The n value was found to be less than 0.45 and suggested that drug release from nanoparticles GSK-3 activity followed Fickian diffusion controlled mechanism. The results of stability studies are shown in Table 4. The physical as well as chemical characteristics
of the formulation were not affected at both temperature 3–5 °C and 15–25 °C during 3 months storage. There were no significant changes in drug content and FTIR spectra. From the above results the developed nanoparticles are stable at various temperatures. From this study, concentration of didanosine (ng/ml) from polysorbate 80 coated, uncoated formulation was measured in various organs of Wistar rats and compared with free drug of didanosine in solution. Fig. 5 shows that the mean concentration (ng/ml) of ddi in blood, liver, spleen, kidneys, lungs, lymph nodes and brain from polysorbate
80 coated, uncoated and free drug solution after 1 h of i.v administration. In almost, higher concentration of ddi reached in macrophage rich organs from group which has received polysorbate 80 coated nanoparticles than group 2 (uncoated nanoparticles), group 1 (the free drug solution). The concentration of ddi in brain, spleen and lymph nodes from polysorbate PS341 80 coated nanoparticles was found in 12.38, 8.15, 9.51 fold in comparison with the free ddi solution after 1 h of intravenous injection due to opsonization of albumin nanoparticles. In this study BSA nanoparticles were used as a carrier for antiretroviral and can be concluded that it is possible to prepare by desolvation technique. In vitro studies were evaluated to confirm the Fickian diffusion controlled drug Org 27569 release mechanism. Based on biodistribution studies polysorbate 80 coated nanocarriers play a specific role to extend the half-life of therapeutically active drugs with reduced
dose related adverse effects and also able to deliver higher drug levels in HIV reservoir sites which can provide better viral suppression by terminating HIV reverse transcriptase. From the results, human serum albumin can be substituted by bovine serum albumin to prepare nanoparticles containing antiretroviral drugs in further experiments. All authors have none to declare. “
“Donepezil (Fig. 1) is a piperidine-based, reversible inhibitor of the enzyme acetylcholinesterase. Donepezil is indicated for symptomatic treatment of patients with mild, moderate and severe dementia of the Alzheimer’s type. Alzheimer’s disease is a neurodegenerative disorder characterized by progressive loss of memory followed by complete dementia. It accounts for 50% of dementia cases.1 A consistent pathological change in Alzheimer’s disease is the degeneration of cholinergic neuronal pathways that project from the basal forebrain to the cerebral cortex and hippocampus. The resulting hypofunction of the cholinergic systems is thought to account for some of the clinical manifestations of dementia.