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Cellulose

, Volume 24, Issue 10, pp 4325–4336 | Cite as

Bioconversion of cellulose and simultaneous production of thermoactive exo- and endoglucanases by Fusarium oxysporum

  • Folasade M. OlajuyigbeEmail author
Original Paper
  • 194 Downloads

Abstract

Saccharification of cellulose is a promising method for production of biofuels. However, low bioconversion efficiency of cellulose to soluble sugars is a major challenge. In this study, a cellulolytic strain of Fusarium oxysporum was cultivated on pure cellulosic substrates (avicel, α-cellulose, carboxymethylcellulose and methylcellulose) and conversion efficiency into glucose was investigated. Production of exo- and endoglucanases during the bioconversion process was evaluated. Influence of pH on saccharification of cellulose and enzyme production by F. oxysporum were determined. Highest yield of glucose (1.76 μmol/ml) was obtained from F. oxysporum on methyl cellulose at 192 h under basal conditions. Liberated glucose under optimized condition of pH 6.0 at 96 h of fermentation was 2.12 μmol/ml with maximum production of exo- and endoglucanases (23.70 and 34.72 U/mg protein, respectively). The crude exo- and endoglucanases had optimum activities at pH 8.0, 70 °C and pH 7.0, 50 °C, respectively. The enzymes were stable over pH of 4.0–7.0 with relative residual activity above 60% after 1 h incubation. Exoglucanase activity was enhanced by Ca2+ and Cu2+ at 5 mM and Mg2+ at 10 mM. Endoglucanase activity was greatly enhanced in the presence of Mn2+, Ca2+, Mg2+, Cu2+ and Fe3+ at 5 and 10 mM. Activities of both enzymes were inhibited in the presence of Hg2+ at 5 and 10 mM. Results show that F. oxysporum possessed good cellulolytic enzyme system for efficient conversion of cellulose. Exhibited thermotolerance of exoglucanase with the striking tolerance of endoglucanase to metal ions demonstrate potentials of enzymes for biofuel industry.

Keywords

Bioconversion Cellulose Fusarium oxysporum Endoglucanase Exoglucanase Glucose 

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Enzyme Biotechnology and Environmental Health Unit, Department of BiochemistryFederal University of TechnologyAkureNigeria

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