scholarly journals Membrane-entrapped microperoxidase as a ‘solid-state’ promoter in the electrochemistry of soluble metalloproteins

1989 ◽  
Vol 264 (1) ◽  
pp. 301-304 ◽  
Author(s):  
M Brunori ◽  
R Santucci ◽  
L Campanella ◽  
G Tranchida
Keyword(s):  
Solid State ◽  
Cytochrome C ◽  
Electrochemical Behaviour ◽  
Cellulose Triacetate ◽  
Electrochemical Process ◽  
Carbon Electrode ◽  
Diffusion Controlled ◽  
Reversible Electron Transfer ◽  
Solid Matrices ◽  
The Many

Immobilization of biological systems in solid matrices is presently of great interest, in view of the many potential advantages associated with both the higher stability of the immobilized macromolecules and the potential utilization for biotechnology. In the present paper the electrochemical behaviour of the undecapeptide from cytochrome c (called microperoxidase) tightly entrapped in cellulose triacetate membrane is reported; its utilization as ‘solid-state’ promoter in the electrochemistry of soluble metalloproteins is presented. The results obtained indicate that: (i) membrane-entrapped microperoxidase undergoes rapid reversible electron transfer at a glassy carbon electrode; (ii) the electrochemical process is diffusion-controlled; (iii) entrapped microperoxidase acts as ‘solid-state’ promoter in the electrochemistry of soluble cytochrome c and of azurin.

scholarly journals Use of ‘solid-state’ promoters in the electrochemistry of cytochrome c at a gold electrode

1991 ◽  
Vol 273 (3) ◽  
pp. 783-786 ◽  
Author(s):  
R Santucci ◽  
A Faraoni ◽  
L Campanella ◽  
G Tranchida ◽  
M Brunori
Keyword(s):  
Cyclic Voltammetry ◽  
Solid State ◽  
Cytochrome C ◽  
Gold Electrode ◽  
Direct Electrochemistry ◽  
Protoporphyrin Ix ◽  
Cellulose Triacetate ◽  
Electrode Surfaces ◽  
Inert Electrode ◽  
Hydrolysis Of

The direct electrochemistry of cytochrome c at a gold electrode was investigated by cyclic voltammetry using, as promoters, microperoxidase (the haem-undecapeptide obtained by hydrolysis of cytochrome c), Fe(III)-protoporphyrin IX or protoporphyrin-IX, all entrapped in a cellulose triacetate membrane. The results indicate that these immobilized systems strongly enhance the rate of electron transfer between the protein in solution and the electrode surface, and thus behave as ‘solid-state’ promoters, though with differing efficiencies. These results are of interest because they raise the possibility of engineering an efficient and versatile promoter active also at inert electrode surfaces.

scholarly journals Electrochemical Behaviour of Dihydroxybenzene Isomers at Glassy Carbon Electrode in Different Electrolytic Media

2015 ◽  
Vol 39 (2) ◽  
pp. 135-146
Author(s):  
Md Toufiqur Rahman ◽  
Md Uzzal Hossain ◽  
MQ Ehsan
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Phosphate Buffer ◽  
Electrochemical Behaviour ◽  
Electrochemical Process ◽  
Carbon Electrode ◽  
Linear Relationships ◽  
Electrocatalytic Effect ◽  
Academy Of Sciences

Electrochemical behaviour of catechol, hydroquinone and resorcinol was investigated in KCl, acetate buffer and phosphate buffer at glassy carbon electrod using cyclic voltammetry. The results imply that the glassy carbon electrode exhibited a synergistic and excellent electrocatalytic effect on the redox behaviors of the benzenediols. Catechol and hydroquinone show one pair of redox peaks in acetate and phosphate buffer but two pairs of redox peaks in KCl. In all cases the redox process is quasireversible. Resorcinol behaves almost irreversibly in all three electrolytic media. Good linear relationships were obtained between the peak currents and the concentrations of benzenediols. The electrochemical process in all the isomers was controlled by diffusion process.Journal of Bangladesh Academy of Sciences, Vol. 39, No. 2, 135-146, 2015

A Dual-Wavelength Electrochromic Film Based on Pt(II) Complex for Optical Modulation at Telecommunication Wavelength and Dark Solid-State Display Device

