Production and characterization of a thermostable β-glucosidase from Myceliophthora heterothallica

Authors

  • Maria Eduarda da Mata Martins Universidade do Estado de Minas Gerais
  • Eduardo da Silva Martins Universidade do Estado de Minas Gerais
  • Heytor Lemos Martins Universidade do Estado de Minas Gerais

DOI:

https://doi.org/10.14393/BJ-v36n1a2020-47758

Keywords:

β-glucosidase, Fungus, Myceliophthora heterothallica, Solid-state cultivation

Abstract

The conversion of biomass from agro-industrial residues into bioproducts is of great interest, especially to Brazil, where bioenergy has a huge potential for development. Enzymes involved in biodegradation of lignocellulosic biomass are those of the cellulase system, of which β-glucosidase is a constituent. The production and characterization of β-glucosidase by the thermophilic fungus Myceliophthora heterothallica by solid-state cultivation on different agro-industrial residues (sugarcane bagasse, sugarcane straw, wheat bran and a mixture of these three materials (1:1:1 w/w) was evaluated. Solid-state cultivation were conducted in 250 mL Erlenmeyer flasks, with 5 g of each substrate. Different culture parameters, such as supplementary nutrient solution to the substrate, supplementary nutrient solution pH, initial substrate moisture and fungus incubation temperature, were evaluated to establish conditions of higher enzyme production by the fungus The greatest production of enzymes occurred in a mixture of wheat bran, sugarcane bagasse and straw bagasse (1:1:1). The activity of β-glucosidase was greater under the following conditions: nutrient solution composed of NH4NO3, MgSO4.7H2O and (NH4)2SO4 (0.1%), at pH 4.5 or 6.0, fungus incubation at 40°C or 45°C, initial moisture of substrate at 80%. Enzyme presented optimum pH at pH 5.0 and good pH stability. Best temperature was 65°C and enzyme showed 100% stability for 1h, up to 60°C. The use of agro-industrial residues provided good production of β-glucosidase by fungus, with enzyme having the characteristics desirable from the industrial application.

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Published

2020-01-01

How to Cite

MARTINS, M.E. da M., MARTINS, E. da .S. and MARTINS, H.L., 2020. Production and characterization of a thermostable β-glucosidase from Myceliophthora heterothallica. Bioscience Journal [online], vol. 36, no. 1, pp. 212–222. [Accessed2 December 2022]. DOI 10.14393/BJ-v36n1a2020-47758. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/47758.

Issue

Section

Biological Sciences