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Reply to the ‘Comment on “Expanded polystyrene is not chemically degraded by mealworms”’ by W.-M. Wu and C. S. Criddle, RSC Sustainability , 2026, 4 , DOI: 10.1039/D5SU00247H
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Researchers rebutted claims that mealworms biodegrade expanded polystyrene, demonstrating that insects fed pure or commercial EPS die faster than starvation controls, shed only frass and microplastics, and leave the polymer's chemical structure chemically unchanged and unassimilated.
EPS ingestion ≠ biodegradation: mealworms and superworms fed pure or commercial EPS die faster than starvation controls, shed only frass + microplastics, and leave the polymer’s chemical structure unchanged and unassimilated.
More Papers Like This
Comment on “Expanded polystyrene is not chemically degraded by mealworms” by Z. M. Tahroudi, G. Flematti, J. Joshi, G. Fritz and R. Atkin, RSC Sustainability , 2025, 3 , 383
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This commentary challenges a study claiming mealworms do not chemically degrade expanded polystyrene, arguing that valid biodegradation conclusions require mass balance analysis and comprehensive analytical methods including gut microbiome, transcriptome, and metabolome characterization rather than limited chemical testing alone.
Expanded polystyrene is not chemically degraded by mealworms
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Previous studies suggested that mealworms could biodegrade expanded polystyrene (EPS), generating interest in insects as a solution to plastic waste. This study challenges those findings, demonstrating that mealworms do not chemically degrade EPS but instead physically fragment it into smaller particles. The results raise concerns that mealworm-based plastic disposal methods may actually produce microplastics rather than breaking down the polymer.
Biodegradation of Polystyrene by Plastic-Eating Tenebrionidae Larvae
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Researchers tested the ability of mealworm (Tenebrio molitor) and superworm (Zophobas morio) larvae to biodegrade polystyrene foam through feeding experiments with different dietary conditions. They found that both species could consume and break down polystyrene, with gut microorganisms playing a key role in the degradation process. The study suggests that insect-based biodegradation could offer a biological approach to addressing polystyrene waste in the environment.
Insect-mediated polystyrene (PS) degradation: Mechanisms, efficiency, ecological impacts, and application prospects
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Polystyrene (a common plastic used in things like foam cups and takeout containers) barely breaks down in nature, letting it pile up in soil and oceans and eventually work its way into our food and bodies as microplastics. This review pulls together research showing that certain insects—like mealworms and waxworms—can actually eat and partially break down this plastic thanks to special bacteria living in their guts, hinting at a possible eco-friendly way to deal with plastic waste. That said, the science is still young: studies vary a lot in methods, so more standardized research is needed before this could become a real-world solution.
Biodegradation of Polystyrene by Plastic-Eating Tenebrionidae Larvae
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Researchers examined the biodegradation of polystyrene by Tenebrionidae beetle larvae, testing the ability of plastic-eating mealworm larvae to break down the highly stable, hydrophobic polymer. The study characterized polymer molecular weight changes, gut microbiome contributions, and metabolic byproducts, demonstrating that larval gut bacteria play a key role in PS depolymerization.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.