Figure
2. (A) Fluorescence responses of FL-ST (10 μM) to BSA (5
mg/mL) and FL-DT (10 μM) to solutions of BSA (5 mg/mL), rBSA
and the sulfhydryl reducing agent TCEP (12.5 mM). λex =
490 nm, Slit: 5 nm/3 nm. (B) SDS-PAGE analysis of the specific labeling
of dithiol groups in proteins by FL-DT .