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比较秋季和春季收获并分为茎和叶的[具体内容未给出]的化学成分和木质素结构。

Comparing chemical composition and lignin structure of and harvested in autumn and spring and separated into stems and leaves.

作者信息

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

机构信息

Department of Natural Sciences, Bonn-Rhein-Sieg University of Applied Sciences von-Liebig-Straße 20 D-53359 Rheinbach Germany

Spectral Service AG Emil-Hoffmann-Strasse 33 D-50996 Köln Germany.

出版信息

RSC Adv. 2020 Mar 13;10(18):10740-10751. doi: 10.1039/c9ra10576j. eCollection 2020 Mar 11.

DOI:10.1039/c9ra10576j
PMID:35492943
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9050404/
Abstract

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 , a commonly studied genotype, and , which is relatively understudied but has useful properties such as increased frost resistance and higher stem stability. Samples of (Gig35) and (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 °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 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 showed increasing H and decreasing G unit content over the studied harvesting period (December-April).

摘要

作物具有非常吸引人的特性，如高光合作用产量和碳固定率。由于这些特性，目前它被考虑用于第二代生物精炼厂。在这里，我们分析了一种常用研究基因型与另一种相对研究较少但具有有用特性（如抗冻性增强和茎稳定性更高）的基因型之间的化学成分差异。已按植物部分（叶和茎）对（Gig35）和（NagG10）的样本进行了分离，以分离出相应的木质素。采用有机溶剂法进行生物质制浆（80%乙醇溶液，170°C，15巴）。使用成分分析、傅里叶变换红外光谱（FTIR）、紫外可见光谱（UV-Vis）、核磁共振光谱（NMR）、热重分析（TGA）、尺寸排阻色谱（SEC）和热解气相色谱/质谱联用（Py-GC/MS）对生物质成分和木质素结构进行分析，以确定分离出的木质素的三维结构、单体木质醇比例以及取决于基因型和收获季节的最丰富的连接方式。SEC数据显示，茎和叶衍生的木质素在分子量和多分散指数方面存在显著差异。Py-GC/MS和异核单量子相关（HSQC）NMR揭示了两种基因型（Gig35、NagG10）的单体木质醇组成不同。单体木质醇比例受收获时间的影响较小：在研究的收获期（12月至4月）内，（某作物）茎衍生的木质素显示出H单位含量增加，G单位含量减少。

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