Study on the inclusion interaction of ethyl violet with cyclodextrins by MWNTs/Nafion modified glassy carbon electrode

Original Article


The interactions of ethyl violet (EV) with cyclodextrins (CDs) were investigated by Multi-wall carbon nanotubes/Nafion composite film modified glassy carbon electrode (MWNTs/Nafion/GCE). It was found that the MWNTs/Nafion composite film can effectively catalyze the electrode reaction of EV. The variation of the electrochemical behavior of EV upon the addition of CDs indicated the formation of the inclusion complexes of EV with β-CD, heptakis (2,3,6-tri-O-methyl)-β-CD (TM-β-CD), heptakis (2,6-di-O-methyl)-β-CD (DM-β-CD), hydroxypropyl-β-CD (HP-β-CD), and carboxymethyl-β-CD (CM-β-CD). The stoichiometry ratios of EV and the above five CDs were found to be 1:1. The inclusion ability obeyed the order: CM-β-CD > HP-β-CD > TM-β-CD > DM-β-CD > β-CD. The results showed that the modified β-CDs exhibited stronger binding ability than native β-CD, especially the charged CM-β-CD, which implied that the inclusion capacity depends on not only size matching and hydrophobicity but also electrostatic interaction. 1HNMR spectra and molecule mechanics calculations suggested that EV was included into the cavity of β-CD from the wider side.


Ethyl violet Carbon nanotubes Nafion Cyclodextrin Differential pulse voltammetry 



This work was supported by the National Natural Science Foundation of China (No: 20875059) and the Natural Science Foundation of Shanxi Province of China (No: 2009011012-1).

Supplementary material

10847_2010_9811_MOESM1_ESM.doc (123 kb)
Supplementary material 1 (DOC 123 kb)


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Research Center for Environmental Science and Engineering, Department of ChemistryShanxi UniversityTaiyuanChina
  2. 2.College of Chemistry and Chemical EngineeringShanxi Datong UniversityDatongChina

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