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Evaluation of Representative Carbonated Beverage Matrices for Rapid Smartphone-Based Microplastic Detection Using a Plant-Derived Optical Assay
Summary
Researchers tested a smartphone-based tool that uses a plant-derived light-sensitive dye to detect tiny plastic particles in soda and other fizzy drinks, and found it worked even in tricky liquids like dark cola and diet soda that could normally interfere with such tests. This matters because it's an early step toward cheap, easy ways for consumers or manufacturers to check popular beverages for microplastics — though this study only shows the tool *can* detect plastics in these drinks, not how much microplastic is actually in the soda you drink or what that means for your health.
Carbonated soft drinks represent chemically complex beverage matrices containing dissolved carbon dioxide, high concentrations of carbohydrates, organic acids, colorants, and other dissolved constituents that can influence optical analytical methods. This technical note evaluates proof-of-concept compatibility of the EcoExposure™ rapid smartphone-based microplastic detection platform in a representative commercially available carbonated beverage matrices, including carbonated water, full-sugar cola, diet cola, and clear sugar-sweetened soda.. A carbonated water control was also evaluated to assess the influence of carbonation independent of other beverage components. Carbonated water demonstrated optical behavior comparable to filtered water controls, suggesting dissolved carbon dioxide is not a major contributor to assay performance under the evaluated conditions. Representative cola samples remained compatible with the assay following matrix preparation, with qualitative optical differences observable between control and microplastic-spiked samples. These findings support extension of the platform to complex carbonated beverage matrices. Liquid Representative Observation Filtered water Clear differentiation between control and microplastic-spiked samples Carbonated water Clear differentiation between control and microplastic-spiked samples Dark cola (full sugar) Differentiation between control and microplastic-spiked samples maintained in this high-sugar, caramel-colored carbonated matrix Clear soda (full sugar) Differentiation between control and microplastic-spiked samples maintained in this high-sugar clear carbonated matrix Diet cola Differentiation between control and microplastic-spiked samples maintained in this artificially sweetened carbonated matrix Diet citrus soda Differentiation between control and microplastic-spiked samples maintained in this artificially sweetened citrus carbonated matrix