The electron beam irradiation (EBI) of native lignin has received little attention. Thus, its potential use in lignin-based biorefineries is not fully understood. EBI was applied to selected lignin samples and the structural and chemical changes were analyzed, revealing the suitability, limitations, and potential purpose of EBI in wood biorefineries. Isolated milled wood, kraft, and sulfite lignin from beech and eucalyptus were subjected to up to 200 kGy of irradiation. The analysis included gel permeation chromatography for molar masses, heteronuclear single quantum coherence (HSQC)- and ³¹P NMR and headspace gas chromatography-mass spectrometry for functional groups, and thermogravimetric analysis for thermal stability. Most samples resisted irradiation. Subtle changes occurred in the molecular weight distribution and thermal stability of milled wood lignin. EBI was found to be a suitable pretreatment method for woody biomass if the avoidance of lignin condensation and chemical modification is a high priority.

中文翻译：

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木质素抵抗高强度电子束辐照

天然木质素的电子束辐照 (EBI) 很少受到关注。因此，它在基于木质素的生物精炼厂中的潜在用途尚不完全清楚。EBI 应用于选定的木质素样品，并分析了结构和化学变化，揭示了 EBI 在木材生物精炼厂中的适用性、局限性和潜在用途。从山毛榉和桉树中分离出的碾磨木材、牛皮纸和亚硫酸盐木质素经受高达 200 kGy 的辐照。分析包括摩尔质量的凝胶渗透色谱、异核单量子相干 (HSQC) - 和³¹P NMR 和顶空气相色谱-质谱法测定官能团，热重分析测定热稳定性。大多数样品抗辐照。磨碎的木质素的分子量分布和热稳定性发生了微妙的变化。如果避免木质素缩合和化学改性是一个高度优先事项，则发现 EBI 是一种合适的木质生物质预处理方法。