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dc.contributor.authorAlessio, Priscila-
dc.contributor.authorPavinatto, Felippe J.-
dc.contributor.authorOliveira, Osvaldo N.-
dc.contributor.authorDe Saja Saez, Jose Antonio-
dc.contributor.authorConstantino, Carlos J. L.-
dc.contributor.authorLuz Rodriguez-Mendez, Maria-
dc.identifier.citationAnalyst. Cambridge: Royal Soc Chemistry, v. 135, n. 10, p. 2591-2599, 2010.-
dc.description.abstractThe combination of metallic phthalocyanines (MPcs) and biomolecules has been explored in the literature either as mimetic systems to investigate molecular interactions or as supporting layers to immobilize biomolecules. Here, Langmuir-Blodgett (LB) films containing the phospholipid dimyristoyl phosphatidic acid (DMPA) mixed either with iron phthalocyanine (FePc) or with lutetium bisphthalocyanine (LuPc(2)) were applied as ITO modified-electrodes in the detection of catechol using cyclic voltammetry. The mixed Langmuir films of FePc + DMPA and LuPc(2) + DMPA displayed surface-pressure isotherms with no evidence of molecular-level interactions. The Fourier Transform Infrared (FTIR) spectra of the multilayer LB films confirmed the lack of interaction between the components. The DMPA and the FePc molecules were found to be oriented perpendicularly to the substrate, while LuPc(2) molecules were randomly organized. The phospholipid matrix induced a remarkable electrocatalytic effect on the phthalocyanines; as a result the mixed LB films deposited on ITO could be used to detect catechol with detection limits of 4.30 x 10(-7) and 3.34 x 10(-7) M for FePc + DMPA and LuPc(2) + DMPA, respectively. Results from kinetics experiments revealed that ion diffusion dominated the response of the modified electrodes. The sensitivity was comparable to that of other non-enzymatic sensors, which is sufficient to detect catechol in the food industry. The higher stability of the electrochemical response of the LB films and the ability to control the molecular architecture are promising for further studies with incorporation of biomolecules.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
dc.description.sponsorshipMICINN, Spain-
dc.publisherRoyal Soc Chemistry-
dc.sourceWeb of Science-
dc.titleDetection of catechol using mixed Langmuir-Blodgett films of a phospholipid and phthalocyanines as voltammetric sensorsen
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniv Valladolid-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv São Paulo, Inst Fis São Carlos, BR-13566590 São Paulo, Brazil-
dc.description.affiliationUniv Valladolid, Fac Ciencias, E-47011 Valladolid, Spain-
dc.description.affiliationUniv Valladolid, ETS Ingenieros Ind, E-47011 Valladolid, Spain-
dc.description.affiliationUnesp Univ Estadual Paulista, Fac Ciencias & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil-
dc.description.affiliationUnespUnesp Univ Estadual Paulista, Fac Ciencias & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil-
dc.description.sponsorshipIdCAPES: 118/06-
dc.description.sponsorshipIdMICINN, Spain: PHB2005-0057-PC-
dc.rights.accessRightsAcesso restrito-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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