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Unlocking Self-Luminescence of Pyrene-Based Metal–Organic Gel for Sensitive Electrochemiluminescence Assay of Microplastics
Original title: Unlocking Self-Luminescenceof Pyrene-Based Metal–OrganicGel for Sensitive Electrochemiluminescence Assay of Microplastics
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Scientists have created a new light-based sensor that can detect tiny amounts of microplastics (like PVC and polystyrene) in water, using a specially designed glowing material that's over three times more sensitive than before. This matters because microplastics are increasingly found in our environment and bodies, and having a fast, ultra-sensitive tool to detect them could help researchers and regulators better track this pollution and understand its health risks.
Pyrene (Py), an archetypal electrochemiluminescence (ECL) luminophore, suffers from inherent aggregation-caused quenching (ACQ) stemming from its planar π-conjugated structure and consequent intermolecular π–π stacking, severely restricting its practical utility. Herein, a gel confinement-induced emission enhancement (GCIEE) strategy is proposed to circumvent this limitation. At room temperature, 1,3,6,8-tetrakis(p-benzoic acid)pyrene (H4TBAPy) underwent a coordination reaction with Tb3+ to rapidly construct a Py-based metal–organic gel (Py-MOG). The rigid coordination framework of Py-MOG imposed spatial confinement on Py ligands, effectively suppressing their detrimental ACQ effect and thereby dramatically boosting the ECL efficiency. Significantly, the as-prepared Py-MOG exhibited a strong and stable ECL emission at −1.65 V without coreactants, and its ECL efficiency achieved a 3.39-fold enhancement relative to the H4TBAPy monomer. As a proof of concept, microplastics (MPs), a kind of persistent micropollutants that threaten ecosystems and human health even at trace levels due to their bioaccumulation and toxicity, were selected as the model target for evaluating the application of Py-MOG in ECL sensing. By coupling Py-MOG with an aptamer recognition-initiated Cas12a thrusting strand displacement reaction (CtSDR) amplification, a biosensor was constructed for the sensitive detection of polyvinyl chloride (PVC) and polystyrene (PS), displaying the limits of detection of 5.2 μg/L for PVC and 7.5 μg/L for PS, respectively. The GCIEE strategy provides a rapid, simple, and novel method to significantly improve the ECL efficiency of Py-based luminophores. The self-luminous Py-MOG establishes an ultrasensitive ECL platform for MPs detection without exogenous coreactants.
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Unlocking Self-Luminescence of Pyrene-Based Metal–Organic Gel for Sensitive Electrochemiluminescence Assay of Microplastics
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Scientists have developed a new light-based sensor that can detect tiny amounts of microplastics (like PVC and PS, common in plastic products) in water, even at very low levels. This matters because microplastics can build up in our bodies and may pose health risks, so having a fast, sensitive way to spot them could help track and reduce our exposure. The technology works by cleverly boosting a glowing molecule's brightness, making the test far more sensitive than previous methods—without needing extra chemicals to trigger the glow.
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