Bleaching of wheat straw-rich soda pulp with xylanase from a thermoalkalophilic Streptomyces cyaneus SN32.
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).
Ninawe
Suchita
S
Department of Biotechnology, Ministry of Science and Technology, Government of India, CGO Complex, New Delhi, India. sninawe@dbt.nic.in
Kuhad
Ramesh Chander
RC
D000468:Alkalies; D003116:Color; D043364:Endo-1,4-beta Xylanases / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D010209:Paper; D013302:Streptomyces / Q000201:enzymology*; D014908:Triticum; D014934:Wood
D000468:Alkalies; D043364:Endo-1,4-beta Xylanases