Vitamin A equivalency and apparent absorption of ß-carotene in ileostomy subjects using a dual-isotope dilution technique

C.A. Bouwman, T.H.J. Naber, R.B. van Breemen, D. Zhu, H. Dicke, E. Siebelink, P.J.M. Hulshof, F.G.M. Russel, G. Schaafsma, C.E. West

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16 Citations (Scopus)

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
Original languageEnglish
Pages (from-to)1836-1843
JournalBritish Journal of Nutrition
Volume103
Issue number12
DOIs
Publication statusPublished - 2010

Keywords

  • mass-spectrometry
  • bioavailability
  • retinol
  • humans
  • volunteers
  • adults
  • bioefficacy
  • spinach
  • carrots
  • meals

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