A new fluorogenic substrate 1, which enables the fast and quantitative analysis of alkaline phosphatase activity, has been developed. Selective enzymatic hydrolysis of 1 instantly generated fluorescent compound 2 in aqueous media, which undergo an excited-state intramolecular proton transfer process, resulting in a remarkable fluorescence turn-on signal with an unusually large Stokes shift.
- Alkaline phosphatase
- Excited-state intramolecular proton transfer
- Fluorogenic assay
- Inhibitor assay