Abstract
A bifunctional fluorescent probe, A-1, was designed and synthesized for the recognition of Cys and viscosity. In the high-viscosity system, the intramolecular rotation of A-1 is restricted, which activates its near-infrared fluorescence. Simultaneously, the probe specifically detects Cys using acrylate as the recognition site. It possesses advantages such as high sensitivity, low detection limit, large Stokes shift (140 nm), high selectivity, and anti-interference properties. In addition, the probe A-1 can target mitochondria before recognition, and aggregate in lipid droplets after reacting with Cys. Based on the above excellent properties, it has been used to monitor changes in Cys and viscosity levels in living cells. And for the first time, it has revealed fluctuations in Cys and viscosity levels in the apoptosis model induced by Cisplatin. This provides a powerful tool for an in-depth study of related disease mechanisms.
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