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Electrochemical enantiorecognition of tryptophan enantiomers based on a multi-walled carbon nanotube–hydroxyethyl chitosan composite film

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Abstract

A novel chiral electrochemical sensor based on hydroxyethyl chitosan (HECS) covalently binding with the carboxylic multi-walled carbon nanotubes (MWCNT–COOH) was fabricated for discrimination of tryptophan (Trp) enantiomers. HECS preferably combined with L-Trp than with D-Trp because of the favorability of host–guest interactions between HECS and Trp enantiomers. Thus, the recognition efficiency was remarkably improved after hydroxyethyl groups were grafted onto chitosan (CS); this might be attributed to the formation of hydrogen bonds between Trp enantiomers and HECS. In addition, the small stereo-hindrance effect could play an important role in enantioselective discrimination.

Graphical abstract: Electrochemical enantiorecognition of tryptophan enantiomers based on a multi-walled carbon nanotube–hydroxyethyl chitosan composite film

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Publication details

The article was received on 21 Jul 2017, accepted on 07 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7AY01775H
Citation: Anal. Methods, 2017, Advance Article
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    Electrochemical enantiorecognition of tryptophan enantiomers based on a multi-walled carbon nanotube–hydroxyethyl chitosan composite film

    Z. Li, Z. Mo, R. Guo, S. Meng, R. Wang, H. Gao and X. Niu, Anal. Methods, 2017, Advance Article , DOI: 10.1039/C7AY01775H

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