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Enhanced cellulase production by a novel thermophilic Bacillus licheniformis 2D55: characterization and application in lignocellulosic saccharification


Citation

Kazeem, Muinat Olanike and Md Shah, Umi Kalsom and Baharuddin, Azhari Shamsu and Abdul Rahman, Nor' Aini (2016) Enhanced cellulase production by a novel thermophilic Bacillus licheniformis 2D55: characterization and application in lignocellulosic saccharification. BioResources, 11 (2). pp. 5404-5423. ISSN 1930-2126

Abstract

Effects of nutritional and physicochemical factors were investigated for cellulase production by the newly isolated thermophilic strain Bacillus licheniformis 2D55 (Accession No. KT799651). The optimum cellulase production in shake flask fermentation was attained at 60 °C, pH 3.5, 180 rpm, and in a medium containing untreated sugarcane bagasse and pre-treated rice husk at 7% (w/v), urea, 1 g/L, peptone, 11.0 g/L, Mg(SO4)2, 0.40 g/L, CaCl2, 0.03 g/L, Tween 80, 0.2% (w/v), and 3% inoculum. The highest carboxymethyl cellulase (CMCase), filtre paperase (FPase), and β-glucosidase produced under the optimized conditions were 29.4 U/mL, 12.9 U/mL, and 0.06 U/mL, respectively, after 18 h of fermentation. Optimization of the parameters increased the CMCase, FPase, and β-glucosidase activities by 77.4-fold, 44.5-fold, and 10-fold, respectively. The crude enzyme was highly active and stable over broad temperature (50 to 80 °C) and pH (3.5 to 10.0) ranges with optimum temperature at 65 °C and 80 ºC for CMCase and FPase, respectively. The optimum pH for CMCase and FPase was 7.5 and 6.0, respectively. Saccharification of sugar cane bagasse and rice husk by crude cellulase resulted in perspective yields of 0.348 and 0.301 g g-1 dry substrate of reducing sugars. These results suggest prospects of thermostable cellulase from B. licheniformis 2D55 in application for bio-sugar production and other industrial bioprocess applications involving high temperatures.


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Additional Metadata

Item Type: Article
Subject: Bacillus licheniformis 2D55; Thermostable cellulase; Lignocellulosic saccharification; Optimization
Divisions: Faculty of Biotechnology and Biomolecular Sciences
Publisher: North Carolina State University
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 01 Mar 2018 07:58
Last Modified: 01 Mar 2018 07:58
URI: http://psasir.upm.edu.my/id/eprint/54159
Statistic Details: View Download Statistic

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