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Dynamic Filtering Approach for the Online Preconcentration of Nanoplastics Using Capillary Electrophoresis
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Scientists have developed a new lab technique that acts like a molecular filter, making it 10 times easier to detect tiny plastic particles called nanoplastics—which are smaller than a micrometer and too small for many current tests to reliably catch. This matters because nanoplastics are showing up in water and food, and being able to accurately measure how much is actually present is a critical first step toward understanding their potential health risks. This study is a proof-of-concept for the detection method itself, not a study of health effects.
Nanoplastics, defined as plastic particles <1 μm in diameter, are increasingly recognized as chemicals of concern due to their demonstrated toxicity, which scales with concentration. Conventional analytical techniques for quantifying nanoplastics often exhibit limits of detection (LODs) above environmentally relevant concentrations. This motivates the development of new preconcentration strategies to enable more effective analysis by improving detectivity. Here, we present a novel dynamic filtration approach for the online preconcentration of polystyrene nanoplastics using entangled polymers in capillary electrophoresis (CE). The method employs a large-volume injection of dilute analyte followed by the introduction of a short plug of entangled poly vinyl alcohol (PVA) at concentrations where the entangled polymer effective pore size is significantly smaller than the diameter of the nanoplastics in the sample. Nanoplastics, whose diameters are significantly larger than the entangled polymer mesh size would be restrained from entering the pores, while buffer components pass through. Using this approach, polystyrene nanoplastics with varying surface chemistries were preconcentrated 10-fold, greatly enhancing detectivity and improving LOD relative to conventional CE and previously reported Raman-based methods. The applicability of the technique was further applied to mixtures of nanoplastics, and particles in complex environmental matrices. Overall, dynamic filtering followed by CE is a promising technique for the preconcentration and analysis of nanoplastics in environmental samples.
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Scientists have developed a cheap, easy-to-use filter that can catch and detect tiny plastic particles—down to 1/1000th the width of a human hair—in water, including tap water. This matters because nanoplastics are so small they can potentially slip into our bodies through drinking water, but current detection tools are often too expensive or complicated for widespread use. This new sponge-like membrane could make it much more practical to monitor how much plastic contamination is actually in the water we drink.
Trapping and Detecting Nanoplastics Using Metal–Phenolic Networks–Functionalized Membranes with SERS
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Scientists have developed a cheap, easy-to-use filter that can catch and detect even the tiniest plastic particles (as small as 50 nanometers—much smaller than a human cell) in water, including tap water. This matters because nanoplastics are so small they're hard to detect with current tools, yet they may be small enough to enter our bloodstream and organs, so better detection methods are a key step toward understanding and controlling our exposure to these pollutants.
Microfluidic Size Exclusion Chromatography for Sustainable Nanoplastic Detection
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Researchers developed a miniaturized filtration system using a mix of chitosan and agarose beads to capture and identify nanoplastics — plastic particles smaller than one micrometer — from water samples. The system works with multiple analysis tools including Raman spectroscopy and electron microscopy, offering a cost-effective and sustainable approach to detecting nanoplastics in the environment.
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Researchers developed a nanoporous membrane filter cascade system capable of size-selective analysis of plastic particles spanning from microplastic dimensions down to 10 nm nanoparticle dimensions, addressing the challenge of analyzing nano- and microplastics across several orders of magnitude in particle size for drinking water and food chain health impact studies.
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Researchers developed a miniaturized electrical extraction technique that concentrates nanoplastics from liquid samples across a thin oil membrane using an electric field, then analyzes them using capillary electrophoresis. The method achieved over 20-fold concentration of nanoplastics in just 5 minutes and successfully removed interfering compounds from tea samples, offering a fast and sensitive tool for detecting nanoplastics in complex real-world liquids.
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