Abstract
A nanostructured film electrode, a multi-wall carbon nanotubes (MWNT)-modified glassy carbon electrode (GCE), is described for the simultaneous determination of guanine and adenine. The properties of the MWNT-modified GCE were investigated by scanning electron microscopy (SEM) and cyclic voltammetry. The oxidation peak currents of guanine and adenine increased significantly at the MWNT-modified GCE in contrast to those at the bare GCE. The experimental parameters were optimized and a direct electrochemical method for the simultaneous determination of guanine and adenine was proposed. Using the MWNT-modified GCE, a sensitive and direct electrochemical technique for the measurement of native DNA was also developed, and the value of (G+C)/(A+T) of HCl-digested DNA was detected.
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Abbreviations
- MWNT:
-
Multi-wall carbon nanotubes
- G:
-
Guanine
- A:
-
Adenine
- GCE:
-
Glassy carbon electrode
- DHP:
-
Dihexadecyl hydrogen phosphate
- SEM:
-
Scanning electron microscope
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The authors are grateful for financial support from the National Science Foundation of China (No.60171023).
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Wu, K., Fei, J., Bai, W. et al. Direct electrochemistry of DNA, guanine and adenine at a nanostructured film-modified electrode. Anal Bioanal Chem 376, 205–209 (2003). https://doi.org/10.1007/s00216-003-1887-0
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DOI: https://doi.org/10.1007/s00216-003-1887-0