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Plant and Cell Physiology, 1965, Vol. 6, No. 4 645-651
© 1965

Article

EFFECT OF TEMPERATURE AND MOISTURE ON THE INACTIVATION OF O-DIPHENOL OXIDASE1

EDWARD C. SISLER and WILLIAM H. JOHNSON

Departments of Biochemistry and Agricultural Engineering, North Carolina State University Raleigh, North Carolina, U.S.A.

The influence of heat and moisture on the inactivation of o-diphenol oxidase has been studied. In vitro studies indicate that the enzyme's stability increases with a decrease in pH over the interval of pH 7.5–5.5. In situ studies indicate a marked influence of the moisture present on the stability of the enzyme over the moisture range of 66%–5%. The enzyme was more stable at lower moisture levels. When the time required for 50% inactivation was plotted versus the logarithm of the moisture content, a straight line was obtained.

1 Contribution from the North Carolina Experiment Station and published with the approval of the Director as paper no. 1992 of the Journal Series.

(Received May 18, 1965; )
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