Amperometric detection in the presence of carbon nanotubes dispersed in background electrolyte: Evaluating its suitability for capillary electrokinetic chromatography separations of polyphenolic compounds. Issue 16 (3rd August 2015)

• Record Type: Journal Article
• Authors: Moreno, Mónica; Sánchez Arribas, Alberto; Bermejo, Esperanza; Zapardiel, Antonio; Chicharro, Manuel
• Other Names: Escarpa Alberto guestEditor.; Pumera Martin guestEditor.
• Is Part Of: Electrophoresis. Volume 36:Issue 16(2015)
• Page Start: 1945
• Page End: 1952
• Publication Date: 2015-08-03
• Subjects: Amperometric detection -- Carbon nanotubes -- Electrokinetic chromatography -- Polyphenols -- Pseudostationary phase; Electrophoresis -- Periodicals; Electrophoresis -- Periodicals; 541.372
• DOI: 10.1002/elps.201500127
• Languages: English
• ISSNs: 0173-0835

Abstract

Abstract : This work reports on the positive effects observed upon both the separation and analytical signals in electrophoretic separations of selected phenolic compounds when using aqueous BGE containing carbon nanotubes (CNTs) in connection to electrochemical detection (ECD). The influence of the presence of surfactant‐coated CNTs in the BGE upon the amperometric response of probe compounds was evaluated under hydrodynamic regime in capillary flow injection experiments as well as electrophoretic separations. Among the surfactants employed to disperse CNTs within BGE, SDS shows the best results in terms of dispersion stability and degree of dispersion of the CNTs. ECD allows working with BGEs containing CNTs concentrations of, at least, 24.0 mg/L without increasing of baseline noise, on the opposite to that reported when using UV‐visible detection, and the presence of CNTs in the BGE improves the electrochemical response of some of the tested compounds. These benefits were reflected in higher sensibility in the electrochemical signal and additional improved resolution in the electrophoretic separation of (±)‐catechin and sinapic acid when using these BGE containing CNTs.