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Identification and Evaluation of Microplastics from Tea Filter Bags Based on Raman Imaging

Foods 2022 55 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Tingna Mei, Tingna Mei, Xiaofeng Xiao, Jiahua Wang Xiaodan Liu, Xiaodan Liu, Xiaodan Liu, Tingna Mei, Tingna Mei, Tingna Mei, Tingna Mei, Tingna Mei, Tingna Mei, Xiaofeng Xiao, Huang Dai, Jingwen Lv, Xiaodan Liu, Jingwen Lv, Huang Dai, Qiaocong Li, Huang Dai, Xiaodan Liu, Fuwei Pi, Fuwei Pi, Qiaocong Li, Huang Dai, Fuwei Pi, Fuwei Pi, Huang Dai, Fuwei Pi, Huang Dai, Huang Dai, Huang Dai, Fuwei Pi, Huang Dai, Huang Dai, Huang Dai, Huang Dai, Xiaodan Liu, Fuwei Pi, Fuwei Pi, Fuwei Pi, Fuwei Pi, Jiahua Wang Fuwei Pi, Fuwei Pi, Jiahua Wang Jiahua Wang Jiahua Wang Jiahua Wang

Summary

Researchers identified and evaluated microplastic release from commercial tea filter bags using Raman imaging combined with chemometrics. The study found that up to 94% of tested filter bags released microplastics after soaking, with particles identified as matching the bag materials, highlighting a potential route of microplastic exposure through everyday beverage consumption.

Polymers

PE PET PP nylon

Microplastic (MP) contamination is a public issue for the environment and for human health. Plastic-based food filter bags, including polyethylene terephthalate, polypropylene, nylon 6 (NY6), and polyethylene, are widely used for soft drink sub-packaging, increasing the risk of MPs in foods and the environment. Three types of commercially available filter bags, including non-woven and woven bags, were collected, and MPs released after soaking were mapped using Raman imaging combined with chemometrics. Compared with peak area imaging at a single characteristic peak, Raman imaging combined with direct classical least squares calculation was more efficient and reliable for identifying MP features. Up to 94% of the bags released MPs after soaking, and there was no significant correlation with soaking conditions. Most MPs were tiny fragments and particles, and a few were fibrous MPs 620-840 μm in size. Woven NY6 filter bags had the lowest risk of releasing MPs. Source exploration revealed that most MPs originated from fragments and particles adsorbed on the surface of bags and strings. The results of this study are applicable to filter bag risk assessment and provide scientific guidance for regulating MPs in food.

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