Oxidation of lignin in hemp fibres by laccase: effects on mechanical properties of hemp fibres and unidirectional fibre/epoxy composites

Ming Liu; Andreas Baum; Jürgen Odermatt; Jens Berger; Liyun Yu; Birgitte Zeuner; Anders Thygesen; Jesper Holck; Anne S. Meyer

doi:10.1016/j.compositesa.2017.01.026

Oxidation of lignin in hemp fibres by laccase: effects on mechanical properties of hemp fibres and unidirectional fibre/epoxy composites

Ming Liu, Andreas Baum, Jürgen Odermatt, Jens Berger, Liyun Yu, Birgitte Zeuner, Anders Thygesen, Jesper Holck, Anne S. Meyer

University of Hamburg

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Laccase activity catalyzes oxidation and polymerization of phenols. The effect of laccase treatment on the mechanical properties of hemp fibres and hemp fibre/epoxy composites was examined. Laccase treatment on top of 0.5% EDTA + 0.2% endo-polygalacturonase (EPG) treatments increased the mechanical properties of hemp fibres and fibre/epoxy composites. Comparing all fibre treatments, composites with 0.5% EDTA + 0.2% EPG + 0.5% laccase treated fibres had highest stiffness of 42 GPa and highest ultimate tensile strength (UTS) of 326 MPa at a fibre volume content of 50%. The thermal resistance of hemp fibres increased after laccase treatments, as the maximum degradation temperature increased about 5 °C. Oxidation of phenolic hydroxyls in lignin by laccase was observed. Cross-linking of hydroxycinnamates by laccase was not observed. We suggest that the increased mechanical properties of laccase treated hemp fibres and their composites were due to laccase catalyzed polymerization of lignin moieties in hemp fibres.

Original language	English
Journal	Composites Part A: Applied Science and Manufacturing
Volume	95
Pages (from-to)	377–387
ISSN	1359-835X
DOIs	https://doi.org/10.1016/j.compositesa.2017.01.026
Publication status	Published - 2017

Keywords

A. Natural fibres
A. Polymer-matrix composites (PMCs)
B: Mechanical properties
D: Thermal analysis

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title = "Oxidation of lignin in hemp fibres by laccase: effects on mechanical properties of hemp fibres and unidirectional fibre/epoxy composites",

abstract = "Laccase activity catalyzes oxidation and polymerization of phenols. The effect of laccase treatment on the mechanical properties of hemp fibres and hemp fibre/epoxy composites was examined. Laccase treatment on top of 0.5% EDTA + 0.2% endo-polygalacturonase (EPG) treatments increased the mechanical properties of hemp fibres and fibre/epoxy composites. Comparing all fibre treatments, composites with 0.5% EDTA + 0.2% EPG + 0.5% laccase treated fibres had highest stiffness of 42 GPa and highest ultimate tensile strength (UTS) of 326 MPa at a fibre volume content of 50%. The thermal resistance of hemp fibres increased after laccase treatments, as the maximum degradation temperature increased about 5 °C. Oxidation of phenolic hydroxyls in lignin by laccase was observed. Cross-linking of hydroxycinnamates by laccase was not observed. We suggest that the increased mechanical properties of laccase treated hemp fibres and their composites were due to laccase catalyzed polymerization of lignin moieties in hemp fibres.",

keywords = "A. Natural fibres, A. Polymer-matrix composites (PMCs), B: Mechanical properties, D: Thermal analysis",

author = "Ming Liu and Andreas Baum and J{\"u}rgen Odermatt and Jens Berger and Liyun Yu and Birgitte Zeuner and Anders Thygesen and Jesper Holck and Meyer, {Anne S.}",

year = "2017",

doi = "10.1016/j.compositesa.2017.01.026",

language = "English",

volume = "95",

pages = "377–387",

journal = "Composites Part A: Applied Science and Manufacturing",

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T1 - Oxidation of lignin in hemp fibres by laccase: effects on mechanical properties of hemp fibres and unidirectional fibre/epoxy composites

AU - Liu, Ming

AU - Baum, Andreas

AU - Odermatt, Jürgen

AU - Berger, Jens

AU - Yu, Liyun

AU - Zeuner, Birgitte

AU - Thygesen, Anders

AU - Holck, Jesper

AU - Meyer, Anne S.

PY - 2017

Y1 - 2017

N2 - Laccase activity catalyzes oxidation and polymerization of phenols. The effect of laccase treatment on the mechanical properties of hemp fibres and hemp fibre/epoxy composites was examined. Laccase treatment on top of 0.5% EDTA + 0.2% endo-polygalacturonase (EPG) treatments increased the mechanical properties of hemp fibres and fibre/epoxy composites. Comparing all fibre treatments, composites with 0.5% EDTA + 0.2% EPG + 0.5% laccase treated fibres had highest stiffness of 42 GPa and highest ultimate tensile strength (UTS) of 326 MPa at a fibre volume content of 50%. The thermal resistance of hemp fibres increased after laccase treatments, as the maximum degradation temperature increased about 5 °C. Oxidation of phenolic hydroxyls in lignin by laccase was observed. Cross-linking of hydroxycinnamates by laccase was not observed. We suggest that the increased mechanical properties of laccase treated hemp fibres and their composites were due to laccase catalyzed polymerization of lignin moieties in hemp fibres.

AB - Laccase activity catalyzes oxidation and polymerization of phenols. The effect of laccase treatment on the mechanical properties of hemp fibres and hemp fibre/epoxy composites was examined. Laccase treatment on top of 0.5% EDTA + 0.2% endo-polygalacturonase (EPG) treatments increased the mechanical properties of hemp fibres and fibre/epoxy composites. Comparing all fibre treatments, composites with 0.5% EDTA + 0.2% EPG + 0.5% laccase treated fibres had highest stiffness of 42 GPa and highest ultimate tensile strength (UTS) of 326 MPa at a fibre volume content of 50%. The thermal resistance of hemp fibres increased after laccase treatments, as the maximum degradation temperature increased about 5 °C. Oxidation of phenolic hydroxyls in lignin by laccase was observed. Cross-linking of hydroxycinnamates by laccase was not observed. We suggest that the increased mechanical properties of laccase treated hemp fibres and their composites were due to laccase catalyzed polymerization of lignin moieties in hemp fibres.

KW - A. Natural fibres

KW - A. Polymer-matrix composites (PMCs)

KW - B: Mechanical properties

KW - D: Thermal analysis

U2 - 10.1016/j.compositesa.2017.01.026

DO - 10.1016/j.compositesa.2017.01.026

M3 - Journal article

SN - 1359-835X

VL - 95

SP - 377

EP - 387

JO - Composites Part A: Applied Science and Manufacturing

JF - Composites Part A: Applied Science and Manufacturing

ER -

Oxidation of lignin in hemp fibres by laccase: effects on mechanical properties of hemp fibres and unidirectional fibre/epoxy composites

Abstract

Keywords

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