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In vivo and in vitro degradation and biological toxicity studies of polyesters with varying degradation rates
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This study compared how biodegradable plastics and conventional plastics break down inside living organisms and their toxic effects. Biodegradable polyesters like PGA broke down faster in mice and released fewer harmful particles than non-biodegradable PET, causing less inflammation and organ damage. The findings suggest that switching to truly biodegradable plastics could reduce health risks from microplastic exposure, though more research is needed on the safety of their breakdown products.
The fragmentation of biodegradable plastics into "degradable particles" is an essential step during their degradation process. Investigating their in vivo degradation behaviors and toxicity differing from microplastics holds significant implications. In this study, we selected biodegradable polyesters with distinct degradation rates-polyglycolic acid (PGA) and its copolymer poly(butylene succinate-co-glycolate) (PBSG)-alongside non-biodegradable polyethylene terephthalate (PET) as a control. Using combined in vitro simulations and animal experiments, we assessed their degradation in simulated body fluid (SBF), simulated gastric fluid (SGF), simulated intestinal fluid (SIF) and toxicity effects on rat body weight and multiple organs (heart, liver, spleen, stomach, lung, kidney, colon, brain). Results showed PET exhibited negligible degradation and the highest biotoxicity. After 18 weeks, PGA demonstrated degradation rates of 53.28 % (SBF), 96.35 % (SGF), and 76.14 % (SIF), while PBSG degraded at 7.98 %, 10.28 %, and 10.42 %, respectively. Biodegradable plastics caused no significant toxicity at low doses. However, high doses induced weight loss, tissue necrosis and inflammation in rats. Notably, PGA-with the fastest degradation-showed the weakest physiological toxicity. These findings highlight the important relationship between the degradation rate of biodegradable plastics and their biotoxicity, and can guide the development of new materials to balance environmental benefits and minimized health risks.
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Polylactic Acid Microplastics Do Not Exhibit Lower Biological Toxicity in Growing Mice Compared to Polyvinyl Chloride Microplastics
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Researchers compared the health effects of biodegradable polylactic acid microplastics to conventional polyvinyl chloride microplastics in growing mice over six weeks. Contrary to expectations, the biodegradable microplastics caused equal or more severe harm, including greater disruption of gut bacteria, stronger inflammatory responses, and more intestinal damage. The study suggests that biodegradable plastics may not be safer than conventional plastics once they break down into microplastic-sized particles.
Insights into mouse metabolic health and gut microbiota responses to conventional and biodegradable microplastics released from plastic food containers
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Researchers compared how conventional polyethylene and biodegradable polylactic acid microplastics from food containers affect mice over four weeks. They found that both types disrupted lipid metabolism and increased harmful gut bacteria, but the biodegradable PLA microplastics actually caused more severe metabolic disruption than conventional polyethylene. The study suggests that biodegradable plastics may not be safer than traditional plastics when it comes to microplastic exposure from food packaging.
Hazard assessment of airborne and foodborne biodegradable polyhydroxyalkanoates microplastics and non-biodegradable polypropylene microplastics
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A mouse study compared biodegradable PHA plastic particles to conventional polypropylene microplastics and found both types caused harm to the lungs, liver, and gut when inhaled or eaten. However, the biodegradable PHA particles caused notably less damage than polypropylene, suggesting that while biodegradable plastics are not harmless, they may pose lower health risks than traditional plastics.
Biodegradable Microplastics: Environmental Fate and Persistence in Comparison to Micro- and Nanoplastics from Traditional, Non-Degradable Polymers
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This review compares biodegradable microplastics with traditional microplastics and finds that while biodegradable versions break down much faster, they still release microplastic-sized particles that can persist in the environment for varying periods. How quickly biodegradable microplastics actually disappear depends heavily on environmental conditions like temperature, moisture, and microbial activity, and lab results often overestimate real-world degradation. The takeaway is that switching to biodegradable plastics helps but does not fully solve the microplastic pollution problem.
Combining nanoplastics characterization and metabolomic approach to assess polymers biodegradation
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This study combined nanoplastic characterization techniques with a metabolomics approach to assess how well biodegradable polymers actually break down in the environment, examining metabolic signatures of degradation. Understanding the true biodegradation rate of plastics marketed as biodegradable is essential for evaluating their environmental benefit over conventional persistent plastics.
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.