Photophysics, photochemistry and photobiology of curcumin : Studies from organic solutions, bio-mimetics and living cells

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Curcumin: Biological, Pharmaceutical, Nutraceutical, and Analytical Aspects (2019, background): “CUR degradation occurs upon exposure to sunlight [50,55] which is commonly observed by quick removal of turmeric stains when exposed to sunlight.”
The Chemistry of Curcumin: From Extraction to Therapeutic Agent (2014, background): “The diketo group exhibits keto-enol tautomerism, which can exist in different types of conformers depending on the environment [33].”
Turmeric and Its Major Compound Curcumin on Health: Bioactive Effects and Safety Profiles for Food, Pharmaceutical, Biotechnological and Medicinal Applications (2020, background): “Its color turns to red in the charged state (pH<1 or pH>7) (Goel et al., 2008) and sunlight exposure accelerates curcumin degradation (Priyadarsini, 2009).”