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Raman Spectroscopy Enables Real-Time Identification and Monitoring of Plastic Biodegradation Metabolites
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Scientists are testing bacteria that can "eat" plastic bottles (PET) as a cleaner alternative to traditional recycling, but they needed a better way to watch this process happen in real time. Using a laser-based technique called Raman spectroscopy, researchers discovered the bacteria produce a previously unknown breakdown chemical, revealing that we may have misunderstood how these plastic-eating microbes actually work. This matters because better tools to monitor and optimize plastic biodegradation could eventually lead to more effective ways to reduce plastic waste, potentially curbing the microplastic pollution that ends up in
Abstract Managing plastic pollution is challenging because current physical and chemical recycling methods are inefficient and environmentally intensive. Biological recycling approaches have been framed as sustainable alternatives but are challenging to optimize due to a lack of process analytical technologies that provide real time data on microbial plastic metabolism. In this study we used Piscinibacter sakaiensis 201-F6, a model bacterium with a well-studied polyethylene terephthalate (PET) metabolism, to validate non-destructive Raman spectroscopy methods to monitor plastic biodegradation by tracking metabolite production. Cells were grown on PET and known metabolites stemming from PET metabolism. Raman spectroscopy was used alongside destructive mass spectrometry techniques to monitor PET metabolite production and uptake under different growth conditions. Although cells grew effectively using PET, Raman spectroscopy did not detect the known PET metabolite terephthalic acid during growth assays. Instead, Raman detected isophthalic acid (IPA), a metabolite not previously associated with PET metabolism whose identity was confirmed with LC-HRMS. Raman spectroscopy was also used alongside thermoanalytical techniques to predict the biodegradability of PET at different crystallinities through the release of IPA. This study frames Raman spectroscopy as a promising tool to study metabolic pathways for plastic recycling and optimize their application in situ .
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Raman Microspectroscopy to Trace the Incorporation of Deuterium from Labeled (Micro)Plastics into Microbial Cells.
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Researchers applied stable isotope resonance Raman microspectroscopy at the single-cell level to trace the incorporation of deuterium from labeled (micro)plastics into microbial cells, demonstrating a novel method for tracking microbial degradation of plastics at the cellular level.
Direct monitoring of the enzymatically sequestering and degrading of PET microplastics using hyperspectral Raman microscopy
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Scientists attached a plastic-degrading enzyme to magnetic nanoparticles, creating tiny agents that can capture and break down PET microplastics in water. Using a novel real-time imaging technique, they were able to directly observe the degradation process, demonstrating a promising nanotechnology approach for removing microplastic pollution from water.
Deuterium Labels to Study Biodegradation of Plastics with Raman Spectroscopy
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Researchers used deuterium-labelled biodegradable polymers and Raman spectroscopy to track plastic degradation in soil and water systems, demonstrating that isotopic labelling provides a powerful tool for confirming genuine biodegradation versus simple fragmentation.
OperandoNanocavity-Confined Raman Spectroscopy Uncoversa Drilling-Shearing Mechanism in Nanoplastic Photodegradation
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Scientists used a powerful new microscope technique to watch, in real time, exactly how sunlight-triggered chemical reactions break down individual nanoplastic particles — the tiny plastic fragments increasingly found in our water, food, and even our bodies. They discovered two different molecular "attackers" work together like a drill and a pair of shears: one chews away at the surface while the other cracks the plastic apart from within, speeding up its breakdown. Understanding this mechanism could help researchers design better ways to break down plastic pollution before it becomes the kind of nanoplastic particles that may pose health risks to humans.
Raman microspectroscopy and laser-induced breakdown spectroscopy for the analysis of polyethylene microplastics in human soft tissues
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Researchers developed a combined technique using Raman microspectroscopy and laser-based analysis to detect polyethylene microplastics in human soft tissue samples. The method can identify both the plastic polymer and any associated inorganic elements in tissue. This kind of detection tool is important for understanding whether microplastics accumulate in specific human organs and what health effects they might have.
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