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Magnetite-PLGA Microparticles for Oral Delivery of Insulin
Published online by Cambridge University Press: 01 February 2011
Magnetic responsive particles were designed for use in oral delivery of insulin. Magnetite nanoparticles (12 nm average size) were synthesized and co-encapsulated with insulin into poly(lactide-co-glycolide) (PLGA) microparticles (4.6 ± 2.2 μm average particle size) through the double-emulsion method. The spherical structures of resulting microparticles were well maintained at magnetite content 5 wt % or less. Mice were gavaged with 125I-insulin-magnetitePLGA microparticles and a circumferential trans-abdominal magnetic field was applied forty minutes after administration to retard the transit of the microparticles in the intestinal tract. As control, mice were similarly dosed without the subsequent trans-abdominal magnetic field. Mice were sacrificed, and the intestinal radioactivity was 101% and 145% higher in treated mice versus the control at 6 h and 12 h, respectively. A single administration of 50 unit/kg Humulin Rmagnetite-PLGA microparticles to the fasted mice resulted in 66% reduction of blood glucose level in the presence of external magnetic field at 12 h, compared to 27% reduction in the absence of magnetic field.
- Research Article
- MRS Online Proceedings Library (OPL) , Volume 873: Symposium K – Biological and Bio-Inspired Materials and Devices , 2005 , K5.8
- Copyright © Materials Research Society 2005