Redox voltammetry of sub-parts per billion levels of Cu2+ at polyaspartate-modified gold electrodes

Yang, Wenrong; Gooding, J. Justin; Hibbert, D. Brynn

doi:10.1039/b102898g

Cited by 78 publications

(67 citation statements)

References 40 publications

(40 reference statements)

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“…The solvents are slowly evaporated; after 5 days, a dry white solid is obtained which is washed thoroughly with dichloromethane and methanol. The product is analyzed by 13 C and 29 Si solid state NMR. The Boc protecting groups are then removed from the polymeric material by treatment with gaseous HCl.…”

Section: Synthesis Of the Silica-carnosine Hybrid Materials S-carmentioning

confidence: 99%

“…The proton ( 1 H) NMR spectra were recorded on a Bruker AM 400 or AC 250 spectrometer and the 29 Si and 13 C spectra of solid samples on a Bruker 300 apparatus. The proton chemical shifts d are reported in parts per million (d in ppm) downfield from internal tetramethylsilane (TMS).…”

Section: Instrumentationmentioning

confidence: 99%

“…Durable immobilization would require stronger attachment of the active centers to the electrode surface or within the porous structure of a composite electrode, ideally via a non hydrolyzable covalent bond. A recent successful example of this approach involves the functionalization of gold electrodes with polypeptide moieties via carbodiimide coupling to a monolayer of 3-mercaptopropionic acid [29].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Detection of Copper(II) at an Electrode Modified by a Carnosine–Silica Hybrid Material

et al. 2003

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A new solid-phase extractant based on carnosine moieties covalently attached to a silica backbone (S-Car) was introduced into a carbon paste electrode (CPE), and the resulting modified electrode (S-Car-MCPE) was applied to the preconcentration and subsequent voltammetric quantification of copper(II). The electrode modifier was a solid organic-inorganic hybrid prepared by co-condensation of tetraethoxysilane with an organotri-ethoxysilane containing a carnosine dipeptide (b-alanyl-l-histidine) derivative. This hybrid material has propensity for binding Cu II species from aqueous solutions. The basic voltammetric characterization of S-Car-MCPE, previously loaded with Cu II , indicates clearly that its electrochemical activity requires desorption of the analyte out of the solid material prior to undergoing charge transfer. A two-step analytical procedure was then applied, involving the sequence ™accumulation at open-circuit ± voltammetric detection by anodic stripping differential pulse voltammetry∫. Both these steps have been optimized with respect to various experimental parameters (electrode composition, pH and composition of both detection and accumulation media, preconcentration time, detection mode, presence of interference). Linear response to copper(II) was found in the 5 Â 10 À8 M to 10 À6 M concentration range, with a detection limit estimated at 4 Â 10 À9 M (0.06 ppb). This new immobilization approach for peptide-based materials on electrode surfaces is promising for further developments of organic-inorganic hybrids in electroanalysis.

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Section: Synthesis Of the Silica-carnosine Hybrid Materials S-carmentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Detection of Copper(II) at an Electrode Modified by a Carnosine–Silica Hybrid Material

et al. 2003

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“…20 SAMs-modified planar gold electrodes are widely used in the fabrication of metal ions sensors and biosensors since they exhibited excellent sensitivity and selectivity. [20][21][22][23][24][25] Nonetheless, a majority of solid-state metal ions sensors fabricated from a planar gold electrode were costly in terms of commercialization. Increased demand for developing simple, accurate and rapid devices for the in situ analysis of metal ions have made screen-printing electrodes as a primary choice in the construction of sensors and biosensors.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Aluminium(III) Ion Sensor Based on a Self-assembled Monolayer on a Gold Nanoparticles Modified Screen-printed Carbon Electrode

2015

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“…Several experimental techniques have been applied to present of specific interactions in metal ion-peptide complexes. [1][2][3][4][5][6][7][8] Conformations of metal ion binding to peptides may have a critical impact on the peptide folding processes and peptide biological functions. Among metal ions, Cu 2+ and Ni 2+ have been widely studied and seem to have most interesting chemistry.…”

mentioning

confidence: 99%

Ab initio Calculations for Exploring Metal Ion-(Gly-Gly-His) Complexes

Kim

2005

Bulletin of the Korean Chemical Society

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The specific interactions in metal ion-peptide systems have been studied in many research groups. It is known that the coordinated metal ions play a significant role in the biological action of peptide. Several experimental techniques have been applied to present of specific interactions in metal ion-peptide complexes. Theoretical approaches about metal-oligopeptide structure and metal-ligand coordination geometry have been also performed by molecular dynamics simulations and ab initio calculations.9-13 Studies have focused on the structural data of metal ion-ligand complexes. Four-coordination geometries were mainly discussed because they are most frequently encountered in the metal-binding sites of metalloproteins. Two-and six-coordination geometries were also considered.10,11 Several groups reported the interactions between the special oligopeptides of three or four amino acid residues and metal ion because those oligopeptides are principally capable of providing the saturated (four electron donor atoms) equatorial binding site. 1,2,6,13 In this study, our attention is focused on the interaction between the oligopeptide of three amino acid residues (GlyGly-His) and metal ion without solvent effect. (The response of the Gly-Gly-His modified electrode to Cu 2+ ion was measured as a current in the solution experiment of Fisher et al..2 ) The interaction between Gly-Gly-His and metal ion is studied by optimized structures and stabilization energies in ab initio calculations. Ab initio calculations are performed with 6-31G(d) and 6-311+G(d,p) basis sets to determine optimized structures and stabilization energies. Density functional theory(DFT) at B3LYP level is carried out using Gaussian98 14 series of program. The optimized structures and the stabilization energies between Gly-Gly-His and metal ions (Ca

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Redox voltammetry of sub-parts per billion levels of Cu2+ at polyaspartate-modified gold electrodes

Cited by 78 publications

References 40 publications

Electrochemical Detection of Copper(II) at an Electrode Modified by a Carnosine–Silica Hybrid Material

Electrochemical Detection of Copper(II) at an Electrode Modified by a Carnosine–Silica Hybrid Material

Highly Sensitive Aluminium(III) Ion Sensor Based on a Self-assembled Monolayer on a Gold Nanoparticles Modified Screen-printed Carbon Electrode

Ab initio Calculations for Exploring Metal Ion-(Gly-Gly-His) Complexes

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