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Int. J. Electrochem. Sci., Vol. 14, 2019 5383 species is the curcumin fully protonated (H3Cur), whereas above a pH value of 10.946 ± 0.034 the fully deprotonated form predominates (Cur3−). Between these values, there exists a mix of the mono (HCur2−) and diprotonated (H2Cur−) species. a) H3Cur H2Cur - Cur3- b) HCur2- Figure 5. a) Curcumin molar fraction diagram in an aqueous medium using the pKa values reported in this work, see Table 2; b) the corresponding predominance zone diagram. 4. CONCLUSIONS It was determined that the stability of curcumin is greater as the pH value increases and not under conditions of acid pH as several authors have claimed [15-17]. The stability of curcumin in aqueous medium is improved in all cases when working solutions are protected from incident light, work carried out under a N2 (g) atmosphere (after bubbling with this gas for 5 minutes) and controlled temperature. A good fit was found between the experimental and theoretical spectrophotometric data pHPDF Image | Curcumin in Aqueous Media at Different pH
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