Doctoral Program of Higher Education, China (grant number 20133204110006); and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China. The authors also would like to thank Dr. Jialong Wen of Institute of Biomass Chemistry and Technology, Beijing Forestry University for the NMR analysis.

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Received: 2016-6-3
Accepted: 2016-9-28
Published Online: 2016-10-24
Published in Print: 2017-2-1

©2017 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Original Articles
  3. Effects of hot water extraction (HWE) of Douglas fir as a pre-process for the sulfite pretreatment to overcome recalcitrance of lignocellulose (SPORL)
  4. Structural characteristics of milled wood lignin (MWL) isolated from green liquor (GL) pretreated poplar (Populus deltoides)
  5. TEMPO-mediated electro-oxidation reactions of non-phenolic β-O-4-type lignin model compounds
  6. Microstructure of chemically modified wood using X-ray computed tomography in relation to wetting properties
  7. The effects of thermal treatment on the nanomechanical behavior of bamboo (Phyllostachys pubescens Mazel ex H. de Lehaie) cell walls observed by nanoindentation, XRD, and wet chemistry
  8. Assessing specific gravity of young Eucalyptus plantation trees using a resistance drilling technique
  9. A novel device to measure gaseous permeability over a wide range of pressures: characterisation of slip flow for Norway spruce, European beech, and wood-based materials
  10. Stress relaxation of composites made of polypropylene and organo-montmorillonite modified wood flour during water immersion
  11. Sorption/desorption hysteresis revisited. Sorption properties of Pinus pinea L. analysed by the parallel exponential kinetics and Kelvin-Voigt models
  12. Effect of exogenous IAA on tension wood formation by facilitating polar auxin transport and cellulose biosynthesis in hybrid poplar (Populus deltoids × Populus nigra) wood
https://doi.org/10.1515/hf-2016-0093
Schlagwörter für diesen Artikel
green liquor (GL) pretreatment; milled wood lignin (MWL); nitrobenzene oxidation (NBO); poplar; quantitative 13C and 2D HSQC NMR; S/G ratio in lignins; structural characteristics of MWL

Artikel in diesem Heft

  1. Frontmatter
  2. Original Articles
  3. Effects of hot water extraction (HWE) of Douglas fir as a pre-process for the sulfite pretreatment to overcome recalcitrance of lignocellulose (SPORL)
  4. Structural characteristics of milled wood lignin (MWL) isolated from green liquor (GL) pretreated poplar (Populus deltoides)
  5. TEMPO-mediated electro-oxidation reactions of non-phenolic β-O-4-type lignin model compounds
  6. Microstructure of chemically modified wood using X-ray computed tomography in relation to wetting properties
  7. The effects of thermal treatment on the nanomechanical behavior of bamboo (Phyllostachys pubescens Mazel ex H. de Lehaie) cell walls observed by nanoindentation, XRD, and wet chemistry
  8. Assessing specific gravity of young Eucalyptus plantation trees using a resistance drilling technique
  9. A novel device to measure gaseous permeability over a wide range of pressures: characterisation of slip flow for Norway spruce, European beech, and wood-based materials
  10. Stress relaxation of composites made of polypropylene and organo-montmorillonite modified wood flour during water immersion
  11. Sorption/desorption hysteresis revisited. Sorption properties of Pinus pinea L. analysed by the parallel exponential kinetics and Kelvin-Voigt models
  12. Effect of exogenous IAA on tension wood formation by facilitating polar auxin transport and cellulose biosynthesis in hybrid poplar (Populus deltoids × Populus nigra) wood
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