Fig. 3.

Fluorescence emission of 3 with Cys and Hcy in the presence and absence of amino acids (AAs: Gly, Ala, Met, Gln, Glu and Asp) and GSH after 2 h. Solutions are composed of 3 (4 μM) and each analyte (50 μM) in phosphate buffer (100 mM, pH 6.0):DMSO 99:1 at 20 °C, λex = 495 nm and λex 525 nm