▪ Abstract Proton-coupled electron transfer (PCET) is an important mechanism for charge transfer in a wide variety of systems including biology- and materials-oriented venues. We review several are...

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Proton-Coupled Electron Transfer

Potential applications of enzymes immobilized on/in nano materials: A review

Due to the significance of hydrogen peroxide (H(2)O(2)) in biological systems and its practical applications, the development of efficient electrochemical H(2)O(2) sensors holds a special attraction for researchers Various materials such as Prussian blue (PB), heme proteins, carbon nanotubes (CNTs) and transition metals have been applied to the construction of H(2)O(2) sensors In this article, the electrocatalytic H(2)O(2) determinations are mainly focused on because they can provide a superior sensing performance over non-electrocatalytic ones The synergetic effect between nanotechnology and electrochemical H(2)O(2) determination is also highlighted in various aspects In addition, some recent progress for in vivo H(2)O(2) measurements is also presented Finally, the future prospects for more efficient H(2)O(2) sensing are discussed

Recent advances in electrochemical sensing for hydrogen peroxide: a review

Most of the metal ions are carcinogens and lead to serious health concerns by producing free radicals. Hence, fast and accurate detection of metal ions has become a critical issue. Among various metal ions arsenic, cadmium, lead, mercury and chromium are considered to be highly toxic. To detect these metal ions, electrochemical biosensors with interfaces such as microorganisms, enzymes, microspheres, nanomaterials like gold, silver nanoparticles, CNTs, and metal oxides have been developed. Among these, nanomaterials are considered to be most promising, owing to their strong adsorption, fast electron transfer kinetics, and biocompatibility, which are very apt for biosensing applications. The coupling of electrochemical techniques with nanomaterials has enhanced the sensitivity, limit of detection, and robustness of the sensors. In this review, toxicity mechanisms of various metal ions and their relationship towards the induction of oxidative stress have been summarized. Also, electrochemical biosensors employed in the detection of metal ions with various interfaces have been highlighted.

A review on detection of heavy metal ions in water – An electrochemical approach

This review regards the use of dynamic electrochemistry to study the mechanism of redox enzymes, with exclusive emphasis on the configuration where the protein is adsorbed onto an electrode and electron tranfer is direct.

https://hal.archives-ouvertes.fr/hal-01211439/document

Direct Electrochemistry of Redox Enzymes as a Tool for Mechanistic Studies

Nanomolar detection of hydrogen peroxide on glassy carbon electrode modified with electrodeposited cobalt oxide nanoparticles.

Immobilization of glucose oxidase on electrodeposited nickel oxide nanoparticles: Direct electron transfer and electrocatalytic activity

Novel cobalt oxide nanoparticles based sensor for the detection of trace amount of As3+ ion in aqueous solution has been developed. Cyclic voltammetry at potential range −1.1 to 1.1 V from aqueous buffer solution (pH 7) containing CoCl2 produced a well-defined cobalt oxide (CoOx) nanoparticles deposited on the surface of glassy carbon electrode. The resulting electrode surfaces and its morphology were examined with both cyclic voltammetry and scanning electron microscope (SEM) techniques. The modified electrode shows excellent catalytic activity toward arsenic oxidation at wide pH range, 5–11. The response to As3+ on the modified electrode was examined using cyclic voltammetry and hydrodynamic amperometry. The amperometric detection of arsenic is carried out at 0.75 V versus Ag/AgCl reference electrode in phosphate buffer solution with pH 7. The detection limit (S/N = 3) was 11 nM with linearity up to 4 orders of magnitude and sensitivity of 111.3 nA/μM. The response time of the electrode to achieve 95% of the steady-state current is

Saied Soltanian

Papers

Nanomolar detection of hydrogen peroxide on glassy carbon electrode modified with electrodeposited cobalt oxide nanoparticles.

Immobilization of glucose oxidase on electrodeposited nickel oxide nanoparticles: Direct electron transfer and electrocatalytic activity

Electrochemical detection of trace amount of arsenic(III) at glassy carbon electrode modified with cobalt oxide nanoparticles

Direct voltammetry and electrocatalytic properties of hemoglobin immobilized on a glassy carbon electrode modified with nickel oxide nanoparticles

Direct electrochemistry and electrocatalytic activity of catalase immobilized onto electrodeposited nano-scale islands of nickel oxide.