Nanostructured drug delivery systems (NDDS), such as liposomes, represent a growing area in biomedical research. These microheterogeneous media can be used in many biological systems to provide appropriate drug levels with a specific biodistribution. The photophysical properties of a silicon derivative of tribenzonaphthoporphyrazinato (Si-tri-PcNc) incorporated into liposome were studied by steady-state techniques, time-resolved fluorescence and laser flash photolysis.
All the spectroscopy measurements performed allowed us to conclude that Si-tri-PcNc in liposome is a promising NDDS for PDT. The in vitro experiments with liposomal NDDS showed that the system is not cytotoxic in darkness, but exhibits a substantial phototoxicity at 1 μM of photosensitizer concentration and 10.0 J/cm2 of light. These conditions are sufficient to kill about 80% of the cells.
Simioni, A.R., Pelisson, M.M., Beltrame Jr, M. and Tedesco, A.C., 2008. Photophysical and photobiological studies of a silicon tribenzonaphthoporphyrazinato incorporated into liposomes for photodynamic therapy use. Journal of nanoscience and nanotechnology, 8(6), pp.3208-3215.
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Categories: Medical & Pharmaceutical