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Environmental release behavior, cell toxicity and intracellular distribution of novel biodegradable plastic materials
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Researchers tested five types of commercially available biodegradable plastics and found that several still released microplastics and showed significant toxicity to human cells, including liver and intestinal cells. Polylactic acid (PLA), often marketed as an eco-friendly alternative, showed higher environmental mobility and concerning toxic effects. The study also showed that human immune cells actively engulfed and absorbed biodegradable microplastic particles, suggesting that 'biodegradable' does not necessarily mean safe for human health.
In response to the increasingly severe issue of plastic waste, biodegradable plastics have garnered extensive attention as a potential alternative to traditional plastics. Among these materials, biodegradable plastics hold a dominant position. The objective of this study was to assess the environmental risks of five commercially available biodegradable plastics: polyglycolic acid (PGA), polylactic acid (PLA), poly(butylene succinate) (PBS), poly(butylene carbonate) (PBC), and poly(butylene adipate-co-terephthalate) (PBAT). The evaluation included their physical properties, microplastic release behavior, and cytotoxicity. In addition, the effect of age process on the environmental behavior of biodegradable plastic materials was further investigated. The results revealed that PGA and PBS exhibited lower risks in terms of microplastic release, whereas PLA demonstrated higher environmental mobility. Further cytotoxicity experiments indicated that PLA and PBS exerted significant toxic effects on human cell lines, including human normal liver cells (LO2), human monocytic leukemia cells (THP-1), human umbilical vein endothelial cells (HUVECs), and human colon carcinoma cells (Caco-2). Additionally, this study utilized Nile Red labeling to observe the co-culture system of PGA with THP-1 cells, uncovering that THP-1 cells gradually engulfed and internalized PGA microplastics over time. This finding provides new insights into the potential mechanism by which microplastics promote cell proliferation. Moreover, we also found that the aging process partially reduced the cytotoxicity of PGA, but had little effect on environmental mobility. Considering the comprehensive research findings, PGA is considered an ideal material for large-scale applications due to its low cytotoxicity and environmental risks. In contrast, the environmental safety of other types of plastics requires more comprehensive risk assessment to determine their suitability. This study provides significant scientific evidence for the environmental impact assessment of biodegradable plastics and plays a crucial role in promoting the development of sustainable plastic alternatives.
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PLA plastic (a popular "eco-friendly" alternative to regular plastic used in food containers and utensils) can break down when exposed to heat and moisture, potentially releasing tiny plastic particles and chemical byproducts into your food. This review of existing research finds that these released substances have been linked to gut damage, inflammation, and cell stress in lab studies, suggesting that "biodegradable" packaging isn't automatically safer for direct food contact than conventional plastic. The authors argue that current safety rules don't adequately account for this risk and call for stricter testing and better-designed packaging before these products are considered truly saf
The Cytotoxicity of Biodegradable Microplastics and Nanoplastics: Current Status and Research Prospects
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This review summarizes what is currently known about the toxicity of biodegradable micro- and nanoplastics to human cells. Researchers found that outside of industrial composting facilities, biodegradable plastics can persist and fragment into small particles that may be just as harmful as conventional plastic particles. The study highlights that the label "biodegradable" does not necessarily mean these plastics are safer once they break down into micro- and nanoscale fragments.
Multispecies toxicity evaluation of extractable chemicals from commercial biodegradable plastic products
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"Biodegradable" plastics are often marketed as the safer, eco-friendly alternative to regular plastic, but this study found that chemicals leaching from 12 popular biodegradable plastic products can harm plants, marine life, bacteria, and even human skin and liver cells in lab tests. One additive chemical turned out to be even more damaging to human cells than a regulated phthalate (a chemical already known to be harmful) commonly found in conventional plastics. The takeaway: just because a plastic breaks down doesn't mean it's safe—the chemical additives used to make these products may pose their own health risks that need closer test
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.
Polylactic acid synthesis, biodegradability, conversion to microplastics and toxicity: a review
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Researchers reviewed polylactic acid (PLA), a popular plant-based "biodegradable" plastic used in packaging and agriculture, finding that while it breaks down inside the body, it does not fully degrade under natural outdoor or aquatic conditions — and in fact fragments into microplastics faster than conventional petroleum-based plastics. This challenges the assumption that bioplastics are a straightforward environmental solution.
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