Profiling of oxygen in biofilms using individually addressable disk microelectrodes on a microfabricated needle

Ana Moya, Xavier Guimerà, Francisco Javier del Campo, Elisabet Prats-Alfonso, Antonio David Dorado, Mireia Baeza, Rosa Villa, David Gabriel, Xavier Gamisans, Gemma Gabriel

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

© 2014, Springer-Verlag Wien. A novel microelectrode array sensor was fabricated using MEMS technology on a needle, and then applied to real-time measurement of dissolved oxygen (DO) inside biofilms. The sensor consists of eleven gold disk microelectrodes, a rectangular auxiliary electrode along them, and an external and internal reference electrode. Three kinds of sensors were designed and their responses were characterized and evaluated under various conditions. The arrays exhibit a linear response to DO in the 0–8 mg·L−1 concentration range in water, high sensitivity, repeatability, and low limits of detection (<0.11 mg·L−1 of DO) and quantification (0.38 mg·L−1 DO). The sensors were validated against a commercial Clark-type microelectrode and applied to profiling of DO in a heterotrophic biofilm cultivated in a flat-plate bioreactor. It is shown that the sensor array can provide a multipoint, simultaneous snapshot profile of DO inside a biofilm with high spatial resolution due to its micrometric dimensions. We conclude that this new sensor array represents a powerful tool for sensing of DO biofilms and in numerous bioprocesses.[Figure not available: see fulltext.]
Original languageEnglish
Pages (from-to)985-993
JournalMicrochimica Acta
Volume182
Issue number5-6
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Biofilms
  • Bioprocess monitoring
  • Dissolved oxygen
  • Microelectrode array
  • Sensors

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