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Int. J. Electrochem. Sci., Vol. 14, 2019 5379 8 a) 6 4 2 0 -2 -4 -6 0 60 4 b) -1 -2 -3 0 60 0 0.3 0.5 0.7 0.9 -0.1 0.1 0.9 E (V) 5 c) 4 3 2 1 0 -1 -2 -0.11 0.09 0.29 0.49 0.69 0.89 Figure 3. Experimental CVs recorded in the system CPE / Curcumin 33 M at different pH values: a) 3.576 ± 0.001, b) 7.025 ± 0.001 and c) 10.526 ± 0.001 and two different times: 0 (experiment beginning) and 60 min. In all cases the potential scan started at −0.1 V in the positive direction at 100 mVs−1. The dashed lines correspond to the CVs recorded at each pH in the absence of curcumin (blanks). Manaia et al. [25], have proposed the electrochemical reactions, see Reac. (1), involved during curcumin oxidation, which are associated with the two anodic peaks observed in Figure 3 (a, b and c) for the CVs recorded at time 0 (experiment beginning). During curcumin electrochemical oxidation, at the first anodic peak, there occurs formation of the phenoxy radical, which undergoes hydrolysis at the ortho-position, and the two hydroxyl groups in the benzene ring of an orthoquinone moiety 3 2 1 0 60 0.3 0.5 0.7 E (V) I (μA) I (μA) I (μA) E (V)PDF Image | Curcumin in Aqueous Media at Different pH
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