Synthesis of 1-[3-(N-pyrrole)propyl]-3-[1-tert-butoxycarbonylamino-propyl]-imidazolium tetrafluoroborate ionic liquid for application in electrochemical sensing of magnolol

Abstract

1-[3-(N-Pyrrole)propyl]-3-[1-tert-butoxycarbonylamino-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.

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“…54 Vitamins are vital components and many studies have been conducted for detection of various vitamins. 53,56,69 Phenolic compounds which pollute the environment, [114][115][116] pesticides, 139 herbicides, 156 glucose, [89][90][91][92][93]153 hydrogen peroxide, 101,102,104,105,[109][110][111][112] immunoglobulins, 119,120 plant components, 130,131 cholestrol, 64,65 ethanol, 146,147 antigens, 160,167 explosives, 150,181 pharmaceuticals 55,140,175 and heavy metals 123 etc. have been detected on IL modified GCE.…”

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“…In addition, ionic liquids have also low viscosities with high conductivities advantages made them to employ in electrochemical devices for fast charge-discharge conditions. Pyrrolidinium and imidazolium are two main applied ionic liquids in electrochemical investigations [26][27][28][29]. Pyrrolidinium compared to imidazolium indicated larger electrochemical stability window (ESW) favorable for SCs operating at higher voltage or contributing mainly to the energy density.…”