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Bioplastic leachates characterization and impacts on early larval stages and adult mussel cellular, biochemical and physiological responses
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"Bioplastics" marketed as eco-friendly alternatives to regular plastic aren't necessarily harmless: when researchers soaked bioplastic products like compostable bags and cups in water, the chemicals that leached out, including the hormone-disrupting compound BPA, harmed mussel eggs, larvae, and adult mussels' immune and detox systems. This matters because these same waterways feed into our seafood supply, and it suggests that switching to bioplastics doesn't automatically solve the pollution and health risks posed by conventional plastics, more testing is needed before we assume they're truly safer.
Bioplastics are promoted as safer alternatives to tackle the long-term persistence of conventional plastics. However, information on the potential release of additives and non-intentionally added substances (NIAS) in the surrounding environment is limited, and biological effects of the leachates have been little studied. Leachates produced from three bioplastics, i.e. compostable bags (CB), bio-polyethylene terephthalate bottles (bioPET) and polylactic acid cups (PLA), and a control polymeric material, i.e. rubber tire (TR), were examined. The chemical nature of bioplastic polyesters PET, PLA and poly (butylene adipate-co-terephthalate) (PBAT) in CB, was confirmed by analytical pyrolysis. Fragments were incubated in artificial sea water for 14 days at 20 °C in darkness and leachate contents examined by GC-MS and HPLC-MS/MS. Catalysts and stabilizers represented the majority of chemicals in TR, while NIAS (e.g. 1,6-dioxacyclododecane-7,12-dione) were the main components of CB. Bisphenol A occurred in all leachates at a concentration range 0.3-4.8 μg/L. Trace metals at concentrations higher than control water were found in all leachates, albeit more represented in leachates from CB and TR. A dose response to 11 dilutions of leachates (in the range 0.6-100%) was tested for biological effects on early embryo stages of Mytilus galloprovincialis. Embryotoxicity was observed in the whole range of tested concentrations, the magnitude of effect depending on the polymers. The highest concentrations caused reduction of egg fertilization (CB, bioPET, TR) and of larvae motility (CB, PLA, TR). TR leachates also provoked larvae mortality in the range 10-100%. Effects on adult mussel physiology were evaluated after a 7-day in vivo exposure to the different leachates at 0.6% concentration. Nine biomarkers concerning lysosomal functionality, neurotransmission, antioxidant and immune responses were assessed. All lysosomal parameters were affected, and serum lysozyme activity inhibited. Harmonized chemical and biological approaches are recommended to assess bioplastic safety and support production of sustainable bioplastics.
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Effects of primary leachates of conventional and alternative plastics in Cyprinodon variegatus fish larvae: Endocrine disruption and toxicological responses
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Researchers exposed marine fish larvae to chemical leachates from both conventional and so-called eco-friendly plastics and measured the biological effects. They found that leachates from two alternative bioplastics caused complete larval mortality, while bag leachates from all tested materials disrupted hormonal and metabolic defense pathways. The study suggests that biodegradable plastics are not necessarily safer for marine life than conventional ones.
Leachate from microplastics impairs larval development in brown mussels
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Researchers investigated the toxic effects of chemical leachate from microplastics on brown mussel larvae, rather than direct ingestion effects. The study found that substances leaching from microplastic particles impaired larval development, indicating that microplastics can cause harm even without being physically consumed by marine organisms.
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This review of existing research found that bioplastics—supposedly eco-friendly alternatives to regular plastic—may not be as safe as promised. These "green" plastics can still break down into harmful microplastics and leak toxic chemicals, potentially affecting human health just like conventional plastics. The study shows we need better testing and disposal systems before bioplastics can truly be considered a safer choice for people and the environment.
How harmless are alternative bioplastics? A review of their toxicological outcomes in aquatic organisms.
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"Bioplastics" and "biodegradable plastics" are often marketed as eco-friendly swaps for regular plastic, but this review of existing research found they can harm aquatic animals just as much, or even more, than traditional plastics, causing problems like organ damage, reproductive issues, and cellular stress in fish and other water-dwelling creatures. This matters because these materials are increasingly common in packaging and consumer goods, yet scientists still don't know enough about how they affect human health, so "green" labeling doesn't necessarily mean "safe." More research is urgently needed before we assume these alternatives are truly better for us
Bio-based microplastic polylactic acid exerts the similar toxic effects to traditional petroleum-based microplastic polystyrene in mussels
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Researchers exposed mussels to bio-based polylactic acid (PLA) microplastics and traditional polystyrene microplastics and found that both caused similar levels of harm, including oxidative stress, immune disruption, and impaired feeding and respiration. PLA is often promoted as an eco-friendly alternative to conventional plastics, but this study shows it poses comparable ecological risks once it breaks down into microplastics in the ocean. The findings suggest that switching to biodegradable plastics alone will not solve the marine microplastic problem.
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