Abstract
We report on an efficient method for the production carboxy-modified graphene (carboxy-GR), and its application to a highly sensitive immunoassay for the livestock feed additive clenbuterol. Octadecanoic acid is shown to self-assemble on carboxy-GR via intermolecular interaction. Goat anti-mouse IgG was conjugated to 1-octadecanethiol-modified carboxy-GR and then deposited by self-assembly on a C18-modified gold surface. The resulting sensor surface was used to quantify clenbuterol by both surface plasmon resonance and electrochemical impedance spectroscopy. The assay works in the 0.01 ng∙mL−1 to 10 ng∙mL−1 concentration range and the lower detection limit is 6.57 pg∙mL−1. It is concluded that this fairly simple method can be extended to immunoassays for other food additives.
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This work was supported by the Program for the National Natural Science Foundation of China (NSFC Account No. 51173172 and 21104070) and the Science and Technology Opening Cooperation Project of Henan Province (Account No. 132106000076).
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Yan, F., Zhang, Y., Zhang, S. et al. Carboxyl-modified graphene for use in an immunoassay for the illegal feed additive clenbuterol using surface plasmon resonance and electrochemical impedance spectroscopy. Microchim Acta 182, 855–862 (2015). https://doi.org/10.1007/s00604-014-1399-y
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DOI: https://doi.org/10.1007/s00604-014-1399-y