When considering phenoloxidases as agents in treating chemical pollution in soil and groundwater environments, possible effects of the specific soil constituents and environmental factors on these enzymes should be investigated. In our invitro experiments various aromatic amines and alkyl or halogensub-stituted phenols were oxidized by a laccase and a tyrosinase. Oxidation of the latter compounds was accompanied by partial dehalogenation. However, the activity of phenoloxidases was differently inhibited by the presence of clays and clay-humus complexes. Also pH and temperature exerted different effects on the phenoloxidases.

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