A cationic perylene tetracarboxylic acid diimide derivative (1) is employed as a probe for in situ monitoring of Aβ aggregation and screening Aβ inhibitors. The assay is based on the fluorescence change through the aggregation of compound 1 following Aβ assembly. Importantly, this probe, compared with the well known amyloid-staining compound thioflavin T (ThT), is more sensitive to Aβ oligomer, which is highly toxic and plays a crucial role in the early stages of Alzheimer's disease.
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