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. Author manuscript; available in PMC: 2022 Feb 24.
Published in final edited form as: ACS Appl Mater Interfaces. 2021 Feb 12;13(7):7913–7923. doi: 10.1021/acsami.0c19955

Figure 2.

Figure 2.

aAPC characterization and functional assessment. A) Chemical structure of PBAE synthesized via Michael addition of 1,4-butanediol diacrylate and 4,4-trimethylenedipiperidine and endcapped with 1-(3-aminopropyl)-4-methylpiperazine. SEM micrographs of B) PLGA and C) PLGA/PBAE microparticles. D) Particle size distribution of PLGA and PLGA/PBAE microparticles as evaluated by image analysis of SEM micrographs. E) Mean diameter of PLGA and PLGA/PBAE microparticles. Error bars represent SEM of 100 particles. F) PLGA and PLGA/PBAE have similar zeta potentials at pH 7.4. G) At pH 6.0, PLGA/PBAE particles exhibit a positive shift in zeta potential. Error bars in F) and G) represent SEM of 3 replicates.