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.