Fig. 6

a Fluorescent intensity at 502 nm of BCD (60 μM) at various pH values in DMF-Hepes buffer (8/2, v/v, pH = 7.4) medium in the absence and presence of Cys (1 mM), λex = 463 nm. b Fluorescent intensity at 479 nm of BCD (60 μM) at various pH values in DMF-Hepes buffer (8/2, v/v, pH = 7.4) medium in the absence and presence of Hcy (1 mM), λex = 396 nm. c Fluorescent intensity at 476 nm of BCD (60 μM) at various pH values in DMF-Hepes buffer (8/2, v/v, pH = 7.4) medium in the absence and presence of GSH (1 mM), λex = 365 nm