Unraveling the prevalence of zearalenone biomarkers of exposure in the Portuguese population: an elaborate biomonitoring study

Martins, Carla; Vidal, Arnau; De Boevre, Marthe; Nunes, Carla; Torres, D.; Goios, Ana; Lopes, Carla; Assunção, R.; Alvito, P.; De Saeger, Sarah

http://hdl.handle.net/10400.18/5741

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Zearalenone (ZEN) is a mycotoxin that occurs widely in food commodities with particular incidence in cereals. Due to chemical structures similar to the endogenous estrogen 17-β-estradiol, ZEN and its metabolites exert estrogenic toxicity. Therefore, it is crucial to assess ZEN exposure among the population. Biomarker-driven research appeared as a promising method to assess the mycotoxin exposure in humans. For this reason, ZEN metabolites such as α-zearalenol (α-ZEL), β-zearalenol (β-ZEL), α-zearalenal (α-ZAL), β-zearalenal (β-ZAL), zearalanone (ZAN) (phase I) and the glucuronides ZEN14GlcA, α-ZEL14GlcA and β-ZEL14Glc (phase II) were identified in biological fluids. With a potency factor of 60 relative to ZEN, α-ZEL is the most relevant metabolite in terms of human health. ZEN is characterized by a fast metabolism and excretion, therefore urine is the matrix commonly used to assess the exposure to this mycotoxin and its metabolites. To date, in Portugal, there is a lack of human studies to assess biomarkers of exposure to ZEN. In the Scope of National Food, Nutrition, and Physical Activity Survey of the Portuguese General Population (2015-2016), 94 participants collected 24h-urine samples, and performed non-consecutive dietary assessments (two 24-hour recalls, 8-15 days apart). Following a salt-assisted matrix extraction, urine samples were analyzed using LCMS/MS for the simultaneous determination of ZEN, α-ZEL, β-ZEL, α-ZAL, β-ZAL, ZAN and ZEN14GlcA. ZEN and ZEN-14-GlcA were detected in 52% (36/69) and 14% (10/69) of the analyzed samples, with a mean concentration of 1.2 and 6.9 μg/L, respectively. The metabolites α-ZEL, β-ZEL, α-ZAL, β-ZAL, ZAN were not detected in the urine samples. Considering the 24h-urinary volume, the mean dietary excretion of ZEN and ZEN-14-GlcA was 1.5 and 7.8 μg/day, respectively. The present biomonitoring study generates reliable data regarding the exposure of the Portuguese population to ZEN. These data are crucial to perform a more realistic risk assessment, contributing to the knowledge of factors that may be associated with this exposure.