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Development of a label-free immunosensor system for detecting plasma cortisol levels in fish

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Abstract

Fishes display a wide variation in their physiological responses to stress, which is clearly evident in the plasma corticosteroid changes, chiefly cortisol levels in fish. In the present study, we describe a novel label-free immunosensor for detecting plasma cortisol levels. The method is based on immunologic reactions and amperometric measurement using cyclic voltammetry. For the immobilization of the antibody on the surface of sensing electrode, we used a self-assembled monolayer of thiol-containing compounds. Using this electrode, we detect the CV signal change caused by the generation of antigen–antibody complex. The immunosensor showed a response to cortisol levels, and the anodic peak value linearly decreased with a correlation coefficient of 0.990 in diluted plasma. The specificity of the label-free immunosensor system was investigated using other steroid hormones, such as 17α, 20β-dihydroxy-4-pregnen-3-one, progesterone, estriol, estradiol, and testosterone. The specific detection of cortisol was suggested by a minimal change from −0.32 to 0.51 μA in the anodic peak value of the other steroid hormones. The sensor system was used to determine the plasma cortisol levels in Nile tilapia (Oreochromis niloticus), and the results were compared with those of the same samples determined using the conventional method (ELISA). A good correlation was obtained between values determined using both methods (correlation coefficient 0.993). These findings suggest that the proposed label-free immunosensor could be useful for rapid and convenient analysis of cortisol levels in fish plasma samples.

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Acknowledgments

This research was supported in part by a Grant-in-Aid for Scientific Research (B) from The Ministry of Education, Culture, Sports, Science, and Technology in Japan.

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Authors and Affiliations

  1. Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7, Konan, Minato-ku, Tokyo, 108-8477, Japan

    Haiyun Wu, Kyoko Hibi, Huifeng Ren & Hideaki Endo

  2. Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, 2-1-6, Etchujima, Koto-ku, Tokyo, 135-8533, Japan

    Hitoshi Ohnuki

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  1. Haiyun Wu
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  2. Hitoshi Ohnuki
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  3. Kyoko Hibi
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  4. Huifeng Ren
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  5. Hideaki Endo
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Correspondence to Hideaki Endo.

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Wu, H., Ohnuki, H., Hibi, K. et al. Development of a label-free immunosensor system for detecting plasma cortisol levels in fish. Fish Physiol Biochem 42, 19–27 (2016). https://doi.org/10.1007/s10695-015-0113-2

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  • DOI: https://doi.org/10.1007/s10695-015-0113-2

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