200 μL hydrogel was heated to a transparent liquid and mixed with 2 μL Thioflavin T (ThT) solution (1 mmol). Then, the sample was cooled to room temperature to form hydrogels. The fluorescence of the sample was observed at 365 nm by a dark-box ultraviolet analyzer (JY02S, Beijing Junyi, China), and detected by a Cary Eclipse fluorescence spectrophotometer (Agilent, USA) with excitation/emission wavelengths at 450/485 nm.
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