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Appl Environ Microbiol. 1988 April; 54(4): 1015-1022
Copyright © 1988, American Society for Microbiology. All Rights Reserved.

Biotransformation of Dehydroabietic, Abietic, and Isopimaric Acids by Mortierella isabellina Immobilized in Polyurethane Foam

James P. Kutney*, Jean-Daniel Berset, Gary M. Hewitt and Mahatam Singh

Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Y6, Canada

ABSTRACT

Polyurethane foam supports immobilization of Mortierella isabellina ATCC 38063, a zygomycete that hydroxylates and thereby detoxifies resin acids found in certain pulp mill effluents. The fungus becomes entrapped as it threads growing mycelia through the open foam matrix. The tenacity of binding and the amount of biomass bound depend on initial spore numbers and nutrient concentration. Optimal dehydroabietic acid transformation occurs with early-stationary-phase foam-bound mycelia suspended in buffer at pH 6.5 to 8.5 with aeration >0.1 liter liter–1 min–1 and near a temperature maximum of 33°C. Neither a greater number of similarly loaded foam cubes nor a greater surface area for similar amounts of biomass increased transformation rates. Compared to free mycelial cultures, foam presence retards growth and decreases the rate of precursor transformation but does not alter the nature of the metabolites formed from dehydroabietic acid, abietic acid, or isopimaric acid. Diffusional barriers or binding of substrates in an inaccessible manner may cause the observed inhibitions. Overall, foam immobilization stabilizes enzymic activity and is a facile laboratory process with scaleup potential.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1988 April; 54(4): 1015-1022
Copyright © 1988, American Society for Microbiology. All Rights Reserved.





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Copyright © 1988 by the American Society for Microbiology. All rights reserved.