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Bovine Colostrum: Determination of Naturally Occurring Steroid Hormones by Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS).

Summary of "Bovine Colostrum: Determination of Naturally Occurring Steroid Hormones by Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)."

The aim of this study was to collect further data about levels of endogenous hormones in foodstuffs derived from animal production. Because of expected higher concentrations of especially estrogens in colostrum compared to other foodstuffs, our investigation focused on this matrix. For evaluation of endogenous steroid hormones in separated colostrum (fat and defatted fraction) and colostrum powder, the relevant free and conjugated estrogens (estradiol-17β, estradiol-17α, estrone, and estriol) androgens (androstendione, 19nor-androstendione, 19nor-testosterone-17β, 19nor-testosterone-17α, testosterone-17β, and testosterone-17α), and progesterone were determined by means of liquid chromatography-tandem mass spectrometry (LC-MS/MS). Upmost determined concentrations were found in the fat fraction, with 25.56 and 7.59 μg/L for estrone and androstendione, respectively. In defatted milk and colostrum powder, conjugated estrogens dominated, whereas total (free and conjugated) estrone (5.51 μg/L; 15.0 μg/kg) exceeded estradiol-17α (2.66 μg/L; 7.5 μg/kg) and estradiol-17β (2.28 μg/L; 3.3 μg/kg). Neither 19nor-steroids nor estriol were detected in colostrum fractions or processed colostrum.

Affiliation

Tiergesundheitsdienst Bayern e.V. , Senator-Gerauer-Strasse 23, 85586 Poing, Germany.

Journal Details

This article was published in the following journal.

Name: Journal of agricultural and food chemistry
ISSN: 1520-5118
Pages: 1423-7

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Proteins found usually in the cytoplasm or nucleus that specifically bind steroid hormones and trigger changes influencing the behavior of cells. The steroid receptor-steroid hormone complex regulates the transcription of specific genes.

Naturally occurring complex liquid hydrocarbons which, after distillation, yield combustible fuels, petrochemicals, and lubricants.

A collective grouping for both naturally occurring and synthetic hormones, substitutes, and antagonists.

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