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Reference type: Journal
Authors: Belitsky JM, Lye DS, Gittleman HR, Gorlin TA, Gorham AN, Moore CA, Chaves MB, Ellowitz MZ
Article Title: Colorimetric metal ion binding of catechol-based coatings inspired by melanin and molecular imprinting.
Publication date: 2014
Journal: Supramolecular Chemistry
Volume: 26
Issue: (3-4)
Page numbers: 233-244.
DOI: 10.1080/10610278.2013.852672

Abstract: Catechol-containing biomolecules and related synthetic materials are of interest for a broad range of applications. Our group has been interested in the potential of eumelanin, a catechol-containing biomaterial and the black-to-brown pigment in humans, and synthetic eumelanin analogues for water purification applications. In an attempt to apply the strategy of molecular imprinting towards lead-binding synthetic eumelanin coatings, we developed a PbO2-mediated synthesis that was subsequently tested with a number of catechols in addition to the eumelanin and polydopamine monomers l-dopa and dopamine. Although this strategy did not provide significant improvements in affinity or selectivity, we found that the PbO2-mediated oxidative polymerisation of 1,2-dihydroxybenzene generates a coating that darkens visibly upon binding Pb2+ and other metal ions. Oxidative polymerisation of catechol with sodium periodate also yields a coating with this colorimetric response. Of eight metal ions tested, the coatings are most responsive to Pb2+ and Cu2+, as analysed by quantitative colorimetry. With further optimisation, these coatings could prove useful for the colorimetric sensing of metal ions
Template and target information: lead ion, Pb(II), copper ion, Cu(II)
Author keywords: Catechol, melanin, molecular imprinting, colorimetric, metal ions

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