New alkylresorcinol metabolites in spot urine as biomarkers of whole grain wheat and rye intake in a Swedish middle-aged population

Subjects

Abstract

Background/objectives

Studies on the health effects of whole grains typically use self-reported intakes which are prone to large measurement errors. Dietary biomarkers that can provide an objective measure of intake are needed. New alkylresorcinol (AR) metabolites (3,5-dihydroxycinnamic acid (DHCA), 2-(3,5-dihydroxybenzamido)acetic acid (DHBA-glycine) and 5-(3,5-dihydroxyphenyl) pentanoic acid (DHPPTA)) in 24 h urine samples have been suggested as biomarkers for whole grain (WG) wheat and rye intake but remain to be evaluated in spot urine samples.

Subjects/methods

The reproducibility of the new AR metabolites (DHCA, DHBA-glycine and DHPPTA) was investigated in 4 repeated samples over a period of 2 wk in spot urine from 40 Swedish men and women enroled in the SCAPIS-study, after adjustment of creatinine. Metabolite concentrations were correlated with total whole grain intake estimated during the same period.

Results

The medium-term reproducibility determined for DHCA, DHPPTA and DHBA-glycine varied from moderate to excellent (intra-class correlation coefficient = 0.35–0.67). Moreover, DHCA and DHBA-glycine were independently associated with self-reported total WG intake (β = 0.18, P = 0.08 and β = 0.18, P = 0.02, respectively) and all metabolites except for DHPPA were higher among women.

Conclusions

This study supports the idea of using AR metabolites in one or several spot urine samples as biomarkers of whole grain intake. These findings need to be confirmed in different populations.

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Acknowledgements

We would like to thank Ms Janicka Nilsson for excellent technical assistance with the analysis of alkylresorcinol metabolites. Collection of data and samples for the present study was supported by Region Skåne and Albert Påhlsson Research Foundation. SCAPIS is supported by the Swedish Heart and Lung Foundation, the Knut and Alice Wallenberg Foundation, the Swedish Research Council and VINNOVA. The SCAPIS pilot study was supported by funding from Sahlgrenska Academy at Gothenburg University and strategic grants from ALF/LUA in Western Sweden. Analysis of alkylresorcinol metabolites was supported by grants from Formas and VR-medicine. No funder had any role in the design, analysis or writing of this article.

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SN, AW, AKL, HBF designed and conducted the diet sub-study within SCAPIS Pilot and provided data and samples; BH provided essential databases; RW analyzed alkylresorcinol metabolites in urine samples; LS performed statistical analysis; RL conceived the study together with HBF, supervised sample and statistical analysis and wrote the paper. AKE provided valuable scientific input.

Corresponding author

Correspondence to Rikard Landberg.

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Landberg, R., Wierzbicka, R., Shi, L. et al. New alkylresorcinol metabolites in spot urine as biomarkers of whole grain wheat and rye intake in a Swedish middle-aged population. Eur J Clin Nutr 72, 1439–1446 (2018). https://doi.org/10.1038/s41430-017-0079-5

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