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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.
Detection of microplastics (MPs) in food is critical for assessing human exposure and their potential health concerns. In this study, the Fenton reaction was optimised for isolating MPs from instant coffee and ground coffee with an overall recovery efficiency of 96.7 ± 2.27%. Analysis of 15 samples each revealed 1.433 ± 1.116 MPs/g in instant coffees and 0.343 ± 0.231 MPs/g in ground coffees. Twelve polymer types were identified using micro-Raman spectroscopy. Primarily, polypropylene (30.23%), polyisoprene (13.95%), and polyethylene terephthalate (9.30%) MPs were found in instant coffees, while ground coffee samples majorly contained polyurethane (32.35%), polyethylene terephthalate (11.76%), polyvinyl acetate (11.76%), and polyethylene (8.82%) MPs, indicating multiple points of entry. Estimated daily coffee intake corresponded to an ingestion of 421.57 ± 317.8 MPs/year. Findings of this study indicate a strong need for regulations and interventions along the food processing chain for reducing entry points of MP pollution.
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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.
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.
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.
Determination of the microplastic particle release by tea bags during brewing
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Researchers measured the release of microplastic particles from tea bags during brewing, finding that plastic particles leach into the hot beverage. This study highlights an often-overlooked source of microplastic ingestion through everyday food and drink preparation.
Drinking hot beverages from paper cups: Lifetime intake of microplastics
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Researchers quantified the lifetime intake of microplastics from drinking hot beverages in disposable paper cups lined with plastic. They estimated that a person drinking three hot beverages per day from paper cups could ingest tens of thousands of microplastic particles annually, along with associated contaminants like fluoride. The study provides one of the first lifetime exposure estimates for microplastics from this common everyday source.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.