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.
Choudhury
B
B
Birla Institute of Scientific Research, Statue Circle, Jaipur, 302001, India.
Aggarwal
Preetika
P
Gothwal
R K
RK
Mantri
Rahul
R
Mohan
M K
MK
Ghosh
P
P
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