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Nanosilver Could Usher in Next-Generation Photoprotective Agents for Magnesium Porphyrins




A novel strategy, based on silver nanoparticles (AgNPs), has been developed for simultaneously improving: 1) photostability, 2) fluorescence emission, and 3) singlet oxygen generation ability of natural porphyrin (i.e., chlorophyll (Chl) molecules). The benefit of AgNPs as photoprotector of Chl is that they spontaneously bind with the nitrogen atoms of Chl as soon as they are mixed together, even in the dark prior to the illumination, inhibiting thus the binding of reactive oxygen species (ROS) at nitrogen sites, known to cause the photodegradation of porphyrins.