Assembly and Properties of Phosphorous Dendrimer/DNA Multilayers and Microcapsulesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We report the preparation, characterization and mechanical properties of DNA/phosphorus dendrimer
multilayer microcapsules. The shells of these microcapsules are composed by alternating DNA and positively
charged dendrimer Gn(NH+Et2Cl-)m (n ) 1, 2, 3, 4; m ) 12, 24, 48, 96). The same multilayers were constructed
on planar support to examine their layer-by-layer growth and to determine the multilayer thickness. Surface
plasmon resonance spectroscopy (SPR) showed regular linear growth of the multilayer film after the first dendrimer
layer. We probe the mechanical properties of these DNA/dendrimer microcapsules by measuring force-deformation
curves with the atomic force microscope (AFM). The experiment suggests that they are softer than microcapsules
assembled from linear flexible polyelectrolytes (PE) studied before. The stiffness of the capsules increases with
the generation of used dendrimer. This reflects the change in the multilayer thickness, but not the changes in
structure of surface DNA/dendrimer complexes, which almost likely remains similar for all dendrimer generations.