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Novel synthetic phytochelatin-based capacitive biosensor for heavy metal ion detection
Ibolya Bontidean1, Josefin Ahlqvist, Ashok Mulchandani
1Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00, Lund, Sweden.
Biosensors & Bioelectronics
|April 23, 2003
Summary
A new capacitance biosensor uses synthetic phytochelatins for detecting heavy metals like mercury and cadmium. This biosensor offers sensitive detection and can be regenerated, showing promise for environmental monitoring.
Area of Science:
- Environmental Science
- Biotechnology
- Analytical Chemistry
Background:
- Heavy metal contamination poses significant environmental and health risks.
- Developing sensitive and selective detection methods for heavy metals is crucial.
Purpose of the Study:
- To develop a novel capacitance biosensor for sensitive heavy metal detection.
- To utilize synthetic phytochelatins as the biological sensing element.
Main Methods:
- Expression and purification of synthetic phytochelatin (Glu-Cys)20Gly (EC20) fused to a maltose binding domain protein in Escherichia coli.
- Construction of a capacitance biosensor using the purified protein.
- Testing the biosensor's ability to detect Hg(2+), Cd(2+), Pb(2+), Cu(2+), and Zn(2+) ions.
Main Results:
- The biosensor detected heavy metal ions in the concentration range of 100 fM to 10 mM.
- The order of sensitivity was determined as Zn(2+) > Cu(2+) > Hg(2+) >> Cd(2+) ≈ Pb(2+).
- The biosensor demonstrated regeneration using EDTA and had a storage stability of 15 days.
Conclusions:
- A novel and sensitive capacitance biosensor for heavy metal detection has been successfully developed.
- The use of synthetic phytochelatins offers a promising approach for biosensor construction.
- The biosensor's characteristics suggest potential applications in environmental monitoring and heavy metal analysis.