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Sensors 2008, 8(1), 582-593; doi:10.3390/s8010582
Article

Using Monoclonal Antibody to Determine Lead Ions with a Localized Surface Plasmon Resonance Fiber-optic Biosensor

*  and
Department of Chemical Engineering, National Chung-Cheng University, Chia-Yi 621, Taiwan
* Author to whom correspondence should be addressed.
Received: 4 October 2007 / Accepted: 24 January 2008 / Published: 25 January 2008
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Abstract

A novel reflection-based localized surface plasmon resonance (LSPR) fiber-optic probe has been developed to determine the heavy metal lead ion concentration. Monoclonal antibody as the detecting probe containing massive amino groups to capture Pb(II)-chelate complexes was immobilized onto gold nanoparticle-modified optical fiber (NMAuOF). The optimal immobilizing conditions of monoclonal antibody on to the NMAuOF are 189 μg/mL in pH7.4 PBS for 2 h at 25°C. The absorbability of the functionalized NMAuOF sensor increases to 12.2 % upon changing the Pb(II)-EDTA level from 10 to 100 ppb with a detection limit of 0.27 ppb. The sensor retains 92.7 % of its original activity and gives reproducible results after storage in 5% D-( )-Trehalose dehydrate solution at 4°C for 35 days. In conclusion, the monoclonal antibody-functionalized NMAuOF sensor shows a promising result for determining the concentration of Pb(II) with high sensitivity.
Keywords: localized surface plasmon resonance; biosensor; gold nanoparticle; monoclonal antibody; lead-chelate complex. antibody; lead-chelate complex localized surface plasmon resonance; biosensor; gold nanoparticle; monoclonal antibody; lead-chelate complex. antibody; lead-chelate complex
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Lin, T.-J.; Chung, M.-F. Using Monoclonal Antibody to Determine Lead Ions with a Localized Surface Plasmon Resonance Fiber-optic Biosensor. Sensors 2008, 8, 582-593.

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