Crude xylanase preparations from Penicillium corylophilum, Aspergillus niger and Trichoderma longibrachiatum were used to treat Eucalyptus kraft pulp, prior to chlorine dioxide and alkaline bleaching sequences. The enzyme pretreatment improved brightness and delignification of non-delignified and oxygen-bleached samples of eucalyptus kraft pulp. Xylanase preparations from T. longibrachiatum and P. corylophilum were more effective to reduce pulp kappa number. A small reduction in viscosity was obtained when the oxygen-bleached pulp was treated with xylanase preparation from A. niger. For all enzyme samples, the best release of chromophoric material from the pulp was at 237 nm. The enzyme preparation from P. corylophilum was responsible for the highest release of reducing sugar at a dosage interval of 10-20 IU/g dry weight pulp. Scanning electron microscopy studies of oxygen-bleached pulp after xylanase treatment revealed morphological changes, including holes, cracks, filament forming and peeling.
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机译：在二氧化氯和碱性漂白步骤之前，将来自耐青霉，黑曲霉和长木霉的粗木聚糖酶制剂用于处理桉树牛皮纸浆。酶预处理可改善桉树牛皮纸浆未去木质素和氧漂白样品的亮度和去木质素。来自长木僵菌和嗜酸假单胞菌的木聚糖酶制剂更有效地减少纸浆κ值。当用来自黑曲霉的木聚糖酶制剂处理氧漂白的纸浆时，粘度降低很小。对于所有酶样品，发色物质从果肉中的最佳释放是在237 nm。在10-20 IU / g干重果肉的剂量范围内，来自P. corylophilum的酶制剂负责还原糖的最高释放。木聚糖酶处理后的氧漂白纸浆的扫描电子显微镜研究显示形态变化，包括孔，裂纹，细丝形成和剥落。
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