A novel fluorescent probe with a large Stokes shift for colorimetric and selective detection of cysteine in water, milk, cucumber, pear and tomato

A novel fluorescent probe for colorimetric and selective detection of cysteine was efficiently constructed through a simple and mild reaction conditions. Probe 2 displays a linear response to Cys concentrations (0–30 μM), low detection limit (0.89 μM), large Stoke shift (125 nm).