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Digitale Medien

Electrical contact of redox enzyme layers associated with electrodes: Routes to amperometric biosensors (1997)

Willner, Itamar ; Katz, Eugenii ; Willner, Bilha

Weinheim : Wiley-Blackwell

Electroanalysis 9 (1997), S. 965-977

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ISSN: 1040-0397

Schlagwort(e): 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

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Zusätzliches Material: 17 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/elan.1140091302

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Digitale Medien

Thermal and photochemical control of an electrochemical process at an isomerizable spiropyran monolayer-modified Au electrode (1995)

Katz, Eugenii ; Willner, Itamar

Weinheim : Wiley-Blackwell

Electroanalysis 7 (1995), S. 417-419

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ISSN: 1040-0397

Schlagwort(e): Switchable electrode ; Thermal effects ; Electrochemical kinetics ; Spiropyran monolayers ; Pyrroloquinolino quinone ; Isomerizable monolayer electrodes ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/elan.1140070503

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