8 research outputs found
Comparison of olfactometrically detected compounds and aroma properties of four different edible parts of Chinese mitten crab
Molecular gated nanoporous anodic alumina for the detection of cocaine
[EN] We present herein the use of nanoporous anodic alumina (NAA) as a suitable support to implement
molecular gates for sensing applications. In our design, a NAA support is loaded with a fluorescent
reporter (rhodamine B) and functionalized with a short single-stranded DNA. Then pores are blocked
by the subsequent hybridisation of a specific cocaine aptamer. The response of the gated material
was studied in aqueous solution. In a typical experiment, the support was immersed in hybridisation
buffer solution in the absence or presence of cocaine. At certain times, the release of rhodamine B from
pore voids was measured by fluorescence spectroscopy. The capped NAA support showed poor cargo
delivery, but presence of cocaine in the solution selectively induced rhodamine B release. By this simple
procedure a limit of detection as low as 5 Ă 10−7 M was calculated for cocaine. The gated NAA was
successfully applied to detect cocaine in saliva samples and the possible re-use of the nanostructures
was assessed. Based on these results, we believe that NAA could be a suitable support to prepare
optical gated probes with a synergic combination of the favourable features of selected gated sensing
systems and NAA.We thank Projects MAT2015-64139-C4-1-R and TEC2015-71324-R (MINECO/FEDER), the Catalan Government (Project 2014 SGR 1344), the ICREA (ICREA2014 Academia Award) and the Generalitat Valenciana (Project PROMETEOII/2014/047) for support. We also thank to the Agencia Espanola del Medicamento y Productos Sanitarios for its concessions. A.R. thanks the UPV for her predoctoral fellowship. The authors also thank the Electron Microscopy Service at UPV for support.Ribes, Ă.; Xifre Perez, E.; Aznar, E.; SancenĂłn Galarza, F.; Pardo Vicente, MT.; Marsal, LF.; MartĂnez-Måñez, R. (2016). Molecular gated nanoporous anodic alumina for the detection of cocaine. Scientific Reports. 6. https://doi.org/10.1038/srep38649S386496Nadrah, P., PlaninĆĄek, O. & GaberĆĄÄek, M. Stimulus-responsive Mesoporous Silica Particles. J. Mater. Sci. 49, 481â495 (2014).Baeza, A., Colilla, M. & Vallet-RegĂ, M. Advances in Mesoporous Silica Nanoparticles for Targeted Stimuli-Responsive Drug Delivery. 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