Elsevier, Materials Science and Engineering: A, 1-2(442), p. 375-378
DOI: 10.1016/j.msea.2006.02.225
Full text: Unavailable
We present the results of anelastic spectroscopy on the dynamic properties of lipid complexes widely used as DNA vectors in gene therapy. In particular we studied the cationic/neutral lipid mixtures DOTAP/DOPE, DOTAP/DMPC and the single lipids, DOTAP (di-oleoyl trimethylammonium propane), DOPE (di-oleoyl phosphatidylethanolamine), DMPC (dimyristoyl phosphatidylcholine) and DDAB (dimethyldioctadecylammonium), deposited on a solid silicon(1 0 0) substrate. Two relaxation processes have been observed at about 200 and 140 K in mixtures of cationic and neutral lipids, which are due to a dynamics in the membrane plane on time scales accessible to anelastic spectroscopy. The presence of the two processes appears to be a general phenomenon independent of the lipid type, and is connected to the motion of lipids and lipid domains in the membrane plane.