Sodium azide (0.05 wt. %) was added to the emulsions to prevent accidental growth of bacteria. For lipid-protein co-oxidation measurements, BODIPY 581/591 C11 was added to the emulsions prior to incubation, and CAMPO-AFDye 647 (see Figure for the chemical structure) was added after incubation, before the measurements. The concentrations of BODIPY 581/591 C11 and CAMPO-AFDye 647 in the emulsions were 1 µM.