Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 400612
Title Vitamin A equivalency and apparent absorption of ß-carotene in ileostomy subjects using a dual-isotope dilution technique
Author(s) Bouwman, C.A.; Naber, T.H.J.; Breemen, R.B. van; Zhu, D.; Dicke, H.; Siebelink, E.; Hulshof, P.J.M.; Russel, F.G.M.; Schaafsma, G.; West, C.E.
Source British Journal of Nutrition 103 (2010)12. - ISSN 0007-1145 - p. 1836 - 1843.
Department(s) Chair Nutrition and Health over the Lifecourse
Chair Nutrition and Disease
Chair Nutrition Metabolism and Genomics
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) mass-spectrometry - bioavailability - retinol - humans - volunteers - adults - bioefficacy - spinach - carrots - meals
Abstract The objective was to quantify the vitamin A equivalency of ß-carotene in two diets using a dual-isotope dilution technique and the apparent ß-carotene absorption as measured by the oral–faecal balance technique. Seventeen healthy adults with an ileostomy completed the 4-week diet-controlled, cross-over intervention study. Each subject followed both diets for 2 weeks: a diet containing vegetables low in ß-carotene content with supplemental ß-carotene in salad dressing oil (‘oil diet’; mean ß-carotene intake 3·1 mg/d) and a diet containing vegetables and fruits high in ß-carotene content (‘mixed diet’; mean ß-carotene intake 7·6 mg/d). Daily each subject consumed a mean of 190 µg [13C10]ß-carotene and 195 µg [13C10]retinyl palmitate in oil capsules. The vitamin A equivalency of ß-carotene was calculated as the dose-corrected ratio of [13C5]retinol to [13C10]retinol in serum. Apparent absorption of ß-carotene was determined with oral–faecal balance. Isotopic data quantified a vitamin A equivalency of [13C10]ß-carotene in oil of 3·6:1 (95 % CI 2·8, 4·6) regardless of dietary matrices differences. The apparent absorption of (labelled and dietary) ß-carotene from the ‘oil diet’ (30 %) was 1·9-fold higher than from the ‘mixed diet’ (16 %). This extrinsic labelling technique can measure precisely the vitamin A equivalency of ß-carotene in oil capsules, but it does not represent the effect of different dietary matrices
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