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Bioanalytical device based on cholesterol oxidase-bonded SAM-modified electrodes

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Abstract

A rapid, simple and reproducible two-step method for constructing cholesterol biosensors by covalently bonding cholesterol oxidase (ChOx) to a 3,3′-dithiodipropionic acid di(N-succinimidyl ester) (DTSP)-modified gold electrode is described. Exhaustive characterizations of both the immobilization process and the morphological properties of the resulting ChOx monolayer were performed via a quartz crystal microbalance (QCM) and atomic force microscopy (AFM) operated under liquid conditions, respectively. In addition, scanning electrochemical microscopy (SECM) measurements were performed in order to check that the immobilized enzyme retains its catalytic activity. The replacement of the natural electron acceptor (O2) in the enzymatic reaction with an artificial mediator, hydroxymethylferrocene (HMF), was also studied. Finally, cholesterol was amperometrically determined by measuring the hydrogen peroxide produced during the enzymatic reaction at +0.5 V. The optimized cholesterol biosensor exhibited a sensitivity of 54 nA mM−1 and a detection limit of 22 μM.

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Acknowledgments

This work has been partially supported by the Ministerio de Ciencia y Tecnología of Spain through projects CTQ2005-02816/BQU and BFM-2003-07749-C-05-2, and by the Comunidad Autónoma de Madrid-Universidad Autónoma de Madrid through project 12/TES/001.

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Authors and Affiliations

  1. Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049, Madrid, Spain

    A. Parra, E. Casero, F. Pariente & E. Lorenzo

  2. Instituto de Ciencia de Materiales de Madrid (CSIC), C/ Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain

    L. Vázquez

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  1. A. Parra
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  2. E. Casero
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  3. F. Pariente
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  4. L. Vázquez
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  5. E. Lorenzo
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Correspondence to E. Lorenzo.

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Parra, A., Casero, E., Pariente, F. et al. Bioanalytical device based on cholesterol oxidase-bonded SAM-modified electrodes. Anal Bioanal Chem 388, 1059–1067 (2007). https://doi.org/10.1007/s00216-007-1187-1

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  • DOI: https://doi.org/10.1007/s00216-007-1187-1

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