Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 311, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.127911
Keywords
Molecularly imprinted poly (ionic liquid); Cross-linker; Electrochemical sensor; Rutin; Ionic liquid; Graphene
Funding
- National Natural Science Foundation of China [21507041, 21677060]
- Zhejiang Provincial Natural Science Foundation of China [LY20B050009, LQ14B050002]
- Open Project of MOE Key Laboratory for Analytical Science of Food Safety and Biology [FS18011]
- Program for Science and Technology of Jiaxing [2019BZ11005, 2018AY11002]
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A novel electrochemical sensor for rutin determination based on molecularly imprinted poly (ionic liquid) (MIPIL)/ionic liquid-graphene (IL-GR) modified electrode was developed. MIPIL was synthesized via free radical polymerization using rutin as the template, 1-allyl-3-ethyl imidazolium bromide ([AEIm]Br) as the functional monomer and 1,4-butanediyl-3,3'-bis-L-vinylimidazolium dibromide ([V2C4(mim)(2)]Br-2) as the cross-linker. The composite of IL-GR as an electrode sensitive element was prepared using carboxymethyl-3-methylimidazolium chloride ([HO(2)CMMIm]Cl) by one-step ultrasound method. Fourier transform infrared spectroscopy and scanning electron microscope were used to characterize IL-GR and MIPIL. The increased surface area and conductivity of IL-GR/GCE improved the sensitivity of rutin sensor. Under the optimum condition, good linearity for rutin analysis by the MIPIL-based sensor was obtained from 0.03 to 1 mu M. A low limit of detection for rutin was 0.01 mu M (S/N=3). The MIPIL-based sensor demonstrated superiority on DPV response compared to the imprinted sensors based on traditional cross-linkers. The proposed sensor presented good selectivity for rutin and successfully applied for rutin determination in tablets with RSD of 3.05 % and the average recovery range was 98.3 %.
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