Effect of surfactants on the signal of chemically modified amperometric electrodes

Geza Nagy, Imre Kapui, Lo Gorton

Research output: Contribution to journalArticle

6 Citations (Scopus)


A special electrochemical pretreatment has been employed for a finely polished glassy carbon electrode surface to increase the adsorption of Meldola blue (7-dimethylamino-1,2-benzo-phenoxazine) redox mediator. The chemically modified glassy carbon electrode holding the adsorptive mediator layer can be used to measure NADH concentration amperometrically. The interfering effect of non-ionic surfactants has been studied in the case of NADH measurements using a rotating-disc electrode technique and flow-injection analysis (FIA) measurements. The glassy carbon electrode response is less affected and could be generated much more easily than the response of a similar spectrographic graphite-based electrode studied earlier. Surface-active agents can influence the apparent coverage of the surface by the mediator.

Original languageEnglish
Pages (from-to)323-327
Number of pages5
JournalSensors and Actuators: B. Chemical
Issue number1-3
Publication statusPublished - Mar 1995


  • Amperometric electrodes
  • Chemical modification
  • Surfactants

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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