期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 59, 期 24, 页码 12910-12916出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf202701b
关键词
Loblolly pine (Pinus taeda L.); milled wood lignin (MWL); stem wood; residue; bark
资金
- U.S. Department of Energy (DOE) [DE-EE0003144/000]
Milled wood lignin samples from Loblolly pine stem wood, forest residue, and bark were isolated and characterized by quantitative C-13 and P-31 nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR), and gel permeation chromatography (GPC) for molecular weight determination. Results from C-13 NMR show the stem wood and forest residue samples have similar functional group contents. However, the bark has fewer methoxyl groups, beta-O-4 structures, dibenzodioxocin, and side chains than the other two lignins. The bark lignin has the highest amounts of p-hydroxyphenyl (h) and C-5 condensed lignin, stem wood has the lowest, and the residue lies between. P-31 NMR analysis indicates that bark lignin contains more C-S substituted phenolics and fewer aliphatic hydroxyl groups than the lignin isolated from stem wood or residue. The molecular weight distribution analysis indicates the bark lignin has higher weight-average molecular weight ((M-w) over bar) and polydispersity index than the lignin recovered from stem wood or residue.
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