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Schematic illustration of the structures of PEI, PEI-SAH, PEI-Ac, PEI-PEG-Ac, and PEI-Ac50.
Note: x, y, m, and n represent the number of R1 or R2 groups in different PEI derivatives, respectively.
Abbreviations: PEI, polyethyleneimine; PEI-SAH, negatively charged carboxyl-terminated PEI (SAH denotes succinamic acid groups); PEI-Ac, completely acetylated PEI; PEI-PEG-Ac, neutralized PEI modified with both polyethylene glycol and acetyl groups; PEI-Ac50, partially (50%) acetylated PEI.
