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Drinks from glass bottles may contain more microplastics than drinks from plastic bottles. This is the surprising result of a doctoral thesis presented by the French Food Safety Authority on Friday. According to the study, the particles in the glass bottles mostly come from the paint on the crown caps. “We expected the opposite result,” said doctoral student Iseline Chaïb.
She conducted the study, funded by the food authority and the Hauts-de-France region, in a laboratory in Boulogne-sur-Mer, northern France. According to the results, drinks sold in glass bottles contain an average of around 100 particles of microplastics. This is five to 50 times more than in drinks in plastic bottles or metal cans.
Better cleaning of crown caps
“The particles came from the same plastic as the paint on the metal caps,” explained Chaïb. These crown caps often had fine scratches, which were presumably caused by them rubbing against each other during storage. The study shows that improved cleaning of crown caps by manufacturers could reduce the number of microplastic particles by up to 60 percent. The food authority is now calling for the storage conditions of the caps or their coating to be changed.
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