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. Author manuscript; available in PMC: 2016 Dec 28.

Published in final edited form as: J Control Release. 2015 Nov 10;220(0 0):447–455. doi: 10.1016/j.jconrel.2015.11.005

Cytotoxicity assay in A549 cells (A), HeLa cells (B), and H9C2 cells (C) at various concentrations of PEI derivatives by MTT assay. PEI 25 kDa (●), PEI 1.8 kDa (▲), PEI (-s-s-) 7.6 kDa (▼), PEI (-s-s-) 16 kDa (■), and PEI (-s-s-) 32 kDa (♦). Results are expressed as mean ± standard deviation (n=5).

Cytotoxicity assay in A549 cells (A), HeLa cells (B), and H9C2 cells (C) at various concentrations of PEI derivatives by MTT assay. PEI 25 kDa (●), PEI 1.8 kDa (▲), PEI (-s-s-) 7.6 kDa (▼), PEI (-s-s-) 16 kDa (■), and PEI (-s-s-) 32 kDa (♦). Results are expressed as mean ± standard deviation (n=5).