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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.