Selective Determination Of Caffeic Acid In Wines With Electrochemical Sensor Based On Molecularly Imprinted Siloxanes

dc.creatorLeite F.R.F.
dc.creatorSantos W.D.J.R.
dc.creatorKubota L.T.
dc.date2014
dc.date2015-06-25T17:49:52Z
dc.date2015-11-26T15:26:36Z
dc.date2015-06-25T17:49:52Z
dc.date2015-11-26T15:26:36Z
dc.date.accessioned2018-03-28T22:35:17Z
dc.date.available2018-03-28T22:35:17Z
dc.identifier
dc.identifierSensors And Actuators, B: Chemical. , v. 193, n. , p. 238 - 246, 2014.
dc.identifier9254005
dc.identifier10.1016/j.snb.2013.11.028
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84890941958&partnerID=40&md5=1fcc7aff5fef4cba3cc8d16a346fecf8
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/85727
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/85727
dc.identifier2-s2.0-84890941958
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1261153
dc.descriptionCaffeic acid (CA) is one of the phenolic compounds widely found in wines and it is associated to the quality of this beverage and also to various beneficial effects on health. Thus, a novel electrochemical sensor based on molecularly imprinted siloxanes (MIS) film was developed for the highly selective determination of CA. The MIS film was prepared by sol-gel process, using the acid catalyzed hydrolysis and condensation of tetraethoxysilane (TEOS), phenyltriethoxysilane (PTEOS) and 3-aminopropyltrimethoxysilane (3-APTMS) in presence of CA as template molecule. The MIS film was immobilized onto Au electrode surface pre-modified with 3-mercaptopropyltrimethoxysilane (3-MPTS) and then characterized by Differential Pulse Voltammetry (DPV), Field Emission Scanning Electron Micrographs (FESEM) and Cross Polarization-Magic Angle Spinning Nuclear Magnetic Resonance of 29Si (29Si CP-MAS NMR). Under the optimized conditions, the sensor showed a linear current response to the target CA concentration in the range from 0.500 to 60.0 μmol/L, with a detection limit of 0.15 μmol/L. The film exhibited high selectivity toward the template CA, as well as good stability and repeatability for CA determinations as well as for sensor preparation. Furthermore, the proposed sensor was applied to determine CA in wines samples and the results were in agreement with those obtained by a chromatographic method. The acceptable values of recovery implied its feasibility for practical application. © 2013 Elsevier B.V.
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dc.languageen
dc.publisher
dc.relationSensors and Actuators, B: Chemical
dc.rightsfechado
dc.sourceScopus
dc.titleSelective Determination Of Caffeic Acid In Wines With Electrochemical Sensor Based On Molecularly Imprinted Siloxanes
dc.typeArtículos de revistas


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