title: Method for the quantitation of steroids in umbilical cord plasma.
abstract: A method for simultaneous quantitation of nine steroids in cord plasma is described which consists of Amberlite XAD-2-column chromatography at constant temperature of 45 degrees C, enzyme hydrolysis with beta-glucoronidase/aryl sulfatase, addition of five radioactive internal standards, ethyl acetate extraction, thin layer chromatography and quantitation by gas-liquid chromatography after trimethylsilyl ether derivative formation. Reliability criteria are established and the following steroid concentrations found: progesterone, 132.1 +/- 102.5 mug/100 ml; pregnenolone, 57.3 +/- 45.7 mug/100 ml; dehydroepiandrosterone, 46.5 +/- 29.4 mug/100 ml; pregnanediol, 67.5 +/- 46.6 mug/100 ml; 16-ketoandrostenediol 19.8 +/- 13.7 mug/100 ml; 16 alpha-hydroxydehydroepiandrosterone, 126.3 +/- 86.9 mug/100 ml; 16 alpha-hydroxypregnenolone, 78.2 +/- 56.5 mug/100 ml; androstenetriol, 22.2 +/- 17.5 mug/100 ml and oestriol, 127.7 +/- 116.9 mug/100.
mesh_terms: D006907:17-alpha-Hydroxypregnenolone / Q000097:blood; D000736:Androstenes / Q000097:blood; D001192:Arylsulfatases / Q000378:metabolism; D002845:Chromatography / Q000379:methods; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D003687:Dehydroepiandrosterone / Q000097:blood; D004964:Estriol / Q000097:blood; D005312:Fetal Blood / Q000032:analysis*; D006801:Humans; D006868:Hydrolysis; D007231:Infant, Newborn; D007664:Ketosteroids / Q000097:blood; D011276:Pregnanediol / Q000097:blood; D011284:Pregnenolone / Q000097:blood; D011374:Progesterone / Q000097:blood; D013256:Steroids / Q000097:blood*
chemical_list: D000736:Androstenes; D007664:Ketosteroids; D013256:Steroids; D006907:17-alpha-Hydroxypregnenolone; D003687:Dehydroepiandrosterone; D011374:Progesterone; D011284:Pregnenolone; D001192:Arylsulfatases; D004964:Estriol; D011276:Pregnanediol