Quantification of the bioavailability of riboflavin from foods by use of stable-isotope labels and kinetic modeling 2

DAINTY, Jack R., BULLOCK, Natalie R., HART, Dave J., HEWSON, Alan T., TURNER, Rufus, FINGLAS, Paul M. and POWERS, Hilary J. (2007). Quantification of the bioavailability of riboflavin from foods by use of stable-isotope labels and kinetic modeling 2. The American Journal of Clinical Nutrition, 85 (6), 1557-1564.

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Abstract

Background:Discrepancies have been reported between estimates of the prevalence of riboflavin deficiency based on intakes of riboflavin and estimates based on measures of riboflavin status. One reason for this may be an overestimate of the bioavailability of riboflavin from foods, about which relatively little is known. Objective:We aimed to quantify the bioavailability of riboflavin from milk and spinach by using stable-isotope labels and a urinary monitoring technique and by a plasma appearance method based on kinetic modeling. Design:Twenty healthy women aged 18–65 y were recruited for a randomized crossover study performed with extrinsically labeled (13C) milk and intrinsically labeled (15N) spinach as sources of riboflavin. An intravenous bolus of labeled riboflavin was administered with each test meal to assess the apparent volume of distribution of riboflavin in plasma. Results:No significant differences were noted in riboflavin absorption from the spinach meal and from the milk meal according to either the urinary monitoring technique (60 ± 8.0% and 67 ± 5.4%, respectively; P= 0.549) or the plasma appearance method (20 ± 2.8% and 23 ± 5.3%, respectively; P= 0.670). Conclusions:A large fraction of newly absorbed riboflavin is removed by the liver on “first pass.” The plasma appearance method therefore underestimates riboflavin bioavailability and should not be used to estimate riboflavin bioavailability from foodstuffs. Urinary monitoring suggests that riboflavin from spinach is as bioavailable as is riboflavin from milk.

Item Type:	Article
Additional Information:	** Article version: VoR ** From Elsevier via Jisc Publications Router **Journal IDs: issn 00029165 **History: published_online 25-02-2023; issued 30-06-2007; accepted 19-01-2007 **License for this article: starting on 25-02-2023, , http://www.elsevier.com/open-access/userlicense/1.0/
Identification Number:	https://doi.org/10.1093/ajcn/85.6.1557
Page Range:	1557-1564
SWORD Depositor:	Colin Knott
Depositing User:	Colin Knott
Date Deposited:	02 Mar 2023 14:48
Last Modified:	02 Mar 2023 14:48
URI:	https://shura.shu.ac.uk/id/eprint/31595

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