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Amelioration of ligninolytic enzyme production by Phanerochaete chrysosporium in airlift bioreactors
Authors:A. Domínguez  S. Rodríguez Couto  A. Sanromán
Affiliation:(1) Department of Chemical Engineering, University of Vigo, 36200 Vigo, Spain
Abstract:Maximum activities of manganese-dependent peroxidase (MnP) and lignin peroxidase (LiP) in free cultures of Phanerochaete chrysosporium (ATCC 24725) were 258 U l–1 and 103 U l–1, respectively, in an airlift bioreactor. Immobilisation of the fungus on an inert carrier as well as several design modifications of the bioreactor employed gave MnP activities around 500–600 U l–1 during 9 days' operation. The continuous operation of the latter led to MnP and LiP activities about 140 U l–1 and 100 U l–1, respectively, for two months, without operational problems. Furthermore, the extracellular liquid secreted decolourised the polymeric dye Poly R-478 about 56%.
Keywords:airlift bioreactor  lignin peroxidase  manganese-dependent peroxidase  nylon sponge  Phanerochaete chrysosporium
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