报道了巨龙竹Dendrocalamus sinicus的一个新变种——厚壁巨龙竹Dendrocalamus sinicus var.pachyloenus Hui, W. Y. Liu et. Z. J. Shi,区别在于该新变种节部显著隆起,秆基部5-10节具有发达的气生根,秆壁明显较厚。由于其秆壁较厚,单...报道了巨龙竹Dendrocalamus sinicus的一个新变种——厚壁巨龙竹Dendrocalamus sinicus var.pachyloenus Hui, W. Y. Liu et. Z. J. Shi,区别在于该新变种节部显著隆起,秆基部5-10节具有发达的气生根,秆壁明显较厚。由于其秆壁较厚,单位面积秆材产量明显较高,具有更高的开发利用价值,是一个优良种质资源。展开更多
In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were c...In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and 1D and 2D Nuclear Magnetic Resonance(NMR).FT-IR spectra revealed that the "core" of the lignin structure did not significantly change during the treatment under the conditions given.The results of 1H and 13C NMR demonstrated that the lignin fraction L2,isolated with 70% ethanol containing 1% NaOH,was mainly composed of β-O-4 ether bonds together with G and S units and trace p-hydroxyphenyl unit.Based on the 2D HSQC NMR spectrum,the ethanol organosolv lignin fraction L1,extracted with 70% ethanol,presents a predominance of β-O-4′ aryl ether linkages(61% of total side chains),and a low abundance of condensed carbon-carbon linked structures(such as ββ′,β-1′,and β-5′) and a lower S/G ratio.Furthermore,a small percentage(ca.9%) of the linkage side chain was found to be acylated at the γ-carbon.展开更多
文摘报道了巨龙竹Dendrocalamus sinicus的一个新变种——厚壁巨龙竹Dendrocalamus sinicus var.pachyloenus Hui, W. Y. Liu et. Z. J. Shi,区别在于该新变种节部显著隆起,秆基部5-10节具有发达的气生根,秆壁明显较厚。由于其秆壁较厚,单位面积秆材产量明显较高,具有更高的开发利用价值,是一个优良种质资源。
基金Major State Basic Research Projects of China(973-2010CB732204)Specific Programs in Graduate Science and Technology Innovation of Beijing Forestry University(BLYJ201110)
文摘In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and 1D and 2D Nuclear Magnetic Resonance(NMR).FT-IR spectra revealed that the "core" of the lignin structure did not significantly change during the treatment under the conditions given.The results of 1H and 13C NMR demonstrated that the lignin fraction L2,isolated with 70% ethanol containing 1% NaOH,was mainly composed of β-O-4 ether bonds together with G and S units and trace p-hydroxyphenyl unit.Based on the 2D HSQC NMR spectrum,the ethanol organosolv lignin fraction L1,extracted with 70% ethanol,presents a predominance of β-O-4′ aryl ether linkages(61% of total side chains),and a low abundance of condensed carbon-carbon linked structures(such as ββ′,β-1′,and β-5′) and a lower S/G ratio.Furthermore,a small percentage(ca.9%) of the linkage side chain was found to be acylated at the γ-carbon.
