Schär, Manuel Y, Corona, Giulia, Soycan, Gulten, Dine, Clemence, Kristek, Angelika, Alsharif, Sarah NS, Behrends, Volker, Lovegrove, Alison, Shewry, Peter R and Spencer, Jeremy PE (2017) Excretion of avenanthramides, phenolic acids and their major metabolites following intake of oat bran. Molecular nutrition & food research, 62 (2). p. 1700499. ISSN 1613-4125

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Abstract

Wholegrain has been associated with reduced chronic disease
mortality, with oat intake particularly notable for lowering blood cholesterol and glycemia. To better understand the complex nutrient profile of oats, we studied urinary excretion of phenolic acids and avenanthramides after
ingestion of oat bran in humans. Methods and results: After a 2-d (poly)phenol-low diet, seven healthy men
provided urine 12 h before and 48 h after consuming 60 g oat bran (7.8 μmol avenanthramides, 139.2 μmol phenolic acids) or a phenolic-low (traces of phenolics) control in a crossover design. Analysis by ultra-high performance
liquid chromatography (UPLC)–MS/MS showed that oat bran intake resulted in an elevation in urinary excretion of 30 phenolics relative to the control,
suggesting that they are oat bran-derived. Mean excretion levels were elevated between 0–2 and 4–8 h, following oat bran intake, and amounted to a total of 33.7 ± 7.3 μmol total excretion (mean recovery: 22.9 ± 5.0%), relative to
control. The predominant metabolites included: vanillic acid, 4- and 3-hydroxyhippuric acids, and sulfate-conjugates of benzoic and ferulic acids, which accounted collectively for two thirds of total excretion.
Conclusion: Oat bran phenolics follow a relatively rapid urinary excretion, with 30 metabolites excreted within 8 h of intake. These levels of excretion suggest that bound phenolics are, in part, rapidly released by the microbiota.

Item Type:	Article
Identifier:	10.1002/mnfr.201700499
Keywords:	absorption; avenanthramide; metabolism; oat bran; phenolic acid; whole grains.
Subjects:	Natural sciences > Cell and molecular biology Natural sciences
Depositing User:	Volker Behrends
Date Deposited:	29 Apr 2024 11:26
Last Modified:	04 Nov 2024 11:32
URI:	https://repository.uwl.ac.uk/id/eprint/11470

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