Biography:

One of their most recent publications is A new simple voltammetric analysis of the kinetics of homogeneous reactions following the EC mechanism: oxidation of Cu(I) by hydrogen peroxide. Which was published in journal Journal of Electroanalytical Chemistry.

More information about Anna-Kaisa Kontturi research including statistics on their citations can be found on their Copernicus Academic profile page.

Anna-Kaisa Kontturi's Articles: (2)

A new simple voltammetric analysis of the kinetics of homogeneous reactions following the EC mechanism: oxidation of Cu(I) by hydrogen peroxide

AbstractA new method for the calculation of rate constants of homogeneous reactions following an electron transfer step (the so called EC or electrochemical-chemical mechanism) is presented. It is shown that the diffusion problem for cyclic voltammetry for an EC mechanism has an analytical solution for a fast electron transfer reaction and an irreversible subsequent homogeneous reaction, provided the concentration of electroactive species does not change considerably during the voltammetric scan. This condition corresponds to analysing the voltammogram for current densities far below the peak current density. It is shown that the rate constant can be easily derived from the sweep rate at which no current minimum is observed in the reverse sweep. The rate constant for the reaction between Cu(I) and H2O2 has been measured with this technique and a value of (75 ± 10) dm3 mol−1s−1 has been found.

Conformation and ion-binding of oligonucleotides

AbstractThe effective charge and the conformation of oligonucleotides may influence their pharmaceutical properties. Therefore, a method based on the convective diffusion process was used to measure both the diffusion coefficient and the effective charge number of four oligonucleotides with different chain lengths. Determinations were carried out at physiological ionic strength and at two temperatures, 20 and 40 °C. The results indicate that the longer oligonucleotides, i.e. number of nucleotides in the molecule from 15 to 30, are strongly ion-paired (75–80%) and the shorter oligonucleotide (seven nucleotides) is only ca. 50% ion-paired. The extent of ion-binding was not dependent on temperature. The conformation of the oligonucleotides appeared to be fairly compact in 0.15 M NaCl solution. The compact conformation and strong ion-pairing may influence the pharmacokinetics of oligonucleotides, possibly facilitating distribution into tissues.

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