ENHANCED CATALYTIC PROPERTIES OF MNP BY EXOGENOUS ADDITION OF MANGANESE AND HYDROGEN-PEROXIDE

The efficiency of the application of crude and purified MnP in process es such as degradation of hazardous compounds is greatly dependent of the Mn2+ and H2O2 concentrations. Mn2+ exerted a positive effect on th e reaction rate whereas excessively high H2O2 concentrations caused a partial inactivation of MnP, and as a result additional increases of M n2+ did not positively affect DMP oxidation rate. According to our res ults, concentrations around 5,000 mu M Mn2+ and 100 mu M H2O2 would ma ximize the catalytic MnP properties for the oxidation of 2,6-dimethoxy phenol. The presence of other cofactors in the crude enzyme such as or ganic acids stabilize formed Mn3+ and the oxidation rate was higher th an the corresponding to the purified one.