A homologous series of lipophilic polyamines was synthesized and evaluated for DNA delivery and transfection efficiency. The series contained 1, 4-butanediamine, 1, 8- octanediamine, 2-[2-(2-amino-ethoxy)-ethoxy]-ethylamine, homospermidine, and homospermine covalently attached via their N 1 terminus to a 3, 4-bis (oleyloxy)-benzyl motif. In addition, homospermidine and homospermine were also attached via amide ...