Ninawe Suchita, Kuhad Ramesh Chander
Department of Biotechnology, Ministry of Science and Technology, Government of India, CGO Complex, New Delhi, India.
Bioresour Technol. 2006 Dec;97(18):2291-5. doi: 10.1016/j.biortech.2005.10.035. Epub 2005 Dec 6.
An alkalistable endoxylanase from Streptomyces cyaneus SN32 was applied in bleaching of wheat straw enriched soda pulp. The xylanase dose of 10 IUg(-1) moisture free pulp exhibited maximum bleach boosting of soda pulp (pH 9.5-10.0) optimally at 65 degrees C after 2 h of reaction time. Pre-treatment of pulp with xylanase and its subsequent treatment with 6% hypochlorite reduced the kappa number by 8.7%, enhanced the brightness index by 3.56% and improved other paper properties such as tear index and burst index. The enzymatically-prebleached pulp when treated with 10% reduced level of hypochlorite (5.4%) gave comparable brightness of resultant hand sheets to the fully bleached pulp (6% hypochlorite).
来自青色链霉菌SN32的一种耐碱内切木聚糖酶被应用于富含小麦秸秆的苏打浆的漂白。在65摄氏度下反应2小时后，每克绝干浆10国际单位的木聚糖酶剂量对苏打浆（pH 9.5 - 10.0）表现出最大的漂白促进作用。用木聚糖酶对纸浆进行预处理，随后用6%的次氯酸盐处理，可使卡伯值降低8.7%，亮度指数提高3.56%，并改善其他纸张性能，如撕裂指数和耐破指数。当用10%降低水平的次氯酸盐（5.4%）处理经酶预漂白的纸浆时，所得手抄片的亮度与完全漂白的纸浆（6%次氯酸盐）相当。
