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Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
ISSN: 1596-5996
EISSN: 1596-9827
Vol. 14, No. 4, 2015, pp. 591-598
Bioline Code: pr15077
Full paper language: English
Document type: Research Article
Document available free of charge

Tropical Journal of Pharmaceutical Research, Vol. 14, No. 4, 2015, pp. 591-598

 en Purification and Characterization of Thermostable Cellulase from Consortium XM70 in Terrestrial Hot Spring with Sugarcane Bagasse
Zhao, Chao; Lu, Xiong; Deng, Yunjin; Huang, Yifan & Liu, Bin

Abstract

Purpose: To better understand the sugarcane bagasse (SCB) degradation process and obtain thermostable cellulase from terrestrial hot spring.
Methods: Molecular community structure of the newly selected thermophilic bacterial consortium XM70 was determined using the method of the full-length 16S rRNA library-based analysis. The thermostable CMCase was purified with ion-exchange and gel filtration chromatography.
Results: Sequence-based identification of species belonging to the genera, Geobacillus check for this species in other resources , Desulfotomaculum check for this species in other resources , Bacillus check for this species in other resources , Exiguobacterium check for this species in other resources , Paenibacillus check for this species in other resources and Enterobacter check for this species in other resources were identified. The maximal activities of carboxymethyl cellulase (CMCase), filter paper cellulase and β-glucosidase of the consortium XM70 were obtained after incubation at 60 °C and pH 6.0 (4 days), 80 °C and pH 7.0 (2 days) and 70 °C and pH 8.0 (4 days), respectively. The yield of reducing sugars in the culture broth achieved 0.11 g.g-1 dry SCB. An extracellular CMCase from consortium XM70 (XM70-CMCase) was purified 7.9-fold to apparent homogeneity with a recovery of 65.41 % and its molecular mass was about 31.0 kDa. Maximum CMCase activity of the purified XM70-CMCase was 3.77 U/mg at 70 °C and pH 7.0. CMCase activity maintained about its maximal value of 70 % after incubation at 80 °C for 60 min.
Conclusion: Due to its high temperature stability, the purified XM70-CMCase may be useful for industrial application such as biofuel, animal feed industry, paper industry and clarification of fruit juices.

Keywords
Thermostable cellulase; Sugarcane bagasse; Purification; Characterization; Hot spring

 
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