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首页> 外文会议>New Technologies in Non-wood Fiber Pulping and Papermaking >STRUCTURE CHANGES OF RESIDUAL LIGNIN IN STRAW SODA PULP TREATED WITH MANGANESE PEROXIDASE
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STRUCTURE CHANGES OF RESIDUAL LIGNIN IN STRAW SODA PULP TREATED WITH MANGANESE PEROXIDASE

机译：锰过氧化物酶处理的苏打浆中残余木质素的结构变化

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摘要

Cellulolytic enzyme liginin (CEL) from straw soda pulp was prepared and treated with Manganese peroxidase (MnP) secreted from white rot fungus Phanerochaete sordida YK-624. Molecular weight and its distribution were analyzed and structural changes were traced by determining functional groups, -OCH_3, -COOH, ph-OH, conjugated carbonyl and quinones. Combined with results of element composition, alkali nitrobenzene oxidation, IR and ~1H-NMR spectra, the possible changes of residual lignin in straw pulp were learned. CEL isolated from straw pulp had lower molecular weight, high content of ph-OH and greater extent of condensation. After MnP treatment, molecular weight increased and its distribution showed there were degradation and condensation at same time during MnP treatment. -OCH_3 content decreased and ph-OH increased. Conjugated carbonyl and quinones content increased, which was the main reason of lower brightness gain of straw pulp than that of hardwood pulp after bleaching with MnP. These two groups could also explain the fact of enhancement extractability by alkali and bleachability by peroxide of treated straw pulp by MnP. MQP was reasonable total chlorine free bleaching process for straw pulp.
机译：制备了秸秆苏打浆中的纤维素分解素木质素（CEL），并用白腐真菌Phanerochaete sordida YK-624分泌的锰过氧化物酶（MnP）处理。通过测定官能团，-OCH_3，-COOH，ph-OH，共轭羰基和醌，分析分子量及其分布并追踪结构变化。结合元素组成，碱式硝基苯氧化，IR和〜1H-NMR谱图的结果，了解了草浆中残留木质素的可能变化。从草浆中分离出的CEL具有较低的分子量，较高的ph-OH含量和较大的缩合度。 MnP处理后，分子量增加，其分布表明在MnP处理期间同时发生降解和缩合。 -OCH_3含量降低而ph-OH升高。 MnP漂白后，共轭羰基和醌含量增加，这是秸秆纸浆增白率低于硬木浆增白率的主要原因。这两类也可以解释由MnP处理过的草浆通过碱增强提取性和过氧化物漂白性的事实。 MQP是用于草浆的合理的总无氯漂白工艺。

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