Abstract
A sensitive electrochemical method was explored for chiral recognition of 3,4-dihydroxyphenylalanine (DOPA) enantiomers based on immobilization of β-cyclodextrin (β-CD) onto the nanocomposite comprising multiwalled carbon nanotubes (MWCNTs) and ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate (BIMIMPF6) modified glassy carbon electrode (β-CD/MWCNTs-IL/GCE). The combination of ionic liquid and carbon nanotubes could create unique nanomaterials which facilitated the electron transfer. In addition, β-CD was brought in to act as the chiral selector for DOPA enantiomers recognition. The immobilization process of β-CD/MWCNTs-IL/GCE was monitored by cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy. The chiral interface (β-CD/MWCNTs-IL/GCE) was employed to discriminate DOPA enantiomers via differential pulse voltammetry. The results indicated that the proposed sensor exhibited a stronger electrochemical response toward D-DOPA over the linear range from 4.0 × 10−3 to 4.0 × 10−9 mol L−1 and the detection limit was 1.2 × 10−9 mol L−1 (S/N = 3). This work provided an available platform for enantioselective recognition of DOPA enantiomers based on the nanocomposite.
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The authors gratefully acknowledge financial support for this study by the National Natural Science Foundation of China (no. 21272188).
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Chen, Y., Huang, Y., Guo, D. et al. A chiral sensor for recognition of DOPA enantiomers based on immobilization of β-cyclodextrin onto the carbon nanotube-ionic liquid nanocomposite. J Solid State Electrochem 18, 3463–3469 (2014). https://doi.org/10.1007/s10008-014-2575-z
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DOI: https://doi.org/10.1007/s10008-014-2575-z