Encapsulation of nanoparticles with multifunctional, cross-linkable diblock copolymers for biomedicine

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We would like to present a micellular encapsulation method for nanoparticles (quantum dots, iron oxides, gold) which is based on a ligand exchange procedure of native ligands with a prepolymer poly(isoprene)-diethylentriamine (PI-N3) and subsequent ligand addition with poly(isoprene)-b-poly(ethylene glycol) diblock copolymer (PI-b-PEG). As previously reported ligand systems are usually based on self-organization by hydrophobic effects and/or coordinative bonds. Here, both effects were combined and expanded to include the cross-linkage of the poly(isoprene) moiety. This leads to unique stability in aqueous media with fluorescence quantum efficiencies up to 55% and ensures rigidity against biodegradation. PI-b-PEG diblock copolymer encapsulated NPs are non-toxic and were used for antibody-mediated imaging of tumors in vivo. The use of the diblock copolymer allows the functionalization at different stages: a) prior to the ligand addition by terminating the polymerization or after the polymerization (pre-assembly) and b) after the ligand addition (post-assembly).

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Journal: TechConnect Briefs
Volume: 3, Nanotechnology 2012: Bio Sensors, Instruments, Medical, Environment and Energy (Volume 3)
Published: June 18, 2012
Pages: 36 - 39
Industry sector: Medical & Biotech
Topics: Diagnostics & Bioimaging, Sensors - Chemical, Physical & Bio
ISBN: 978-1-4665-6276-9