To quantify the interplay between protein-and lipid oxidation at the intra-droplet level, we first determined the average fluorescence intensity from BODIPY 581/591 C11. Next, we integrated the fluorescence by CAMPO-AFDye 647 and divided the value by the circumference (2πr) with the calculated radius r from the segmentation to obtain a measure for protein oxidation at the interface. This quantification revealed heterogeneity for lipid oxidation (Figure ), as discussed earlier (Figure &) and also for protein oxidation (Figure ). In polydisperse emulsions, both lipid and protein showed more oxidation for smaller droplets. This droplet size dependency is, however, more pronounced for lipid as for protein oxidation.