dsDNA modified carbon nanofiber-solidified paste electrodes: probing Ni(II)-dsDNA interactions
Ferancova, A., Rassaei, L., Marken, F., Labuda, J. and Sillanpaa, M., 2010. dsDNA modified carbon nanofiber-solidified paste electrodes: probing Ni(II)-dsDNA interactions. Microchimica Acta, 170 (1-2), pp. 155-164.
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In order to develop a renewable electrode surface, carbon nanofibers (CNF) were embedded into solidified paste electrodes using a composite of paraffin wax and paraffin oil. A range of different compositions was surveyed and the optimal composition of the paste for electroanalysis was found to be 43% of CNF, 41% of paraffin wax, and 16% of paraffin oil. The electrochemical properties of the novel composite electrode were investigated using cyclic voltammetry and electrochemical impedance spectroscopy and compared to those of similar graphite-solidified paste electrodes. The carbon nanofibers enhance the activity of the surface of the electrode and provide a good substrate for the adsorption and voltammetric detection of dsDNA. Responses of dsDNA bases and Ni2+ ions accumulated from ammonium buffer pH 8.5 (with a Langmuirian binding constant of 10(5) mol(-1) L) were investigated and a limit of detection of 7 nmol L-1 (at 3 sigma) was obtained using "nucleation stripping voltammetry". Interferences by other metal cations are examined and discussed.
|Creators||Ferancova, A., Rassaei, L., Marken, F., Labuda, J. and Sillanpaa, M.|
|Uncontrolled Keywords||solidified paste electrode, dna biosensor, nucleation stripping voltammetry, carbon nanofibers, nickel-dna interaction|
|Departments||Faculty of Science > Chemistry|
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