Journal
MICROCHIMICA ACTA
Volume 181, Issue 5-6, Pages 501-509Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-014-1174-0
Keywords
Graphene; Cyclodextrin; Chiral recognition; Ligand exchange; Tryptophan enantiomers
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Funding
- National Natural Science Foundation of China [21175047, 21147003]
- Scientific Research Foundation of Graduate School of South China Normal University [2012kyjj217]
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We report on a method for electrochemical enantioselective recognition of tryptophan (Trp) enantiomers. It is based on competitive host-guest interaction between a deoxy-(2-aminoethylamino)-beta-cyclodextrin (CD) bound to graphene nanosheets and the Cu(II) complexes of the Trp enantiomers via a ligand exchange mechanism. Chiral recognition was investigated via cyclic voltammetry and electrochemical impedance spectroscopy. The results reveal that the CD bound to graphene displays a stronger interaction with the Cu(II) complex of L-Trp than to that of D-Trp. The method was applied to the determination of the ratio of Trp enantiomers in mixtures.
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