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Journal of Solid State Electrochemistry

, Volume 22, Issue 5, pp 1321–1330 | Cite as

Optimization and characterization of a biosensor assembly for detection of Salmonella Typhimurium

  • A. M. A. Melo
  • D. L. Alexandre
  • M. R. F. Oliveira
  • R. F. Furtado
  • M. F. Borges
  • P. R. V. Ribeiro
  • A. Biswas
  • H. N. Cheng
  • C. R. Alves
  • E. A. T. Figueiredo
Original Paper

Abstract

The performance of biosensors depends directly on the strategies adopted during their development. In this paper, a fast and sensitive biosensor for Salmonella Typhimurium detection was assembled by using optimization studies in separate stages. The pre-treatment assays, biomolecular immobilization (primary antibody and protein A concentrations), and analytical response (hydroquinone and hydrogen peroxide concentrations) were optimized via voltammetric methods. In the biosensor assembly, a gold surface was modified via the self-assembled monolayer technique (SAM) using cysteamine thiol and protein A for immobilization of anti-Salmonella antibody. The analytical response of the biosensor was obtained through the use of a secondary antibody labeled with a peroxidase enzyme, and the signal was evaluated by applying the chronoamperometry technique. The biosensor was characterized by infrared spectroscopy and cyclic voltammetry. Optimization of protein A and primary antibody concentrations enabled higher analytical signals of 7.5 and 75 mg mL−1, respectively, to be achieved. The hydroquinone and H2O2 concentrations selected were 3 and 300 mM, respectively. The biosensor developed attained a very low detection limit of 10 CFU mL−1 and a fast response with a final detection time of 125 min. These results indicate that this biosensor is very promising for the food safety and emergency response applications.

Keywords

Salmonella Immunosensor Amperometric Pathogen Rapid detection 

Notes

Acknowledgements

The authors would like to thank the Brazilian agencies, CNPq, FUNCAP, and CAPES, for their financial support, Embrapa Tropical Agroindustry and National Center of Energy and Materials Research (CNPEM). Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • A. M. A. Melo
    • 1
  • D. L. Alexandre
    • 2
  • M. R. F. Oliveira
    • 2
  • R. F. Furtado
    • 3
  • M. F. Borges
    • 3
  • P. R. V. Ribeiro
    • 3
  • A. Biswas
    • 4
  • H. N. Cheng
    • 5
  • C. R. Alves
    • 2
  • E. A. T. Figueiredo
    • 1
  1. 1.Department of Science and Food TechnologyFederal University of CearáFortalezaBrazil
  2. 2.Department of ChemistryFortalezaBrazil
  3. 3.Embrapa Tropical AgroindustryFortalezaBrazil
  4. 4.USDA Agricultural Research ServiceNational Center for Agricultural Utilization ResearchPeoriaUSA
  5. 5.USDA Agricultural Research Service, Southern Regional Research CenterNew OrleansUSA

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