Figure 1 . (A) Fluorescence enhancement multiple of responses of FL-DTto various amino acids. (B) Time-dependent fluorescence intensity ofFL-DT (10 μM) at 526 nm in the presence of 100 μM Cys. (C) Fluorescent titrations of FL-DT in response to the addition of Cys (0-100 μM). (D) Job’s plot of the reaction between FL-DTand Cys in HEPES buffer. (E) Specific names of a series of small peptides. (F) The ESI-MS spectrum of FL-DT reacted with 4C2C in HEPES buffer. (G) Relative fluorescence responses of FL-DT (10 μM) to 4C2C, 10CC, 10C2C, 15CC, 15C2C, 15C4C, 15C6C and 15C8C (100 μM) in HEPES buffer. λex = 490 nm, Slit: 5 nm/3 nm.