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Modified electrodes used for electrochemical detection of metal ions in environmental analysis.

March G, Nguyen TD, Piro B - Biosensors (Basel) (2015)

Bottom Line: Many efforts have been made to develop sensors for monitoring heavy metals in the environment.The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond.Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

View Article: PubMed Central - PubMed

Affiliation: Klearia, route de Nozay, Marcoussis 91460, France. gregory.march@free.fr.

ABSTRACT
Heavy metal pollution is one of the most serious environmental problems, and regulations are becoming stricter. Many efforts have been made to develop sensors for monitoring heavy metals in the environment. This review aims at presenting the different label-free strategies used to develop electrochemical sensors for the detection of heavy metals such as lead, cadmium, mercury, arsenic etc. The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond. The second part will be dedicated to chemically modified electrodes especially those with conducting polymers. The last part of this review will focus on bio-modified electrodes. Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

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(A) GSH, γ-Glu–Cys and Cys–Gly electrografting; (B) Measured vs. expected concentrations for Cd2+. The LoD is below 20 ppb. Reprinted from [127] with permission from Elsevier.
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biosensors-05-00241-f018: (A) GSH, γ-Glu–Cys and Cys–Gly electrografting; (B) Measured vs. expected concentrations for Cd2+. The LoD is below 20 ppb. Reprinted from [127] with permission from Elsevier.

Mentions: Very recently, Serrano et al. [127] reported a three-electrode device in which each electrode was functionalized with a different peptide (glutathione, Cys–Gly and γ-Glu–Cys) through aryl diazonium electrografting. Cd2+, Pb2+ and Zn2+ were determined with this device, using differential pulse adsorptive stripping voltammetry (Figure 18).


Modified electrodes used for electrochemical detection of metal ions in environmental analysis.

March G, Nguyen TD, Piro B - Biosensors (Basel) (2015)

(A) GSH, γ-Glu–Cys and Cys–Gly electrografting; (B) Measured vs. expected concentrations for Cd2+. The LoD is below 20 ppb. Reprinted from [127] with permission from Elsevier.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493548&req=5

biosensors-05-00241-f018: (A) GSH, γ-Glu–Cys and Cys–Gly electrografting; (B) Measured vs. expected concentrations for Cd2+. The LoD is below 20 ppb. Reprinted from [127] with permission from Elsevier.
Mentions: Very recently, Serrano et al. [127] reported a three-electrode device in which each electrode was functionalized with a different peptide (glutathione, Cys–Gly and γ-Glu–Cys) through aryl diazonium electrografting. Cd2+, Pb2+ and Zn2+ were determined with this device, using differential pulse adsorptive stripping voltammetry (Figure 18).

Bottom Line: Many efforts have been made to develop sensors for monitoring heavy metals in the environment.The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond.Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

View Article: PubMed Central - PubMed

Affiliation: Klearia, route de Nozay, Marcoussis 91460, France. gregory.march@free.fr.

ABSTRACT
Heavy metal pollution is one of the most serious environmental problems, and regulations are becoming stricter. Many efforts have been made to develop sensors for monitoring heavy metals in the environment. This review aims at presenting the different label-free strategies used to develop electrochemical sensors for the detection of heavy metals such as lead, cadmium, mercury, arsenic etc. The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond. The second part will be dedicated to chemically modified electrodes especially those with conducting polymers. The last part of this review will focus on bio-modified electrodes. Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

Show MeSH