title: Development of a new delivery system consisting in 'drug-in cyclodextrin-in PLGA nanoparticles'.
abstract: A combined approach based on drug cyclodextrin (CD) complexation and loading into PLGA nanoparticles (NP) has been developed to improve oxaprozin therapeutic efficiency. This strategy exploits the solubilizing and stabilizing properties of CDs and the prolonged-release and targeting properties of PLGA NPs. Drug-loaded NPs, prepared by double-emulsion, were examined for dimensions, zeta-potential and entrapment efficiency. Solid-state studies demonstrated the absence of drug-polymer interactions and assessed the amorphous state of the drug-CD complex loaded into NPs. Drug release rate from NPs was strongly influenced by the presence and kind of CD used. The percentage released at 24 h varied from 16% (plain drug-loaded NPs) to 50% (drug-betaCD-loaded NPs) up to 100% (drug-methylbetaCD-loaded NPs). This result suggests the possibility of using CD complexation not only to promote, but also to regulate drug release rate from NPs, by selecting the proper type of CD or CD combination.
authors.affiliation: University of Florence, Faculty of Pharmacy, Department of Pharmaceutical Sciences, Florence, Italy. paola.mura@unifi.it
authors.forename: Paola
authors.initials: P
authors.lastname: Mura
authors.forename: Francesca
authors.initials: F
authors.lastname: Maestrelli
authors.forename: Matteo
authors.initials: M
authors.lastname: Cecchi
authors.forename: Marco
authors.initials: M
authors.lastname: Bragagni
authors.forename: Antonio
authors.initials: A
authors.lastname: Almeida
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage*; D003505:Cyclodextrins / Q000737:chemistry*; D004337:Drug Carriers / Q000737:chemistry*; D019344:Lactic Acid / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D000077431:Oxaprozin; D010316:Particle Size; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011422:Propionates / Q000008:administration & dosage*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D003505:Cyclodextrins; D004337:Drug Carriers; D011422:Propionates; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D000077431:Oxaprozin