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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/30780

    Título
    Detection of Catechol using Mixed Langmuir-Blodgett Films of a Phospholipid and Phthalocyanines as Voltammetric Sensors
    Autor
    Rodríguez Méndez, María LuzAutoridad UVA Orcid
    Alessio, Priscila
    Pavinato, Felippe J.
    Oliveira, Osvaldo N.
    Saja Saez, José Antonio DeAutoridad UVA Orcid
    Constantino, Carlos José Leopoldo
    Año del Documento
    2010
    Descripción
    Producción Científica
    Documento Fuente
    Analyst vol. 135 p. 2591-2599
    Resumen
    The 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 (LuPc2) were applied as ITO modified-electrodes in the detection of catechol using cyclic voltammetry. The mixed Langmuir films of FePc + DMPA and LuPc2 + 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 LuPc2 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 × 10−7 and 3.34 × 10−7 M for FePc + DMPA and LuPc2 + 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.
    ISSN
    0003-2654
    Revisión por pares
    SI
    DOI
    10.1039/C0AN00159G
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/30780
    Derechos
    openAccess
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    • DEP63 - Artículos de revista [322]
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