Fig. 3. Fluorescence intensity ratio (I 500/I 625) responses of probe TR-H2S (2 μM) to representative species in PBS buffer (pH = 7.4, 2% DMSO, 1 mg mL–1 HSA). (1) Free, (2) tBuOOH (200 μM), (3) NO (200 μM), (4) and (5) H2O2 (200 μM), (6) KO2 (200 μM), (7) Lys (200 μM), (8) HOCl (100 μM), (9) NH3·H2O (200 μM), (10) ˙OH (hydroxyl radical) (200 μM), (11) NO2 – (200 μM), (12) NO3 – (200 μM), (13) Glu (200 μM), (14) N3 – (200 μM), (15) CN–(200 μM), (16) K+ (5 mM), (17) Na+ (5 mM), (18) Ca2+ (1 mM), (19) Zn2+ (1 mM), (20) Mg2+ (500 μM), (21) S2O3 2– (200 μM), (22) SCN– (100 μM), (22) SO4 2– (500 μM), (23) Cys (1 mM), (24) GSH (5 mM), (25) H2S (100 μM).
