Water Reacts with Microplastics to Create Harmful Radicals, New Study Finds

Key points

• Researchers at Columbia University and UC Berkeley found that water causes microplastics to generate hydroxyl radicals, which damage red blood cells and proteins.
• The study challenges the long-held assumption that plastic is chemically inert, especially at the microscopic level.
• Polyethylene and polypropylene, common in food packaging, produced the most reactive radicals in laboratory tests.
• The findings suggest that the water-rich environment of the human body could amplify the toxic effects of microplastics.
• Industry representatives argue the study does not prove direct human health effects at actual exposure levels.

Background

Previous coverage in our archive highlighted the same Nature study, emphasizing that water activates plastic to create harmful radicals. Earlier reports noted that this mechanism may explain how microplastics cause cellular damage and inflammation, challenging the notion that plastic is inert.

How outlets are covering it

The Chicago Tribune and WIRED both emphasize the significance of the finding that water makes microplastics chemically active, linking it to potential health risks. Harvard Health provides a broader context on microplastics found in various tissues and their association with diseases, but does not focus on the chemical reaction with water. AZoCleantech discusses a different study on biodegradable plastics affecting fish blood, highlighting that aging in the environment changes their impact. The American Chemistry Council, cited by the Chicago Tribune, argues that the study does not establish effects within the body or at human exposure levels.

Why it matters

This study provides a potential mechanism for how microplastics cause health issues, such as inflammation and disease, by interacting with water in the body. It challenges the assumption that plastic is inert and suggests that certain plastics may need to be reformulated or phased out to reduce health risks.

What to watch

Further research is needed to determine the extent to which this phenomenon contributes to health effects in humans. The findings may guide future studies on the safety of different plastics and the development of biodegradable alternatives that are less harmful.