Nanoparticles composed of PLGA and hyperbranched poly (amine-ester) as a drug carrier

A new hyperbranched poly (amine-ester)-poly (lactide-co-glycolide) (HPAE-co-PLGA) copolymer was synthesized by ring-opening polymerization of D, L-lactide, glycolide and a fourth generation branched poly (amine-ester) (HPAE-OHs4) with Sn(Oct)(2) as catalyst. The chemical structures of copolymers were determined by FT-IR, H-1-NMR (C-13 NMR), TGA and their molecular weights were determined by gel permeation chromatography (GPC). Two methods, double emulsion (DE) and nanoprecipitation (NP), were employed to fabricate the polymeric nanoparticles. Isoniazid (INH) was loaded as a model antitubercular drug. Influence of the preparation conditions on the nanoparticles size, encapsulation efficiency and release profile in vitro was investigated. Their entrapment efficiency (EE) to INH could reach 96% at an available condition. In vitro release behavior of NPs showed a continuous release after a burst release. The results showed that the HPAE-co-PLGA copolymer nanoparticles have a promising potential in hydrophilic drug delivery system.