竹材木质素特性及表征方法研究进展

doi:10.11896/cldb.19060064

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Abstract Bamboo is a natural fibre reinforced composites, with excellent performance, which is an alternative to shortage of wood resource to a certain extent. Heterogeneous distribution and molecular structure of lignin is one of the factors that determine the performance, and it is the key and difficult basic research in anatomy and chemistry of bamboo. The lignification of bamboo fiber and parenchyma cell incrementally strengthens du-ring the first growing season. The bamboo fibres exhibit a polylamellate structure, and the lignification advances from the cell wall near lumen to compound middle lamellae. Vessels and fibre cells begin to lignify before stem elongation growth is complete, while lignification of parenchyma is completed after stem elongation. Bamboo lignin are composed of guaiacyl (G) units and syringyl (S) units, and it also contains a considerable amount of p-hydroxyphenyl (H) units having ester bonds between p-coumaric acid. This paper reviewed the current advances of cell wall structure, lignin distribution, separation method and molecular structure of bamboo, then the results will be expected to provide reference data for bamboo’s mechanical property adaptability, processing technology and high value-added utilization.
The research on the lignin distribution of bamboo cell wall by means of various fluorescence microscopy, ultraviolet micro-spectrophotometry, scanning electron microscopy and energy dispersive X-ray spectroscopy, transmission microscopy and confocal laser scanning microscopy, coupled with the Wiesner and Maule reaction and immunocytochemistry technology. Confocal raman microscopy combined with spectral imaging technology, and nano-infrared technology provides a powerful means for the study of the lignin topochemistry in bamboo cell wall. It also outlines the separation method of the original lignin, which can be mainly divided into milled wood lignin, cellulolytic enzyme lignin, and a combination of various chemical and physical means of enzymatic acidolysis lignin, residual lignin through two ball milling and two enzymatic hydrolysis, and the advantages of the structure and purity of lignin obtained by different methods were evaluated. In addition, the lignin separated by chemical pretreatment due to different reagents includes acid lignin, alkali lignin, solvent lignin, etc., especially the use of green solvents such as toluenesulfonic acid, ionic liquid, low cosolvent, etc., enables efficient separation of lignin. The analytical tools to the elucidation of lignin molecular structure such as wet chemical method, including nitrobenzene oxidation, permanganate oxidation, derivatization followed by reductive cleavage, thioa-cidolysis, and pyrolysis gas chromatography-mass spectrometer (Pyr-GC-MS). Wet chemical method can obtain the lignin structure, but the complete information on the functional group characterization is not available. Spectroscopic analysis can qualitatively and quantitatively analyze the functional groups of lignin, and the complete structural information of lignin can be obtained. The spectroscopy mainly includes ultraviolet spectroscopy, Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) techniques. The latest progress in cha-racterizing the molecular structure of lignin by advanced liquid-state nuclear magnetic resonance techniques such as 13C and 2D HSQC NMR method is reviewed. In addition, prospects and future research in its field were proposed.

Key words： bamboo lignin heterogeneous distribution microspectroscopy technology molecular structure

Published: 10 April 2020

CLC number:

S781.42

Fund:This work was financially supported by the National Science and Technology Support Plan (2015BAD04B03) and the National Natural Science Foundation of China (31670565).

About author:: Shumin Yangreceived her B.E. and M.S. degree in forestry from Inner Mongolia Agricultural University in 1995 and 1998, respectively. In 2003, she received her Ph.D. degree in wood science and technology from Tottori University, Japan. She is currently asso-ciate professor in International Center for Bamboo and Rattan (ICBR). Her research interests are characte-ristics of cell wall of biomaterials and non-destructive technology for wood and bamboo based on X-ray imaging. She has chaired or participated in over 10 national and provincial level projects and has published 4 books (including co-authored works) and over 40 publications papers. Currently, she is a member of Bamboo and rattan resources and utilization Branch under Chinese Society of Forestry (CSF), also a member of biomass materials Branch under CSF.
Zehui Jiang, Professor, Fellow of the International Academy of Wood Science and Chief Scientist at Chinese Academy of Forestry and the International Centre for Bamboo and Rattan, is a doctoral supervisor and sits on the panel of post-doctoral supervision. She is a renowned scientist in the material science of wood (and bamboo and rattan) and a leader of this discipline in China. She was appointed as Co-Chair, Board of Trustees, International Bamboo and Rattan Organization, and Director General, International Centre for Bamboo and Rattan, National Forestry and Grassland Administration of China. During her decades-long career in forest utilization, forestry engineering, wood science and wood anatomy, she has been a lecturer, researcher, and manager of scientific R&D projects. She has chaired and participated in more than 40 major scientific research projects. She has authored over 50 monographs and published more than 500 journal papers, while the number of postgraduate students and postdoctoral fellows she has supervised now exceeds 100. Her research has won her 1 first prize and 3 second prizes from the National Science and Technology Progress Awards and 8 ministry-level prizes.

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	YANG Shumin
	LIU Xing’e
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	TIAN Genlin
	JIANG Zehui

Cite this article:

YANG Shumin,LIU Xing’e,SHANG Lili, et al. The Characteristics and Representation Methods of Lignin for Bamboo[J]. Materials Reports, 2020, 34(7): 7177-7182.

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http://www.mater-rep.com/EN/10.11896/cldb.19060064 OR http://www.mater-rep.com/EN/Y2020/V34/I7/7177

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