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      The determination of five steroids in avian plasma by radioimmunoassay and competitive protein-binding

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      Steroids

      Elsevier BV

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          Abstract

          A method has been developed for the simultaneous determination of testosterone, 5alpha-dihydrotestosterone and corticosterone, or of estrone, estradiol-17beta and corticosterone, after separation on a Celite:propylene glycol:ethylene glycol column (6:1.5:1.5 w/v/v). The lower quarter of the column was packed with a Celite: water mixture (3:1 w/v) as a stationary phase (glycol) 'trap'. This effectively prevented leaching of the glycols into the eluate as the concentration of ethyl acetate in the mobile phase was increased to elute the more polar steroids. In addition, a second system utilizing a Celite: ethylene glycol column (2:1 w/v) for the separation of estrone and estradiol-17beta is described. Testosterone, 5alpha-dihydrotestosterone, estrone and estradiol-17beta were measured by radioimmunoassay and corticosterone by a competitive protein-binding technique. Reliability criteria are presented showing that the assay systems used are accurate and reproducible. Plasma-steroid levels of eight avian species are also presented and compared with those found by other investigators.

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          Author and article information

          Journal
          Steroids
          Steroids
          Elsevier BV
          0039128X
          September 1975
          September 1975
          : 26
          : 3
          : 311-327
          Article
          10.1016/0039-128X(75)90077-X
          1198621
          38b1db26-b52b-4c30-8f77-d46c47c86c3d
          © 1975

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