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. 2020 Aug 18;8:982. doi: 10.3389/fbioe.2020.00982

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Copyright © 2020 Muller, Berber, Lutzweiler, Ersen, Bahri, Lavalle, Ball, Vrana and Barthes.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(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 with 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.