作者:Jin-Chul Kim、Jong-Duk Kim
DOI:10.1007/s11746-002-0633-0
日期:2002.12
AbstractSurface‐modified vesicles were prepared using N‐[3‐(dimethylamino)propyl]‐octadecanamide and stearic acid as bilayer‐forming lipids, and N‐methylol urea‐dodecylamine conjugated (MU‐DOA) as a surface modifier. The conjugation of MU to DOA was confirmed by FTIR spectra. MU‐DOA was incorporated into the vesicles by co‐homogenization of the lipids and MU‐DOA, and the incorporated MU‐DOA was then reacted with MU in aqueous bulk phase through a self‐condensation reaction between the methylols under an acidic condition at 70°C. On a scanning electron microscope, the vesicles were spherical and multilamellar, and they exhibited thin polymer films on their surfaces. The incorporation of MU‐DOA into the bilayer and the surface coating of the vesicles did not significantly influence the transition temperature of the vesicles. The absolute values of zeta potentials of the surface‐modified vesicles were smaller than those of the unmodified vesicles, and the point of zero charge was shifted from ca. pH 9.5 to ca pH 6.5 by the surface modification.