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Pubmed ID :11377980
Publication Date : //

A new specific and sensitive time resolved-fluoroimmunoassay of 11-deoxycortisol in serum.


A biotinylated 11-deoxycortisol tracer was synthesized from 11-deoxycortisol-3-carboxymethyloxime and the conjugate obtained by acylation of biotinylaminopropylammonium trifluoroacetate. This biotinylated tracer was used to develop an 11-deoxycortisol time-resolved-fluoroimmunoassay (TR-FIA). The tracer was quantified after adding streptavidine-Europium. A TR-FIA sensitive standard curve, with displacement of 20, 50, and 80% of tracer was obtained with 12.4, 70.7, and 512.8 pg of 11-deoxycortisol, respectively. After extraction followed by Celite chromatography, purified serum samples were simultaneously assayed by RIA and TR-FIA. The results obtained by the two methods were practically identical, however, this new specific, non-isotopic 11-deoxycortisol assay has the advantage of being more sensitive than RIA, thus well-suited to accurate measurement in endocrinological studies, particularly when serum 11-deoxycortisol levels in patients are just above the highest normal values. Moreover, this non-isotopic assay is cheaper than RIA.

Authors : Fiet J , Giton F , Boudou P , Villette J M , Soliman H , Morineau G , Boudi A , Galons H ,

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