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Rovers S.A.,TU Eindhoven | Hoogenboom R.,Dolphys Medical | Hoogenboom R.,Supramolecular Chemistry Group | Kemmere M.F.,TU Eindhoven | Keurentjes J.T.F.,TU Eindhoven
Soft Matter | Year: 2012

Drug release from a polymeric matrix has been externally triggered using an alternating magnetic field in order to develop an on-demand drug delivery implant. Superparamagnetic iron oxide nanoparticles have been distributed in a poly(methyl methacrylate) core, coated with a thermoresponsive layer of poly(butyl methacrylate-stat-methyl methacrylate) containing ibuprofen as a model drug. The release rate of ibuprofen reversibly increased, up to 25-fold, upon exposure to the magnetic field and was found to increase with higher iron oxide loading. Finally, magnetically triggered on-demand drug release was demonstrated under physiologically relevant conditions, namely 37 °C in PBS buffer with high ibuprofen content in the implant and only 15 minutes triggering time. © 2012 The Royal Society of Chemistry.

Vanparijs N.,Ghent University | Maji S.,Supramolecular Chemistry Group | Louage B.,Ghent University | Voorhaar L.,Supramolecular Chemistry Group | And 6 more authors.
Polymer Chemistry | Year: 2015

Efficient polymer-protein conjugation is a crucial step in the design of many therapeutic protein formulations including nanoscopic vaccine formulations, antibody-drug conjugates and to enhance the in vivo behaviour of proteins. Here we aimed at preparing well-defined polymers for conjugation to proteins by reversible addition-fragmentation chain transfer (RAFT) polymerization of both acrylates and methacrylamides with protein-reactive chain transfer agents (CTAs). These RAFT agents contain either a N-hydroxysuccinimide (NHS) or pentafluorophenyl (PFP) ester moiety that can be conjugated to lysine residues, and alternatively a maleimide (MAL) or pyridyl disulfide (PDS) moiety that can be conjugated to cysteine residues. Efficiency of the bioconjugation of these polymers to bovine and avian serum albumin was investigated as a function of stoichiometry, polymer molecular weight and the presence of reducing agents. A large molar excess of polymer was required to obtain an acceptable degree of protein conjugation. However, protein modification with N-succinimidyl-S-acetylthiopropionate (SATP) to introduce sulfhydryl groups onto primary amines, significantly increased conjugation efficiency with MAL- and PDS-containing polymers. This journal is © The Royal Society of Chemistry.

Zhang Z.,Ghent University | Schepens B.,Ghent University | Schepens B.,Inflammation Research Center | Nuhn L.,Ghent University | And 14 more authors.
Chemical Communications | Year: 2016

We report on a straightforward strategy to fabricate bioactive glycosylated gold nanoparticles via a combination of RAFT polymerization, carbohydrate ligation through reductive amination and thiol-gold self-assembly. This approach is used for the design of gold nanoparticles decorated with the complex sialylated glycan Neu5Ac-α-2-6-Gal, and we demonstrate multivalent and specific recognition between the nanoparticles, lectins and hemagglutinin on the surface of the influenza virus. © 2016 The Royal Society of Chemistry.

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