Possible origin of extremely high contents of vitamin D3 in some kinds of fish liver |
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| Institution: | 1. From the Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand.;2. Research Center, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand.;3. Department of Community Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand.;1. Ufa State Aviation Technical University, Ufa 450008, Russia;2. Laboratory for Mechanics of Bulk Nanomaterials, Saint Petersburg State University, Saint Petersburg 198504, Russia;3. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, PR China;4. Sino-Russian Joint Laboratory of Functional Nanostructured Materials, Changzhou University, Changzhou 213164, PR China |
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| Abstract: | - 1.1. Comparative studies on the possible origin of extremely high contents of vitamin D3 in some kinds of fish liver were performed.
- 2.2. Neither photochemical formation of vitamin D3 in fish skin by solar radiation of 7-dehydrocholesterol (7-DHC) nor nonphotochemical enzymatic formation of vitamin D3 from 7-DHC in fish liver was demonstrated as the origin of vitamin D3.
- 3.3. On the other hand, when bastard halibuts and carps were farmed from fingerlings to adults with feedstuff's containing vitamin D2 or D3, significant amounts of the vitamins were accumulated in the fish liver.
- 4.4. The contents of vitamins D2 and D3 in bastard halibut liver increased according to the duration of farming and dose responses of the vitamins in carp liver were observed.
- 5.5. Significant amounts of vitamins D2 and D3 in phytoplankton and vitamin D3 in Zooplankton and small fish were detected.
- 6.6. Therefore, we have concluded that the most probable origin of vitamin D3 in fish liver is a result of food chains from plankton.
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