Department of Biotechnology, Kurukshetra University, Kurukshetra, India.
Avantha Center for Industrial Research and Development, Paper Mill Campus, Yamuna Nagar, India.
Environ Sci Pollut Res Int. 2020 Sep;27(27):34574-34582. doi: 10.1007/s11356-020-10119-1. Epub 2020 Jul 17.
In this study, suitability of xylano-pectinolytic enzymes in pulping of wheat straw has been explored. The suitable biopulping conditions were optimized, with xylanase dose of 400 and pectinase dose of 120 IU/g wheat straw, 1:10 (g/ml) material to liquid ratio, 55 °C temperature, 3 h treatment time, 0.75% Tween 80 and pH 8.5. Enzymatic pretreatment efficiently increased the pulpability of wheat straw, generated pulp with higher yield, lower kappa number (15.67%) and rejections (59.65%) in comparison with chemical pulp. The brightness of pretreated wheat straw pulp with enzyme was 16.04% higher than that of the non-enzyme treated wheat straw pulp. The biopulping resulted in 12% reduction of pulping chemicals along with more residual alkali content, in order to achieve similar optical and chemical properties as obtained by 100% chemically treated pulp. Physical properties of pulp also improved after enzymatic pretreatment, increasing burst index (26.50%), tear index (18.22%) and breaking length (5.56%). The enzyme plus chemical (88% pulping chemicals) treated pulp showed improvement in brightness and whiteness, with reduction in yellowness at all bleaching stages. In comparison with chemically bleached pulp, biopulp with reduced alkali dose (88%) had higher breaking length (6.63%), double fold number (51.28%), tear index (2.83%), burst index (24.31%), along with increased viscosity (6.12%) and Gurley porosity (27.50%). These results clearly suggest that biopulping of wheat straw with xylano-pectinolytic enzymes can reduce chemical loading during soda-anthraquinone pulping and also improve the quality of paper. This is the first report demonstrating the biopulping of wheat straw using crude xylano-pectinolytic enzymes.
在这项研究中,探索了木聚糖-果胶酶在麦草制浆中的适用性。优化了合适的生物制浆条件,木聚糖酶用量为 400IU/g 麦草,果胶酶用量为 120IU/g 麦草,料液比为 1:10(g/ml),温度为 55°C,处理时间为 3h,添加 0.75%吐温 80 和 pH8.5。与化学浆相比,酶预处理可有效提高麦草的制浆性能,得到得率更高、卡伯值(15.67%)和筛渣率(59.65%)更低的纸浆。用酶预处理的麦草浆的白度比未经酶处理的麦草浆高 16.04%。生物制浆与 100%化学处理浆相比,可减少 12%的制浆化学品用量,同时保持更多的残碱含量,以达到相似的光学和化学性能。酶预处理还可改善纸浆的物理性能,提高耐破指数(26.50%)、撕裂指数(18.22%)和裂断长(5.56%)。酶加化学(88%制浆化学品)处理的纸浆在所有漂白阶段的白度和亮度均有所提高,同时黄度降低。与化学漂白浆相比,碱用量减少(88%)的生物浆具有更高的裂断长(6.63%)、耐折度(51.28%)、撕裂指数(2.83%)、耐破指数(24.31%),同时具有更高的粘度(6.12%)和葛尔莱透气度(27.50%)。这些结果清楚地表明,用木聚糖-果胶酶对麦草进行生物制浆可以减少苏打-蒽醌制浆过程中的化学品用量,同时提高纸张质量。这是首次报道用粗木聚糖-果胶酶对麦草进行生物制浆。
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