Kimchi Probiotic Shows Promise in Removing Microplastics from Human Body, Study Finds

Breakthrough: Kimchi Bacteria Could Counter Nanoplastic Pollution

A probiotic strain found in the fermented Korean dish kimchi has been shown to bind tightly to nanoplastics under simulated human gut conditions, potentially offering a new way to prevent microplastic accumulation in organs.

Scientists at Seoul National University reported that the bacterium Lactobacillus plantarum isolated from commercial kimchi adhered to polystyrene nanoparticles with 89% efficiency—far surpassing other gut bacteria tested.

Urgent Health Implications

“Our findings suggest that certain dietary probiotics may act as a natural scavenger for microplastics before they enter the bloodstream,” said Dr. Kim Hyun-joo, lead author of the study. “This could be a simple, food-based strategy to reduce the growing toxic burden of nanoplastics.”

In lab experiments, the probiotic maintained its grip on particles even during harsh digestion—mimicking stomach acid, bile salts, and intestinal enzymes. Other bacterial strains lost over 50% of their binding capacity under the same conditions.

Background: The Microplastic Crisis

Microplastics and their smaller counterparts, nanoplastics, have been detected in human blood, lungs, and placentas. They originate from degraded plastic waste, synthetic textiles, and food packaging.

Once ingested, these particles can cross the intestinal barrier and accumulate in organs, potentially causing inflammation, oxidative stress, and cellular damage. Current removal strategies—such as filtration or drug-based chelation—remain experimental or impractical for daily use.

What the Study Found

Researchers created a dynamic gut simulation using the TIM-1 model, a sophisticated system that replicates peristalsis, pH changes, and enzyme secretion. They introduced nanoplastics (100 nm polystyrene beads) and tracked bacterial binding in real time.

Results showed that L. plantarum bound to nearly 90% of available nanoparticles within two hours. In contrast, common gut residents like E. coli and Bifidobacterium reached only 30–40% binding. The kimchi probiotic’s surface proteins appear to provide a “sticky” scaffold that traps plastics.

“This is the first demonstration of a food-grade bacterium targeting nanoplastics specifically in a gut-mimicking environment,” said co-author Dr. Park Min-ji, a food science researcher. “The stability of the binding is what makes it viable for real-world use.”

What This Means

If confirmed in human trials, regular consumption of kimchi or its isolated probiotic could become a daily nutritional intervention to reduce microplastic internalization. The bacteria would bind plastics in the intestine and be excreted with stool, preventing absorption.

However, experts caution that the study is limited to in vitro models. “We need to see if the same binding occurs in living humans and whether it alters the microbiome or has side effects,” noted Dr. Emily Zhang, a toxicologist at the University of California, Davis, who was not involved in the study.

Next Steps and Broader Impact

The research team is planning animal trials to evaluate efficacy and safety. They also aim to optimize the probiotic strain—perhaps engineering it to bind a wider range of plastic types, including PET and polyethylene.

Meanwhile, the study adds to a growing body of evidence that diet can modulate our exposure to environmental pollutants. “Fermented foods like kimchi are already rich in beneficial microbes. This discovery could give them a whole new role in public health,” said Dr. Kim.

Read more about the microplastic crisis and potential dietary solutions.