dc.contributorUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:20:37Z
dc.date.available2014-05-27T11:20:37Z
dc.date.created2014-05-27T11:20:37Z
dc.date.issued2003-03-01
dc.identifierApplied Biochemistry and Biotechnology - Part A Enzyme Engineering and Biotechnology, v. 106, n. 1-3, p. 393-402, 2003.
dc.identifier0273-2289
dc.identifierhttp://hdl.handle.net/11449/67208
dc.identifier10.1385/ABAB:106:1-3:393
dc.identifierWOS:000182725000036
dc.identifier2-s2.0-0038071730
dc.identifier7091241742851920
dc.identifier9424175688206545
dc.description.abstractThe alkalophilic Bacillus circulans D1 was isolated from decayed wood. It produced high levels of extracellular cellulase-free xylanase. The enzyme was thermally stable up to 60°C, with an optimal hydrolysis temperature of 70°C. It was stable over a wide pH range (5.5-10.5), with an optimum pH at 5.5 and 80% of its activity at pH 9.0. This cellulase-free xylanase preparation was used to biobleach kraft pulp. Enzymatic treatment of kraft pulp decreased chlorine dioxide use by 23 and 37% to obtain the same kappa number (κ number) and brightness, respectively. Separation on Sephadex G-50 isolated three fractions with xylanase activity with distinct molecular weights.
dc.languageeng
dc.relationApplied Biochemistry and Biotechnology - Part A Enzyme Engineering and Biotechnology
dc.relation1.797
dc.relation0,571
dc.rightsAcesso aberto
dc.sourceScopus
dc.subjectBacillus circulans
dc.subjectBiobleaching
dc.subjectKraft pulp
dc.subjectThermophilic
dc.subjectXylanase
dc.subjectcellulase
dc.subjectchlorine dioxide
dc.subjectenzyme
dc.subjectsephadex
dc.subjectxylan endo 1,3 beta xylosidase
dc.subjectbleaching
dc.subjectbrightness
dc.subjectconference paper
dc.subjectenzyme activity
dc.subjectenzyme isolation
dc.subjectenzyme stability
dc.subjectEucalyptus
dc.subjectextracellular space
dc.subjecthydrolysis
dc.subjectisolation procedure
dc.subjectmolecular weight
dc.subjectnonhuman
dc.subjectpH
dc.subjectpulp processing
dc.subjectseparation technique
dc.subjecttemperature
dc.subjectthermostability
dc.subjectwood
dc.subjectBacillus
dc.subjectBiotechnology
dc.subjectCellulase
dc.subjectEndo-1,4-beta Xylanases
dc.subjectEnzyme Stability
dc.subjectHydrogen-Ion Concentration
dc.subjectHydrolysis
dc.subjectKinetics
dc.subjectThermodynamics
dc.subjectXylans
dc.subjectXylosidases
dc.titleEffect of Bacillus circulans D1 thermostable xylanase on biobleaching of eucalyptus kraft pulp
dc.typeActas de congresos


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