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An in vitro assessment of bioaccessibility of arsenicals in rice and the use of this estimate within a probabilistic exposure model

Journal of Exposure Science & Environmental Epidemiology volume 22, pages 369–375 (2012)Cite this article

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Abstract

In this study, an in vitro synthetic gastrointestinal extraction protocol was used to estimate bioaccessibility of different arsenicals present in 17 rice samples of various grain types that were collected across the United States. The across matrix average for total arsenic was 209 ng/g±153 (x̄±2σ). The bioaccessibility estimate produced an across matrix average of 61%±19 (x̄±2σ). The across matrix average concentrations of inorganic arsenic (iAs) and dimethylarsinic acid (DMA) were 81 ng/g±67.7 and 41 ng/g±58.1 (x̄±2σ), respectively. This distribution of iAs concentrations in rice was combined with the distribution of consumption patterns (from WWEIA) in a Stochastic Human Exposure and Dose Simulator model to estimate population-based exposures. The mean consumption rate for the population as a whole was 15.7 g per day resulting in a 0.98 μg iAs per day exposure. The mean consumption rate for children 1–2 years old was 7 g per day resulting in a 0.48 μg iAs per day exposure. Presystemic biotransformation of DMA in rice was examined using an in vitro assay containing the anaerobic microbiota of mouse cecum. This assay indicated that DMA extracted from the rice was converted to dimethylthioarsinic acid, although a second oxygen–sulfur exchange to produce DMDTA was not observed.

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Acknowledgements

The United States Environmental Protection Agency through its Office of Research and Development funded and managed the research described here. It has been subjected to the Agency's administrative review and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.

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Authors and Affiliations

  1. Student Services Contractor at US EPA, ORD, NERL, MCEARD, Cincinnati, Ohio, USA

    Heather R Trenary, Andrea R Young & Madhavi Mantha

  2. Department of Chemistry, University of Cincinnati, Cincinnati, Ohio, USA

    Heather R Trenary & Joseph A Caruso

  3. US EPA, ORD, NERL, MCEARD, Cincinnati, Ohio, USA

    Patricia A Creed, Carol A Schwegel & John T Creed

  4. US EPA, ORD, NERL, HEASD, Research Triangle Park, North Carolina, USA

    Jianping Xue

  5. US EPA, ORD, NHEERL, ISTD, Research Triangle Park, North Carolina, USA

    Michael J Kohan, Karen Herbin-Davis & David J Thomas

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Trenary, H., Creed, P., Young, A. et al. An in vitro assessment of bioaccessibility of arsenicals in rice and the use of this estimate within a probabilistic exposure model. J Expo Sci Environ Epidemiol 22, 369–375 (2012). https://doi.org/10.1038/jes.2012.24

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