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Misako Kato, Seki Shimizu. Chlorophyll metabolism in higher plants. VII. Chlorophyll degradation in senescing tobacco leaves; phenolic-dependent peroxidative degradation. Canadian Journal of Botany, 1987, 65(4): 729-735, 10.1139/b87-097

Catalase activity was assayed by measuring the initial rate of disappearance of H202. Three millilitres of reaction mixture contained 0.1 M sodium phosphate buffer, pH 7.0, 2 mM H20,, and 0.1 mL enzyme extract.
The decrease in H,O, was followed as a decline in optical density at 240 nm and activity was calculated using the extinction coefficient (40.0 mM" cm-' at 240 nm) for H,O,
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