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Folate-decorated PLGA Nanoparticles As A Rationally Designed Vehicle For The Oral Delivery Of Insulin.

S. Jain, Vishal V. Rathi, A. Jain, Manasmita Das, Chandraiah Godugu
Published 2012 · Medicine, Materials Science

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AIMS The present study reports a novel approach for enhancing the oral absorption and hypoglycemic activity of insulin via encapsulation in folate-(FA) coupled polyethylene glycol (PEG)ylated polylactide-co-glycolide (PLGA) nanoparticles (NPs; FA-PEG-PLGA NPs). MATERIALS & METHODS Insulin-loaded FA-PEG-PLGA NPs (size ∼260 nm; insulin loading ∼6.5% [w/w]; encapsulation efficiency: 87.0 ± 1.92%) were prepared by double-emulsion solvent evaporation method. The bioavailability and hypoglycemic activity of orally administered FA-insulin NPs were studied in diabetic rats. RESULTS & CONCLUSION FA-PEG-PLGA NPs (50 U/kg) exhibited a twofold increase in the oral bioavailability (double hypoglycemia) without any hypoglycemic shock as compared to subcutaneously administered standard insulin solution. Insulin NPs maintained a continual blood glucose level for 24 h, which, however, was transient (<8 h) in the case of subcutaneous insulin and associated with severe hypoglycemic shock. Overall, we have developed a patient-compliant, oral nanoformulation of insulin, once-daily administration of which would be sufficient to control diabetes for at least 24 h.
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