Tiny Plastics Generate Harmful Free Radicals in Water

Scientists have long assumed that plastics are chemically inert. A new study from Columbia University shows that when plastic is broken into micro‑sized fragments and mixed with water, it can generate highly reactive molecules known as free radicals. The finding, published in the journal Nature, challenges the prevailing view that plastics pose only passive chemical risks.

How Tiny Pieces Produce Radicals

According to senior study author Wei Min, the tiny pieces have a huge surface area, causing the surrounding water to change and produce free radicals. These unstable molecules could damage cells, leading to inflammation, immune dysfunction and metabolic changes. Since the body is mostly water, the radicals could form inside humans or even in bottled water.

While more research is needed to quantify health risks, the work suggests that microplastics might be more hazardous than previously thought. It could guide future plastic design to reduce radical formation and inform regulatory assessments of plastic exposure.