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Portable EcoExposure™ Optical Assay Maintains Microplastic Detection Across Tannin-Rich Environmental and Beverage Matrices
Original title: Portable EcoExposure™ Optical Assay Maintains Microplastic Detection Across Tannin-Rich Environmental and Beverage Matrices
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Scientists tested a portable smartphone-based tool for spotting microplastics in tricky liquids like coffee, tea, wine, and juice—drinks that are naturally colored and could make detection harder. The tool successfully told the difference between plain drinks and those spiked with microplastics across all the beverages tested, suggesting it could one day help people check their food and water for plastic contamination outside a lab. That said, this is early-stage proof-of-concept work—it shows the tool *can* detect microplastics, not yet how much is in your actual drinks or what that means for your health.
Tannins and other polyphenols are common matrix components in environmental waters and certain consumer products. This technical note evaluates whether the EcoExposure™ smartphone-based optical assay maintains qualitative microplastic and nanoplastic detection capability across tannin-rich liquid matrices. Proof-of-concept testing was conducted using a range of tannin-containing beverages as controlled surrogate matrices (black tea, green tea, coffee, grape juice, cranberry juice, red wine, beer, and cola), supplemented by prior observations in dissolved organic matter-rich environmental waters. Qualitative optical differentiation between control and microplastic/nanoplastic-spiked samples remained observable across all matrices despite substantial variation in color, dissolved organic matter, and tannin content. These findings support the continued development of rapid, field-deployable optical methods for microplastic detection in diverse real-world matrices. Table 1. Representative Tannin Matrices and Outcomes Between Control and Microplastic-Spiked Samples Representative Matrix Matrix Type Qualitative Optical Differentiation Between Control and Microplastic-Spiked Sample Maintained Filtered water Reference ✓ DOM-rich lake water Environmental ✓ DOM-rich pond water Environmental ✓ Medium-roast coffee High-tannin beverage ✓ Cabernet red wine High-tannin fermented beverage ✓ Grape juice Tannin-containing fruit juice ✓ Cranberry juice Tannin-containing fruit juice ✓ Black tea Tannin-containing tea ✓ Green tea Tannin-containing tea ✓ Beer Fermented beverage ✓ Cola Colored beverage ✓
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