Síntese de nanoparticulas de sílicas carregadas positivamente e estudo de adsorção de fármacos aniônicos

Abstract

For this work silica-based mesoporous nanomaterials were synthesized to be used in transportation and controlled released of drugs. It is divided in three stages, where the first concerns the study (I) of two different synthetic routes in literature and the development of a third one, and the subsequent choice of the most advantageous. (II) The study of different functionalizations with silylating agent 3-aminopropyltrethoxysilane (APTES), through graft and the reaction medium, and through co-condensation (II). Modification of the amino group obtained from the APTES, through a process of quatenization in order to produce a material with a positive surface charge that doesn't depend on the medium. The second part consists of the study of the adsorption of the material functionalized with primary and quaternary amine through the adsorption isotherms and kinetics. The third part concerns the studies of the release in aqueous and biologic media, as well as indications of possible usages of the material obtained. In this work were produced nanometric materials in size between 65 nm and 120 nm with positive superficial charge of + 22.1 mV and 25 mV. The material revealed high adsorption of the drug used in this study, which was composed of 700 mg g-1 for primary amine and 800 mg g -1 for quaternary amine. The release tests indicate that the material is active, with release of the active ingredient of the chosen drug, sodium nitroprusside.