Preparation of siRNA-Encapsulated PLGA Nanoparticles for Sustained Release of siRNA and Evaluation of Encapsulation Efficiency

Nanoparticles (NPs) formulated using poly (d,l -lactide-co -glycolide) (PLGA), a biodegradable, biocompatible, and clinically approved polymer, have been widely used for targeted drug delivery. Here we provide methods for preparing PLGA NPs that encapsulate small interfering RNA (siRNA). The siRNA NPs are formulated using a double-emulsion solvent evaporation technique with the addition of a small amount of the cationic polymer, polyethyleneimine, which significantly increases siRNA encapsulation.