Photochemistry and Photophysics of Shinorine Dimethyl Ester

ORALLO, DALILA E.; FANGIO, MARÍA FLORENCIA; POBLET, MARTIN; CARIGNAN, MARIO O.; BERNAL, LUIS; CARRETO, JOSÉ I.; BERTOLOTTI, SONIA G.; CHURIO, MARÍA SANDRA

PHOTOCHEMISTRY AND PHOTOBIOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2018

0031-8655

The photostability and photophysical properties of the dimethyl ester of the mycosporine-like amino acid shinorine have been experimentally evaluated in aqueous solution andin the presence of direct micelles prepared with a cationic or an anionic detergent, respectively. In comparison with shinorine, the ester molecule increases the photostability, the fluorescence quantum yield and the fluorescence lifetime in water as well as in the micellar solutions. The effects are more pronounced in sodium dodecyl sulfate solutions andsuggest that the electrostatic attractions with the micellar interface contribute to limit the movement of the molecules and influence the relative rate of their deactivation channels.However, the predominance of the nonradiative decay is maintained together with the UV photoprotective ability of this atypical mycosporine species.