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• W2016324930 abstract "Homogeneous assays are attractive because they are performed in only one phase, namely, the liquid phase, and thus, they do not require separation of phases as their heterogeneous counterparts do. As opposed to heterogeneous assays, the signal generation in a homogeneous assay is a direct result of analyte binding, which allows the multiple washing and incubation steps required in an indirect heterogeneous assay format to be eliminated. Moreover, homogeneous assays are usually fast and amenable to miniaturization and automation. In this article, we describe the development of a homogeneous assay for the hormone cortisol using the bioluminescent photoprotein aequorin as a reporter molecule. A cortisol derivative was chemically conjugated to the lysine residues of a genetically modified aequorin in order to prepare an aequorin–cortisol conjugate capable of binding anticortisol antibodies. The binding of anticortisol antibodies to the aequorin–cortisol conjugate resulted in a linear response reflected in the emission of bioluminescence by aequorin. A competitive binding assay was developed by simultaneously incubating the aequorin–cortisol conjugate, the anticortisol antibodies, and the sample containing free cortisol. Dose–response curves were generated relating the intensity of the bioluminescence signal with the concentration of free cortisol in the sample. The optimized homogeneous immunoassay produced a detection limit of 1 × 10−10 M of free cortisol, with a linear dynamic range spanning from 1 × 10−5 to 1 × 10−9 M. Both serum and salivary levels of cortisol fall well within this assayʼs linear range (3.0 × 10−7 M to 7.5 × 10−7 M and 1.0 × 10−8 M to 2.5 × 10−8 M, respectively), thereby making this assay attractive for the analysis of this hormone in biological samples. To that end, it was demonstrated that the assay can be reliably used to measure the concentration of free cortisol in saliva without significant pretreatment of the sample." @default.
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• W2016324930 date "2007-10-18" @default.
• W2016324930 modified "2023-09-23" @default.
• W2016324930 title "Aequorin-Based Homogeneous Cortisol Immunoassay for Analysis of Saliva Samples" @default.
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• W2016324930 doi "https://doi.org/10.1021/bc070039u" @default.
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