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. Author manuscript; available in PMC: 2013 Oct 31.
Published in final edited form as: J Control Release. 2011 Dec 2;160(2):10.1016/j.jconrel.2011.11.030. doi: 10.1016/j.jconrel.2011.11.030

Fig. 1.

Fig. 1

Conjugating lipid tails to PEI via an epoxide ring opening reaction. (A) A schematic representation of the chemical reaction. Epoxide terminated alkane was dissolved in ethanol and reacted with PEI at 90 °C for 48 h to form lipid–PEI hybrids. (B) The molecular weight of alkane-modified polyethyleneimine as a function of lipid:PEI mole ratio was determined using matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-ToF MS).