Figure 1. A) Picture showing the stability after 2 months at 4°C of the different PDA-PAR₃₀ NPs formulations using different concentrations of dopamine hydrochloride (0.5, 0.3 and 0.2 mg.mL^-1) with a defined concentration of polyarginine (PAR) of 1 mg.mL^-1. B). Typical image of PDA-PAR₃₀ 0.2 NPs obtained Transmission Electron Microscope (TEM) and the subsequent size quantification results. C) Results of zeta potential measurements performed on PDA-PAR₃₀ 0.2 NPs as compared to pure PDA particles.