Abstract
Accurate and reliable determination of synthetic dyes in foodstuff is very important to underpin their regulation so as to prevent harm to consumers. Herein, a poly(L-phenylalanine)-modified glassy carbon electrode (PLPA/GCE) for the determination of sunset yellow (SY) and tartrazine (Tz) was fabricated through electrochemical immobilization. The electrochemical behavior of SY and Tz at the PLPA/GCE was studied by cyclic voltammetry in phosphate-citrate buffer, and the results showed that the reaction of SY and Tz at the PLPA/GCE was greatly facilitated. This was further used to determine the two species by differential pulse voltammetry. Under optimized analytical conditions, the reduction peak current of SY showed a linear relationship with its concentration in a range of 181–6,333 μg L−1 and the oxidation peak current of Tz showed a linear relationship with its concentration in a range of 214–88,169 μg L−1. The limits of detection for SY and Tz were 18.1 and 10.7 μg L−1, respectively. The proposed method shows excellent sensitivity, selectivity, and accuracy and has been satisfactorily applied for the determination of SY and Tz in a variety of real food and drug samples.
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This work was financially supported by the Heze University Scientific Research Fund (no. XY12BS07).
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Mingyong Chao declares that he has no conflict of interest. Xinying Ma declares that she has no conflict of interest. This article does not contain any studies with human or animal subjects.
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Chao, M., Ma, X. Convenient Electrochemical Determination of Sunset Yellow and Tartrazine in Food Samples Using a Poly(L-Phenylalanine)-Modified Glassy Carbon Electrode. Food Anal. Methods 8, 130–138 (2015). https://doi.org/10.1007/s12161-014-9879-6
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DOI: https://doi.org/10.1007/s12161-014-9879-6