Abstract
Due to uniquely ordered nanoporous structure and high surface area as well as large pore volume, mesoporous materials have exhibited excellent performance in both controlled drug delivery with sustained release profiles and formulation of poorly aqueoussoluble drugs with enhanced bioavailability. Compared with other bulk excipients, mesoporous materials could achieve a higher loading of active ingredients and a tunable drug release profile, as the high surface density of surface hydroxyl groups offered versatility to be functionalized. With drug molecules stored in nano sized channels, the pore openings could be modified using functional polymers or nano-valves performing as stimuli-responsive release devices and the drug release could be triggered by environmental changes or other external effects. In particular, mesoporous silica nanoparticles (MSN) have attracted much attention for application in functional target drug delivery to the cancer cell. The smart nano-vehicles for drug delivery have showed obvious improvements in the therapeutic efficacy for tumor suppression as compared with conventional sustained release systems, although further progress is still needed for eventual clinical applications. Alternatively, unmodified mesoporous silica also exhibited feasible application for direct formulation of poorly water-soluble drugs to enhance dissolution rate, solubility and thus increase the bioavailability after administration. In summary, mesoporous materials offer great versatility that can be used both for on-demand oral and local drug delivery, and scientists are making great efforts to design and fabricate innovative drug delivery systems based on mesoporous drug carriers.
Keywords: Mesoporous materials, drug delivery, on-demand drug delivery, multifunctional drug carrier, formulation, poorly soluble drugs.
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