摘要
本研究用果胶酶、半纤维素酶、果胶酯酶及由以上几种酶组成的复合酶,预处理澜沧荛花皮,以还原糖含量来评价生物酶对非纤维物质的脱除效果,并测试纸浆的得率、卡伯值、纸张物理性能等指标以评价不同生物酶对澜沧荛花皮造纸性能的影响.结果表明,由果胶酶(10 mL)、半纤维素酶(10 mg)、果胶酯酶(10 mL)复配的D1酶对非纤维物质脱除效果最优,D1酶预处理液中还原糖溶出量为7.4％.D1酶预处理后蒸煮所得浆料的卡伯值与对照样A0(未经酶预处理)相比下降了5.3％,纸张白度增加了10.3％.D1酶预处理20天与未经酶预处理的原料分别在K2CO3用量为5％和6％(以Na2O计)的条件下蒸煮,纸张耐折度提高了30.3％、抗张指数提高了14.8％、撕裂指数提高了11.2％,表明生物酶预处理能够减少蒸煮过程中化学品的用量,并提升纸张的物理性能.
Abstract
This study used pectinase,hemicellulase,pectinesterase,and a composite enzyme composed of these enzymes to pretreat the raw materials of Wikstroemia delavayi Lecomte bark. The removal effect of the biocatalyst on non-fiber substances was evaluated by reducing sug-ar content,and the effects of different bio-enzymes on the papermaking performance of Wikstroemia delavayi Lecomte bark were evaluated by testing some indices such as the pulp yield,Kappa value,and physical properties of the paper. The results showed that the D1 enzyme com-pounded by pectinase(10 mL),hemicellulase(10 mg),and pectinesterase(10 mL) had the best removal effect,and the reducing sugar con-tent of the D1 enzyme pretreatment solution was 7.4％. The Kappa value of the pulp obtained from cooking after D1 enzyme pretreatment de-creased by 5.3％ and the whiteness of paper increased by 10.3％ compared with the control sample A0. The D1 enzyme pretreated 20 days and non-enzymatic pretreated raw materials were cooked at 5％ and 6％ K2CO3 (in Na2O),respectively,and folding endurance,tensile index,and tear index of the pretreated papers were increased by 30.3％,14.8％,and 11.2％,respectively,which indicated that the bio-enzymatic pre-treatment was able to reduce the amount of chemicals used in the cooking process and improve the physical properties of the paper.
维普
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