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Surface plasmon resonance immunosensor for cortisol and cortisone determination

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Abstract

In this paper, we present a surface-plasmon-resonance-based immunosensor for the real-time detection of cortisol and cortisone levels in urine and saliva samples. The method proposed here is simple, rapid, economic, sensitive, robust, and reproducible thanks also to the special features of the polycarboxylate-hydrogel-based coatings used for the antibody immobilization. The sensor surface displays a high level of stability during repeated regeneration and affinity reaction cycles. The immunosensor shows high specificity for cortisol and cortisone; furthermore, no significant interferences from other steroids with a similar chemical structure have been observed. The suitability of the hydrogel coating for the prevention of nonspecific binding is also investigated. A good correlation is noticed between the results obtained by the proposed method and the reference liquid chromatography/tandem mass spectrometry method for the analysis of cortisol and cortisone in urine and saliva samples. Standard curves for the detection of cortisol and cortisone in saliva and urine are characterized by a detection limit less than 10 μg l−1, sufficiently sensitive for both clinical and forensic use.

Application of a newly developed SPR immunosensor for the measurement of cortisol in anti-doping analysis

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Authors and Affiliations

  1. Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185, Rome, Italy

    Marco Frasconi & Franco Mazzei

  2. Laboratorio Antidoping Federazione Medico Sportiva Italiana, Largo Giulio Onesti 1, 00197, Rome, Italy

    Monica Mazzarino & Francesco Botrè

Authors
  1. Marco Frasconi
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  2. Monica Mazzarino
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  3. Francesco Botrè
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  4. Franco Mazzei
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Correspondence to Franco Mazzei.

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Frasconi, M., Mazzarino, M., Botrè, F. et al. Surface plasmon resonance immunosensor for cortisol and cortisone determination. Anal Bioanal Chem 394, 2151–2159 (2009). https://doi.org/10.1007/s00216-009-2914-6

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  • DOI: https://doi.org/10.1007/s00216-009-2914-6

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