Identification and characterisation of Staphylococcus aureus on low cost screen printed carbon electrodes using impedance spectroscopy

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Abstract

Staphylococcus aureus infections are a cause of significant morbidity and mortality, in addition to representing a considerable economic burden. The aim of this study was to explore a low cost screen printed electrode as a sensor for the detection of S. aureus using impedance spectroscopy. S. aureus was incubated in chambers containing the electrodes and the results analysed using a novel normalisation approach. These results show that it is possible to detect the presence of S. aureus in LB media after 30 minutes incubation of a 1% growth culture, in addition to being able to see immediate cell concentration dependent changes in 0.9% NaCl. These observations imply that a number of electrochemical mechanisms cause a change in the impedance as a result of the presence of S. aureus, including adsorption to the electrode surface and the metabolism of the bacteria during growth. The study suggests that this detection approach would be useful in a number of clinical scenarios where S. aureus leads to difficult to treat infections.
Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalBiosensors and Bioelectronics
Volume110
Early online date22 Mar 2018
DOIs
Publication statusPublished - 31 Jul 2018

Keywords

  • screen printing
  • impedance spectroscopy
  • low cost diagnostics
  • Staphylococcus aureus
  • rapid testing
  • bacteria

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