Medical Engineering & Physics
Volume 28, Issue 10 , Pages 978-981, December 2006

Optical biodetection of cadmium and lead ions in water

  • Saharudin Haron

      Affiliations

    • Department of Chemical Engineering, Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
    • ,
  • Asim K. Ray

      Affiliations

    • Nanotechnology Laboratories, The Department of Materials, Queen Mary College, University of London, Mile End Road, London E1 4NS, UK
    • Corresponding Author InformationCorresponding author.

Received 28 April 2006; accepted 28 April 2006. published online 04 October 2006.

Abstract 

A three layer waveguiding silicon dioxide (SiO2)/silicon nitride (Si3N4)/SiO2 structure on silicon substrate was proposed as an optically efficient biosensor for calibration of heavy metal ions in drinking water. The catalytic activities of urease and acetylcholine esterase (AchE) were inhibited by the presence of cadmium (Cd2+) and lead (Pb2+) ions. The detection limit as low as 1ppb was achieved by employing the technique of total reflection at the interface between the Si3N4 core and composite polyelectrolyte self-assembled (PESA) membranes containing cyclotetrachromotropylene (CTCT) as an indicator.

Keywords: Optical biosensors, Enzyme reactions, Heavy metal ions

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PII: S1350-4533(06)00168-8

doi:10.1016/j.medengphy.2006.04.004

Medical Engineering & Physics
Volume 28, Issue 10 , Pages 978-981, December 2006

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