Choudhury B, Aggarwal P, Gothwal RK, Mantri R, Mohan MK, Ghosh P. Biobleaching of nonwoody pulps using xylanase of Bacillus brevis BISR-062.
Appl Biochem Biotechnol 2006;
128:159-70. [PMID:
16484725 DOI:
10.1385/abab:128:2:159]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2005] [Revised: 09/02/2005] [Accepted: 09/09/2005] [Indexed: 11/11/2022]
Abstract
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.
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