Gel-trapped bacteria break down two common crop insecticides
Jiang H, He Z, Zhang M, Pei R, An X
Phytoremediation
Runoff from treated fields and greenhouses often carries these insecticides into ditches and streams near gardens and parks, and this bacterial cleanup method could someday help filter that water before it spreads further.
Researchers took a bacterium and gave it a special enzyme, called nitrilase, that can chew apart the chemical structure of two widely used insecticides. They then locked the bacteria inside tiny gel beads, kind of like Jell-O capsules, which made them sturdier and better at surviving heat, harsh pH, and long storage than bacteria left loose in a dish. The gel-bound bacteria broke down the insecticides into new byproducts, including one path never seen before, showing a promising way to treat pesticide-polluted water.
Key Findings
Immobilized E. coli expressing the VbNitA nitrilase degraded flonicamid into two byproducts and thiacloprid into thiacloprid-amide and thiacloprid-imine, the latter a newly discovered degradation intermediate.
Gel-encapsulated bacteria withstood high temperatures, acidic and alkaline conditions, and long-term storage better than free-floating cells.
Optimal starting concentrations for degradation were 45.13 μmol/L for flonicamid and 127.50 μmol/L for thiacloprid, with flonicamid breaking down faster than thiacloprid.
chevron_right Technical Summary
Scientists engineered bacteria trapped in gel beads that can break down two common crop insecticides, flonicamid and thiacloprid, offering a tougher and more durable way to clean up pesticide-contaminated wastewater than using free-floating bacteria.
Abstract Preview
Original paper
Nitrilase-mediated degradation of insecticides flonicamid and thiacloprid by immobilized engineered Escherichia coli with a novel pathway.
The nitrile‑containing insecticides flonicamid (FLO) and thiacloprid (THI) are widely used in agriculture, posing risks to the environment and animal health. Nitrilase is a key catalyst for the deg...
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