Abstract

The dynamics of wheat straw delignification with ozone treatment is studied. The dependence of the residual lignin content on the specific absorption of ozone is determined. It is found that in a prolonged stage of ozonation, ozone is consumed mostly for the reaction with lignin. HPLC is used to record kinetic profiles of water-soluble products of ozonation. The IR spectra of straw samples with various degrees of delignification are analyzed. The results confirm the ozonolytic degradation of lignin and suggest that polysaccharides undergo partial oxidation during prolonged ozonation. A relationship is found between the lignin content and the reactivity of ozone-pretreated straw in enzymatic hydrolysis to sugars. The optimum consumption of ozone is 2 mol-equiv O₃ per phenylpropane structural unit (PPU) of the lignin contained in the straw, which corresponds to a residual lignin content of ~10%.

中文翻译：

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麦秸的臭氧分解脱木素

摘要

研究了臭氧处理麦秸脱木质素的动力学。确定残余木质素含量对臭氧的比吸收的依赖性。发现在臭氧化的延长阶段中，臭氧主要消耗用于与木质素的反应。HPLC用于记录臭氧化的水溶性产物的动力学曲线。分析了具有不同脱木素度的稻草样品的红外光谱。结果证实了木质素的臭氧分解降解，并表明多糖在长时间的臭氧化过程中会发生部分氧化。发现木质素含量与臭氧预处理的稻草在酶促水解成糖的反应性之间存在关系。臭氧的最佳消耗量为2摩尔当量的O ₃ 秸秆中木质素的每苯基丙烷结构单元（PPU）的含量，相当于残留木质素含量约为10％。