A FRET-based ratiometric two-photon fluorescent probe for superoxide anion detection and imaging in living cells and tissues

The superoxide anion (O-2(-)) plays a crucial role in several physiological processes and many human diseases. Developing new methods for O-2(-) detection in biological systems is very important. A FRET-based two-photon (TP) fluorescent probe with a ratiometric signal, TFR-O, was developed. A naphthalene derivative based TP fluorescent group was selected as the energy donor group, and a rhodol fluorescent group was chosen as the energy acceptor; the trifluoromethanesulfonate group was chosen as the recognition moiety. After reacting with O-2(-), the recognition moiety was removed and the fluorophore was released, leading to a fluorescence intensity decrease at the wavelength of 425 nm and a significant enhancement of the fluorescence intensity at 550 nm. The fluorescence intensity ratio between 550 and 425 nm (I-550/I-425) varied from 0.15 to 6.72, with the O-2(-) concentration increasing from 0 to 50 M. The detection limit of the TFR-O was 83 nM. Moreover, TFR-O was applied for detecting and imaging O-2(-) in cells and liver tissues.