Souza et al. found that the combination effect of air and light was more detrimental than light alone while the absorption of curcumin in water had no apparent effect on curcumin photo-stability [79]. In another study, the order of photochemical stability of different curcuminoid complexes in air-sparged conditions in methanol was curcumin > demethoxycurcumin > bis demethoxycurcumin