Research Article

A Turn-On Fluorescent Probe for Sensitive Detection of Cysteine in a Fully Aqueous Environment and in Living Cells

Figure 3

Fluorescence spectra of probe 1 (10 μM) in the presence of Cys with various concentrations: 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 20.0, 30.0, 40.0, 50.0, and 100.0 μM (from a to y). Inset shows the standard curve. λex = 347 nm.