Abstract
Vesicle populations having narrowly distributed size distribution are mixed with each other to investigate the extent and degree of mutual interaction. One basic question is whether these vesicular systems can be seen as a “kinetic trap” or whether they reequilibrate with each other to form a common energy minimum. To this aim, different size distributions of oleate and POPC vesicles (POPC stands for 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) were prepared by extrusion methods. Accordingly, three different systems were investigated: POPC/POPC vesicles; oleate/oleate vesicles; POPC/oleate vesicles. Dynamic light scattering technique was used to follow the possible size changes in aggregation after the mixing of the two vesicles populations. In agreement with the “kinetic trap” notion, no interaction was observed for the first two systems; i.e., the two populations of vesicles coexisted for several days without change of their original size distribution. In the case of the oleate/oleate system, addi...
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