Abstract
The oxidation of methanol and formaldehyde was investigated by using some combination systems of alcohol oxidase, catalase, which were purified from Candida N-16, and hydrogen peroxide. The activity of alcohol oxidase was irreversibly inhibited when the enzyme was incubated with 2.5 mm hydrogen peroxide for 15 min. However, the oxidation of methanol to formaldehyde by alcohol oxidase in the presence of catalase was extremely promoted by the addition of 30 mm hydrogen peroxide. Alcohol oxidase could oxidize not only methanol but also formaldehyde as follows: HCHO + 02 + H2O→HCOOH + H2O2. The formaldehyde oxidizing activity was inhibited by hydrogen peroxide. The system containing alcohol oxidase and catalase appears to be the entity of the oxygen-dependent oxidation system of formaldehyde previously found in the cell-free extract of the yeast.
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