Plastic pollution is a pressing environmental issue that poses serious risks to human health. One major source of micro and nanoplastic (MNPL) contamination is food packaging, with ingestion being the primary route of exposure for humans. A recent study conducted by the Mutagenesis Group at the University Autonomous of Barcelona (UAB) has shed light on the release of MNPLs from polymer-based commercial tea bags.
The researchers found that when these tea bags are used to make tea, they release millions of nano-sized particles and nanofilamentous structures. This release represents a significant source of exposure to MNPLs. The study focused on tea bags made from nylon-6, polypropylene, and cellulose. Results showed that polypropylene released approximately 1.2 billion particles per milliliter, cellulose released about 135 million particles per milliliter, and nylon-6 released 8.18 million particles per milliliter.
Advanced analytical techniques such as scanning electron microscopy, transmission electron microscopy, and nanoparticle tracking analysis were used to characterize the particles present in the tea infusion. The researchers emphasized the importance of using cutting-edge techniques to advance understanding of the potential impacts of MNPLs on human health.
In a groundbreaking development, the researchers exposed the particles to human intestinal cells to observe their interactions and potential cellular internalization. The experiments revealed that mucus-producing intestinal cells exhibited the highest uptake of micro and nanoplastics, with some particles even entering the cell nucleus. This finding highlights the role of intestinal mucus in the absorption of pollutant particles and underscores the need for further research on the health effects of chronic exposure.
The researchers stress the importance of developing standardized test methods to assess MNPL contamination from plastic food packaging and implementing regulatory policies to mitigate this contamination. As plastic use in food packaging continues to rise, addressing MNPL contamination is crucial for ensuring food safety and protecting public health.
The study, published in the journal Chemosphere, provides valuable insights into the release of MNPLs from commercial tea bags and their potential impact on human health. Further research is needed to fully understand the risks associated with MNPL exposure and to inform regulatory measures that safeguard public health.
This article was originally published on the UAB website and is subject to copyright. For more information, you can access the full study in the journal Chemosphere.
