Trace analysis of ponceau 4R based on the signal amplification of copper-based metal-organic framework modified electrode
Journal of Electroanalytical Chemistry(2017)
摘要
It is quite important to research rapid and sensitive analytical method for ponceau 4R due to its adverse health effects. In this work, a kind of copper-based metal-organic frameworks were prepared using 1,3,5-Benzenetricarboxylic acid (H3BTC) as the ligand, and then used to construct a novel electrochemical sensing platform for ponceau 4R. The prepared Cu-BTC frameworks exhibit strong surface accumulation ability toward ponceau 4R, and then enhance the oxidation activity of ponceau 4R effectively. On the surface of Cu-BTC modified electrode, the oxidation signals of ponceau 4R are enhanced significantly, and consequently the detection sensitivity is obviously improved. The influences of pH value, modification amount of Cu-BTC and accumulation time were studied. As a result, a sensitive, rapid and convenient electrochemical method was developed for the determination of ponceau 4R. The linear range is from 1.25 to 500ngmL−1, and the detection limit is 0.65ngmL−1 (1.08nM). It was used in different drink samples, and the detected results consisted with the values of that obtained by high performance liquid chromatography.
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关键词
Cu-BTC frameworks,Modified electrodes,Electrochemical determination,Ponceau 4R,Signal enhancement
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