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Photoaging of biodegradable nanoplastics regulates their toxicity to aquatic insects (Chironomus kiinensis) by impairing gut and disrupting intestinal microbiota
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This study found that biodegradable PLA nanoplastics become more toxic after aging in sunlight, causing worse gut damage, oxidative stress, and disruption of gut bacteria in aquatic insects than fresh particles. The aging process made the particles smaller and more chemically reactive, enhancing their harmful effects. This challenges the assumption that biodegradable plastics are inherently safer -- once they break down into nanoplastics in the environment, they may actually pose greater health risks.
Biodegradable plastic, a widely used ecofriendly alternative to conventional plastic, easily form nanoplastics (NPs) upon environmental weathering. However, the effects and underlying mechanisms governing the toxicity of photoaged biodegradable NPs to aquatic insects are not understood. In this study, we investigated the photoaging of polylactic acid nanoplastics (PLA-NPs, a typical biodegradable plastic) that were placed under xenon arc lamp for 50 days and 100 days and compared the toxicity of virgin and photoaged PLA-NPs to Chironomus kiinensis (a dominant aquatic insect). The results showed that photoaged PLA-NPs significantly decreased the body weight, body length and emergence rate of C. kiinensis. Additionally, photoaged PLA-NPs induced more severe gut oxidative stress, histological damage, and inflammatory responses than virgin PLA-NPs. Furthermore, the alpha diversity of gut microbiota was lower in photoaged PLA-NPs group than virgin PLA-NPs. The relative abundance of key gut bacteria related to intestinal barrier defense, immunity, and nutrient absorption was reduced more significantly in photoaged PLA-NPs group than virgin PLA, indirectly leading to stronger gut damage and growth reduction. A stronger impact of photoaged PLA-NPs on the gut and its microbiota occurred because photoaging reduced the size of NPs from 255.5 nm (virgin PLA) to 217.1 nm (PLA-50) and 182.5 nm (PLA-100), induced surface oxidation and enhancement of oxidative potential, and improved the stability of NPs, thereby exacerbating toxicity on the gut and its microbiota. This study provides insights into the effects of biodegradable NPs on aquatic insects and highlights the importance of considering biodegradable nanoplastic aging in risk assessments.
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Researchers found that when biodegradable plastics made from PLA/PBAT are aged by sunlight and then exposed to digestive conditions, they release significantly more micro- and nanoplastic particles than non-aged versions. These released particles showed toxicity to intestinal cells, raising important questions about the safety of biodegradable food packaging as it weathers before disposal.
Insights into the Photoaging Behavior of Microplastics: Environmental Fate and Ecological Risk
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This review examines how sunlight ages microplastics in the environment, breaking them into smaller pieces and changing their surface chemistry in ways that make them more toxic and more likely to carry other pollutants. Sun-aged microplastics release dissolved organic matter that can harm aquatic life, and their roughened surfaces attract more bacteria and chemical contaminants. Since most microplastics in nature have been exposed to sunlight, their real-world health risks may be higher than studies using fresh lab plastics suggest.
Photoaging enhanced the adverse effects of polyamide microplastics on the growth, intestinal health, and lipid absorption in developing zebrafish
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Researchers found that polyamide microplastics became significantly more harmful to developing zebrafish after being aged by simulated sunlight, shrinking in size and generating nanoplastic fragments. The aged particles caused greater damage to intestinal health, impaired lipid absorption, and stunted growth compared to unaged microplastics. The study demonstrates that environmental weathering can substantially increase the biological risks posed by microplastics in aquatic ecosystems.
Photoaging of microplastics and nanoplastics: Physicochemical transformations, cellular responses, and toxicological implications
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When plastic waste breaks down in sunlight, it doesn't just become smaller pieces, it actually changes chemically in ways that can make it more toxic to cells, according to this review of existing research. Scientists found that sun-damaged microplastics and nanoplastics are often more harmful to cells than fresh, unweathered plastic particles, though how harmful depends on the plastic type and other conditions. This matters because most plastic pollution in the environment has been sitting in the sun for a while, so real-world exposure may pose greater health risks than lab studies using pristine plastic particles suggest.
Environmental aging alters the toxicity profiles of nanoplastics and generates biologically active soluble products
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Researchers exposed two types of nanoplastics to a year of simulated sunlight to mimic environmental weathering, then tested the aged particles and the soluble byproducts separately. The aged particles caused less liver-related change than fresh plastic, but the soluble byproducts altered blood metabolism and gut bacteria, affecting tissues including gut, liver, and brain.
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