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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: 2007 Nsti Nanotechnology Conference And Trade Show - Nsti Nanotech 2007, Technical Proceedings Título del capítulo: The effect of water on particle size, porosity and the rate of drug release from implanted titania reservoirs
Autores UNAM: PATRICIA QUINTANA OWEN;
Autores externos: Idioma: Año de publicación: 2007Palabras clave:
Controlled drug delivery; Hydrolysis; Hydroxylation; Implants (surgical); Particle size analysis; Porosity; Controlled drug releases; Epilepsy; Neurodegenerative illnesses; Valproic acid; Water analysis
Resumen:
A new strategy in the treatment of several neurodegenerative illnesses is the implantation of devices to be used in controlled drug release. Sol-gel titania implants filled with valproic acid, have being used for this purpose, to treat epilepsy induced in rats. The kinetics of drug release depends on: (a) porosity and (b) chemical interactions between valproic acid and the surface hydroxyl groups of titania. The concentration of water used in the hydrolysis reaction is an important variable in the degree of porosity, hydroxylation and structural defects of the nanostructured titanium oxide reservoir. The titanium n-butoxide/water ratio was systematically varied during the sol-sol-gel synthesis, while maintaining the amount of valproic acid constant. Characterization studies were performed using DTA-TGA, FTIR, Raman, TEM, SEM, BET and in vitro release kinetic measurements. The particle size and porosity were found to depend on the amount of water used in the sol-gel reaction.
