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Dependence of phenolic oxidation rate by potato anionic peroxidase on pH. The rate of oxidation of ferulic acid 3a (black symbols) and coniferyl alcohol 6a (white symbols) was measured spectrophotometrically in buffers of differing pH. The buffers used (all at 50 mm) were citrate (•), acetate (▪, □), His (▴, ▵), phosphate (▿), and Tris (⋄). Oxidation rates were measured in triplicate. Error bars represent ±1 sd.
