Natural mediators in the oxidation of polycyclic aromatic hydrocarbons by laccase mediator systems
The oxidation of polycyclic aromatic compounds was studied in systems consisting of laccase from Trametes versicolor and so-called mediator compounds. The enzymatic oxidation of acenaphthene, acenaphthylene, anthracene, and fluorene was mediated by various laccase substrates (phenols and aromatic amines) or compounds produced and secreted by white rot fungi. The best natural mediators, such as phenol, aniline, 4-hydroxybenzoic acid, and 4-hydroxybenzyl alcohol were as efficient as the previously described synthetic compounds ABTS [2,2{prime}-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid)] and 1-hydroxybenzotriazole. The oxidation efficiency increased proportionally with the redox potentials of the phenolic mediators up to a maximum value of 0.9 V and decreased thereafter with redox potentials exceeding this value. Natural compounds such as methionine, cysteine, and reduced glutathione, containing sulfhydryl groups, were also active as mediator compounds.
- Research Organization:
- Univ. of Goettingen (DE)
- OSTI ID:
- 20026701
- Journal Information:
- Applied and Environmental Microbiology, Vol. 66, Issue 2; Other Information: PBD: Feb 2000; ISSN 0099-2240
- Country of Publication:
- United States
- Language:
- English
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