Liu Guishen,Ma Yanhui,Hou Xiaodong,huang Yina,Chen Jianpeng,Zhan Guoqing,Li Chunya
1-[3-(N-Pyrrole)propyl]-3-[1-tert-butoxy-carbonylamino-propyl]imidazolium tetrafluoroborate ionic liquid was successfully synthesized and characterized. The ionic liquid was electrochemically polymerized onto a glassy carbon electrode surface using a multi-potential step technique. Morphology and electrochemical properties of the polymerized ionic liquid film electrode were studied with scanning electronic microscopy and electrochemical impedance spectroscopy. Using the polymerized ionic liquid film as a sensing platform, electrochemical behaviors of magnolol were investigated by voltammetry. Under optimal experimental conditions, the oxidation peak currents were linearly related to magnolol concentrations in the range from 5.0 × 10 −8 to 1.0 × 10 −5 mol L −1 . The detection limit calculated from the standard deviation of the intercept was 2.3 × 10 −7 mol L −1 . Practical application of the polymerized ionic liquid film electrode was demonstrated by determining magnolol in the traditional Chinese medicine. The result is consistent with that obtained using high performance liquid chromatography.
Polymerized ionic liquid film electrode fabricated with potential step technique and application in voltammetric sensing of magnolol
3-Decyl-1-(3-pyrrole-propyl)imidazolium tetrafluoroborate (DPIMBF4) ionic liquid was synthesized and characterized. DPIMBF4 ionic liquid not only possesses a pyrrole group that can be electrochemically polymerized onto a glassy carbon electrode surface by using a multipotential step technique, but it also contains a long carbon chain that can improve the stability of a polymerized ionic liquid film in an aqueous solution. X-ray photoelectron spectroscopy, scanning electron microscope, and electrochemical impedance spectroscopy were used to confirm the successful polymerization of the ionic liquid. Voltammetry was employed to investigate the electrochemical behaviors of an environmental estrogen, hexestrol, at the polymerized ionic liquid film electrode. Hexestrol presents an irreversible oxidation peak at the polymerized DPIMBF4 ionic liquid film electrode. Compared with the bare glassy carbon electrode, the oxidation peak of hexestrol increased significantly on the polymerized DPIMBF4 ionic liquid film electrode. The oxidation peak current was found to be linearly related to hexestrol concentration in the range of 5.0 × 10−9 to 1.0 × 10−5 mol L−1. The detection limit was calculated to be 1.25 × 10−9 mol L−1 (S/N = 3). Hexestrol in crucian meat was determined using the polymerized DPIMBF4 ionic liquid film electrode with good accuracy.
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