Biobleaching of nonwoody pulps using xylanase of Bacillus brevis BISR-062.
The efficiency of xylanase of Bacillus brevis BISR-062 as a prebleaching agent was evaluated on three nonwoody pulps at two different pH values (7.0 and 8.5). Crude xylanase was found to have an optimum temperature and pH of 65-70 degrees C and 7.0, respectively. The stability of the enzyme was determined at two pH values (7.0 and 8.0), and it lost approx 50% of its activity at both values within 2 h at 50 degrees C. However, the enzyme was found to be effective as a prebleaching agent only with rice straw pulp. A maximum brightness gain of 6 points was obtained with this pulp at pH 7.0. The strength properties of the rice straw pulp at pH 7.0 also improved as the result of enzyme treatment.
Birla Institute of Scientific Research, Statue Circle, Jaipur, 302001, India.
B
B
Choudhury
Preetika
P
Aggarwal
R K
RK
Gothwal
Rahul
R
Mantri
M K
MK
Mohan
P
P
Ghosh
D001407:Bacillus / Q000201:enzymology*; D001709:Biotechnology / Q000379:methods*; D002384:Catalysis; D003116:Color; D004795:Enzyme Stability; D006358:Hot Temperature; D010209:Paper; D018547:Plant Stems / Q000737:chemistry*; D011522:Protons; D033081:Shear Strength; D013696:Temperature; D013718:Tensile Strength; D014990:Xylans / Q000737:chemistry; D014994:Xylose / Q000032:analysis; D014995:Xylosidases / Q000737:chemistry*
D011522:Protons; D014990:Xylans; D014994:Xylose; D014995:Xylosidases