The reduction of the metal ions and the corresponding oxidation of the peptides diminishes their fluorescence (Figure ). The same occurs when the peptides were mixed with NaIO4, which is a strong oxidizing agent. The fluorescence was retrieved by reducing the peptides with NaBH4. On the other hand, the oxidation of the peptides did not seem to significantly harm their coacervation (Figure ). Mass-spectrometry was used to determine the oxidized form of the peptide and a peak that corresponds to a peptide oxidized at both its indole groups and both imidazole groups was obtained (Figures 7E and Figure ). Overall, these results indicate that the origin of the antioxidant capabilities of the peptides lie in their ability to oxidize their four functional groups. Such a property could be greatly beneficial as a delivery vehicle for dietary supplements as well as drugs and other compounds that can be easily oxidized. Along with their UV-protective capabilities, encapsulation capabilities, intrinsic fluorescence, and the ability to control their deposition, this coacervation system could provide valuable means for delivering various compounds.