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. Author manuscript; available in PMC: 2021 Oct 1.
Published in final edited form as: ACS Appl Bio Mater. 2020 Aug 4;3(9):6263–6272. doi: 10.1021/acsabm.0c00761

Figure 1. Synthesis and characterization of acetylated PEI (Ac-PEI).

Figure 1.

A) Synthesis scheme for acetylated PEI. B) Representative 1H-NMR spectra for PEI and Ac-PEI in D2O. The peak at 1.7–1.8 ppm is due to acetylated primary amines whereas the peak at 1.8–1.9 ppm is from acetylated secondary amines of PEI. C) Quantification of PEI degree of acetylation and molecular weight determined by 1H-NMR for various modified PEI polymers.