Self assembled monolayer based surface plasmon resonance biosensors for pathogen detection

Anand S. Subramanian, Joseph M. Irudayaraj, Chitrita Debroy

Research output: Contribution to conferencePaperpeer-review


Surface plasmon resonance (SPR) is a rapid and label-free detection technique for the detection of pathogenic microorganisms. A preliminary study to investigate the capability of an alkanethiol mixed self assembled monolayer (SAM) based SPR biosensor to detect pathogens was demonstrated. A protocol for the detection of pathogens suspended in phosphate buffered saline with Tween 20 (PBST) (pH 7.4) was developed. Antisera against Escherichia coli O157:H7 suspended in sodium acetate (NaOAc) (pH 5.5) was immobilized on an activated sensor chip. Escherichia coli O157:H7 broth was diluted in PBST and passed over the immobilized antibodies to run a direct assay. For sandwich assays anti-Escherichia coli O157:H7 sera suspended in PBST was passed over the bound bacteria. Sandwich assay produced an enhanced signal compared to direct assay. Results indicate that a SAM based SPR biosensor has the potential for rapid detection of pathogens by monitoring the biomolecular interactions on the sensor surface.

Original languageEnglish (US)
Number of pages8
StatePublished - 2004
Externally publishedYes
EventASAE Annual International Meeting 2004 - Ottawa, ON, Canada
Duration: Aug 1 2004Aug 4 2004


OtherASAE Annual International Meeting 2004
CityOttawa, ON


  • Pathogen Detection
  • Self Assembled Monolayers
  • Surface Plasmon Resonance

ASJC Scopus subject areas

  • General Engineering


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