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Evaluation of Representative Tannin-Containing Beverage Matrices for Rapid Smartphone-Based Microplastic Detection Using a Plant-Derived Optical Assay
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Scientists tested whether a smartphone-based tool for spotting microplastics could work in everyday drinks like coffee, wine, tea, and juice—beverages that contain natural plant compounds (tannins) which can sometimes interfere with detection methods. The tool successfully told apart clean samples from ones spiked with microplastics across all these drinks, though it worked at different speeds depending on the beverage. This is an early but promising step toward cheap, easy at-home testing that could one day help people check their food and drinks for microplastic contamination, a growing concern given questions about how these tiny plastic particles might affect our bodies.
Tannin-containing beverages represent chemically diverse matrices with varying concentrations of polyphenols that may influence optical analytical methods. This technical note evaluates proof-of-concept compatibility of a rapid smartphone-based microplastic detection platform across representative tannin-rich beverage matrices, including medium-roast coffee, red wine, grape juice, cranberry juice, black tea, and green tea. Representative samples were evaluated before and after addition of known microplastic particles following adaptive matrix preparation. Qualitative optical differences between control and microplastic-spiked samples remained observable across all tested matrices, with variations in response kinetics noted between different tannin sources. These findings support the feasibility of extending rapid optical microplastic detection to beverages with differing tannin content and complement previous environmental and biological matrix studies. Liquid Representative Observation Filtered water Clear differentiation between control and microplastic-spiked samples Medium-roast coffee Differentiation between control and microplastic-spiked samples maintained in this representative tannin-containing coffee matrix Red wine (Cabernet) Differentiation between control and microplastic-spiked samples maintained in this high-tannin fermented beverage matrix (relatively fast response) Grape juice Differentiation between control and microplastic-spiked samples maintained in this tannin-containing fruit juice matrix (slower kinetics than red wine) Cranberry juice Differentiation between control and microplastic-spiked samples maintained in this tannin-containing fruit juice matrix Black tea Differentiation between control and microplastic-spiked samples maintained in this tannin-containing tea matrix Green tea Differentiation between control and microplastic-spiked samples maintained in this tannin-containing tea matrix
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