Characteristics of ${\alpha}$-Cyclodextrin Modified Carbon Paste Electrode

${\alpha}$-Cyclodextrin으로 화학수식된 Carbon Paste 전극의 특성

  • Received : 1996.04.25
  • Published : 1996.09.25

Abstract

A carbon paste electrode were chemically modified using ${\alpha}$-cyclodextrin. Characteristics of chemically modified carbon paste electrodes were studied on the basis of the inclusion complex formation of ${\alpha}$-cyclodextrin and p-nitrophenol in solution. Cyclic voltammetry and differential pulse voltammetry were used to monitor the efficiency of the chemical modification. When the ${\alpha}$-cyclodextrin and carbon powder ratio of 2 : 1 in weight were used, the reduction peak current of p-nitrophenol was decreased almost completely, whereas those of o-nitrophenol and hydroquinone were not changed much. This result is due to the large difference in the inclusion complex formation constants of p-nitrophenol and the other probes with ${\alpha}$-cyclodextrin. Taking advantage of this difference, we can determine the concentration of o-nitrophenol even in the presence of p-nitrophenol.

Keywords

${\alpha}$-cyclodextrin;carbon paste electrode;chemically modified electrode;p-ni trophenol;o-ni trophenol;hydroquinone

Acknowledgement

Supported by : 한국과학재단