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Sensors 2013, 13(7), 8155-8169; doi:10.3390/s130708155
Article

Development of an Ultrasensitive Immunoassay for Detecting Tartrazine

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Received: 29 May 2013 / Revised: 21 June 2013 / Accepted: 21 June 2013 / Published: 25 June 2013
(This article belongs to the Section Biosensors)

Abstract

We have developed an ultrasensitive indirect competitive enzyme-linked immunosorbent assay for the determination of tartrazine. Two carboxylated analogues of tartrazine with different spacer lengths, and one derivative from commercial tartrazine after a little chemical modification, were synthesized as haptens in order to produce antibodies specific to tartrazine. The effect of sulfonic acid groups on the hapten structure of tartrazine was also studied carefully for the first time. A most specific monoclonal antibody against tartrazine was created and exhibited an IC50 value of 0.105 ng/mL and a limit of detection of 0.014 ng/mL, with no cross-reactivity to other structurally-related pigments. The established immunoassay was applied to the determination of tartrazine in fortified samples of orange juice and in real positive samples of carbonated beverages.
Keywords: tartrazine; ELISA; monoclonal antibody; beverage tartrazine; ELISA; monoclonal antibody; beverage
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Li, Z.; Song, S.; Xu, L.; Kuang, H.; Guo, S.; Xu, C. Development of an Ultrasensitive Immunoassay for Detecting Tartrazine. Sensors 2013, 13, 8155-8169.

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