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Pullulan-based nanoparticles as carriers for transmucosal protein delivery
Dionísio, Marita; Cordeiro, Clara; Remuñán-López, Carmen; Seijo, Begoña; Costa, Ana M. Rosa da; Grenha, AnaPolymeric nanoparticles have revealed very effective in transmucosal delivery of proteins. Polysaccharides are among the most used materials for the production of these carriers, owing to their structural flexibility and propensity to evidence biocompatibility and biodegradability. In parallel, there is a preference for the use of mild methods for their production, in order to prevent protein degradation, ensur...
Biocompatibility of chitosan carriers with application in drug delivery
Rodrigues, Susana; Dionísio, Marita; Remuñán-López, Carmen; Grenha, AnaChitosan is one of the most used polysaccharides in the design of drug delivery strategies for administration of either biomacromolecules or low molecular weight drugs. For these purposes, it is frequently used as matrix forming material in both nano and micron-sized particles. In addition to its interesting physicochemical and biopharmaceutical properties, which include high mucoadhesion and a great capacity t...
Chitosan and its derivatives as nanocarriers for siRNA delivery
Al-Qadi, Sonia; Grenha, Ana; Remuñán-López, CarmenThe ability to specifically silence genes using siRNA has enormous potential for treating genetic diseases. However, siRNA instability and biodistribution issues still need to be overcome, and adequate delivery vehicles have proven indispensable in conveying siRNA to its target. Chitosan is a promising biopolymer for siRNA delivery, its interest stemming from its safety, biodegradability, mucoadhesivity, permea...
Microspheres loaded with polysaccharide nanoparticles for pulmonary delivery: p...
Al-Qadi, Sonia; Grenha, Ana; Remuñán-López, CarmenIn this work, we report the preparation of a nanoparticle-based dry powder for pulmonary administration. Hybrid chitosan/hyaluronic acid nanoparticles were produced by ionotropic gelation and characterized for their physicochemical properties, being further studied by solid nuclear magnetic resonance (NMR). Using mannitol as carrier, nanoparticles were microencapsulated by spray drying, resulting in a dry powde...
The potential of chitosan for pulmonary drug delivery
Grenha, Ana; Al-Qadi, Sonia; Seijo, Begoña; Remuñán-López, CarmenThe administration of drugs through the pulmonary route offers great advantages, but also requires overcoming many challenges. There is a need to develop appropriate carriers for each active molecule to be delivered to the desired site in the lung, either for a local or a systemic effect. The polysaccharide chitosan is a very promising material for this purpose, given its demonstrated properties of biodegradabi...
Mucosal delivery of liposome-chitosan nanoparticles complexes
Carvalho, Edison Samir Mascarelhas; Grenha, Ana; Remuñán-López, Carmen; Alonso, Maria José; Seijo, BegoñaDesigning adequate drug carriers has long been a major challenge for those working in drug delivery. Since drug delivery strategies have evolved for mucosal delivery as the outstanding alternative to parenteral administration, many new drug delivery systems have been developed which evidence promising properties to address specific issues. Colloidal carriers, such as nanoparticles and liposomes, have been refer...
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