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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: Adv Drug Deliv Rev. 2011 Sep 6;64(2):200–216. doi: 10.1016/j.addr.2011.08.006

Fig. 4.

Fig. 4

(a) Structure of AuNPs conjugated to 2 kDa branched polyethylenimine (PEI2) (NP 8), and N-alkylated PEI2 (dodecyl-PEI2). (b) Conjugation of PEI2 on NPs increases the transfection efficiency. Addition of dodecyl-PEI2 along with NP8 synergistically increases the transfection efficiency. The numbers in the parentheses indicate the ratio of PEI nitrogen to DNA phosphate that describes the carrier to DNA ratio.