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Validity of plasma phenyl-γ-valerolactones as novel biomarkers of dietary (poly)phenols: Preliminary analysis from the VALID project

Published online by Cambridge University Press:  06 September 2018

B. Parmenter
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
K. Moore
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
D. Angelino
Affiliation:
Human Nutrition Unit, Department of Food and Drug, University of Parma, Italy
D. Del Rio
Affiliation:
Human Nutrition Unit, Department of Food and Drug, University of Parma, Italy
H. McNulty
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
A.M. Molloy
Affiliation:
Trinity College Dublin, University of Dublin, Ireland
C. Cunningham
Affiliation:
Trinity College Dublin, University of Dublin, Ireland
M. Ward
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
B. Pucci
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
H. Jarrett
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
E. Laird
Affiliation:
Trinity College Dublin, University of Dublin, Ireland
J.J. Strain
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
A. Moore
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
C.I.R. Gill
Affiliation:
Nutrition Innovation Centre for Food and Health, Ulster University, Coleraine, BT52 1SA, Ireland
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Abstract

Type
Abstract
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Copyright © The Authors 2018 

Diets rich in (poly)phenols are recognised as having potentially beneficial roles in health and the prevention of chronic diseases(Reference Del Rio, Rodriguez-Mateos and Spencer1). However, linking (poly)phenols with health outcomes is problematic because of their transient appearance in plasma(Reference Spencer, El Mohsen and Minihane2), which limits the development of robust biomarkers of dietary exposure. Measures of phenyl-γ-valerolactones, products of colonic bacterial metabolism of the (poly)phenols (epi)catechin and procyanidin, offer the advantage of being more stable in plasma(Reference Brindani, Mena and Calani3), and may represent novel biomarkers of dietary intake of (epi)catechin and procyanidin-rich foods such as tea, cocoa, grapes, nuts, red wine and berries. The aim of this analysis was to develop and validate plasma phenyl-γ-valerolactones as biomarkers of (epi)catechin and procyanidin-rich diets in a subsample of older adults from the island of Ireland.

This preliminary investigation was conducted as part of the multi-centred VALID project (www.jpi-valid.com) on 346 participants who provided a blood sample and completed an interviewer led (poly)phenol focused food frequency questionnaire. Plasma phenyl-γ-valerolactones were quantified using UHPLC-ESI-MS(Reference Brindani, Mena and Calani3) at the University of Parma, while Phenol-Explorer® was used to estimate dietary intakes of (epi)catechin and procyanidin at Ulster University.

Analysis showed that 3 of a total of 11 phenyl-γ-valerolactones metabolites investigated, namely 5-(3′,4′-dihydroxyphenyl)- γ-valerolactone-3′-O-sulfate (3′4’-DiOH-VL-3′-O-Sulph), 5-(3′,4′-dihydroxyphenyl)-γ-valerolactone-3′-O-glucuronide (3′4’-DiOH-VL-3′-O-Gluc) and 5-(3′,5′-dihydroxyphenyl)-γ-valerolactone-3′-O-glucuronide (3′5’-DiOH-VL-3′-O-Gluc), were detectable in ≥52% of plasma samples and these were examined in relation to corresponding dietary (poly)phenol intake. Participants were classified into tertiles of low, medium and high (poly)phenol intake and the two most predominant phenyl-γ-valerolactones metabolites (3′4’-DiOH-VL-3′-O-Sulph and 3′4’-DiOH-VL-3′-O-Gluc, detected in 95% and 77% of samples, respectively) showed markedly higher concentrations in participants reporting the highest dietary (poly)phenol intakes (Table 1).

Table 1. Relationship of (poly)phenol intake with plasma phenyl-γ-valerolactones status of participants

Data presented as median (x̃, 25th and 75th percentiles). Values within a row with different superscript letters are significantly different (ANOVA, followed by Games-Howell post hoc test). 1Dietary (poly)phenol intake is the sum of (epi)catehin and procyanidins.

These preliminary results indicate that plasma phenyl-γ-valerolactones are potential biomarkers of (epi)catechin and procyanidin rich diets. Their use to monitor dietary (poly)phenols (and change in intake in response to intervention), and thus the potential protective effects of (poly)phenol rich diets on cognitive function in ageing, warrants further investigation.

This project was funded under the Joint Programming Initiative ‘A Healthy Diet for a Healthy Life’ - Biomarkers for Nutrition and Health programme by the Biotechnology and Biological Sciences Research Council (BBSRC; BB/P028225/1).

References

1.Del Rio, D, Rodriguez-Mateos, A, Spencer, JP et al. (2013) Antioxid Redox Signal 18, 18181892.CrossRefGoogle Scholar
2.Spencer, JP, El Mohsen, MM, Minihane, AM et al. (2008) Br J Nutr 99(1), 1222.Google Scholar
3.Brindani, N, Mena, P, Calani, L et al. (2017) Mol Nutr Food Res 61(9).CrossRefGoogle Scholar

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Validity of plasma phenyl-γ-valerolactones as novel biomarkers of dietary (poly)phenols: Preliminary analysis from the VALID project
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