Electrochemical biosensors for on-chip detection of oxidative stress from immune cells

Jun Yan, Valber A. Pedrosa, James Enomoto, Aleksandr L. Simonian, Alexander Revzin

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Seamless integration of biological components with electrochemical sensors is critical in the development of microdevices for cell analysis. The present paper describes the integration miniature Au electrodes next to immune cells (macrophages) in order to detect cell-secreted hydrogen peroxide (H 2O 2). Photopatterning of poly(ethylene glycol) (PEG) hydrogels was used to both immobilize horseradish peroxidase molecules onto electrodes and to define regions for cell attachment in the vicinity of sensing electrodes. Electrodes micropatterned in such a manner were enclosed inside poly(dimethylsiloxane) fluid conduits and incubated with macrophages. The cells attached onto the exposed glass regions in the vicinity of the electrodes and nowhere else on the non-fouling PEG hydrogel surface. A microfluidic device was converted into an electrochemical cell by placing flow-through Ag/AgCl reference and Pt wire counter electrodes at the outlet and inlet, respectively. This microdevice with integrated H 2O 2-sensing electrodes had sensitivity of 27 μA/cm2 mM with a limit of detection of 2 μM. Importantly, this microdevice allowed controllable seeding of macrophages next to electrodes, activation of these cells and on-chip monitoring of H 2O 2 release in real time. In the future, this biosensor platform may be utilized for monitoring of macrophage responses to pathogens or for the study of inflammatory signaling in micropatterned cell cultures.

Original languageEnglish (US)
Article number032008
Issue number3
StatePublished - Sep 20 2011

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology
  • Condensed Matter Physics
  • Materials Science(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Electrochemical biosensors for on-chip detection of oxidative stress from immune cells'. Together they form a unique fingerprint.

Cite this