Hoffmann B, Hamburger R, Karg H
Z Lebensm Unters Forsch. 1975 Aug 28;158(5):257-9. doi: 10.1007/BF01525472.
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".
通过放射免疫分析法测定了市售奶制品中孕酮的浓度。其值范围从1.4纳克/毫升（脱脂奶）到300纳克/克（黄油）。结果表明奶制品中孕酮与脂肪含量之间存在密切相关性。文中讨论了——由于分析方法的最新进展——食品中天然存在的激素现在可以微量测定，而这些微量激素以前被认为没有生物学重要性；这些发现应该促使人们对“无激素”等术语按照“零容忍”的意义进行修订。
