嗜热脂肪芽孢杆菌 SDX 粗木聚糖酶对麦草浆的增白作用。
Bleach-boosting effect of crude xylanase from Bacillus stearothermophilus SDX on wheat straw pulp.
机构信息
Department of Biotechnology, Kurukshetra University, Kurukshetra 136 119, India.
出版信息
N Biotechnol. 2011 Jan 31;28(1):58-64. doi: 10.1016/j.nbt.2010.07.020. Epub 2010 Aug 10.
Pretreatment of wheat straw pulp using cellulase-free xylanase produced from Bacillus stearothermophilus SDX at 60°C for 120min resulted in 4.75% and 22.31% increase in brightness and whiteness, respectively. Enzyme dose of 10U/g of oven dried pulp at pH 9 decreased the kappa number and permanganate number by 7.14% and 5.31%, respectively. Further chlorine dioxide and alkaline bleaching sequences (CDED(1)D(2)) resulted in 1.76% and 3.63% increase in brightness and whiteness, respectively. Enzymatic prebleaching of pulp decreased 20% of chlorine consumption without any decrease in brightness. Improvement in various pulp properties like viscosity, burst factor, burstness, breaking length, double fold, gurley porosity, tear factor, and tearness were also observed after bleaching of xylanase treated wheat straw pulp.
用嗜热脂肪芽孢杆菌 SDX 产生的无纤维素酶木聚糖酶预处理小麦草浆，在 60°C 下处理 120min，可分别使亮度和白度提高 4.75%和 22.31%。酶用量为 10U/g 风干浆，pH 值为 9，可使卡伯值和高锰酸盐值分别降低 7.14%和 5.31%。进一步采用二氧化氯和碱性漂白序列（CDED(1)D(2)），可使亮度和白度分别提高 1.76%和 3.63%。酶预处理可在不降低亮度的情况下降低 20%的氯耗。在用木聚糖酶处理的小麦草浆进行漂白后，还观察到各种纸浆性能的改善，如粘度、耐破度因子、耐破度、裂断长、双折、透气度、撕裂度因子和撕裂度。
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