Figure 3.

UV-vis absorption spectroscopy in 15 min intervals (gradient) during red-light irradiation of M134 liposomes under: argon (a); and in air in presence of 10 mM l-Asc and GSH (b). Absorbance at 490 nm (c); and upconversion emission at 486 nm (d) as a function of time for the experiment under argon (blue squares) and in air in presence of antioxidants (red circles). As control, M34 liposomes were irradiated under the same conditions under argon (c) (black diamonds). Conditions: 2 mL sample with 1 mM DMPC, irradiated at 37 °C with 150 mW 630 nm light (1.2 W/cm²). Arrows indicate the evolution of the spectrum in time at the indicated wavelengths (400 and 500 nm).