Characterization of Trametes versicolor laccase for the transformation of aqueous phenol.
Laccase (oxygen oxidoreductase, EC 1.10.3.2) from Trametes versicolor was thoroughly characterized in terms of its catalytic stability and its effectiveness as a biocatalyst under various reaction conditions when using phenol as a model substrate. This enzyme demonstrated high or moderate degrees of stability at pHs from 5 to 8 at 25 degrees C and at temperatures from 10 to 30 degrees C at pH 6. Exponential decay expressions were successfully used to model laccase inactivation when incubated under various conditions of pH and temperature. Phenol transformation was optimum at pH 6, but significant transformation was observed over a pH range of 4-7, provided that sufficient laccase was present in the reacting solution. Partial inactivation of laccase was observed during the oxidation of phenol, even under conditions of optimal stability (pH 6 and 25 degrees C).
Kurniawati
Selvia
S
Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West. Montreal, Quebec, Canada H3A 2K6.
Nicell
James A
JA
D001487:Basidiomycota / Q000201:enzymology*; D019149:Bioreactors / Q000382:microbiology; D001711:Biotransformation; D002021:Buffers; D002384:Catalysis; D004795:Enzyme Stability; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D042845:Laccase / Q000032:analysis / Q000737:chemistry*; D010084:Oxidation-Reduction; D019800:Phenol / Q000737:chemistry* / Q000378:metabolism*; D013379:Substrate Specificity; D013696:Temperature; D014867:Water / Q000737:chemistry*
D002021:Buffers; D014867:Water; D019800:Phenol; D042845:Laccase