Biofunctionalization process of a-SiC:H surfaces applied to an interdigitated microelectrode array to detect enterotoxigenic Escherichia coli

José Herrera-Celis, Claudia Reyes-Betanzo, Abdu Orduña-Díaz, Ana Pérez-Coyotl, Armando Hernández-Flores, Janet Morales-Chávez, Arely Culebro-Gomez

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

A biofunctionalization process of a-SiC:H surfaces has been applied to an interdigitated microelectrode array (IMA) whose microelectrodes are covered by this material. The biofunctionalization process has been monitored stage by stage using Fourier transform infrared spectroscopy (FTIR), while its effects on the electrical behavior of the IMA were recorded in electrical impedance spectra. The process involves hydroxylation, silanization, generation of aldehyde groups, binding via protein A, immobilization of anti-Escherichia coli polyclonal antibodies, entrapping and detection of enterotoxigenic Escherichia coli (ETEC) in Luria-Bertani medium. The FTIR spectra confirm the success of the process. Regarding the performance of the IMA, although the detection of ETEC is successful and its percentage change in impedance reaches a value of 133.37% to 107 CFU/mL, some considerations may be taken into account to improve the sensitivity of the IMA by mean of the optimization of both the IMA design and the biofunctionalization process.

Original languageEnglish
Title of host publication7th Latin American Congress on Biomedical Engineering, CLAIB 2016
EditorsJohn Bustamante, Daniel A. Sierra, Isnardo Torres
PublisherSpringer Verlag
Pages34-37
Number of pages4
ISBN (Print)9789811040856
DOIs
StatePublished - 2017
Event7th Latin American Congress on Biomedical Engineering, CLAIB 2016 - Bucaramanga, Santander, Colombia
Duration: 26 Oct 201628 Oct 2016

Publication series

NameIFMBE Proceedings
Volume60
ISSN (Print)1680-0737

Conference

Conference7th Latin American Congress on Biomedical Engineering, CLAIB 2016
Country/TerritoryColombia
CityBucaramanga, Santander
Period26/10/1628/10/16

Keywords

  • Biofunctionalization process
  • Electrical impedance spectroscopy
  • Enterotoxigenic Escherichia coli
  • Fourier transform infrared spectroscopy
  • Hydrogenated amorphous silicon carbide

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