instead of non-inhibition of amyloid β fibrils. The development of new curcumin analogue, Me-CUR (9), as fluorescent switchable probe to detect amyloid β fibrils is described. Me-CUR (9) shows excellent fluorescence, especially higher than ThT (4), in the presence of amyloid β fibrils. These results suggest that Me-CUR (9) can become a useful in vitro amyloidfluorescencesensor for diagnosis of Alzheimer’s
chain-propagating peroxyl radicals. Curcumin has a unique structure with phenolic hydroxyl group as well as β-diketonemoiety in the same molecule, both of which are able to donate electrons to free radicals. However, due to the reactivity toward molecular oxygen, the carbon-centered radical derived from β-diketonemoiety do not serve as radical-trapping antioxidants. In this study, we reasoned that stabilization