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  • Biosensors  (1)
  • Electrochemical kinetics  (1)
  • Enzyme electrodes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Electrical contact of redox enzyme layers associated with electrodes: Routes to amperometric biosensors (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 965-977 
    Details
    ISSN: 1040-0397
    Keywords: Bioelectronics ; Biosenzors ; Enzyme electrodes ; Enzyme monolayers ; Enzyme multilayers ; Reconstituted enzymes ; Electrically contacted enzyme electrodes ; Bioelectrocatalysis ; Amperometric biosensors ; NAD(P)+-dependent enzyme electrodes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tailoring of electrically contacted enzyme electrodes provides the grounds for bioelectronic and biosensor systems. Redox-enzymes organized onto electrodes as monolayer assemblies, and chemically functionalized by redox-relay groups, yield electrically contacted enzyme electrodes exhibiting bioelectrocatalytic features. The sensitivity of the enzyme electrode can be enhanced, or tuned, by the organization of multilayer enzyme electrodes and the application of rough metal supports. Enzyme electrodes of extremely efficient electrical communication with the electrode are generated by the reconstitution of apo-flavoenzymes onto relay-FAD monolayers associated with electrodes. The reconstitution process results in an aligned enzyme on the surface, and its effective electrical contact with the electrode yields selective enzyme electrodes of unprecedented high current responses. Integrated electrodes consisting of relay-NAD(P)+-cofactor and enzyme units are generated by the reconstitution of NAD(P)+-dependent enzymes onto a relay-NAD(P)+ monolayer assembly followed by lateral crosslinking of the enzyme network.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140091302
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal and photochemical control of an electrochemical process at an isomerizable spiropyran monolayer-modified Au electrode (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 417-419 
    Details
    ISSN: 1040-0397
    Keywords: Switchable electrode ; Thermal effects ; Electrochemical kinetics ; Spiropyran monolayers ; Pyrroloquinolino quinone ; Isomerizable monolayer electrodes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An isomerizable monolayer-modified electrode is used to control interfacial electron transfer by means of external signals. A spiropyran (SP) monolayer undergoes thermal isomerization to the positively charged merocyanine monolayer, MRH+, while the latter isomer monolayer is photoisomerized, λ 〉 475 nm, to the SP-monolayer state. Pyrroloquinolino quinone (PQQ) is used as redox component for probing the interfacial electron transfer. The MRH+-monolayer electrode attracts the negatively charged PQQ and effective electron transfer is attained. Upon photochemical isomerization to the SP-monolayer electrode, the interfacial electron transfer is inhibited. Reversible activation and deactivation of the interfacial electron transfer is accomplished by cyclic isomerization of the monolayer through the MRH+ and SP-states, respectively, using thermal and photochemical signals.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070503
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  • 3
    Electronic Resource
    Electronic Resource
    Toluidine blue covalently immobilized onto gold electrode surfaces: An electrocatalytic system for nadh oxidation (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 725-734 
    Details
    ISSN: 1040-0397
    Keywords: Biosensors ; Toluidine blue ; NADH ; Thiol monolayers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical behavior of toluidine blue in solution has been studied and found to be strongly dependent on the electrode surface nature. Monolayers of cystamine (C) or 3-mercaptopropionic acid (MP) chemisorbed onto gold electrode surfaces have been used as support for covalent attachment of toluidine blue (TOB) through its aromatic amino group in position 3 and the amino or carboxylic groups covering the elearode surface. After covalent attachment of TOB onto an MP monolayer, three different species remained stably attached to the electrode surface. Physically adsorbed TOB, which showed the same midpoint potential as in the solubilized state, E1/2 = -245 mV (Ag/AgCl); covalently attached TOB, whose midpoint potential was shifted toward 120 mV more positive potentials; and an unknown species, probably physically adsorbed TOB dimers, with a midpoint potential, E1/2 = +135 mV (Ag/AgCl).Toluidine blue modified electrodes started to oxidize catalytically NADH at -100 mV with an amperometric response dependent on the concentration of the substrate. An electrode fouling process was observed after successive additions of NADH leading to the loss of catalytic activity.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060903
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