Accumulation and stripping behavior of silver ions at ?-dithiothreitol self-assembled monolayer modified gold electrodes

Zeng, Baizhao; Ding, Xiaolei; Pan, Daocheng; Zhao, Faqiong

doi:10.1016/s0039-9140(02)00533-7

Cited by 19 publications

(8 citation statements)

References 18 publications

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“…1). DTT SAMs have been used to bind Ag + cations, 26 to immobilize gold nanoparticles, 27 to study heterogeneous binding of divalent metals, 28 and also to provide an hydroxylated substrate for sol-gel synthesis. 29 It has been reported that DTT self-assembly on Au(111) changes the contact angles of a water droplet on gold from 501 to 381.…”

Section: Introductionmentioning

confidence: 99%

Self-assembled dithiothreitol on Au surfaces for biological applications: phospholipid bilayer formation

Creczynski-Pasa

Millone

Munford

et al. 2009

Phys. Chem. Chem. Phys.

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Self-assembly of dithiothreitol (DTT) on Au(111) from solution deposition has been studied by X-ray photoelectron spectroscopy and electrochemical data. DTT molecules self-assemble on Au(111) in a lying-down configuration irrespective of the concentration and temperature. XPS and electrochemical data indicate a DTT surface coverage of theta approximately 0.16 with two S-head-Au covalent bonds per DTT molecule. The DTT monolayer turns the Au surface hydrophilic enough to allow the formation of fluid dimyristoylphosphatidylcholine (DMPC) bilayer domains by vesicle fusion as revealed by in situ atomic force imaging. Methylene blue (MB) and flavin adenine dinucleotide (FAD) have been used as probes to study molecule transport across the bilayer.

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Section: Introductionmentioning

confidence: 99%

Self-assembled dithiothreitol on Au surfaces for biological applications: phospholipid bilayer formation

Creczynski-Pasa

Millone

Munford

et al. 2009

Phys. Chem. Chem. Phys.

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“…Curve 3 in the insert in the top right corner of Figure 6 is the CV of nano-Ag/Thi/Nf modified electrode. A new couple of obvious waves observed can be attributed to the redox of the nano-Ag [20] . Although the nano-Ag was absorbed onto the Thi/Nf modified electrode surface, there is little increase of the redox waves of Thi.…”

Section: Optimization Of the Assay Conditionsmentioning

confidence: 92%

Determination of carcinoembryonic antigen using a novel amperometric enzyme-electrode based on layer-by-layer assembly of gold nanoparticles and thionine

et al. 2007

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Electrochemical sensing of carcinoembryonic antigen (CEA) on a gold electrode modified by the sequential incorporation of the mediator, thionine (Thi), and gold nanoparticles (nano-Au), through covalent linkage and electrostatic interactions onto a self-assembled monolayer configuration is described in this paper. The enzyme, horseradish peroxidase (HRP), was employed to block the possible remaining active sites of the nano-Au monolayer, avoid the non-specific adsorption, instead of bovine serum albumin (BSA), and amplify the response of the antigen-antibody reaction. Electrochemical experiments indicated highly efficient electron transfer by the imbedded Thi mediator and adsorbed nano-Au. The HRP kept its activity after immobilization, and the studied electrode showed sensitive response to CEA and high stability during a long period of storage. The working range for the system was 2.5 to 80.0 ng/mL with a detection limit of 0.90 ng/mL. The model membrane system in this work is a potential biosensor for mimicking the other immunosensor and enzyme sensor.immunosensor, gold nanoparticles (nano-Au), thionine (Thi), carcinoembryonic antigen (CEA), horseradish peroxidase (HRP), layer-by-layer (LBL) Carcinoembryonic antigen (CEA), an acidic glycoprotein, is a kind of important tumor marker [1] , associated with colon cancer, lung cancer, ovarian carcinoma and breast cancer [2] . A variety of methods and strategies have been reported for the determination of CEA, such as radioimmunoassay (RIA), enzyme immunoassay (ELISA) and immunohistochemical test (IHC). However, these methods are relative to radiation hazards, tedious assay time, qualified personnel and sophisticated instrumentation. As a result, alternative approaches to detect CEA in human serum are desirable [3][4][5] .The amperometric enzyme immunoassay manipulations coupled with the intrinsic selectivity and sensitivity of enzyme labeled on immunological components have gained considerable attention due to their simple design, high sensitivity and low cost in the last two decades [6] .However, most of amperometric immunoassay techniques rely on the label of either antigen or antibody, which requires highly qualified personnel, tedious assay time, or sophisticated instrumentation. Therefore, an increasing number of new enzyme immunosensors had been reported [7,8] . Here we developed a novel strategy, which employed the enzyme to block possible remaining active sites of the gold nanoparticles (nano-Au) monolayer instead of bovine serum albumin (BSA) and amplify the response of the antigen-antibody reaction at

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“…A number of analytical characteristics of the NBHAE-MCPE were compared with those previously reported for Ag(I) voltammetric sensors. 23,25,26,29,31,[34][35][36][37][38][39] The results are summarized in Table 4. As can be seen, the NBHAE-MCPE electrode shows better analytical characteristics, such as a lower detection limit and wider linear except, than previous reports.…”

Section: Comparison Of Nbhae-mcpe With Previously Reported Modified E...mentioning

confidence: 99%

Fabrication of a new multi-walled carbon nanotube paste electrode for stripping voltammetric determination of Ag(i)

Nadiki

Taher

Ashkenani

et al. 2012

Analyst

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A new modified carbon paste electrode based on multi-walled carbon nanotubes and a synthesized Schiff base of N,N'-bis(2-hydroxybenzylidene)-2,2'(aminophenylthio) ethane, acting as a chelating agent for Ag(I) ions, is described. The electroanalytical procedure for the determination of Ag(I) was comprised of two steps: the chemical accumulation of the analyte under open-circuit conditions followed by replacing the medium with a 0.1 M HCl solution where the accumulated Ag(I) was reduced for 20 s in -0.7 V. The potential was then scanned from -0.2 to +0.2 V to obtain the voltammetric peak. The effective parameters in the sensor response were examined. Under optimized operational conditions, a linear response range from 0.5-200 ng mL(-1) was obtained. The detection limit for silver determination was 0.092 ng mL(-1). For 7 successive determinations of 15.0 and 60.0 ng mL(-1) of Ag(I), relative standard deviations of 2.2% and 1.2% were obtained, respectively. The procedure was applied in determining Ag(I) in X-ray photographic films and water samples.

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Accumulation and stripping behavior of silver ions at ?-dithiothreitol self-assembled monolayer modified gold electrodes

Cited by 19 publications

References 18 publications

Self-assembled dithiothreitol on Au surfaces for biological applications: phospholipid bilayer formation

Self-assembled dithiothreitol on Au surfaces for biological applications: phospholipid bilayer formation

Determination of carcinoembryonic antigen using a novel amperometric enzyme-electrode based on layer-by-layer assembly of gold nanoparticles and thionine

Fabrication of a new multi-walled carbon nanotube paste electrode for stripping voltammetric determination of Ag(i)

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