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Microchimica Acta

, Volume 181, Issue 1–2, pp 79–87 | Cite as

Lactate biosensor based on a bionanocomposite composed of titanium oxide nanoparticles, photocatalytically reduced graphene, and lactate oxidase

  • Elena CaseroEmail author
  • Concepción Alonso
  • María Dolores Petit-Domínguez
  • Luis Vázquez
  • Ana María Parra-Alfambra
  • Pablo Merino
  • Susana Álvarez-García
  • Alicia de Andrés
  • Edna Suárez
  • Félix Pariente
  • Encarnación LorenzoEmail author
Original Paper

Abstract

We have developed a lactate biosensor based on a bionanocomposite (BNC) composed of titanium dioxide nanoparticles (TiO2-NPs), photocatalytically reduced graphene, and lactate oxidase. Graphene oxide was photochemically reduced (without using any chemical reagents) in the presence of TiO2-NPs to give graphene nanosheets that were characterized by atomic force microscopy, Raman and X-ray photoelectron spectroscopy. The results show the nanosheets to possess few oxygen functionalities only and to be decorated with TiO2-NPs. These nanosheets typically are at least 1 μm long and have a thickness of 4.2 nm. A BNC was obtained by mixing lactate oxidase with the nanosheets and immobilized on the surface of a glassy carbon electrode. The resulting biosensor was applied to the determination of lactate. Compared to a sensor without TiO2-NPs, the sensor exhibits higher sensitivity (6.0 μA mM−1), a better detection limit (0.6 μM), a wider linear response (2.0 μM to 0.40 mM), and better reproducibility (3.2 %).

Keywords

Bionanocomposite Photocatalitically reduced graphene Titanium dioxide NPs Biosensors platforms Lactate oxidase 

Notes

Acknowledgments

This work has been supported by Comunidad Autónoma de Madrid (project No. S2009/PPQ-1642, AVANSENS), Ministerio de Ciencia e Innovación (project No. CTQ2011-28157) and Ministerio de Economía y Competitividad (project No. FIS2012-38866-C05-05). We want to give thanks to Noemí González Díaz and Mario Ramírez Fernández from XRD polycrystalline laboratory of SIdI (UAM). P.M. thanks INTA for a “Rafael Calvo Rodés” FPI scholarship.

Supplementary material

604_2013_1070_MOESM1_ESM.doc (879 kb)
ESM 1 (DOC 879 kb)

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Copyright information

© Springer-Verlag Wien 2013

Authors and Affiliations

  • Elena Casero
    • 1
    Email author
  • Concepción Alonso
    • 2
  • María Dolores Petit-Domínguez
    • 1
  • Luis Vázquez
    • 3
  • Ana María Parra-Alfambra
    • 1
  • Pablo Merino
    • 4
  • Susana Álvarez-García
    • 3
  • Alicia de Andrés
    • 3
  • Edna Suárez
    • 1
  • Félix Pariente
    • 1
  • Encarnación Lorenzo
    • 1
    Email author
  1. 1.Departamento de Química Analítica y Análisis InstrumentalFacultad de CienciasMadridSpain
  2. 2.Departamento de Química Física AplicadaFacultad de CienciasMadridSpain
  3. 3.Instituto de Ciencia de Materiales de Madrid (CSIC)MadridSpain
  4. 4.Centro de Astrobiología, INTA-CSICMadridSpain

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