Nanosensors having dipicolinic acid imprinted nanoshell for Bacillus cereus spores detection
Source: Journal of Nanoparticle Research, Volume 12, Number 6, August 2010 , pp. 2069-2079(11)
Abstract:Molecular imprinted polymers (MIPs) as a recognition element for sensors are increasingly of interest and MIP nanoclusters have started to appear in the literature. In this study, we have proposed a novel thiol ligand-capping method with polymerizable methacryloylamido-cysteine (MAC) attached to gold–silver nanoclusters, reminiscent of a self-assembled monolayer and have reconstructed surface shell by synthetic host polymers based on molecular imprinting method for recognition. In this method, methacryloylamidoantipyrine–terbium ((MAAP)2–Tb(III)) has been used as a new metal-chelating monomer via metal coordination–chelation interactions and dipicolinic acid (DPA) which is main participant of Bacillus cereus spores used as a model. Nanoshell sensors with templates give a cavity that is selective for DPA. The DPA can simultaneously chelate to Tb(III) metal ion and fit into the shape-selective cavity. Thus, the interaction between Tb(III) ion and free coordination spheres has an effect on the binding ability of the gold–silver nanoclusters nanosensor. The binding affinity of the DPA imprinted nanoclusters has been investigated by using the Langmuir and Scatchard methods, and the respective affinity constants (K affinity) determined were found to be 1.43 × 104 and 9.1 × 106 mol L−1.
Document Type: Research Article
Affiliations: 1: Department of Chemistry, Trakya University, Edirne, Turkey 2: Department of Chemistry, Faculty of Science, Yunusemre Campus , Anadolu University, 26470, Eskisehir, Turkey 3: Department of Biology, Anadolu University, Eskisehir, Turkey 4: Department of Chemistry, Hacettepe University, Ankara, Turkey 5: Department of Chemistry, Faculty of Science, Yunusemre Campus , Anadolu University, 26470, Eskisehir, Turkey, Email: firstname.lastname@example.org
Publication date: August 1, 2010