8/2013-14 Sensing in Electroanalysis
Permanentní URI k tomuto záznamuhttps://hdl.handle.net/10195/56677
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Článekpeer-reviewedpublished Otevřený přístup Electrochemical sensor for histamine determination based on zinc oxide thin films electrodeposited on carbon paste electrodes(Univerzita Pardubice, 2014) Pekec, Bruna; Hauser, Susanne; Kalcher, Kurt; Ortner, AstridHistamine, a biogenic amine and important mediator of inflammation was quantitatively analysed using electrochemical techniques. The sensor designed in this context based on carbon paste (CP) as electrode material and zinc oxide (ZnO) as modifier to increase the selectivity, due to the strong complex building tendency of the imidazole ring to metals. Using an alkaline electrolyte medium the oxidation potential was shifted from + 1.20 V in neutral medium to a less positive value of + 0.750 V vs. Ag/AgCl. A logarithmic correlation for a concentration range from 5 to 500 μg/mL could be found. The developed ZnO-CP based sensor, characterized by a precision (R.S.D.) of 5.8 % and an accuracy of 5.2 % was successfully tested in complex food matrix.Článekpeer-reviewedpublished Otevřený přístup Carbon paste electrodes bulk-modified with carbon nanotubes and chemically oxidized carbon nanotubes for the determination of hydrogen peroxide(Univerzita Pardubice, 2014) Zbiljić, Jasmina; Vajdle, Olga; Guzsvány, Valéria; Kónya, Zoltán; Kukovecz, Ákos; Dalmacija, Božo; Kalcher, KurtCarbon paste electrodes (graphite/paraffin oil) bulk-modified with multiwalled carbon nanotubes (MWCNT) and chemically oxidized MWCNT (O-MWCNT) were used as sensors for the hydrodynamic chronoamperometric determination of hydrogen peroxide (H2O2). Experimental parameters, such as the type and pH of the supporting electrolyte or the working potential(s) applied were investigated in the batch arrangement.Článekpeer-reviewedpublished Otevřený přístup Traditional vs. non-traditional materials for carbon paste electrode preparation: on relation between the composition and properties(Univerzita Pardubice, 2014) Mikysek, Tomáš; Rosecká, Kamila; Stočes, Matěj; Kalcher, Kurt; Švancara, IvanSeveral new types of carbon pastes were prepared as well as pastes made from various abrasive materials, examined and characterized. The main attention has been paid to the changes in their ohmic resistance, relative to the dependence on the composition of powder material to paraffin oil as pasting liquid. The results were compared with those of “traditional” carbon paste electrodes based on graphite powder and the differences in physical as well as electrochemical properties were discussed and explained. As found, the most evident difference was in the optimal carbon-to-binder ratio of the paste.