Sensitive determination of Amaranth in drinks by highly dispersed CNT in graphene oxide "water" with the aid of small amounts of ionic liquid.
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.
Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 21008, Jiangsu Province, PR China.
Meiling
M
Wang
Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 21008, Jiangsu Province, PR China.
Yinlu
Y
Sun
Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 21008, Jiangsu Province, PR China.
Xiongbo
X
Yang
Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 21008, Jiangsu Province, PR China. Electronic address: zhaojw@nju.edu.cn.
Jianwei
J
Zhao
D000548:Amaranth Dye; D001628:Beverages / Q000032:analysis*; D005504:Food Analysis; D006108:Graphite / Q000378:metabolism*; D052578:Ionic Liquids / Q000378:metabolism*; D037742:Nanotubes, Carbon; D014867:Water / Q000737:chemistry*
D052578:Ionic Liquids; D037742:Nanotubes, Carbon; D014867:Water; D006108:Graphite; D000548:Amaranth Dye
1-Butyl-3-methylimidazolium hexafluorophosphate (PubChem CID: 2734174); Acetic acid (PubChem CID: 176); Amaranth; Amaranth (PubChem CID: 6093196); Boric acid (PubChem CID: 7628); CNT; Determination; Food analysis; Graphene oxide; Ionic liquid; Oxalic acid (PubChem CID: 971); Phosphoric acid (PubChem CID: 1004); Ponceau 4R (PubChem CID: 9570119); Quinoline yellow (PubChem CID: 24671); Saccharin (PubChem CID: 5143); Sodium citrate (PubChem CID: 6224); Sodium hydroxide (PubChem CID: 14798)