Licht-im-Terrarium: Literaturdatenbank
Licht-im-Terrarium: Literaturdatenbank |
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Chen, T. C., Chimeh, F., Lu, Z., Mathieu, J., Person, K. S., & Zhang, A., et al. (2007). Factors that influence the cutaneous synthesis and dietary sources of vitamin d. Archives of Biochemistry and Biophysics, 460(2), 213–217. Added by: Sarina (2021-08-22 11:25:12) Last edited by: Sarina (2021-08-22 13:35:43) |
| Resource type: Journal Article DOI: https://doi.org/10.1016/j.abb.2006.12.017 ID no. (ISBN etc.): 0003-9861 BibTeX citation key: Chen2007 View all bibliographic details  |
Categories: Englisch = English Keywords: Sonne = Sun, Vitamin D = Vitamin D Creators: Berkowitz, Chen, Chimeh, Holick, Kohn, Lu, Martinello, Mathieu, Person, Zhang Collection: Archives of Biochemistry and Biophysics |
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Meine Sichtweise (Keine vollständige Zusammenfassung des Artikels! Meine Meinung muss nicht mit der Meinung der Autoren übereinstimmen! Bitte lesen Sie auch die Originalarbeit!)
ZusammenfassungHautproben vom Typ II und Typ V sowie Glasampullen wurden im Juni in Boston in der Mittagssonne bestrahlt und die gebildete Vitamin-D3-Menge gemessen.
Zusätzlich wurden der Vitamin-D3-Blutspiegel bei Menschen unterschiedlichen Hauttyps nach regelmäßigem Sonnenstudiobesuch gemessen und die aufgenommene Vitamin-D3-Menge bei verschiedenen Nahrungsmitteln analysiert. Meinung:In Boston erwartet man einen UV-Index 7,0 im Juni, also 17,5 µW/cm² erythemeffektive Bestrahlungsstärke oder 4,0 MED/h. Die Bestrahlungszeiten entsprechen somit 0,34 MED, 0,67 MED, 1,35 MED und 2,02 MED Added by: Sarina Last edited by: Sarina |
| Abstract |
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The major sources of vitamin D for most humans are casual exposure of the skin to solar ultraviolet B (UVB; 290–315nm) radiation and from dietary intake. The cutaneous synthesis of vitamin D is a function of skin pigmentation and of the solar zenith angle which depends on latitude, season, and time of day. In order to mimic the natural environment of skin to sunlight exposure, we therefore measured serum 25-hydroxyvitamin D levels in volunteers with different skin types following repeated UV irradiation. Because melanin pigment in human skin competes for and absorbs the UVB photons responsible for the photolysis of 7-dehydrocholesterol to previtamin D3, we also studied the effect of skin pigmentation on previtamin D3 production in a human skin model by exposing type II and type V skin samples to noon sunlight in June when the solar zenith angle is most acute. Vitamin D is rare in food. Among the vitamin D-rich food, oily fish are considered to be one of the best sources. Therefore, we analyzed the vitamin D content in several commonly consumed oily and non-oily fish. The data showed that farmed salmon had a mean content of vitamin D that was ∼25% of the mean content found in wild caught salmon from Alaska, and that vitamin D2 was found in farmed salmon, but not in wild caught salmon. The results provide useful global guidelines for obtaining sufficient vitamin D3 by cutaneous synthesis and from dietary intake to prevent vitamin D deficiency and its health consequences, ensuing illness, especially, bone fractures in the elderly.
Added by: Sarina |