Journal
JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY
Volume 36, Issue 3, Pages 157-172Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/02773813.2015.1104544
Keywords
Phyllostachys pubescens; lignin; structural characterization; quantitative NMR; LCC; tricin
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Funding
- National Key Technology Research and Development Program of China [2015BAD15B09]
- Natural Science Foundation of Jiangsu Provincial University [14KJB220006]
- Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD)
- Doctorate Fellowship Foundation of Nanjing Forestry University
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Milled wood lignins were isolated from green and yellow bamboo (Phyllostachys pubescens), termed MWLg and MWLy, respectively. The structural features of the lignin preparations and the remaining LCC were characterized by quantitative C-13 nuclear magnetic resonance (C-13 NMR) spectroscopy and two-dimensional heteronuclear signal quantum coherence NMR (2D HSQC NMR) spectroscopy. The results indicated that the main substructures in MWLg and MWLy were beta-O-4 alkyl-aryl ether, resinol, phenylcoumaran, spirodienone, and alpha,beta-diaryl ether, and their abundances per 100 Ar units were 38.2 and 39.8, 6.9 and 6.3, 3.8 and 2.9, 1.7 and 2.1, 0.4 and 0.3, respectively. The S:G:H ratios of MWLg and MWLy were estimated to be 40: 54: 6 and 51: 44: 5, respectively. The gamma-acylation of green bamboo lignin was 17.22%, lower than that of yellow bamboo lignin (21.12%). Moreover, a flavonoid compound (tricin) was also detected in the MWLg and MWLy. Some carbohydrates remained in the purified MWL preparations, which were considered as the lignin-carbohydrate complexes (LCC).
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