Folate Functionalized PLGA Nanoparticles Loaded with Plasmid pVAX1-NH36: Mathematical Analysis of Release

• Main Authors: Cindy Alejandra Gutiérrez-Valenzuela, Patricia Guerrero-Germán, Armando Tejeda-Mansir, Reynaldo Esquivel, Roberto Guzmán-Z, Armando Lucero-Acuña
• Format: Article
• Language: English
• Published: MDPI AG 2016-11-01
• Series: Applied Sciences
• Subjects: drug delivery; pVAX1-NH36; mathematical analysis; copolymer synthesis; leishmaniasis; folate nanoparticles
• Online Access: http://www.mdpi.com/2076-3417/6/12/364

Plasmid DNA (pVAX1-NH36) was encapsulated in nanoparticles of poly-dl-lactic-co-glycolic (PLGA) functionalized with polyethylene glycol (PEG) and folic acid (PLGA-PEG-FA) without losing integrity. PLGA-PEG-FA nanoparticles loaded with pVAX1-NH36 (pDNA-NPs) were prepared by using a double emulsification-solvent evaporation technique. PLGA-PEG-FA synthesis was verified by FT-IR and spectrophotometry methods. pVAX1-NH36 was replicated in Escherichia coli (E. coli) cell cultures. Atomic force microscopy (AFM) analysis confirmed pDNA-NPs size with an average diameter of 177–229 nm, depending on pVAX1-NH36 loading and zeta potentials were below −24 mV for all preparations. In vitro release studies confirmed a multiphase release profile for the duration of more than 30-days. Plasmid release kinetics were analyzed with a release model that considered simultaneous contributions of initial burst and degradation-relaxation of nanoparticles. Fitting of release model against experimental data presented excellent correlation. This mathematical analysis presents a novel approach to describe and predict the release of plasmid DNA from biodegradable nanoparticles.