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More than just caffeine: Microplastics in commercial ground coffee as a source of human exposure
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Every single ground coffee sample tested from six countries, including popular brands you might have in your kitchen, contained tiny plastic particles, likely shed from packaging or processing equipment. While scientists don't yet know exactly how harmful swallowing these microplastics is, this study adds coffee to the growing list of everyday foods and drinks where plastic contamination is essentially unavoidable, highlighting the need for better food safety standards. If you're a heavy coffee drinker, this doesn't mean panic, it means one more reason to support research into microplastics and push for cleaner production practices.
Microplastics (MPs) are emerging contaminants widely detected in different environmental and food matrices, representing a potential route of human exposure through ingestion. Considering the high worldwide consumption of coffee, this study aimed to evaluate the occurrence of MPs in commercial ground coffee and discuss its relevance as an additional source of human exposure to these contaminants. Twenty brands of industrial ground coffee marketed in Brazil, Colombia, the Netherlands, Italy, Poland, and Belgium were analyzed, with three 5 g replicates per sample. After digestion with 10% KOH, filtration, and sorting under a stereomicroscope, the particles were counted and classified according to morphological type and color. For polymer identification by Raman spectroscopy, 28 particles were selected. MPs were detected in 100% of the samples, totaling 4,026 particles, with a predominance of filaments (94.237%), followed by fragments (4.397%) and tangles (1.366%). Blue particles were the most abundant among the color categories. MP abundance did not differ significantly among the analyzed countries but varied among individual samples. A theoretical worst-case estimate of the per capita/year exposure of MPs, calculated based on the mean number of particles detected in 5 g of coffee and the mean annual per capita coffee consumption in each country, was highest in Belgium and lowest in Colombia. Raman spectroscopy identified five types of polymers: PET, PU, nylon, PE, and white PVC, with a predominance of PET in most countries. The results demonstrate that commercial ground coffee constitutes a potential route of MP ingestion, reinforcing the need for monitoring throughout the production chain and for regulatory advances aimed at food safety.
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Microplastic exposure through coffee consumption: evidence from instant and ground brewed coffee
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Your morning coffee might come with a side of microplastics, researchers found tiny plastic particles in both instant and ground coffee, with instant coffee containing about four times more (roughly 1.4 particles per gram vs. 0.3). Based on typical coffee drinking habits, this adds up to over 400 microplastic particles ingested per year just from coffee, likely from plastic packaging, processing equipment, or filters. While we're still learning about the health effects of eating and drinking microplastics, this study highlights another everyday source worth watching as scientists push for better food safety regulations.
Hidden risk of microplastics in milk tea and coffee: A case study from China's freshly-made beverage market
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Researchers tested 105 freshly made milk tea and coffee drinks from seven popular brands in China and found microplastics in 93% of the samples. The average cup contained about 10 particles, primarily polyamide, polyurethane, and PET, which likely originated from the surrounding environment rather than the ingredients themselves. The study estimates that Chinese adults may consume around 25 microplastic particles per kilogram of body weight each year from these beverages alone.
Synthetic microplastics in hot and cold beverages from the UK market: Comprehensive assessment of human exposure via total beverage intake
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Researchers tested 155 common hot and cold beverages from UK stores and found microplastics in every single sample. Hot tea had the highest levels at about 60 particles per liter, and hot beverages consistently contained more microplastics than cold ones, suggesting that heat causes more plastic to leach from packaging. Based on typical UK drinking habits, the estimated daily microplastic intake from beverages alone was 3,432 to 6,864 particles per person.
Pouring hot water through drip bags releases thousands of microplastics into coffee
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Researchers found that pouring hot water through drip coffee bags releases thousands of microplastic particles into the beverage, with polyester and polypropylene bags releasing significantly more particles than other materials, raising concerns about daily microplastic ingestion from food packaging.
Human exposure to microplastics via the consumption of nonalcoholic beverages in various packaging materials: The case of Hong Kong
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Researchers tested 50 packaged nonalcoholic beverages in Hong Kong and found microplastics in every single one, with an estimated annual intake of about 6,200 microplastic particles per person from beverages alone. The contamination came from both the packaging materials and airborne particles during manufacturing, showing that everyday drinks are a meaningful source of human microplastic exposure.
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