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The aim of the study was to prepare lansoprazole (LNS)-loaded poly( d,l -lactide- co -glycolide) (PLGA) nanoparticles in order to improve the physicochemical stability associated with LNS. We synthesized LNS-loaded PLGA nanoparticles in the presence of magnesium oxide as alkalizer to improve the release of LNS and stability against photodegradation. The LNS-encapsulated PLGA nanoparticles were developed by the nanoprecipitation/solvent evaporation method, resulting in a particle size of 246.7 ± 3.4 nm, polydispersity index (PDI) of 0.126, percent drug entrapment (PDE) of 82.85 ± 4.5%, percent drug loading (PDL) of 3.54 ± 0.34%, and pH of 8.10 ± 0.56. The developed nanoparticles were further evaluated for  in vitro  release and resistance to photodegradation by NMR spectroscopy and LC-MS. The sustained release of the drug was confirmed after the encapsulation of LNS in the PLGA matrix. The protection of LNS in the PLGA matrix against photodegradation was confirmed by NMR and LC-MS studies. The LC-MS of UV-exposed samples of pure LNS and LNS-loaded PLGA nanoparticles at 254 nm showed the same (M + 1) peak at 370  m/e , and the base peak at 369  m/e  accounted for the unchanged structure of LNS inside PLGA nanoparticles. Overall, it was proved that PLGA nanoparticles in the presence of magnesium oxide are an efficient carrier to deliver and protect LNS from physicochemical instability.

Preparation and evaluation of a stable and sustained release of lansoprazole-loaded poly( d , l -lactide- co -glycolide) polymeric nanoparticles