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Short-term depuration reduces the levels of microplastics of a commercial mussel from Eastern Amazon
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Mussels from the Amazon coast were found to contain tiny plastic particles (microplastics) from sources like textile fibers and pigments—meaning people who eat these shellfish are likely swallowing plastic too. The good news: simply letting mussels "depurate," or sit and filter clean water for 72 hours before eating, cut their plastic contamination by more than half, offering a cheap and practical way to reduce your microplastic exposure from seafood.
Consumption of contaminated shellfish can be a pathway of human exposure to microplastics (MPs). Depuration is a treatment step that can effectively reduce the particle content of bivalves; however, this technique is not yet employed for mussels sold in the Eastern Amazon coast, in Brazil. Hence, this study aimed to verify the efficacy of 24 h, 48 h, and 72 h depurations in reducing the MP concentrations of the native mussel Mytella guyanensis. A total of 176 MPs were observed among fibers, fragments, and pellets, with black and blue fibers being predominant, followed by blue fragments. Non-depurated mussels had a significantly higher concentration of MPs per gram of edible weight than mussels from all depuration periods (1.31 ± 1.19 MPs/g). Meanwhile, in the concentration per individual non-depurated mussels (2.17 ± 1.04 MPs/ind) had a significantly higher contamination than mussels depurated for 48 h (1.33 ± 0.67 MPs/ind) and 72 h (0.90 ± 0.78 MPs/ind). Dyed fibers and fragments represented most of the observed MPs (58%), followed by microplastics of different polymers (25%), and cellulose (16%). Among dyes, the textile pigment Indigo and general use phthalocyanines were the most common findings, while PP was the most common microplastic. Our results reveal ample contamination by MPs in mussels that supply markets in the region. Therefore, we infer that depuration is an effective way of reducing the particle content of M. guyanensis, with the potential to reduce the human MP intake by 55-58%, considering a 72-h depuration.
More Papers Like This
Depuration reduces microplastic content in wild and farmed mussels
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Wild and farmed mussels from Guanabara Bay, Brazil were found to contain microplastics, and a 96-hour depuration period significantly reduced but did not fully eliminate microplastic content. The study demonstrates that depuration can reduce microplastic burden in commercially sold shellfish, with important implications for seafood safety.
Microplastics levels in cultured or harvested mollusks non-depurated and commercially depurated at different times
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Researchers measured microplastic levels in three species of commercially available bivalve mollusks at different depuration stages and found that fibers made up over 90% of the detected particles. Standard commercial depuration reduced microplastic content by 26-50% depending on the species, but extending the depuration period did not significantly improve removal rates. The study estimates that annual human consumption of these mollusks results in the ingestion of several meters of microplastic fibers per year.
Microplastic Depuration on Asaphis Detlorata
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This study tested whether soaking shellfish in clean circulating water (a process called depuration) could reduce the microplastics inside them. After 3 to 4 days of depuration, shellfish had significantly fewer microplastic particles. This is relevant to seafood safety because shellfish are a known source of microplastic exposure for people who eat them.
Effectiveness of pre-processing interventions for microplastic reduction in freshwater and coastal bivalves: Insights for seafood safety and pollution mitigation
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Scientists tested ways to remove tiny plastic particles from shellfish like mussels and clams that people commonly eat. They found that letting shellfish sit in clean water for 3 days and removing certain body parts can reduce plastic contamination by up to 69%, but the smallest plastic pieces still remain. This research matters because it shows simple steps seafood processors and consumers can take to reduce the amount of plastic we eat, though it can't eliminate the problem completely.
Bioaccumulation and depuration dynamics of polyester microfibres in Mytilus galloprovincialis
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Scientists tested how mussels—a popular seafood—absorb and get rid of tiny polyester fibers (like those shed from synthetic clothing) at different exposure levels, and found that higher exposure didn't necessarily mean more fibers stayed trapped in the mussels' bodies. Even more notably, the "clean" mussels used as a comparison group already had microplastic fibers in them before the experiment even started, showing just how widespread this contamination already is. This matters because it suggests eating mussels and other shellfish is a likely route for microplastics to enter our diets, even from seafood we assume is uncontaminated.
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