Characterization of PEG-Bu/pDNA complexes.

<p>A: Agarose gel electrophoresis of PEG-Bu/pDNA complexes at various w/w ratios. 1: Marker; 2: naked pDNA; 3–10: polymer/pDNA complexes at w/w ratios of 0.1,0.3,0.5,1,3,5,10,20. B: Particle size and zeta potential of PEG-Bu/pDNA complexes at various w/w ratios. C: Representative atomic force microscopic (AFM) image of PEG-Bu/pDNA complexes at a w/w ratio of 5.