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Chewing Gum as a Source of Oral Microplastic Intake: An Investigational Study
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Researchers tested five brands of chewing gum sold in Iran and found tiny plastic particles, mostly fibres and fragments made of polyethylene and polypropylene, in every sample. Levels ranged from 20 to 50 particles per gram, with the source of the plastic unclear. The authors noted these levels were higher than in many other foods and drinks.
Abstract Recent evidence suggests that chewing gum might be a source of microplastic (MP) exposure in humans. In this study, MPs are determined in five brands of chewing gum, sourced in Iran, following solvent-assisted digestion of the gum matrix. MPs were detected in all samples at concentrations ranging from 20 to 50 per g. MPs were dominated by fibres and fragments below 50 µm in size (with a detection limit of about 20 µm), with white the most common colour and polyethylene and polypropylene the main polymers. The origin of MPs in chewing gum is not clear but possible sources include the gum matrix, contaminated ingredients, manufacturing processes or plastic-based packaging. With concentrations of MPs greater than in many other foods and beverages, chewing gum could represent a significant means of exposure for individuals who regularly consume the product. As such, further research is warranted into a wider range of products and (smaller) particle sizes, and comparisons between new and chewed products and resulting saliva.
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