Figure 2: A) Illustration of custom-built oxygen sensing
measurement setup with CCD camera, excitation light, selective filter,
and flow chamber. B) Fluorescence emission spectra at different oxygen
(0% and 100%) concentrations excited at 455nm measured by CCD camera
equipped with a telecentric lens. C) Relative fluorescent intensity of
Stern-Volmer equation over time obtained by dividing values of
unquenched and quenched fluorescence intensities (I0/I)
representing the oxygen concentration in the chamber. D) MPs oxygen
release kinetics containing following saturation with 100% oxygen. The
intensity of each condition was obtained by averaging the intensity over
the channel.