One of the most effective ways of targeted drug delivery is the intravenous injection of carriers. However, to prevent undesirable side effects it is necessary to develop microencapsulation drug delivery systems that satisfy following requirements: biocompatibility, non-cytotoxity, biodegradability, colloidal stability in different medium solutions. In case of polymeric microcapsules, aggregation is a crucial and challenging question for biomedical applications that has not been studied well yet. We investigated polymeric microcapsules behavior in PBS, human plasma, and human blood in time. Aggregation degree was measured after 1, 10, 30, and 60 minutes of incubation in a stationary state. As a result, dynamics of capsules aggregation was shown for each medium.
Microcapsules with and without magnetite nanoparticles incorporated in the polyelectrolyte shell were prepared. The effect of external electric field on the nanocomposite polyelectrolyte microcapsules containing magnetite nanoparticles in the shell was studied in this work as a function of the electric field strength. Effect of electric fields on polyelectrolyte microcapsules and the control over integrity of polyelectrolyte microcapsules with and without inorganic nanoparticles by constant electric field has been investigated. Beads effect, aggregation and deformations of nanocomposite microcapsule shell in response to electric field were observed by confocal laser scanning microscopy (CLSM). Thus, a new approach for effect on the nanocomposite microcapsule, including opening microcapsule shell by an electric field, was demonstrated. These results can be used for creation of new systems for drug delivery systems with controllable release by external electric field.
The formation of a monolayer and its structure depend on many factors. One of the least studied factors is the influence of the electric field. In this regard, the purpose of this study is to investigate the influence of the direction and magnitude of the electric field on the properties of monolayer, formed on the surface of water. The experiments have revealed: the electric field exerts a significant influence on the formation of monolayers, in particular, during liquid phase formation. The second part of the isotherm (corresponding liquid phase) were significantly stretched. We explain the liquid phase extension by the fact of the charge increasing (and change pH) of the surface region. To confirm this assumption also we made computer modelling of process monolayer formation.