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Digitale Medien

Copper wire amperometric detector for capillary electrophoresis (1991)

Engstrom-Silverman, Charlotte E. ; Ewing, Andrew G.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Microcolumn Separations 3 (1991), S. 141-145

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ISSN: 1040-7685

Schlagwort(e): capillary electrophoresis ; copper electrode detection ; amino acids ; catecholamines ; peptides ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The use of a copper wire amperometric detector for capillary electrophoresis is reported. Detection is accomplished by use of a porous glass joint, which allows amperometric detection at a copper wire electrode inserted in the end of the capillary. An anodic current is produced by a change in the copper oxide film solubility, resulting from complexation of copper ions with certain analytes at the electrode surface. This copper/copper oxide electrode has been used to detect nonelectroactive native amino acids and dipeptides. Subfemtomole detection limits in picoliter injection volumes have been obtained without solute derivatization. In addition, simultaneous analysis of nonelectroactive amino acids and electroactive catecholamines has been demonstrated.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mcs.1220030207

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Digitale Medien

Scanning electrochemical detection in capillary electrophoresis (1994)

Ferris, Sandra S. ; Lou, Guoan ; Ewing, Andrew G.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Microcolumn Separations 6 (1994), S. 263-268

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ISSN: 1040-7685

Schlagwort(e): capillary electrophoresis ; scanning electrochemical detection ; voltammetric detection ; catecholamines ; peptides ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Scanning electrochemical detection has been combined with capillary electrophoresis to increase the resolving power for closely eluting solutes. This detection mode has been characterized and provides voltammetric information for easily oxidized solutes with linear detection over concentrations in the 10-3 to 10-5 M range. Detection limits for catechols range from 360 amol to 740 amol (2.3 μM to 6.6 μM concentrations). Finally, two neutral solutes, catechol and tryptophan, co-elute under zone electrophoresis conditions, but are resolved with scanning detection.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mcs.1220060311

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Digitale Medien

Voltammetry of adenosine after electrochemical treatment of carbon-fiber electrodes (1994)

Chen, Ta K. ; Strein, Timothy G. ; Abe, Takayuki ; [weitere]

Weinheim : Wiley-Blackwell

Electroanalysis 6 (1994), S. 746-751

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ISSN: 1040-0397

Schlagwort(e): Electrochemical treatment ; Adenosine ; Carbon fiber ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Voltammetry of adenosine after electrochemical treatment is explored. The activations scheme includes an anodic potential (+2.2 V) for 125 ms and a cathodic potential (-1.0 V) for 75 ms. Subsequent staircase voltammetry can be used to obtain both qualitative and quantitative information. This activation procedure has been applied to 11 μm carbon-fiber microelectrodes to obtain reproducible voltammograms for adenosine. To characterize this activation procedure, the effect of the magnitude and duration of both the anodic and the cathodic potentials have been studied. Data obtained suggest that the magnitude of the applied potential pulse is critical to proper electrode activation, whereas duration and total charge passed have minimal effects.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/elan.1140060906

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Digitale Medien

Critical review of recent developments in fluorescence detection for capillary electrophoresis (1997)

MacTaylor, Christine E. ; Ewing, Andrew G.

Weinheim : Wiley-Blackwell

Electrophoresis 18 (1997), S. 2279-2290

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ISSN: 0173-0835

Schlagwort(e): Capillary electrophoresis ; Fluorescence ; Microdialysis ; Channel electrophoresis ; Chip separations ; Chemistry ; Biochemistry and Biotechnology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Recent developments in capillary electrophoresis with fluorescence detection are reviewed. Instrumental advances have led to increased sensitivity and, therefore, a growing number of applications. Capillary electrophoresis has been coupled with various techniques to achieve multi-dimensional separations. Other advances have focused on temporal resolution when sampling from biological environments, increased sample throughput especially for DNA analysis, and fast separation times. New technologies including chip and channel electrophoretic separations with fluorescence detection are also discussed.

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/elps.1150181218

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