Efficiency comparison of the imidazole plus RNO method for singlet oxygen detection in biorelevant solvents.

Singlet oxygen (O) is the focus of study in many fields, including phototoxicity, antioxidant activity, pollutant weathering, photodynamic therapy, and water disinfection. The imidazole plus RNO (Imd/RNO) method, originated by Kraljic and El Mohsni, is commonly used to monitor singlet oxygen production. In this method, O is quenched by an acceptor, imidazole (Imd), during the formation of a trans-annular peroxide intermediate that bleaches the sensor, p-nitrosodimethylaniline (RNO).

Emerging technologies for optical spectral detection of reactive oxygen species.

This review surveys recent advances in optical spectral detection of reactive oxygen species (ROS), particularly singlet oxygen, superoxide, hydroxyl radical, and hydrogen peroxide. Advances using nanoparticles and self-organizing nanostructures as well as optical detection schemes are included. Measurements using plasmonic, luminescent, photocatalytic, or self-organizing nanoparticles are highlighted.