Production and localisation of carboxymethylcellulase, xylanase and ?-glucosidase fromCellulomonas andMicrococcus spp.

Saxena, Shailendra K.; Bahadur, J.; Varma, Ajit

doi:10.1007/bf00167920

Cited by 21 publications

(7 citation statements)

References 11 publications

(8 reference statements)

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“…(xylanase, 9.33 U ml 31 and CMCase, 0.94 U ml 31 ), Micrococcus sp. (xylanase, 3.33 U ml 31 and CMCase, 3.11 U ml 31 ) [47] and Streptomyces roseiscleroticus NRRL-B-11019 (xylanase, 16.2 IU ml 31 and cellulase, 0.21 IU ml 31 ) [49]. A detailed description of all other organisms producing cellulases along with xylanases are given in Table 1.…”

Section: Panorama Of Bacterial Xylanasesmentioning

confidence: 99%

Cellulase-free xylanases from Bacillus and other microorganisms

Subramaniyan

2000

FEMS Microbiology Letters

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Xylanases are used mainly in the pulp and paper industries for the pretreatment of Kraft pulp prior to bleaching to minimize use of chlorine, the conventional bleaching agent. This application has great potential as an environmentally safe method. Hydrolysis by xylanases of relocated and reprecipitated xylan on the surface of cellulose fibres formed during Kraft cooking facilitates the removal of lignin by increasing permeability to oxidising agents. Most of the xylanases reported in the literature contained significant cellulolytic activity, which make them less suitable for pulp and paper industries. The need for large quantities of xylanases which would be stable at higher temperatures and pH values and free of cellulase activity has necessitated a search for novel enzymes. We have isolated and characterised several xylanase‐producing cultures, one of which (an alkalophilic Bacillus SSP‐34) produced more than 100 IU ml−1 of xylanase activity. The SSP‐34 xylanases have optimum activity at 50°C in a pH range 6–8, with only small amounts of cellulolytic activity (CMCase (0.4 IU ml−1, pH 7), FPase (0.2 IU ml−1, pH 7) and no activity at pH 9).

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Section: Panorama Of Bacterial Xylanasesmentioning

confidence: 99%

Cellulase-free xylanases from Bacillus and other microorganisms

Subramaniyan

2000

FEMS Microbiology Letters

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“…Among the cellulose de- graders, a mesophilic Bacillus sp. [49] also isolated a Micrococcus sp. Similarly, Saxena ct al.…”

Section: Polysaccharide-depolymerizing Microorgan-mentioning

confidence: 99%

“…Similarly, Saxena ct al. [49] also isolated a Micrococcus sp. which is able to produce all the three enzymes.…”

Section: Polysaccharide-depolymerizing Microorgan-mentioning

confidence: 99%

Lignocellulose degradation by microorganisms from termite hills and termite guts: A survey on the present state of art

Varma

Kolli

Paul

et al. 1994

FEMS Microbiology Reviews

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In several aspects termites are a fascinating group of insects having attracted the interest of many researchers. They exhibit a complex social behavior and caste differentiation occurring elsewhere only among the hymenoptera. In an enlarged part of the hindgut, the paunch, termites have established a unique symbiotic association with prokaryotic and eukaryotic microorganisms. A similar flora is also found in wood‐eating roaches of the genus Cryptocercus. The study of symbiosis between termites and their intestinal microbes is of general interest, because due to this symbiotic interaction termites can feed on complex biopolymers such as wood. Flagellates and bacteria occur in the gut of lower termites, while higher termites possess only bacteria. In particular spirochetes are abundant in the termite gut. Apart from spirochetes and other more common bacteria, actinomycetes, yeasts and fungi have also been isolated from different species of termites. This review summarizes the distinct role of the intestinal flora in degradation of wood components such as cellulose, hemicellulose and lignin.

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“…(xylanase, 9.33 U ml −1 and CMCase, 0.94 U ml −1 ), Micrococcus sp. (xylanase, 3.33 U ml −1 and CMCase, 3.11 U ml −1 ) [47] and Streptomyces roseiscleroticus NRRL‐B‐11019 (xylanase, 16.2 IU ml −1 and cellulase, 0.21 IU ml −1 ) [49]. A detailed description of all other organisms producing cellulases along with xylanases are given in Table 1.…”

Section: Panorama Of Bacterial Xylanasesmentioning

confidence: 99%

Cellulase-free xylanases fromBacillusand other microorganisms

Subramaniyan¹,

Prema²

2000

FEMS Microbiology Letters

134

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Xylanases are used mainly in the pulp and paper industries for the pretreatment of Kraft pulp prior to bleaching to minimize use of chlorine, the conventional bleaching agent. This application has great potential as an environmentally safe method. Hydrolysis by xylanases of relocated and reprecipitated xylan on the surface of cellulose fibres formed during Kraft cooking facilitates the removal of lignin by increasing permeability to oxidising agents. Most of the xylanases reported in the literature contained significant cellulolytic activity, which make them less suitable for pulp and paper industries. The need for large quantities of xylanases which would be stable at higher temperatures and pH values and free of cellulase activity has necessitated a search for novel enzymes. We have isolated and characterised several xylanase-producing cultures, one of which (an alkalophilic Bacillus SSP-34) produced more than 100 IU ml(-1) of xylanase activity. The SSP-34 xylanases have optimum activity at 50 degrees C in a pH range 6-8, with only small amounts of cellulolytic activity (CMCase (0.4 IU ml(-1), pH 7), FPase (0.2 IU ml(-1), pH 7) and no activity at pH 9).

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Production and localisation of carboxymethylcellulase, xylanase and ?-glucosidase fromCellulomonas andMicrococcus spp.

Cited by 21 publications

References 11 publications

Cellulase-free xylanases from Bacillus and other microorganisms

Cellulase-free xylanases from Bacillus and other microorganisms

Lignocellulose degradation by microorganisms from termite hills and termite guts: A survey on the present state of art

Cellulase-free xylanases fromBacillusand other microorganisms

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