The rational design of a highly sensitive and selective fluorogenic probe for detecting nitric oxide

Area of Science:

• Chemical Biology
• Analytical Chemistry
• Molecular Probes

Background:

• Nitric oxide (NO) is a crucial signaling molecule involved in various physiological and pathological processes.
• Accurate detection of NO is essential for understanding its biological roles.
• Existing NO detection methods often suffer from low sensitivity or lack specificity, being susceptible to interference from other reactive oxygen and nitrogen species.

Purpose of the Study:

• To develop a rationally designed small-molecule fluorogenic probe for sensitive and specific detection of nitric oxide (NO).
• To investigate a novel switching mechanism for NO sensing.
• To achieve detection of NO in the low nanomolar (nM) range.

Main Methods:

• Design and synthesis of a small-molecule probe incorporating a NO-responsive dihydropyridine pendant group attached to a fluorophore.
• Evaluation of the probe's sensitivity and specificity towards NO using fluorescence spectroscopy.
• Testing the probe's response to various interfering species, including other oxidative oxygen/nitrogen species.

Main Results:

• A novel fluorogenic probe based on a new switching mechanism for NO detection was successfully developed.
• The probe demonstrated very high sensitivity, enabling NO detection down to the low nM range.
• The probe exhibited high specificity for NO, showing minimal response to common interfering species.

Conclusions:

• The developed small-molecule fluorogenic probe offers a sensitive and specific method for NO detection.
• The new switching mechanism provides a robust platform for designing future NO sensors.
• This probe is a valuable tool for research requiring accurate NO quantification in complex biological systems.