Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 74, Issue 1, Pages 28-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2009.06.016
Keywords
Carbon nanotubes; Surface enhancement; Modified electrode; Food dyes; Analysis
Funding
- National Natural Science Foundation of China [30772053]
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The insoluble multi-walled carbon nanotubes (MWNT) was successfully dispersed into water in the presence of hydrophobic surfactant. After that, MWNT film-coated glassy carbon electrode (GCE) was achieved via dip-coating and evaporating water. Owing to huge surface area, high sorption capacity and subtle electronic properties, MWNT film exhibits highly efficient accumulation efficiency as well as considerable surface enhancement effects to Sunset Yellow and Tartrazine. As a result, the oxidation peak currents of Sunset Yellow and Tartrazine remarkably increase at the MWNT film-modified GCE. Based on this, a novel electrochemical method was developed for the simultaneous determination of Sunset Yellow and Tartrazine. The limits of detection are 10.0 ng mL(-1) (2.2 x 10(-8) mol L-1) and 0.1 mu g mL(-1) (1.88 x 10(-7) mol L-1) for Sunset Yellow and Tartrazine. Finally, the proposed method was successfully used to detect Sunset Yellow and Tartrazine in soft drinks. (C) 2009 Elsevier B.V. All rights reserved.
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