Abstract
Receptor-mediated transcytosis of nanoparticles is paramount for the effective delivery of various drugs. Here, we report the design and synthesis of highly functional nanoparticles with specific targeting toward the folate receptor (FR) for the peroral delivery of insulin. In doing so, we demonstrate naringenin (NAR), a citrous flavonoid, as a targeting ligand to FR, with a similar affinity as folic acid. The NAR-decorated nanoparticles indicated a 4-fold increase in FR colocalization compared to unfunctionalized nanoparticles. The NAR-conjugated precision polyester allows for high insulin loading and entrapment efficiencies. As a result, insulin-laden NAR-functional nanoparticles offered a 3-fold higher bioavailability in comparison to unfunctionalized nanoparticles. This work generated a promising contribution to folate-receptor-mediated peroral delivery of insulin, utilizing polymeric nanoparticles decorated with a natural ligand, NAR.
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