Journal
FOOD CHEMISTRY
Volume 179, Issue -, Pages 318-324Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.01.143
Keywords
Amaranth; Determination; Food analysis; CNT; Graphene oxide; Ionic liquid
Funding
- National Natural Science Foundation of China [21121091, 21273113]
- National Science and Technology Support Project [2012BAF03B05]
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Graphene oxide (GO) is a pH-dependent amphiphile. In this paper, it was found that carbon nanotubes (CNTs) can be highly dispersed in graphene oxide water with the aid of prototype ionic liquid of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]). The introduction of [BMIM][PF6] not only can minimize the defects of poor electrical conductivity of GO, but also can improve the dispersibility of CNT in water. Hence, a new composite of CNT/GO-[BMIM][PF6] with high dispersibility and strong conductivity was presented for the first time and employed in the sensitive determination of Amaranth in soft drinks. The detection limit achieved (0.1 nM) is much lower than the guideline values in soft drinks. The ease of preparation, low background current, high sensitivity and stability can create novel avenues and applications for fabricating robust sensors for determination of other azo dyes in foods. (C) 2015 Elsevier Ltd. All rights reserved.
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