Detection of Tl(I) Transport through a Gramicidin−Dioleoylphosphatidylcholine Monolayer Using the Substrate Generation−Tip Collection Mode of Scanning Electrochemical Microscopy

Mauzeroll, Janine; Buda, Mihai; Bard, Allen J.; Prieto, Francisco; Rueda, M.

doi:10.1021/la0262710

Cited by 42 publications

(29 citation statements)

References 40 publications

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“…This method holds great promise for its potential application in situ by coating Hg on microelectrodes with capillary electrophoresis and dialysis techniques. Combined with other modern analytical techniques, [36][37][38] it might be anticipated to play a unique role in direct detecting free radicals generated in biooxidation of DA for the studies of the mechanism of AD relating to the Al toxicity. 29,39 ANALYTICAL SCIENCES NOVEMBER 2007, VOL.…”

Section: Discussionmentioning

confidence: 99%

Direct Voltammetric Specific Recognition of Dopamine Using AlIII-DA Complexes at the Hanging Mercury Drop Electrode

Zhang

Cheng

et al. 2007

ANAL. SCI.

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In this paper, we firstly report the direct voltammetric recognition and determination of dopamine (DA) by using Al III -DA complexes at the hanging mercury drop electrode (HMDE). A new sensitive cathodic peak of Al III -DA can be detected at -900 mV (vs. SCE) in 0.1 M NH4Cl-NH3·H2O-0.1 M KCl buffer solution at pH 8.5. This unique -900 mV cathodic peak arises from the specific interaction between Al III and DA on the HMDE, whereas other substances with similar structures, such as L-dopa, epinephrine (EP), norepinephrine (NE), catechols, caffeic acid (CA), trihydric phenols and tiron, do not yield any new peak on the voltammograms in the potential range from -100 to -1200 mV when Al III is added. The distinct voltammetric characteristic of the recognition of DA can effectively inhibit the interferences of both ascorbic acid and uric acid in the DA determination by the direct electrochemistry, which is a major difficulty when a solid electrode is used. The proposed method can be anticipated as an effective means for the recognition of DA in the elucidation of the mechanisms of Parkinson's disease (PD) and Alzheimer's disease (AD) in the presence of Al III .

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Section: Discussionmentioning

confidence: 99%

Direct Voltammetric Specific Recognition of Dopamine Using AlIII-DA Complexes at the Hanging Mercury Drop Electrode

Zhang

Cheng

et al. 2007

ANAL. SCI.

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“…Heavy Metal Monitoring at Solid/Solution Interfaces measured at the tip and the distance from the source of the electroactive species [27,41], the subsequent current decrease as the microtip is moved further is, apparently, not consistent with the above view of the metal ion flux direction.…”

Section: Asv-secm Evaluation Of Spatial Ion Mobility and Time Evolutionmentioning

confidence: 99%

Application of Sphere Cap Mercury Microelectrodes and Scanning Electrochemical Microscopy (SECM) for Heavy Metal Monitoring at Solid/Solution Interfaces

et al. 2007

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In this paper, a combination of anodic stripping voltammetry (ASV) at mercury microelectrodes and scanning electrochemical microscopy (SECM) was employed to establish the concentration profiles of heavy metal ions at the soil/water interface of a natural sediment and bauxitic-soil sample. Air dried soil samples were equilibrated with aqueous solutions containing 0.5 M NaCl plus acetate buffers or HClO 4 at different concentrations to allow the achievement of different pH either in the aqueous phase or in the soil slurry. It was verified that mixing acidified aqueous solution and the soil without stirring led to concentration profiles displaying a maximum at the water/soil interface. This was explained as due to pH gradients that originated at the soil/water interface and within the soil slurries. On the other hand, mixing the soils and water solutions, under stirring for 24 -48 h, provided almost uniform pH throughout the system. This allowed obtaining uniform metal ion concentrations within the soil slurries. For the evaluation of the concentrations, the anodic charge involved in the stripping step was utilized. The mercury microelectrode was standardized in a 0.5 M NaCl aqueous solution by performing calibration plots over the concentration range 0.1 -500 mM. To evaluate the concentrations of the metal ions in the soil slurries, a procedure was developed to obtain the apparent diffusion coefficients of the metal ions, which depended on the physical properties of the soil such as porosity and tortuosity. The microanalytical methodology proposed here can be utilized for predicting the mobilization of trace elements from soils that comes into contact with acid rain.

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“…For more complex situations, solutions of the partial differential equations have been obtained [114,115].…”

Section: Theory Of the Generation-collection Modementioning

confidence: 99%

Investigation of Localized Catalytic and Electrocatalytic Processes and Corrosion Reactions with Scanning Electrochemical Microscopy (SECM)

Pust¹,

Maier²,

Wittstock³

2008

Zeitschrift Für Physikalische Chemie

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Scanning Electrochemical Microscopy (SECM) . Catalytic Electrodes .Electrochemical Energy Conversion . Fuel Cells . Oxygen Reduction Reaction . CorrosionScanning electrochemical microscopy (SECM) has developed into a very versatile tool for the investigation of solid-liquid, liquid-liquid and liquid-gas interfaces. The arrangement of an ultramicroelectrode (UME) in close proximity to the interface under study allows the application of a large variety of different experimental schemes. The most important have been named feedback mode, generation-collection mode, redox competition mode and direct mode. Quantitative descriptions are available for the UME signal, depending on different sample properties and experimental variables. Therefore, SECM has been established as an indispensible tool in many areas of fundamental electrochemical research. Currently, it also spreads as an important new method to solve more applied problems, in which inhomogeneous current distributions are typically observed on different length scales. Prominent examples include devices for electrochemical energy conversion such as fuel cells and batteries as well as localized corrosion phenomena. However, the direct local investigation of such systems is often impossible. Instead, suitable reaction schemes, sample environments, model samples and even new operation modes have to be introduced in order to obtain results that are relevant to the practical application. This review outlines and compares the theoretical basis of the different SECM working modes and reviews the application in the area of electrochemical energy conversion and localized

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Detection of Tl(I) Transport through a Gramicidin−Dioleoylphosphatidylcholine Monolayer Using the Substrate Generation−Tip Collection Mode of Scanning Electrochemical Microscopy

Cited by 42 publications

References 40 publications

Direct Voltammetric Specific Recognition of Dopamine Using AlIII-DA Complexes at the Hanging Mercury Drop Electrode

Direct Voltammetric Specific Recognition of Dopamine Using AlIII-DA Complexes at the Hanging Mercury Drop Electrode

Application of Sphere Cap Mercury Microelectrodes and Scanning Electrochemical Microscopy (SECM) for Heavy Metal Monitoring at Solid/Solution Interfaces

Investigation of Localized Catalytic and Electrocatalytic Processes and Corrosion Reactions with Scanning Electrochemical Microscopy (SECM)

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