Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 197, Issue -, Pages 104-108Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.02.064
Keywords
Exfoliated graphite; Signal enhancement; Tartrazine; Electrochemical sensor; Solvent exfoliation
Funding
- National Natural Science Foundation of China [21375041, 61071052]
- Program for New Century Excellent Talents in University [NCET-11-0187]
- Open Foundation of Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province [PKLHB1101]
- Research Project of General Administration of Quality Supervision, Inspection and Quarantine of China [2013Qk279]
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Exfoliated graphite was facilely prepared through one-step liquid exfoliation of graphite powder in Nmethyl-2-pyrrolidone. The resulting exfoliated graphite was redispersed into N,N-dimethylformamide, and then used to modify the surface of glassy carbon electrode (GCE) via solvent evaporation. The electrochemical behaviors of tartrazine were studied, and a sensitive oxidation peak was observed. Interestingly, the oxidation peak current of tartrazine was greatly improved on the surface of exfoliated graphite-modified GCE. The considerable peak current enlargement indicates that the exfoliated graphite exhibits remarkable signal enhancement effects toward tartrazine oxidation. The influences of pH value, amount of exfoliated graphite, accumulation potential and time were examined on the oxidation signal of tartrazine. As a result, a sensitive and rapid electrochemical method was developed for the detection of tartrazine. The linear range was from 5 mu g/L to 0.2 mg L-1, and the detection limit was 1.5 mu g/L (2.8 nM). This new sensor was used in soft drink samples, and the detected results consisted with the values that obtained by high-performance liquid chromatography. (C) 2014 Elsevier B.V. All rights reserved.
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