Leuconostoc mesenteroides is one of the organisms that drives the early stage of vegetable fermentation, and it is a normal resident of kimchi and sauerkraut rather than a laboratory construction. That matters here for a practical reason: an organism already eaten in quantity clears a regulatory and safety bar that a novel one would have to earn.
Drawn from background microbiology, not from this paper.
The authors frame the problem as needing a removal strategy that works in two very different places at once, in the environment and inside an intestine, and note that bacteria able to function in both contexts have barely been looked for. Their aim was to find a food derived organism that keeps working when conditions change rather than one that performs in a single narrow setup.
Drawn from the paper's abstract and stated aims.
Leuconostoc mesenteroides CBA3656, derived from food, showed high nanoplastic biosorption efficiency across concentrations from 10 to 200 parts per million, across acidity from pH 3 to pH 9, and across temperatures from 4 to 55 degrees Celsius.
Adsorption was rapid, reaching its effect at short contact times.
The binding followed pseudo first order kinetics and the Langmuir isotherm model, which the authors read as predominantly physical adsorption onto a surface.
Infrared spectroscopy pointed at phosphate, carbonyl and ether groups in the cell wall and membrane as the parts of the surface interacting with the particles.
In fluid formulated to simulate intestinal conditions, CBA3656 outperformed other strains of the same species.
Mice given the strain showed significantly enhanced faecal excretion of nanoplastics.
| Concentration range | 10 to 200 parts per million |
| Acidity range | pH 3 to pH 9 |
| Temperature range | 4 to 55 degrees Celsius |
| Kinetics and isotherm | pseudo first order, Langmuir, read as physical adsorption |
| Surface groups implicated | phosphate, carbonyl and ether groups in cell wall and membrane |
| In vivo result | significantly enhanced faecal excretion of nanoplastics in mice, magnitude not stated in the abstract |
Shown in this study The study measured this step directly.
Phosphate, carbonyl and ether groups sitting in the cell wall and membrane are the parts of the surface that interact with the particles, which is a chemistry that does not depend on the organism doing anything active.
The modelling supports the same reading. A Langmuir fit describes particles settling into a finite set of surface sites, and pseudo first order kinetics describe a process limited by how fast material reaches those sites rather than by any reaction.
That is also the best explanation for the indifference to conditions. A process this physical has little to be disrupted by acid or by cold, which is why it survived the range from stomach acidity upward.
Drawn from the paper's infrared spectroscopy and adsorption modelling.
Robustness is now the property on the table rather than raw capacity. A candidate organism has been shown to keep working across the range of acidity and temperature that anything swallowed will actually meet, which is a harder test than a single tube at body temperature.
One kimchi derived strain against nanoplastics, in vitro and in mice.
A head to head against the strains other groups have nominated, run in the same conditions, and an animal result reported as an amount rather than a direction.
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