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首页> 外文期刊>RSC Advances >Comparing chemical composition and lignin structure of Miscanthus x giganteus and Miscanthus nagara harvested in autumn and spring and separated into stems and leaves
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Comparing chemical composition and lignin structure of Miscanthus x giganteus and Miscanthus nagara harvested in autumn and spring and separated into stems and leaves

机译：比较Miscanthus x Giganteus和Miscanthus Nagara的化学成分和木质素结构在秋季和春季收获，分离成茎和叶子

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摘要

Miscanthus crops possess very attractive properties such as high photosynthesis yield and carbon fixation rate. Because of these properties, it is currently considered for use in second-generation biorefineries. Here we analyze the differences in chemical composition between M. x giganteus, a commonly studied Miscanthus genotype, and M. nagara, which is relatively understudied but has useful properties such as increased frost resistance and higher stem stability. Samples of M. x giganteus (Gig35) and M. nagara (NagG10) have been separated by plant portion (leaves and stems) in order to isolate the corresponding lignins. The organosolv process was used for biomass pulping (80% ethanol solution, 170 degrees C, 15 bar). Biomass composition and lignin structure analysis were performed using composition analysis, Fourier-transform infrared (FTIR), ultraviolet-visible (UV-Vis) and nuclear magnetic resonance (NMR) spectroscopy, thermogravimetric analysis (TGA), size exclusion chromatography (SEC) and pyrolysis gas-chromatography/mass spectrometry (Py-GC/MS) to determine the 3D structure of the isolated lignins, monolignol ratio and most abundant linkages depending on genotype and harvesting season. SEC data showed significant differences in the molecular weight and polydispersity indices for stem versus leaf-derived lignins. Py-GC/MS and hetero-nuclear single quantum correlation (HSQC) NMR revealed different monolignol compositions for the two genotypes (Gig35, NagG10). The monolignol ratio is slightly influenced by the time of harvest: stem-derived lignins of M. nagara showed increasing H and decreasing G unit content over the studied harvesting period (December-April).
机译：Miscanthus作物具有非常有吸引力的性质，如高光合产量和碳固定率。由于这些属性，目前考虑用于第二代生物寄生炉。在这里，我们分析了M. X Giganteus的化学成分的差异，常见的MISCanthus基因型和纳加拉，其相对抑制，但具有有用的性质，例如增加的霜冻性和较高的茎稳定性。 M. X Giganteus（Gig35）和M. nagara（Nagg10）的样品已被植物部分（叶子和茎）分离，以分离相应的木质素。有机溶胶方法用于生物质制浆（80％乙醇溶液，170℃，15巴）。使用成分分析，傅里叶变换红外（FTIR），紫外 - 可见（UV-VI）和核磁共振（NMR）光谱，热重分析（TGA），尺寸排除色谱（SEC）和木质素结构分析生物量组成和木质素结构分析。热解气相色谱/质谱/质谱（Py-GC / MS），以确定分离的木质素的3D结构，单醇率比和最丰富的联系，这取决于基因型和收获季节。 SEC数据显示出茎与叶衍生木质素的分子量和多分散索引的显着差异。 PY-GC / MS和杂核单量子相关（HSQC）NMR显示出两种基因型的不同单醇组合物（GIG35，NAGG10）。通过收获时间略有影响，M. Nagara的茎衍生的木质素显示出越来越多的H，并且通过研究的收获期（12月至4月）降低了G单位含量。

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  • 来源
    《RSC Advances》 |2020年第18期|共12页
  • 作者

    Bergs Michel; Do Xuan Tung; Rumpf Jessica; Kusch Peter; Monakhova Yulia; Konow Christopher; Voelkering Georg; Pude Ralf; Schulze Margit;

  • 作者单位

    Bonn Rhein Sieg Univ Appl Sci Dept Nat Sci von Liebig Str 20 D-53359 Rheinbach Germany;

    Bonn Rhein Sieg Univ Appl Sci Dept Nat Sci von Liebig Str 20 D-53359 Rheinbach Germany;

    Bonn Rhein Sieg Univ Appl Sci Dept Nat Sci von Liebig Str 20 D-53359 Rheinbach Germany;

    Bonn Rhein Sieg Univ Appl Sci Dept Nat Sci von Liebig Str 20 D-53359 Rheinbach Germany;

    Spectral Serv AG Emil Hoffmann Str 33 D-50996 Cologne Germany;

    Brandeis Univ Dept Chem MS 015 415 South St Waltham MA 02254 USA;

    Univ Bonn Inst Crop Sci &

    Resource Conservat Fac Agr Klein Altendorf 2 D-53359 Rheinbach Germany;

    Univ Bonn Inst Crop Sci &

    Resource Conservat Fac Agr Klein Altendorf 2 D-53359 Rheinbach Germany;

    Bonn Rhein Sieg Univ Appl Sci Dept Nat Sci von Liebig Str 20 D-53359 Rheinbach Germany;

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  • 中图分类 化学;
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