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Figure captions Fig. 1. DPAdS voltammograms in cathodic scan of a) curcumin (5.00 x 10-6 M); b) as in a) + 2.00 x 10-5 M Cu(II) in solution after incubation for 10 min at CPE. Deposition at 0.30 V for 120 s. The measurement was carried out in 0.2 M acetate buffer solution, pH 5.0, a scan rate = 50 mV s-1, Estep = 5 mV, and Epulse = 25 mV. Fig. 2. DPAdS voltammograms in cathodic scan of a) curcumin (5.00 x 10-6 M); b) as in a) + 2.00 x 10-5M Cu(II) in solution after incubation for 10 min at HMDE. Deposition at -0.80 V for 60 s. The measurement was carried out in 0.05 M phosphate buffer solution, pH 8.5, a scan rate of 20 mV s-1, a frequency of 230 Hz, and peak amplitude of 10 mV. Fig. 3. The effect of incubation time on the oxidation peak of guanine residues between dsDNA (0.140 g L-1) and constant concentration of CC (5.00 x 10-6 M) and Cu(II) (2.00 x 10-5 M). Other conditions as described in the experimental part. Fig. 4. Differential pulse voltammogram of: a) dsDNA (140 mg L-1) immobilized on the CPE surface; b) as in a) + 5.00 x 10-6 M CC in solution after incubation for 5 min; c) as in a) + 2.00 x 10-5 M Cu(II) in solution after incubation for 5 min; d) as in b) + 2.00 x 10-5 M Cu(II) in solution. Other conditions as described in the experimental part. Fig. 5. Differential pulse voltammogram of: a) dsDNA (140 mg L-1) + 5.00 x 10-6M CC in solution; b)asina)+5.00x10-6 MCu(II);c)asina)1.00x10-5 MCu(II);d)asina)+2.00 x 10-5 M Cu (II). The incubation time was 5 min. Other conditions as described in the experimental part. 16PDF Image | Electroanalytical dsDNA and curcumin vs copper
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