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The effect of solvent on the catalytic properties of microperoxidase-11
Niall J O'Reilly1, Edmond Magner
1Materials and Surface Science Institute, Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland. noreilly@wit.ie
Abstract:
The effect of a range of solvents on the catalytic oxidation of methyl phenyl sulfide to methyl phenyl sulfoxide by MP-11 and by a cyclodextrin derivative of MP-11 was examined. The addition of low concentrations of alcohols enhanced the initial rate of sulfoxidation, most likely due to dispersion of MP-11 aggregates. Higher alcohol concentrations resulted in a decrease in activity arising from solvation of the hydrophobic sulfide, disrupting binding to the catalyst. In alcohols, the yield of product was decreased due to increased rates of MP-11 deactivation via the formation of aldehydes (for primary alcohols) or by peroxide-based deactivation. The catalytic activity of the cyclodextrin modified MP-11 was similar to that of MP-11 itself, demonstrating that it is the N-terminal side of MP-11 which is the determinant of catalytic activity.
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