Electrocatalytic and Analytical Response of β-Cyclodextrin Incorporated Carbon Nanotubes-Modified Electrodes Toward Guanine

Abstract

The utility of b-cyclodextrin incorporated carbon nanotubes-modified electrodes (b-CD/CNT/E) for electrocatalytic oxidation of guanine in aqueous solution is demonstrated. Compared to the conventional electrode, it lowers the overpotential and enhances the peak current significantly. The action mechanism of b-CD/CNT/E was discussed systemically. The results demonstrated that the use of b-CD/CNT/E clearly provides an effective methodology for the determination of guanine. Based on the signal of guanine, an estimate of DNA concentration can be recognized with a limit of detection of 10 ng mL À1.

Direct electrocatalytic and simultaneous determination of purine and pyrimidine DNA bases using novel mesoporous carbon fibers as electrocatalyst

“…Therefore, electrochemical techniques have become an important tool to investigate the direct electrochemistry of DNA bases. The electrocatalytic oxidation of purine bases with different modified electrodes has been reported [9][10][11], however, the electrochemical detection of pyrimidine bases is rarely reported because of their high oxidation potentials and slow electron transfer kinetics [12]. Therefore, simultaneous electrochemical detection of purine and pyrimidine bases is of great difficulty.…”

Wet Adsorption of a Luminescent EuIII complex on Carbon Nanotubes Sidewalls

“…Therefore, functionalization of CNTs with organic groups, which can enhance both the solubility in organic solvents and the number of reactive sites for post-integration into multicomponent organic materials, revealed to be the best approach to render these materials processable. [8][9][10][11] The main chemical approaches for the modification of CNTs are grouped into two categories: [12] i) non-covalent (or supramolecular) [13][14][15][16][17] and ii) covalent [8,[18][19][20] functionalization. While the supramolecular approach does not lead to a structural modification of the carbon framework, the covalent derivatization often leads to profound structural (and consequently electronic) alterations as a consequence of the change in the carbon hybridization.…”

DNA Biosensors Based on Nanostructured Materials

“…In addition, a DNA recognition process was also reported. The modified graphite electrode was prepared by casting the mixture of MWNTs and b-CD onto the surface and evaporating to dryness [86,87]. The sensor was then applied to determine free guanine and adenine levels.…”