Development And Evaluation Of Rivastigmine Loaded Chitosan Nanoparticles For Brain Targeting.
M. Fazil, Shadab Md, S. Haque, M. Nireekshan Kumar, S. Baboota, J. Sahni, J. Ali
Published 2012 · Chemistry, Medicine
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The rivastigmine (RHT) loaded chitosan nanoparticles (CS-RHT NPs) were prepared by ionic gelation method to improve the bioavailability and enhance the uptake of RHT to the brain via intranasal (i.n.) delivery. CS-RHT NPs were characterized for particles size, particle size distribution (PDI), encapsulation efficiency, zeta potential and in vitro release study. Nose-to-brain delivery of placebo nanoparticles (CS-NPs) was investigated by confocal laser scanning microscopy technique using rhodamine-123 as a marker. The brain/blood ratio of RHT for different formulations were 0.235, 0.790 and 1.712 of RHT (i.v.), RHT (i.n.), and CS-RHT NPs (i.n.) respectively at 30 min are indicative of direct nose to brain transport bypassing the BBB. The brain concentration achieved from i.n. administration of CS-NPs (966 ± 20.66 ng ml(-1); t(max) 60 min) was significantly higher than those achieved after i.v. administration of RHT sol (387 ± 29.51 ngml(-1); t(max) 30 min), and i.n. administration of RHT solution (508.66 ± 22.50 ng ml(-1); t(max) 60 min). The higher drug transport efficiency (355 ± 13.52%) and direct transport percentage (71.80 ± 6.71%) were found with CS-RHT NPs as compared to other formulation. These results suggest that CS-RHT NPs have better brain targeting efficiency and are a promising approach for i.n. delivery of RHT for the treatment and prevention of Alzheimer's disease (AD).
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