Results 151 to 160 of about 508 (195)
Changes in the contents of fat-soluble vitamins and provitamins during tempe fermentation
International Journal of Food Microbiology, 1998 The content and formation of fat-soluble vitamins and provitamins during tempe fermentation was studied with 14 different strains of Rhizopus sp. All strains investigated form carotenoids in small amounts during fermentation, but beta-carotene formation was only found in fermentations with six Rhizopus strains.
J, Denter, H J, Rehm, B, Bisping
exaly +4 more sources
Journal of Chromatography A, 2000 The fat-soluble vitamins A, D2, D3, E and K1, retinyl acetate, retinyl palmitate, tocopherol acetate, ergosterol and 7-dehydrocholesterol in milk were separated on a packed reversed-phase fused-silica microcolumn, and determined with UV detection. Conventional liquid chromatographic equipment was adapted for such purposes, providing a highly efficient ...
M D Gutierrez, Paula Fernández
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Provitamins and vitamins D2 and D3 in Cladina spp. over a latitudinal gradient: possible correlation with UV levels [PDF]
Journal of Photochemistry and Photobiology B: Biology, 2001 Provitamin D2, vitamin D2 and vitamin D3 were identified in the thallus of a lichen species, Cladina arbuscula (Wallr.) Hale and W.L. Culb. The identification of vitamin D3 was supported by: (1) co-chromatography in both reverse and straight phase HPLC ...
Göran Bengtsson +2 more
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Provitamin A and Vitamin C in the Genus Lycopersicon
Botanical Gazette, 1943Tomatoes are a good source of both provitamin A (X-carotene) and vitamin C, and they are of greater value in human nutrition as a source of essential vitamins and minerals than as a source of energy. Studies here reported were made to determine the genetic variability in the contents of provitamin A and vitamin C of commercial varieties and related ...
Ralph E. Lincoln +4 more
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Vitamin and provitamin a levels in epithelial cancers: A preliminary study
Nutrition and Cancer, 1990A major physiological role of retinoids is the regulation of epithelial and epidermal cell differentiation. A total of 285 patients with clinically and histopathologically confirmed diagnosis of various carcinomas (untreated) were selected for the study.
P G, Ramaswamy +3 more
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Vitamine, Provitamine und Carotinoide
1967Bei den unter dem Sammelbegriff „Vitamin“ fallenden Substanzen ist in erster Linie deren biologische Wirkung von Interesse. Nun ist bei den einzelnen Vitaminen jedoch nicht nur eine Substanz, sondern eine ganze Gruppe von Substanzen Trager dieser Wirkung (siehe dazu G. Brubacher u. Mitarb. [1965 S. 936–937]).
J. P. Vuilleumier +2 more
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Vitamin A and the provitamin A carotenoids
1998In 1915 McCollum and Davis isolated from animal fats and fish oils a ‘fat-soluble A’ that was essential to rats for growth and also cured eye disorders. In 1921 Bloch reported that a diet containing full milk and cod-liver oil cured xerophthalmia in infants and concluded that the eye affliction was due to the absence of the fat-soluble A in the diet ...
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Finding Food Sources of Vitamin A and Provitamin A
Food and Nutrition Bulletin, 2000Food-based programmes have the potential to effect long-term and sustainable solutions to the problem of vitamin A deficiency. Dietary sources of vitamin A and provitamin A, including natural and fortified food, are multiple and include a variety of plants, animals, and their fats and oils.
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Provitamin A Function of Carotenoids: The Conversion of β-Carotene into Vitamin A
The Journal of Nutrition, 1989Two pathways have been suggested for the conversion of carotenoids to vitamin A in mammals, central cleavage and excentric cleavage. An enzyme, beta-carotenoid-15,15'-dioxygenase (EC 1.13.11.21), has been partly purified from the intestines of several species and has been identified in several other organs and species.
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