title: Freeze-drying of composite core-shell nanoparticles.
abstract: The effects of four sugars (glucose, saccharose, maltose, trehalose) and one surfactant (Poloxamer 188), on the freeze-drying of poly(isobutylcyanoacrylate) (PIBCA), poly(epsilon-caprolactone)-poly(ethylene glycol) (PCL-PEG), and novel core (mainly PIBCA)-shell (principally PEG) composite nanoparticles (CNP) obtained by co-precipitation were investigated. The efficiency of the additives against the adverse effect of freeze-drying on the redispersibility of the nanoparticles was evaluated, based on the visual appearance of the nanoparticle suspensions (Tyndall effect and aggregation), and on the determination of the mean diameter ratio of the nanoparticles before and after freeze-drying. The results indicated that the addition of both sugars and surfactant was essential for the good redispersion of freeze-dried nanoparticles displaying hydrophobic (PIBCA) or hydrophilic (PCL-PEG and CNP) surfaces.
authors.affiliation: UMR 8612, Faculty of Pharmacy, University of Paris-Sud XI, France.
authors.forename: A-M
authors.initials: AM
authors.lastname: Layre
authors.forename: P
authors.initials: P
authors.lastname: Couvreur
authors.forename: J
authors.initials: J
authors.lastname: Richard
authors.forename: D
authors.initials: D
authors.lastname: Requier
authors.forename: N
authors.initials: N
authors.lastname: Eddine Ghermani
authors.forename: R
authors.initials: R
authors.lastname: Gref
mesh_terms: D003487:Cyanoacrylates / Q000737:chemistry; D004339:Drug Compounding / Q000379:methods*; D004355:Drug Stability; D004659:Enbucrilate; D005027:Ethylene Oxide / Q000737:chemistry; D005612:Freeze Drying; D005947:Glucose / Q000737:chemistry; D007783:Lactones / Q000737:chemistry; D008320:Maltose / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D010316:Particle Size; D020442:Poloxamer / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D013395:Sucrose / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D013535:Suspensions; D014199:Trehalose / Q000737:chemistry
chemical_list: D003487:Cyanoacrylates; D007783:Lactones; C400421:PLC(20)-b-PEO(44); D011108:Polymers; D013501:Surface-Active Agents; D013535:Suspensions; D020442:Poloxamer; D013395:Sucrose; D008320:Maltose; D014199:Trehalose; D004659:Enbucrilate; D005947:Glucose; D005027:Ethylene Oxide