Characterisation of aflatoxin and deoxynivalenol exposure among pregnant Egyptian women

Abstract

Mycotoxins such as the aflatoxins and deoxynivalenol (DON) are frequent contaminants of food. Aflatoxin B1 (AFB1) and DON affect the immune system and restrict growth; additionally AFB1 is carcinogenic. To date there are limited descriptive biomarker data concerning maternal exposures during pregnancy, and none on co-exposures to these mycotoxins. This survey was a cross-sectional assessment providing descriptive data on the concentrations of serum aflatoxin–albumin (AF-alb), urinary aflatoxin M1 (AFM1), and urinary DON for 98 pregnant women from Egypt, in relation to diet and socioeconomic status, during the third trimester. AF-alb was detected in 34 of 98 (35%) samples, geometric mean (GM) of positives = 4.9 pg AF-lys mg⁻¹ albumin (95% confidence interval (CI) = 4.1–5.8 pg mg⁻¹), and AFM1 in 44 of 93 (48%) samples, GM of positives = 19.7 pg mg⁻¹ creatinine (95%CI = 14.8–26.3 pg mg⁻¹). AF-alb and AFM1 levels were positively correlated (R = 0.276, p = 0.007). DON was detected in 63 of 93 (68%), GM of positives = 2.8 ng mg⁻¹ (95%CI = 2.1–3.6 ng mg⁻¹). Aflatoxin and DON biomarkers were observed in 41% of the subjects concurrently. The frequency and level of these biomarkers in Egyptian women were modest compared with known high-risk countries. However, this study represents the first biomarker survey to report on the occurrence of DON biomarkers in an African population, in addition to the co-occurrence of these two potent mycotoxins. This combined exposure may be of particular concern during pregnancy given the potential of toxin transfer to the foetus.

Keywords:

• immunoassays
• exposure
• chromatography – LC/MS
• clean-up – affinity columns
• aflatoxins
• mycotoxins – trichothecenes
• mycotoxins

Acknowledgements

This work was supported by The Academy of Finland (Grant Number 108620), the Finnish Cultural Foundation and Kuopio University Foundation. The research in LIGHT laboratories, University of Leeds, was supported by the Spiros C. Moros Charity Foundation. The authors thank Anne Sutcliffe and Kay White for their technical assistance; and Professor Christopher Wild for collaborative support during this study period at the University of Leeds. S. Piekkola and P.C. Turner contributed equally to this work.