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Fluorescent properties of the probe. (A) The maximum absorption peak appeared at 440 nm and the maximum wavelength of fluorescence emission was at 537 nm. (B) Optimized concentration of PFAP used for screening. PFAP exhibited an ACQ effect, a high concentration of the probe leads to aggregation while a low concentration of PFAP results in low fluorescence intensity, thus an optimized concentration for the probe used in this study is 50 μM.
