Nanoliposomal Ratiometric Fluorescent Probe toward ONOO- Flux.

Peroxynitrite (ONOO-), a powerful biological oxidant, is produced in the mitochondria and reacts with many biomolecular targets under various pathological conditions, leading to a range of disease states. In this work, we developed a nanoliposome-encapsulated ratiometrically fluorescent probe (NRF) based on a hemicyanine structure Cy-O obtained by facile synthesis. Upon reaction with ONOO-, the oxidation and hydrolysis of a π-conjugation system within the nanoliposome triggers a ratiometrically fluorescent response and a large-scale emission shift (238 nm), which provides a specific and sensitive means for the ONOO- detection. Moreover, we have performed DFT calculation at the 6-31+G(d,p) level using a suite of Gaussian 09 programs to obtain insights into the chemical structure optical properties of Cy-O. In addition, the practical applications of the nanoprobe to image exogenous and endogenous ONOO- were achieved further in live cells and animals triumphantly.

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