2021 ◽  
Author(s):  
Qiaozhen Pi ◽  
Dongqin Bi ◽  
dongfang qiu ◽  
Hongwei Wang ◽  
Xinfeng Cheng ◽  
...  
Keyword(s):  
Solid State ◽  
Dual Wavelength ◽  
Optical Modulation ◽  
Display Device ◽  
Redox Behaviour ◽  
Diffusion Controlled ◽  
Telecommunication Wavelength

A cyclometalated platinum phenylacetylide [(L)Pt(C≡C-ph)] {L = 4-[p-(diphenylamino)phenyl]-6-phenyl-2,2’-bipyridine} has been successfully synthesized and characterized. And its oxidative electropolymerization film with a non-diffusion controlled redox behaviour and an inverse dependence of...

13C NMR study of cellulose triacetate in the solid state

1987 ◽  
Vol 25 (3) ◽  
pp. 121-126 ◽  
Author(s):  
Mitsuo Takai ◽  
Keiji Fukuda ◽  
Jisuke Hayashi
Keyword(s):  
Solid State ◽  
13C Nmr ◽  
Cellulose Triacetate ◽  
Nmr Study

Joining of Ti3SiC2 with Ti–6Al–4V Alloy

2002 ◽  
Vol 17 (1) ◽  
pp. 52-59 ◽  
Author(s):  
N.F. Gao ◽  
Y. Miyamoto
Keyword(s):  
Solid State ◽  
Rate Constant ◽  
Liquid State ◽  
Parabolic Rate Constant ◽  
Diffusion Path ◽  
Solid State Diffusion ◽  
Diffusion Controlled ◽  
State Diffusion ◽  
Rate Controlled ◽  
Higher Temperature

The joining of a Ti3SiC2 ceramic with a Ti–6Al–4V alloy was carried out at the temperature range of 1200–1400 °C for 15 min to 4 h in a vacuum. The total diffusion path of joining was determined to be Ti3SiC2/Ti5Si3Cx/Ti5Si3Cx + TiCx/TiCx/Ti. The reaction was rate controlled by the solid-state diffusion below 1350 °C and turned to the liquid-state diffusion controlled with a dramatic increase of parabolic rate constant Kp when the temperature exceeded 1350 °C. The TiCx tended to grow at the boundarywith the Ti–6Al–4V alloy at a higher temperature and longer holding time. TheTi3SiC2/Ti–6Al–4V joint is expected to be applied to implant materials.

Reversible Electron Transfer Coupled to Spin Crossover in an Iron Coordination Salt in the Solid State

2008 ◽  
Vol 120 (7) ◽  
pp. 1248-1251 ◽  
Author(s):  
Marat M. Khusniyarov ◽  
Thomas Weyhermüller ◽  
Eckhard Bill ◽  
Karl Wieghardt
Keyword(s):  
Electron Transfer ◽  
Solid State ◽  
Spin Crossover ◽  
Reversible Electron Transfer ◽  
Iron Coordination

scholarly journals Electrochemical Behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones

2012 ◽  
Vol 9 (4) ◽  
pp. 1864-1874
Author(s):  
V. Nagaraju ◽  
R. Sreenivasulu ◽  
P. Venkata Ramana
Keyword(s):  
Electrochemical Behaviour ◽  
Reduction Process ◽  
Effect Of Solvent ◽  
Buffer Solutions ◽  
Diffusion Controlled ◽  
Controlled Potential Electrolysis ◽  
Dc Polarography ◽  
Controlled Potential ◽  
Ph Range ◽  
And Diffusion

The electrochemical behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones has been investigated at dme and gc electrodes in buffer solutions of pH 2.0, 4.0, 6.0, 8.0 and 10.0 using dc polarography and cyclic voltammetry and coulometry. The compounds exhibit one well defined wave in the entire pH range of study. The process is irreversible and diffusion controlled. Controlled potential electrolysis indicates the involvement of four electrons in the reduction process. The effect of solvent, cations and anions, temperature and substitutents on the mechanism of reduction has been studied. Based on the results obtained the mechanism of reduction has been suggested.

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