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Simple and Sensitive Voltammetric Determination of Esculetin Using Electrochemically Reduced Graphene Oxide Modified Electrode
Author(s) -
Li Yinfeng,
Li Ying,
Li Kunjing,
Ye Baoxian
Publication year - 2015
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201400326
Subject(s) - graphene , chemistry , dielectric spectroscopy , oxide , cyclic voltammetry , detection limit , electrochemical gas sensor , electrode , electrochemistry , voltammetry , analytical chemistry (journal) , nanotechnology , chromatography , materials science , organic chemistry
A simple and sensitive voltammetric sensor for esculetin, based on electrochemically reduced graphene oxide film modified glassy carbon electrode, was reported for the quantitative determination of esculetin in the Chinese traditional herbal drug Viola yedoensis Makino. Electrochemical impedance spectroscopy and scanning electron microscopy were employed to study the characteristic of the graphene oxide film. The electrochemical behavior of esculetin on this sensor was investigated in pH 3.0 phosphate buffer solution by cyclic voltammetry. Significant advantages were achieved by the excellent conductivity and the high surface‐to‐volume ratio of electrochemically reduced graphene oxide. A calibration plot of oxidation peak currents versus esculetin concentrations was linear in the range of 4.0 ξ 10 ‐8 mol L ‐1 to 5.0 ξ 10 ‐6 mol L ‐1 with a detection limit of 2.0 ξ 10 ‐8 mol L ‐1 . The practical application of the present sensor was demonstrated by determining the concentration of esculetin in real sample with no interference.