Vitamin A equivalency and apparent absorption of ß-carotene in ileostomy subjects using a dual-isotope dilution technique
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
| Main Authors: | , , , , , , , , , |
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| Format: | Article/Letter to editor biblioteca |
| Language: | English |
| Subjects: | adults, bioavailability, bioefficacy, carrots, humans, mass-spectrometry, meals, retinol, spinach, volunteers, |
| Online Access: | https://research.wur.nl/en/publications/vitamin-a-equivalency-and-apparent-absorption-of-ß-carotene-in-il |
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| Summary: | 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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