Non-linear increase of vitamin D content in eggs from chicks treated with increasing exposure times of ultraviolet light.

Autor: Kühn J; Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, Halle (Saale) 06120, Germany. Electronic address: julia.kuehn@landw.uni-halle.de., Schutkowski A; Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, Halle (Saale) 06120, Germany. Electronic address: alexandra.schutkowski@landw.uni-halle.de., Hirche F; Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, Halle (Saale) 06120, Germany. Electronic address: frank.hirche@landw.uni-halle.de., Baur AC; Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, Halle (Saale) 06120, Germany. Electronic address: anja-christina.baur@student.uni-halle.de., Mielenz N; Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, Halle (Saale) 06120, Germany. Electronic address: norbert.mielenz@landw.uni-halle.de., Stangl GI; Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, Halle (Saale) 06120, Germany. Electronic address: gabriele.stangl@landw.uni-halle.de.
Jazyk: angličtina
Zdroj: The Journal of steroid biochemistry and molecular biology [J Steroid Biochem Mol Biol] 2015 Apr; Vol. 148, pp. 7-13. Date of Electronic Publication: 2014 Oct 27.
DOI: 10.1016/j.jsbmb.2014.10.015
Abstrakt: Vitamin D fortified food can help to reduce the prevalence for vitamin D deficiency. Previous data provided evidence that eggs from hens exposed to ultraviolet (UV) light contain large quantities of vitamin D. In the current study, we assessed the efficacy of vitamin D enrichment in eggs upon increasing daily UVB exposure times. We further addressed the question whether extended UVB irradiation affects the skin content of 7-dehydrocholesterol. To this end, 35 hens were assigned to 7 groups of 5 animals each and were exposed to UVB light (76μW/cm(2)) for 0, 15, 30, 60, 120, 180 and 300min per day, respectively. Eggs from the treatment groups were collected at baseline and after 2, 3 and 4 weeks of treatment, respectively. Skin samples were gained at the end of 4 weeks. Vitamin D metabolites were quantified by liquid chromatography-tandem mass spectrometry. The contents of vitamin D3 and 25(OH)D3 in egg yolk raised non-linear in response to increasing daily UVB exposure times. The vitamin D3 content did not reach a clear-cut plateau within the chosen UVB treatment times. A daily UVB exposure time of 300min resulted in vitamin D3 contents of 28.6μg/100g egg yolk dry matter. In contrast to vitamin D3, the 25(OH)D3 content in the egg yolk achieved a maximum upon an UVB irradiation time of 60min/d. The cutaneous 7-dehydrocholesterol contents were not altered in response to the chosen UVB irradiation times. In conclusion, the data show a distinct non-linear dose-response relationship of UVB exposure times on the total vitamin D content in eggs. This article is part of a special issue entitled '17th Vitamin D Workshop'.
(Copyright © 2014 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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