DEGRADATION OF PHENOLIC COMPOUNDS BY LACCASE
FROM GANODERMA LUCIDUM
S. AHAMED JOHN AND A. CHOLARAJAN
Abstract
Laccase activities were found after GLC analysis of culture liquid of mycelium extract
Ganoderma lucidum grown on malt extract medium with or without inducers. These laccase enzyme
(E.C.1.10.3.2 paradiphenol: oxygen oxidoreductase) catalysis the oxidation and polymerization of
aromatic compounds in the presence of molecular oxygen. Laccase activity in the malt extract medium
had on pH 3 -4 and was stable from pH 3- 10 during 24 hours at room temperature. This enzyme had
wide substrates specificity on hydroquinone, methoxy-substituted monophenols and aromatic amines.
The laccase activity was found only with compounds having a redox potential lower than 0.5 mV. The
highest activity was obtained with methoxy, methyl-substituted p-hydroquinone and aromatic
diamines. Some activity also occurred with the aliphatic compounds 3, 5 cyclohexadiene-1, 2 diol.
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