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- W1996073880 abstract "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 (76 μW/cm2) for 0, 15, 30, 60, 120, 180 and 300 min 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 300 min resulted in vitamin D3 contents of 28.6 μg/100 g 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 60 min/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’." @default.
- W1996073880 created "2016-06-24" @default.
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- W1996073880 date "2015-04-01" @default.
- W1996073880 modified "2023-10-10" @default.
- W1996073880 title "Non-linear increase of vitamin D content in eggs from chicks treated with increasing exposure times of ultraviolet light" @default.
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- W1996073880 doi "https://doi.org/10.1016/j.jsbmb.2014.10.015" @default.
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