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Hydroxamate iron complex with phenoloxidase activity acting on lignin and chlorolignins
C Parra1, M F Santiago, J Rodriguez
1Biological Chemistry Laboratory, Universidade Estadual de Campinas, S.P., Brazil.
Biochemical and Biophysical Research Communications
|September 10, 1998
Abstract:
The properties of a siderophore model, acetohydroxamic acid (AHA), of desferral were studied. The pH, ionic strength, and AHA/Fe(III) ratios for o-dianisidine oxidation were optimized. Phenoloxidase activity of hydroxamates/Fe(III) acting on o-dianisidine at pH 7.0 and pH 3.0 was observed. Under these conditions, AHA was able to reduce Fe(III) to Fe(II) followed by ferrozine complexation. AHA/Fe(III) complex degraded lignin and chlorolignins from kraft effluent E1 65% and 85%, respectively, after 24 h.