Oil spill cleanup chemicals may block microbes from eating oil
Zhu S, Pan K, Lei S, Li M, Pan T
Phytoremediation
If you've ever wondered why oil spill cleanups drag on for years, this shows the very chemicals meant to help can shut down the natural microbes doing the real work of breaking down the oil.
When oil spills happen in the ocean, cleanup crews often spray soap-like chemicals called dispersants to break up the oil. This study found that at high doses, those same chemicals coat tiny oil-eating yeast cells and physically push them away from the oil droplets, so the yeast can't do its job of digesting the pollution. The effect got worse depending on which dispersant was used, with oil-loving versions causing the most dramatic disruption.
Key Findings
High concentrations of four tested surfactants (Tween 80, Span 80, commercial dispersant GH-2, and rhamnolipid) severely suppressed n-tetradecane biodegradation by marine yeast Yarrowia lipolytica, while low concentrations had negligible effect.
Surfactants bind to yeast cell surfaces first, altering surface chemistry and increasing electrostatic repulsion, then outcompete the cells for space at the oil-water interface.
Hydrophilic surfactants caused simple detachment of cells from oil droplets, whereas highly lipophilic surfactants triggered catastrophic phase inversion, both isolating cells from the oil they need to consume.
chevron_right Technical Summary
Scientists found that chemical dispersants used to clean up ocean oil spills can backfire by coating oil-eating yeast cells and blocking them from reaching the oil they're supposed to break down.
Abstract Preview
Original paper
Competitive interfacial adsorption of surfactants suppresses alkane biodegradation in yeast-stabilized Pickering emulsions.
The application of chemical dispersants in marine oil spill bioremediation remains controversial due to uncertain effects on microbial activity. This study investigated how four diverse surfactants...
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