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Unscrambling why plastics aren't detectable in chicken eggs.
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Australian researchers tested chicken eggs from four commercial production systems and backyard hens for seven common plastic polymers and found plastics were not detectable at measurable levels. The study provides reassurance about this food group while also highlighting methodological challenges in detecting microplastics in fatty matrices like egg yolk.
Several food groups have been reported to contain varying concentrations of plastics. This study was designed to quantitatively investigate for the first time in Australia the presence of plastics in store-bought chicken eggs. Three commonly consumed brands of free-range, free-range organic, barn-laid and backyard (home-laid) chicken egg samples were analyzed for seven common polymers (i.e., polypropylene, polyethylene, polyvinyl chloride, polyethylene terephthalate, polystyrene, poly-(methylmethacrylate) and polycarbonate). Samples were extracted by enzyme digestion and pressurized liquid extraction, followed by quantitative analysis through double-shot microfurnace pyrolysis coupled to gas chromatography-mass spectrometry. No plastics were detected at concentrations > limit of detection (LOD) (from 0.04 μg/g for PS to 0.22 μg/g for PVC) in the egg samples analyzed, regardless of brand and category, suggesting limited exposure of Australians to plastics from consuming eggs This study provides valuable baseline data and underscores the importance of continued monitoring to ensure the safety and integrity of food supplies in the face of rising environmental plastic pollution.
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Microplastics contamination in eggs: Detection, occurrence and status
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Researchers detected microplastics in commercially sold chicken eggs for the first time, finding an average of nearly 12 particles per egg. Most particles were spherical polyethylene in the 50 to 100 micrometer size range, and egg yolks contained more microplastics than egg whites, with cooking having no significant effect on the count. The study highlights eggs as another dietary pathway for human microplastic exposure and calls for measures to address contamination in the food supply.
Microplastic pollution in eggs impairs chick development by disrupting yolk sac function and intestinal homeostasis
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Researchers detected microplastics in all commercial chicken eggs tested (average 17 μg/g), confirmed maternal transfer by finding polystyrene and polyethylene in all ovarian follicles, and showed that injecting polystyrene nanoplastics into yolk sacs disrupted yolk sac function and intestinal development in chicks.
Microplastic Contamination in Edible Tissues of Broiler and Free -Range Chickens (Gallus gallus domesticus) from Nigeria: Polymer and Morphological Characterisation Using ATR-FTIR and SEM with Comparison of KOH and Fenton Digestion Protocols
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Researchers found tiny plastic particles, including common types like polyethylene and polystyrene, in the liver, heart, and muscle of chickens sold in Nigeria, with the liver most contaminated. Since chicken is a widely eaten food, this suggests poultry could be a hidden way people are exposed to microplastics, though more research is needed to understand health risks.
Microplastics containing plasticizers affect chicken reproduction via disturbing ovary DNA homologous recombination activity
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Researchers found that microplastics carrying organic plasticizers disrupted chicken reproduction by interfering with hormone signaling pathways, reducing egg production and quality in a combined-exposure study that showed greater harm than either microplastics or plasticizers tested independently.
Harmful impacts of microplastic pollution on poultry and biodegradation techniques using microorganisms for consumer health protection: A review
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This review examines how microplastic pollution affects poultry health and food safety, finding that microplastics have been detected in chicken meat from supermarkets and open markets. Evidence indicates that microplastics can damage vital organs in poultry, reduce egg production, and accumulate in edible tissues. The authors also review biodegradation techniques using microorganisms as a potential strategy for reducing microplastic contamination in the food supply.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.