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Efficient biosorption of nanoplastics by food-derived lactic acid bacterium
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Leuconostoc mesenteroides CBA3656, a bacterium isolated from food, bound nanoplastics in lab tests across a wide range of concentrations, pH values and temperatures. The binding looked mainly physical. In animal experiments, more nanoplastics were recovered in the feces of animals given the strain.
Nanoplastics (NPs) are increasingly prevalent in ecosystems and human food chains and pose potential health risks, necessitating effective removal strategies applicable to both environmental and intestinal conditions. However, bacteria capable of functioning in both contexts remain poorly explored. Here, the food-derived bacterium Leuconostoc mesenteroides CBA3656 exhibited high NP biosorption efficiency across a wide range of NP concentrations (10-200 ppm), pH values (3-9), and temperatures (4-55°C), along with rapid adsorption at short contact times. Biosorption behavior followed pseudo-first-order kinetics and the Langmuir isotherm model, indicating predominantly physical adsorption. Fourier-transform infrared spectroscopy revealed that functional groups such as PO, CO, and COC in cell wall and membrane components contribute to NP interactions. Under simulated intestinal fluid, strain CBA3656 outperformed other Leuconostoc mesenteroides strains, and in vivo experiments demonstrated significantly enhanced fecal excretion of NPs. These results identify strain CBA3656 as a promising microbial biosorbent for NP mitigation.
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Mice exposed to polystyrene microplastics were given Lactobacillus plantarum strains that differed in antioxidant activity and in how well they bind the particles. Mice given strong binders had less polystyrene in the body and more in feces. A weakly binding strain also lowered toxicity, apparently through the intestinal barrier and bile acid metabolism.
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Researchers screened bacteria from Korean traditional soy sauce for binding to polystyrene and PET micro- and nanoplastics. Lactiplantibacillus pentosus GH14 bound the most, aided by a water-repelling cell surface, biofilm formation and a tendency to aggregate. All tests were done in the lab, and binding depended mainly on contact time and particle concentration.
Lactic acid bacteria reduce polystyrene micro- and nanoplastics-induced toxicity through their bio-binding capacity and gut environment repair ability
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Mice exposed to micro- and nanoplastics were given lactic acid bacteria that differed in how strongly they bind the particles in lab tests. Stronger binders reduced toxicity more. One weak binder, Lactobacillus plantarum DT22, still lowered toxicity, by raising tight junction proteins and shifting the gut microbiota.
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