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  • 1
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 21 (1982), S. 1781-1791 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of cytochrome c on the redox behavior of 1,4-benzoquinone and cystine has been investigated by differential pulse polarography. The adsorption of cytochrome c on mercury surface produces a lowering of the reduction peak of 1,4-benzoquinone and of the cystine prepeak. When the covering of the drop is maximal, no variation in peak height is observed. By using the Koryta equation, values between 1500 and 2300 Å2 for the surface area of one adsorbed cytochrome c molecule were obtained. The capacitance dependences on concentration and time have been determined by alternating-current polarography, and lead to the surface area values of 2800 and 2700 Å2, respectively. Results are interpreted on the basis of an unfolding of cytochrome c molecules during the adsorption process. It is likely that a rather compact covering is obtained, but about 10% of the mercury surface seems to be unoccupied and corresponds to the accessible interstices between adjacent molecules.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 415-422 
    ISSN: 1040-0397
    Keywords: Modified electrodes ; Nafion ; Cytochrome c3 ; Ferredoxin ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several redox proteins are studied at Nafion-coated pyrolytic graphite (PG) electrodes. The electrochemical behavior of polyheme c-type cytochromes and spinach ferredoxin is described using cyclic and square-wave voltammetry (SWV). No signals are detected when Nafion-coated electrodes are exposed to the protein solutions. In contrast, electrochemical responses are observed when droplets of protein solutions, deposited on the PG surface are dried then entrapped in Nafion layer. These Nafion-modified electrodes permit one to detect very small amounts (1 μg) of cytochrome c3. The stability of entrapped molecules upon repetitive cycling has been investigated. Such modified electrodes offer new perspectives for studying proteins confined at electrode surfaces.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 307-310 
    ISSN: 1040-0397
    Keywords: Cytochrome c ; Microelectrode array ; Proteins ; Poly(ester sulfonic acid) ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel microelectrode assembly containing more than 1000 carbon microdisks has been used to study the interfacial electron transfer kinetics of cytochrome c and several other redox proteins. It is demonstrated that near-steady-state current-voltage curves can be obtained without solution stirring, and without significant mains interference or capacitive charging currents. In addition, it is demonstrated that concentrations of redox proteins as low as 1 μM can be detected in solution. Finally, it is shown that the surfaces of carbon microdisk assemblies can be successfully coated with thin films of poly(ester sulfonic acid), which allows reactants to be studied in a membrane-like environment.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 190-194 
    ISSN: 1040-0397
    Keywords: Organic salt electrodes ; Cytochrome c ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrodes made from pastes of the conducting organic salt, tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ), are prepared and characterized using electrochemical techniques. These electrodes behave as conventional solid electrodes within their stable potential range. An attractive property is their capability to achieve direct electrochemistry of c-type cytochromes (horse heart cytochrome c, cytochrome c552 from Thiobacillus ferrooxidans). Resuits on pH-dependence and kinetic data for these metalloproteins agree with previously published data. It is suggested that favorable interactions occur between the TTF-TCNQ electrode surface and redox protein sites. Moreover, the analytical advantage of using permselective-membrane TTF-TCNQ electrode is demonstrated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 67-74 
    ISSN: 1040-0397
    Keywords: Modified electrodes ; Poly(L-lysine) ; Hexacyanoferrate ; Ferredoxin ; Hydrogenase ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pyrolytic graphite electrodes are coated with films of poly(L-lysine) (PLL). The polyelectrolyte films bind multiply charged counterions. Cyclic voltammetry is used to investigate the incorporation of Fe(CN)63- anions as a function of time, concentration, pH, and ionic strength. The stability of the film is studied after transfer of the PLL coatings into an electrolyte solution. The PLL-modified pyrolytic graphite (PG) electrode proves to be very effective in facilitating electron transfers of negatively charged proteins, such as ferredoxin and hydrogenase.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 442-446 
    ISSN: 1040-0397
    Keywords: Lipid ; Modified electrodes ; Ferredoxin ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pyrolytic graphite (PG) electrodes are coated with films of dodecylamine (DDA), dimethyldioctadecylammonium bromide (DODAB) or composite layers based on a mixture of phosphatidylcholine (PC) and cholesterol (CH). Cyclic voltammetry is used to investigate the incorporation of two negatively charged species, Fe(CN)63- and spinach ferredoxin, into the DDA or DODAB layers, as a function of time and composition of the cast films. No signal corresponding to the spinach ferredoxin redox reaction is detected at the PG electrode simply coated with a mixed (PC-CH) layer. Well-shaped responses denoting redox reaction of ferredoxin are observed when the (PC-CH) layer is doped with DDA (or DODAB). The results support the electrostatic nature of the interactions between negatively charged species and the positive charges in the lipid layer.Such coated electrodes seem well-suited for studying negatively charged species. They provide a good model for mimicking physiological redox protein-membrane interactions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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