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Rapid and sensitive detection of nanoplastics via dual-positive-charged AIEgens: A simple filtration-assisted approach for environmental detection
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Scientists have developed a new, fast, and highly sensitive test that can detect tiny plastic particles called nanoplastics in water within seconds, using special glowing molecules that stick to the plastic and light up. This matters because nanoplastics are so small they can potentially get into our bodies through food and water, but until now they've been hard to detect and measure—this new tool could help researchers track contamination in everyday items like water bottles and food packaging, which is a key step toward understanding and reducing our exposure to these pollutants.
Nanoplastics (NPs) have emerged as ubiquitous environmental contaminants with significant bioaccumulation potential, necessitating the development of rapid and sensitive detection methods. However, conventional fluorescent probes often suffer from limited water solubility, slow response kinetics, and poor adaptability to complex matrices. In this study, we report two novel quaternized aggregation-induced emission (AIE) probes, TPE-Hyd-PyQuat-6 and TPE-CN-PyQuat-6, engineered through precise modulation of charge density and molecular flexibility. The introduction of quaternized moieties imparts excellent water solubility and high-density positive charge centers. Zeta potential analysis confirmed an electrostatic-driven capture mechanism, where the binding of probes to negatively charged NPs (PS NPs, -22.37 mV) resulted in a distinct charge inversion (up to +9.51 mV). Both probes exhibited ultra-fast response times (5-20 s) and large Stokes shifts (119-136 nm) in purely aqueous systems, effectively eliminating background interference following simple filtration and sonication. Specifically, TPE-CN-PyQuat-6 demonstrated superior sensitivity (LOD = 0.029 mg/L). TPE-CN-PyQuat-6 maintains detectable fluorescence across the pH range of 2.0-14.0, whereas TPE-Hyd-PyQuat-6 exhibits optimal response under neutral to weakly alkaline conditions (pH 6.86-9.18), while TPE-Hyd-PyQuat-6 offered enhanced binding stability facilitated by the hydrogen-bonding sites of the CN linkage. The platform was successfully applied to detect NPs in food-contact material leachates and natural water bodies, providing a versatile strategy for the design of high-performance sensors for nanoscale environmental pollutants.
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Scientists developed a fast, sensitive test that uses glowing dyes to detect tiny plastic particles (nanoplastics) in water, particles so small that older methods often miss them. This matters because nanoplastics may pose health risks we're still working to understand, and better detection tools help us track contamination in drinking water and evaluate cleanup methods. In fact, the researchers also tested a simple protein (casein) that removed 94% of nanoplastics from water, offering a promising step toward practical solutions.
A photoluminescence strategy for detection nanoplastics in water and biological imaging in cells and plants
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Researchers developed a fluorescent probe that can rapidly detect nanoplastics in water samples down to very low concentrations. The probe works by binding to nanoplastic surfaces through electrical and chemical interactions, which causes it to glow, enabling both detection and visual tracking in cells and plant tissues. This tool could help scientists better monitor nanoplastic contamination in water and understand how these tiny particles move through living organisms.
Selective Recognition and Portable Quantification of PVC Microplastics Using a Water-Soluble AIE Fluorescent Probe
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Scientists created a special glow-in-the-dark dye that lights up specifically when it touches PVC microplastics—a common but concerning type of plastic pollution—in water samples like tap water, lake water, and even seawater. This matters because right now it's hard to quickly identify which type of microplastic is contaminating our water, and this simple test could help researchers track PVC pollution (which can release harmful chemical additives) more easily, without needing complicated lab equipment. While this study focused on detection technology rather than health effects directly, better tools like this are an important step toward understanding and monitoring our exposure to potentially harmful plastics
A Rapid One-step Field-based Detection Method for Nanoplastics in Water
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Scientists have created a fast, portable test that can detect nanoplastics (plastic particles too small to see) in water in just 10 minutes, using a special dye and a compact device. This matters because right now it's hard to know where nanoplastic pollution is coming from or how much is in our water supplies, this tool could help track contamination in wastewater and rivers, which is an important step toward understanding and reducing our exposure to these tiny particles.
Adsorption-Based Aggregation-Induced Emission on Nanoparticles: A Promising Strategy for Generic Homogeneous Fluorescence Assay Platforms
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Scientists developed a new light-based sensing method that lights up when it detects tiny particles, making it easier to spot things like nanoplastics in water and dopamine in the body using a simple "mix-and-measure" test. This matters because current methods for detecting nanoplastics can be slow or complicated, and a faster, simpler test could help researchers better track how much of this pollutant is in our water—an important step given growing concerns about microplastics' potential effects on human health.
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