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  • 1
    Electronic Resource
    Electronic Resource
    Copper wire amperometric detector for capillary electrophoresis (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 141-145 
    Details
    ISSN: 1040-7685
    Keywords: capillary electrophoresis ; copper electrode detection ; amino acids ; catecholamines ; peptides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220030207
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning electrochemical detection in capillary electrophoresis (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 6 (1994), S. 263-268 
    Details
    ISSN: 1040-7685
    Keywords: capillary electrophoresis ; scanning electrochemical detection ; voltammetric detection ; catecholamines ; peptides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220060311
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Electrochemical oxidation of 5-hydroxytryptamine and 5-hydroxyindoleacetic acid by integrated pulse linear scan voltammetry at ultrasmall gold ring electrodes (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 865-869 
    Details
    ISSN: 1040-0397
    Keywords: Ring Microelectrode ; 5-Hydroxytrypton ; Voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ultrasmall gold ring electrodes have been constructed by electrodeposition of gold onto carbon ring electrodes. Electrodes thus formed show similar adsorption/desorption peaks for oxygen in H2SO4 solution compared to those obtained at conventional-sized electrodes. These electrodes have been used in conjunction with linear scan voltammetry and subsequent cleaning pulses to obtain repeatable quantitative results for the electochemical oxidation of 5-hydroxytrptamine and 5-hydroxyindoleacetic acid. This technique involves the use of a linearly scanned applied potential, followed by a large positive potential to clean the electrode oxidatively and negative potential for electrode activation. The result of the cleaning pulses is that oxidation products of 5-hydroxytryptamine are cleaned off the electrode and reproducible voltammograms are obtained.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040907
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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