Abstract
An electrochemical method for fast detecting the concentration of sunset yellow FCF in wine samples was developed in this study. The sensor based on imprinted films which fabricated by electropolymerization of pyrrole on a glassy carbon electrode in the presence of sunset yellow FCF as the template. Comparing to the polypyrrole non-imprinted modified (NIP) electrode, the polypyrrole molecularly imprinted polymer (MIP) electrode improved the electrochemical performance of the sensor significantly. The peak current at about 0.26 V was linear with the concentration of sunset yellow FCF from 0.4 to 2 μM and from 2 to 8 μM. It can be used for more than 10 times to maintain a stable response result. The sensor had the good selectivity on sunset yellow FCF, amaranth and tartrazine, which the selection factors were 1.00, 0.80 and 0.85，respectively.
Highlights
Sunset yellow FCF is a synthetic azo dye, which has been widely added into foods and drinks for its high stability to light, oxygen and pH and low production cost [1]
All experiments were performed through an electrochemical analyzer LK2005A (Tianjin, China) connecting to a computer and carrying out with a conventional three-electrode cell with glassy carbon (GC) electrode(ø = 4mm) which was covered by non-molecularly imprinted polymer (MIP) or MIP polypyrrole film as the working electrode, while an Ag/AgCl/saturated KCl electrode and a platinum wire served as the reference electrode and the auxiliary electrode respectively
The results shown that the highest current response of the MIP electrodes to sunset yellow FCF was obtained by applying 10 cycles
Summary
Sunset yellow FCF is a synthetic azo dye, which has been widely added into foods and drinks for its high stability to light, oxygen and pH and low production cost [1]. In China, sunset yellow FCF is permitted and the value of acceptable daily intake (ADI) is between 0 and 2.5 mg·kg-1 according to the hygienic standards for uses of food additive (GB 2760-1996). Several methods have been applied for the detection of sunset yellow FCF, such as spectrophotometry [3], HLPC [4,5] and LC/MS [6]. Numerous electrochemistry methods are applied to sunset yellow FCF detection via modified working electrode such as multi-walled carbon nanotubes film-modified electrode [1,7] and Platinum wire–coated electrode [8], which have high sensitivity but lower selectivity. A sensor based on MIPs for sunset yellow FCF detection has not been reported. An amperometric sensor for sunset yellow FCF measuring was developed in this paper
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