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首页> 外文期刊>Journal of Polymers and the Environment >Combining Electrophoretic and Fluorescence Method for Screening Fine Structural Variations Among Lignin Model Polymers Differing in Monomer Composition
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Combining Electrophoretic and Fluorescence Method for Screening Fine Structural Variations Among Lignin Model Polymers Differing in Monomer Composition

机译：电泳和荧光结合法筛选单体组成不同的木质素模型聚合物的精细结构变异

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摘要

Due to the challenges of cell walls (biomass) and its applications in various new technologies, there is a need of rapid and reliable screening of fine variations in lignin structure. The in vitro synthesized lignin model polymers are good experimental system to relate lignin structure/properties with its applications. We used iso-electric focusing electrophoresis (IEF) and fluorescence spectroscopy for screening fine structural variations in lignin model polymers, synthesized from the three lignin monomers, coniferyl alcohol, ferulic acid and p-coumaric acid, mixed in various ratios. The results were related with the thermal behavior of the polymers, revealed by differential scanning calorimetry. Each polymer had characteristic IEF pattern that can be used as its fingerprint. On the basis of the number and intensity of particular bands, it is possible to detect fine differences between polymer patterns, associated with the charge distribution on the polymer fractions. The blue shift of the main fluorescence maximum position of the polymers increased in the same order as temperature of glass transition, i. e. (polymer from coniferyl alcohol)>[polymer from coniferyl alcohol and ferulic acid 9: 1 (w/w)>[(polymer from coniferyl alcohol, ferulic acid and p-coumaric acid 8: 1: 1)>(polymer from coniferyl alcohol and p-coumaric acid 9: 1). The results show that the proposed combination of the fluorescence method and IEF may be used to gain complementary information on fine structural differences among the polymers, and influence of the types and ratios of the monomers building the polymer structure.
机译：由于细胞壁（生物质）的挑战及其在各种新技术中的应用，需要对木质素结构的细微变化进行快速可靠的筛选。体外合成的木质素模型聚合物是将木质素结构/性质与其应用相关联的良好实验体系。我们使用等电聚焦电泳（IEF）和荧光光谱法筛选了木质素模型聚合物中的精细结构变化，该聚合物是由三种木质素单体，松柏醇，阿魏酸和对香豆酸按不同比例混合而成的。结果与聚合物的热行为有关，通过差示扫描量热法显示。每种聚合物均具有可以用作其指纹的特征性IEF模式。基于特定带的数量和强度，可以检测与聚合物级分上的电荷分布相关的聚合物图案之间的细微差异。聚合物的主要荧光最大位置的蓝移以与玻璃化转变温度相同的顺序增加，即。 e。 （来自松柏醇的聚合物）> [来自松柏醇和阿魏酸的聚合物9：1（w / w）> [（来自松柏醇，阿魏酸和对香豆酸的聚合物8：1：1）>（来自松柏醇的聚合物和对香豆酸9：1）。结果表明，所提出的荧光方法和IEF的组合可用于获得有关聚合物之间细微结构差异以及构成聚合物结构的单体类型和比例的影响的补充信息。

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