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ELECTROCHEMICAL STUDY OF CURCUMIN on carbon Electrode

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ELECTROCHEMICAL STUDY OF CURCUMIN on carbon Electrode ( electrochemical-study-curcumin-carbon-electrode )

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114 Andreea Lungu et al. 0.60x10-4 0.50x10-4 0.40x10-4 0.30x10-4 0.20x10-4 0.10x10-4 0 -0.10x10-4 A B 0 0.250 0.500 0.750 E/V 1.000 1.250 Fig. 5 – The behaviour of 10-4 M curcumin in DMSO containing 0.1 M TBABF4 at GCE bare electrode (A) without activation, cyclic voltammogram in the range from 0.30 V to 0.90 V, and (B) with anodic activation at 1.8 V for 60 s, cyclic voltammogram in the range from 0.00 V to 1.00 V at a scan rate of 100 mV/s. +OH- -CH3OH + OMe - OMe OMe O-O.O OH O- .O O OMe -H -e . . O -e- . O O Scheme 1. 0.60x10-4 0.50x10-4 0.40x10-4 0.30x10-4 0.20x10-4 0.10x10-4 0 -0.10x10-4 0 0.250 0.500 0.750 E/V 1.000 1.250 A B Fig. 6 – Comparison between the cyclic voltammograms of curcumin (A) and bisdemethoxycurcumin (B) at an anodically activated GCE, (electrode potential 1.8 V for 60 s, accumulation electrode potential -0.25 V, kept for 60 s), 100 mV/s scan rate, different ranges of potential 0.0 V – 1.0 V (A) and 0.0 V – 0.75 V (B). i/A i/A

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