Edible clay inclusion in the diet of oysters can reduce tissue residues of polychlorinated biphenyls

Abstract

Objective

Polychlorinated biphenyls (PCBs) are lipophilic and persistent environmental pollutants that are readily absorbed and accumulated in high concentrations in fatty tissues of humans and animals. Invertebrate animals, such as oysters, are vulnerable and sensitive to PCB contamination.

Methods

Previously, our in vitro isothermal studies have shown that acid processed montmorillonites (APM) can effectively bind PCBs and Aroclors. Therefore, in a novel application of this work, a dietary strategy for shellfish was developed using APM, and its parent clay to reduce exposures to PCBs in oysters. PCB residues in oysters with clay treatment at different dietary inclusion rates and durations were measured and compared to a washout treatment.

Results

The efficacy and safety of this strategy were supported by a significant reduction of PCB residues with the inclusion of a low level of APM (0.05%) during a 4-day treatment. Moreover, this sorbent strategy reduced PCB residues in oysters in a dose- and time-dependent manner.

Conclusions

Based on our results, it is possible that clay-based sorbents such as APM, can be included in the diet to significantly reduce exposures to PCBs.

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Acknowledgements

This work was supported by the Superfund Hazardous Substance Research and Training Program (National Institutes of Health) (P42 ES0277704); and the United States Department of Agriculture (Hatch 6215).

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Correspondence to Timothy D. Phillips.

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Meichen Wang and Timothy Phillips declare that they have no conflicts of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Wang, M., Phillips, T.D. Edible clay inclusion in the diet of oysters can reduce tissue residues of polychlorinated biphenyls. Toxicol. Environ. Health Sci. 12, 355–361 (2020). https://doi.org/10.1007/s13530-020-00058-2

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Keywords

  • Toxicant sorption
  • Oysters
  • Polychlorinated biphenyls (PCBs)
  • Clay