PHA Microplastic Aging Decreases N₂O Sink Capacity: Released γ-Butyrolactone Decouples Denitrifying Electron Transfer and Oxidative Phosphorylation

Environmental Science & Technology, Год журнала: 2025, Номер 59(2), С. 1298 - 1307

Опубликована: Янв. 9, 2025

Bacterial denitrification is a main pathway for soil N2O sinks, which crucial assessing and controlling emissions. Biobased polyhydroxyalkanoate (PHA) microplastic particles (MPs) degrade slowly in conventional environments, remaining inert extended periods. However, the impacts of PHA aging on bacterial sink capacity before degradation remain poorly understood. Here, model strain Paracoccus denitrificans was exposed to 0.05-0.5% (w/w) virgin aged MPs. Although no significant changes molecular weights were observed, MPs hindered cell growth reduction rates, leading surge 1H NMR spectroscopy UPLC-QTOF-MS analysis identified γ-butyrolactone as key component released from Metabolic verifications at cellular level confirmed its inhibition ATP synthesis. The that protonated hydrolyzed spontaneously periplasm would compete protons with ATPase destroy coupling between denitrifying electron transfer oxidative phosphorylation. Consequently, energy-deficient cells reduced supply reduction, did not contribute energy conservation. This work unveils novel mechanism by impairs highlights need consider environmental risks posed biobased aging.

Язык: Английский

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Synthesis, Modification, and Applications of Poly(vinyl chloride) (PVC)

Polymer-Plastics Technology and Materials, Год журнала: 2024, Номер unknown, С. 1 - 40

Опубликована: Ноя. 1, 2024

One of the polymers with biggest production volume is poly(vinyl chloride) (PVC) considering their versatility, durability, lightweight, as well low cost production, plastics have recently become an essential part everyone's daily life. However, increased and usage poses significant environmental problems because incomplete utilization, a lengthy biodegradation period, detrimental effects on living things. This study examines latest findings in PVC research, including its properties, polymerization, modification, recycling, diverse applications. It has been proposed that during along application both inorganic organic thermal stabilizers, can mitigate some basic limiting characteristics PVC. chemistry extended by vast continuous study, mainly chemical transformations this polymeric material. describes modification using different materials active modifying agent. The latter included substitutions, modifications, nucleophilic radicals, removal or dehydrochlorination, grafting polymerizations. PVC's consequences are examined, overview functionalization provided article, discussion main reactivity trends lens recycling.

Язык: Английский

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Long-Term Exposure to Environmentally Realistic Doses of Starch-Based Microplastics Suggests Widespread Health Effects

Journal of Agricultural and Food Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Апрель 9, 2025

There is a growing consensus on addressing the global plastic pollution problem by advocating for bioplastics. While starch-based plastics are prevalent, potential health implications of microplastics (SMPs) remain largely unexplored. This particularly concerning given their accidental ingestion and subsequent interference with blood glucose metabolism. Our research provides first investigation into distribution adverse effects long-term exposure to environmentally relevant doses SMPs in female mice, approximately 14-81 particles per mouse day. After three months exposure, were found infiltrate liver, intestine, ovarian tissues, causing microstructural lesions. Exposure also resulted elevated levels, increased hepatic oxidative stress, disrupted lipid A multiomics analysis further uncovered abnormalities gene expression microbiota, as well enriched pathways related insulin regulation circadian rhythms exposed mice. results indicate that prolonged can have widespread potentially disrupting inducing resistance. suggests safety bioplastics requires evaluation before large-scale application food packages.

Язык: Английский

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Stimulation of Batch Mesophilic Anaerobic Digestion by Cellulose- and Polysaccharide-Derived Polymers in Landfill Leachates

Energies, Год журнала: 2024, Номер 17(21), С. 5384 - 5384

Опубликована: Окт. 29, 2024

The fate of biobased and biodegradable cellulose-derived plastics in landfills represents an important topic from economic environmental points view. Anaerobic digestion is a cost-effective waste-to-energy technology. behaviour six polymer types—that is, cellulose (C), acetate (CA), viscose (V), nanocellulose (NC), textile (AT), heteropolysaccharide pectin (P)—was studied under anaerobic batch mesophilic conditions landfill leachate for 147 days. cumulative biogas production was as follows: C>V=CA>>AT>>NC=P. Metagenomic analysis revealed notable variations the proportion bacterial archaeal domains with highest abundance presence CA (80.2%) C (78.5%). At end digestion, cellulolytic, hydrolytic, dehydrogenase activities were measured intact samples, well liquid solid fractions, aerobic conditions. Cellulolytic activity P detected only pellet, while NC, mostly supernatant both Scanning electron microscopy confocal scanning laser showed defragmentation degradation polymeric substrates microbial colonisation. Based on results, appropriate biodegradation polymers; however, process specific.

Язык: Английский

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Comprehensive understanding of microplastics in compost: Ecological risks and degradation mechanisms

The Science of The Total Environment, Год журнала: 2024, Номер 958, С. 178104 - 178104

Опубликована: Дек. 17, 2024

Язык: Английский

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