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Optical biodetection of cadmium and lead ions in water

Haron, Saharudin and Ray, Asim K. (2006) Optical biodetection of cadmium and lead ions in water. Medical Engineering and Physics, 28 (10). pp. 978-981. ISSN 1350-4533

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Official URL: http://dx.doi.org/10.1016/j.medengphy.2006.04.004

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 1 ppb 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.

Item Type:Article
Uncontrolled Keywords:enzyme reactions, heavy metal ions, optical biosensors
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:9045
Deposited By: Nurunnadiah Baharum
Deposited On:27 Jul 2009 03:29
Last Modified:27 Jul 2009 03:29

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