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Unscrambling why plastics aren't detectable in chicken eggs.

Anum Tariq1, Elvis D Okoffo2, Angelo Fenti3

  • 1Queensland Alliance for Environmental Health Sciences (QAEHS), The University of Queensland, 20 Cornwall Street, Woolloongabba, QLD, 4102, Australia; College of Earth and Environmental Sciences, University of the Punjab, Lahore, Pakistan.

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Summary

Plastic contamination was investigated in Australian chicken eggs. No plastics were detected in any egg samples, suggesting minimal exposure through this food source.

Keywords:
AustraliaDouble-shot Pyr-GC/MSEnzyme digestionMicroplasticsPoultry birdsQuantification

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Area of Science:

  • Environmental Science
  • Food Safety
  • Analytical Chemistry

Background:

  • Plastic contamination is a growing global concern.
  • Previous studies have detected microplastics in various food items.
  • The presence and levels of plastics in Australian chicken eggs remained unquantified.

Purpose of the Study:

  • To quantitatively assess the presence of seven common polymers in store-bought chicken eggs in Australia.
  • To determine if egg type (free-range, organic, barn-laid, backyard) or brand influences plastic contamination.
  • To establish baseline data on plastic exposure from egg consumption in Australia.

Main Methods:

  • Analysis of egg samples from three common brands across four categories.
  • Extraction using enzyme digestion and pressurized liquid extraction.
  • Quantification via double-shot microfurnace pyrolysis coupled to gas chromatography-mass spectrometry (Py-GC-MS).

Main Results:

  • No plastics were detected in any analyzed egg samples above the established limits of detection (LOD).
  • LODs ranged from 0.04 μg/g for polystyrene (PS) to 0.22 μg/g for polyvinyl chloride (PVC).
  • Plastic detection was independent of egg brand and category.

Conclusions:

  • Chicken eggs in Australia do not appear to be a significant source of plastic exposure.
  • This study provides crucial baseline data for food safety monitoring.
  • Continued surveillance is recommended to address ongoing environmental plastic pollution.