Journal
FOOD CHEMISTRY
Volume 180, Issue -, Pages 186-193Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.02.043
Keywords
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) derivatives; Sensor; Carbon nanotube; Food additive; Ponceau 4R
Funding
- National Natural Science Foundation of China [51303073, 51463008]
- Ganpo Outstanding Talents 555 projects
- Training Plan for the Main Subject of Academic Leaders of Jiangxi Province
- Natural Science Foundation of Jiangxi Province [20142BAB206028, 20142BAB216029]
- Science and Technology Landing Plan of Universities in Jiangxi province [KJLD12081]
- Jiangxi Provincial Department of Education [GJJ14301]
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Ponceau 4R, an edible synthetic colorant used in drinks, syrups, and sweets, has been successfully detected using differential pulse voltammetry at a single-walled carbon nanotubes-modified composite electrode based on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) and two derivatives thereof. The electrochemical parameters of three Ponceau 4R sensors, such as pH value, pre-concentration time, and scan rate, have been optimized, and their electrochemical performances have been compared. A poly(acrylate-modified 3,4-ethylenedioxythiophene-co-3,4-ethylenedioxythiophene):poly(styrene sulfonate)-single-walled carbon nanotubes-poly(vinyl alcohol)-modified electrode showed the best electrocatalytic activity, with the highest response current, lowest detection limit (1.8 nm), widest linear range (0.0055-110.6 mu m), and best sensing stability. Additionally, the modified electrode has also been successfully employed for real sample analysis with soft drinks. Satisfactory results were obtained, demonstrating this to be an easy and effective approach for trace analysis of Ponceau 4R in food samples. (C) 2015 Elsevier Ltd. All rights reserved.
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