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Int. J. Electrochem. Sci., Vol. 14, 2019 5376 3. RESULTS AND DISCUSSION 3.1 Curcumin stability in aqueous solution at different pH values 3.1.1 Spectrophotometric measurements Figure 1 shows families of absorption spectra recorded from curcumin solutions at various pH and experimental conditions set as well. Note that at acid pH, see Figures 1a and 1b, the absorbance diminished drastically as a function of time regardless of the control on the experimental conditions, see insets in Figures 1a and 1b. At a pH close to neutral, Figures 1c and 1d, the absorbance variation also dependent on time, see inset in Figure 1c, is indeed similar to what was observed at acid pH, under uncontrolled experimental conditions. However, when controlling these, see Figure 1d inset, the absorbance variation as a function of time does not change drastically at all. This same can be observed for basic pH independently of the experimental control imposed, see insets in Figures 1e and 1f. Based on the absorbance temporal variation, a curcumin degradation percent (%CD) can be defined as follows: %CD =100 (A0-At/ A0) (1) where A0 is the initial absorbance and At is the absorbance at time t. a) b) c) d)PDF Image | Curcumin in Aqueous Media at Different pH
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