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Int. J. Electrochem. Sci., Vol. 14, 2019 5377 e) f) Figure 1. Absorbance spectra recorded in an aqueous solution containing 33 M curcumin at different pH values and experimental conditions: a) pH = 3.576 ± 0.001 without control of the experimental conditions, b) pH = 3.576 ± 0.001 controlling the experimental conditions, c) pH = 7.025 ± 0.001 without control of the experimental conditions, d) pH = 7.025 ± 0.001 controlling the experimental conditions, e) pH = 10.526 ± 0.001 without control of the experimental conditions and f) pH = 10.526 ± 0.001 controlling the experimental conditions. The insets depict the variation of the absorbance recorded at 423 nm (a-d) or at 432 nm (e and f) as a function of time. Figure 2 shows the %CD variation as a function of time for the different pH and experimental conditions considered. a) b) Figure 2. Percent curcumin degradation (%CD) as a function of time in an aqueous solution containing 33 M curcumin at different pH values: (Χ) 3.576 ± 0.001, (●) 7.025 ± 0.001 and (♦) 10.526 ± 0.001, and different experimental conditions: a) without control of the experimental conditions and b) controlling the experimental conditions. From Figure 2a, recorded without controlling the experimental conditions and for pH acid or neutral, the degree of curcumin degradation increased abruptly with time. Note that at 7 minutes the %CD is greater by about 45 % in acid medium and by 30 % in neutral, however at basic pH it is only 2 % but controlling the experimental conditions, see Figure 2b, the degradation at 7 minutes is 16 % atPDF Image | Curcumin in Aqueous Media at Different pH
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