Journal
JOURNAL OF MOLECULAR RECOGNITION
Volume 24, Issue 4, Pages 619-630Publisher
WILEY
DOI: 10.1002/jmr.1097
Keywords
molecular imprinting; NMR spectroscopy; dynamic light scattering; precipitation polymerization; nanoparticles
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Funding
- Swedish Research Council
- Swedish Research Council FORMAS
- National Natural Science Foundation of China [20675003]
- Crafoord Foundation
- China Scholarship Council
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Molecular imprinting is a powerful synthetic technique for generating template-defined binding sites in cross-linked polymers. One scientific challenge in molecular imprinting research is to understand the intermolecular interactions leading to molecular complexation and the process of binding site formation during polymerization. In this work, we present a novel method for studying the molecular imprinting process in precipitation polymerization systems. This method employs solution H-1 NMR and dynamic light scattering (DLS) to investigate the association of template molecules with colloidal particles and the dynamic process of particle growth. Under precipitation polymerization conditions, the colloidal particles formed did not interfere with NMR signals from the soluble components, allowing unreacted monomers and free template to be easily quantified. To examine the process of particle nucleation and growth, DLS was used to measure the hydrodynamic particle size at different reaction times. To corroborate the interpretation of the NMR and DLS results, imprinted nanoparticles were collected at different reaction times and their binding characteristics were evaluated using radioligand-binding analysis. Our experimental results provide new insights into the molecular imprinting process that will be useful in the development of new imprinted nanoparticles. Copyright (C) 2010 John Wiley & Sons, Ltd.
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