Design and Synthesis of a Fluorescent Probe Based on Copper Complex for Selective Detection of Hydrogen Sulfide

Figure 4

Blue: fluorescence response of probe NA-LCX-Cu²⁺ (20 μM) toward 10 equiv. of various amino acids (NA-LCX+Cu²⁺, Na₂S, NAC, GSH, Hcy, Cys, Asn, Glu, Phe, Pro, Gln, Arg, Trp, Asp, Tyr, Ile, Thr, His, Gly, Met, Leu, Ala, Val, Ser, and Lys) and other reactive sulfur species (Na₂S₂O₃, Na₂SO₄, and NaHSO₃). Orange: fluorescence response of probe NA-LCX-Cu²⁺ after addition of 10 equiv. of Na₂S in each of the above solutions.