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Applied Biochemistry and Biotechnology

, Volume 149, Issue 1, pp 45–51 | Cite as

Overproduction of Laccase and Pectinase by Microbial Associations in Solid Substrate Fermentation

  • Ivanka Stoilova
  • Albert Krastanov
Article

Abstract

The growth and the enzymatic production of two microbial fungal associations were studied: Aspergillus niger and Fusarium moniliforme and Trametes versicolor and Aspergillus niger. The synergistic interrelations between the species of the first mixed culture increased the biosynthesis of α-amylase and pectinase. T. versicolor and A. niger proved to be compatible partners in the overproduction of the enzyme laccase, whose synthesis surpassed 8.4 times the enzymatic level in the monoculture, with both of the mixed microbial populations cocultivation facilitating the amplified synthesis of enzymes rather than their growth acceleration. A further proof of the presence of synergism established by the cultures was the enzyme volumetric productivities in both of the mixed microbial cultures, which increased parallel to the rise in the combined biomass synthesis. The competent selection of compatible partners can adjust the desired enzymatic levels and compositions in mixed fungal systems aimed at a number of specified designations. Thus, a very high level of laccase production (97,600 IU/g dry weight) was achieved. The chosen fungal strains produce a variety of different enzymes, but first microbial association produces mainly amylase and pectinase, necessary for their growth, and second association produces mainly laccase and pectinase.

Keywords

Solid substrate fermentation Laccase Pectinase Mixed fungal culture 

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Copyright information

© Humana Press Inc. 2007

Authors and Affiliations

  1. 1.Department of BiotechnologyUniversity of Food TechnologiesPlovdivBulgaria

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