Abstract
Curcumin, a natural ingredient present in turmeric rhizome is known for its various therapeutic activities such as antioxidant, anti-inflammatory, anticancer, antidiabetic, NF-kB activation suppresser. The hydrogenated derivative of curcumin, i.e., tetrahydrocurcumin, is also found to reveal the same activities. Moreover, the pro-oxidant effect of curcumin is reported, whereas tetrahydrocurcumin does not show any pro-oxidant effects. This contrasting behaviour of the two is attributed to their structures, because conjugation is involved only in curcumin, not in the tetrahydrocurcumin. It can be evidently concluded that double bonds affect the keto-enol ratio of the molecules and are therefore responsible for the degradation of curcumin, whereas tetrahydrocurcumin remains stable. Nevertheless, these double bonds are liable to affect the kinetics of beneficial activities of curcumin and tetrahydrocurcumin.
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