title: Core-shell magnetite nanoparticles surface encapsulated with smart stimuli-responsive polymer: synthesis, characterization, and LCST of viable drug-targeting delivery system.
abstract: We describe here the synthesis of a novel magnetic drug-targeting carrier characterized by a core-shell structure. The core-shell carrier combines the advantages of a magnetic core and the stimuli-responsive property of the thermosensitive biodegradable polymer shell (e.g., an on-off mechanism responsive to external temperature change). The composite nanoparticles are approximately 8 nm in diameter with approximately 3 nm shell. The lower critical solution temperature (LCST) is approximately 38 degrees C as determined by UV-vis absorption spectroscopy. The carrier is composed of cross-linked dextran grafted with a poly(N-isopropylacrylamide-co-N,N-dimethylacrylamide) [dextran-g-poly(NIPAAm-co-DMAAm)] shell and superparamagnetic Fe3O4 core. Fourier transform infrared spectroscopy (FTIR) confirmed the composition of the carrier. The synthesized magnetic carrier system has potential applications in magnetic drug-targeting delivery and magnetic resonance imaging.
authors.affiliation: Center for Structural and Functional Materials and Department of Chemical Engineering, University of Louisiana at Lafayette, Lafayette, Louisiana 70504, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Zhang
authors.forename: R S
authors.initials: RS
authors.lastname: Srivastava
authors.forename: R D K
authors.initials: RD
authors.lastname: Misra
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D016503:Drug Delivery Systems; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008854:Microscopy, Electron; D011108:Polymers / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D000178:Acrylamides; D011108:Polymers; D052203:Ferrosoferric Oxide