Abstract
The photostability and phototoxic influence on DNA of several styryl dyes are investigated by studying the absorption, fluorescence and phosphorescence spectra of these dyes and DNA + dye systems. The dyes Bos-1, DBos-24, and DBos-30 exhibit a rather intensive fluorescence under the two-photon excitation. Changes of the optical density in the wavelength regions 250 ÷ 300 nm (DNA absorption) and 370 ÷ 650 nm (dye absorption) of DNA + dye solutions caused by the visible light irradiation are fixed. Bos-1 and DBos-30 dyes bound to DNA are more photostable than those in free state, being photochemically safe for DNA. DBos-24 and Dst-MdO dyes show a slight phototoxic effect on DNA.
Acknowledgments
This work was supported in part by the Science and Technology Center in Ukraine (STCU), Project #U3104k.