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首页> 外文期刊>Holzforschung >Molar mass determination of lignins by size-exclusion chromatography: towards standardisation of the method
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Molar mass determination of lignins by size-exclusion chromatography: towards standardisation of the method

机译：摩尔质量测定木质素的尺寸排阻色谱法：方法的标准化

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摘要

The reactivity and physicochemical properties of lignins are partly governed by their molar mass distribution. The development of reliable standard methods for determination of the molar mass distribution is not only relevant for designing technical lignins for specific applications, but also for monitoring and elucidating delignification and pulping processes. Size-exclusion chromatography (SEC) offers many advantages, such as wide availability, short analysis time, low sample demand, and determination of molar mass distribution over a wide range. A collaborative study has been undertaken within the "Eurolignin" European thematic network to standardise SEC analysis of technical lignins. The high-molar-mass fraction of polydisperse lignins was shown to be the main source of intra- and interlaboratory variations, depending on the gel type, elution solvent, detection mode, and calculation strategy. The reliability of two widespread systems have been tested: one based on alkali and a hydrophilic gel (e.g., TSK Toyopearl gel) and the other based on THF as solvent and polystyrene-based gels (e.g., Styragel). A set of practical recommendations has been deduced.
机译：木质素的反应性和理化性质部分受其摩尔质量分布支配。确定摩尔质量分布的可靠标准方法的开发不仅与设计特定用途的工业木质素有关，而且与监测和阐明脱木质素和制浆过程有关。体积排阻色谱法（SEC）具有许多优势，例如可用性高，分析时间短，样品需求低以及在宽范围内确定摩尔质量分布。已在“ Eurolignin”欧洲主题网络内进行了一项合作研究，以标准化SEC对技术木质素的分析。根据凝胶类型，洗脱溶剂，检测模式和计算策略，多分散木质素的高摩尔分数是实验室内部和实验室间变化的主要来源。已经测试了两种广泛使用的系统的可靠性：一种基于碱和亲水性凝胶（例如TSK Toyopearl凝胶），另一种基于THF作为溶剂的溶剂和聚苯乙烯基凝胶（例如Styragel）。得出了一系列实用建议。

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