Voltammetry Dotaz Zobrazit nápovědu

Přesná shoda Sémantické

Electrochemical detection of quantum dots (QDs) has already been used in numerous applications. However, QDs have not been well characterized using voltammetry, with respect to their characterization and quantification. Therefore, the main aim was to characterize CdTe QDs using cyclic and differential pulse voltammetry. The obtained peaks were identified and the detection limit (3 S/N) was estimated down to 100 fg/mL. Based on the convincing results, a new method for how to study stability and quantify the dots was suggested. Thus, the approach was further utilized for the testing of QDs stability.

Publikační typ
časopisecké články MeSH

Článek online

Stanovenie stopových koncentrácií arzénu elektrochemickou rozpúšťacou analýzou
[Determination of trace concentrations of arsenic by stripping voltammetry]
[The determination of trace concentrations of arsenic by stripping voltammetry]

Chemické listy. 2000 ; Roč. 94 (č. 3) : s. 159-167.

ISSN 0009-2770
Medvik
Zdroj

Článek online

Cyclic voltammetry of dna at a mercury electrode: an anodic pea specific for guanine

General physiology and biophysics. 1986 ; Roč. 5 (č. 3) : S. 315-329.

ISSN 0231-5882
Medvik
Zdroj

Článek

Voltammetry of hypoxic cells radiosensitizer etanidazole radical anion in water

Bioelectrochemistry. 2010 ; 78 (2) : 118-123.

ISSN 1878-562X
Medvik
Zdroj

Cytotoxic properties of radiosensitizers are due to the fact that, in the metabolic pathway, these compounds undergo one-electron reduction to generate radical anions. In this study we focused our interest on the electrochemical transfer of the first electron on radiosensitizer Etanidazole (ETN) and, consequently, on the ETN radical-anion formation in the buffered aqueous media. ETN was electrochemically treated in the broad pH range at various scan rates. Three reduction peaks and one oxidation peak were found. At strong alkaline pH the four-electron reduction peak was separated into one-electron and three-electron reductions. Under these conditions the standard rate constant k(0) for the redox couple ETN-NO(2)+e(-) <--> ETN-NO(2)(*-) was calculated. Moreover, the value of a so called E(7)(1) potential that accounts for the energy necessary to transfer the first electron to an electroactive group at pH=7 in aqueous medium to form a radical anion was also determined. The obtained value of E(7)(1) indicates that lower energy compared to the other possible chemical radiosensitizers is necessary for the system to transfer the first electron to ETN. On the other hand, the necessity of the strong alkaline pH may decrease the ability of ETN to act as hypoxic radiosensitizer in the human body.