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Efficient enantiorecognition of amino acids under a stimuli-responsive system: synthesis, characterization and application of electroactive rotaxane

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Abstract

In this study, an electroactive rotaxane, (S,S)-crown-3, consisting of a polymeric chiral ionic liquid as a flexible axle and 18-crown-6 as the wheel, was designed and synthesized. It is worth noting that a stimuli-responsive system was developed, in which the wheel could switch its location between the chiral carbamido group and ionic pair of the ionic polymers under an external force. Next, (S,S)-crown-3 was employed as a modification on the surface of glassy electrode. In contrast to previous study, the developed probe presented a clear discrimination of an electrochemical signal in the absence of Cu(II). Under the external force (different pH values), L-isomers of amino acids (tryptophan, tyrosine, and cysteine) could form stable host–guest interactions with the chiral carbamido group, producing higher peak currents than the D-isomers. Compared to the absence of the crown, (S,S)-crown-3 showed much better recognition efficiency. The value of IL/ID for tryptophan could reach 39.8. In brief, the present study describes a powerful method for the synthesis of an electroactive rotaxane with great enantiorecognition capability.

Graphical abstract: Efficient enantiorecognition of amino acids under a stimuli-responsive system: synthesis, characterization and application of electroactive rotaxane

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Publication details

The article was received on 31 Aug 2019, accepted on 20 Sep 2019 and first published on 23 Sep 2019


Article type: Paper
DOI: 10.1039/C9AN01692A
Analyst, 2019, Advance Article

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    Efficient enantiorecognition of amino acids under a stimuli-responsive system: synthesis, characterization and application of electroactive rotaxane

    D. Wu, F. Pan, G. Fan, Z. Zhu, L. Gao, Y. Tao and Y. Kong, Analyst, 2019, Advance Article , DOI: 10.1039/C9AN01692A

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