title: [Natural occurrence of progesterone in commercial milk products (author's transl)].
abstract: By means of radioimmunoassay the concentrations of progesterone in commercial milk products were determined. The values range from 1.4 ng/ml (skin milk) to 300 ng/g (butter). The results show a close correlation between progesterone and fat contents in milk products. It is discussed that - due to recent progress in analytical methods - hormones in their natural occurrence in food are now measurable in micro-quantities which were not yet considered to be of biological importance; these findings should provoke a revision of terms like "free of hormones" in the sense of "zero tolerances".
mesh_terms: D000818:Animals; D002079:Butter / Q000032:analysis; D002417:Cattle; D003611:Dairy Products / Q000032:analysis*; D008892:Milk / Q000032:analysis; D011374:Progesterone / Q000032:analysis*; D011863:Radioimmunoassay
chemical_list: D011374:Progesterone; D002079:Butter
vernacular_title: Natürliche Vorkommen von Progesteron in handelsüblichen Milchprodukten