Soil bacteria strip toxic chromium from contaminated vegetable crops
Udhayakumar M, Chinnaiya V, Veerasamy V, Ajeesh Krishna TP, Madhubala Parameswaran AD
Phytoremediation
If you grow root vegetables in soil near old industrial runoff or a river with a manufacturing history, the heavy metals your carrots and beets soak up from the ground could soon be treatable with a bacterial cleanup crew instead of abandoning the plot.
Researchers pulled two types of bacteria out of river-basin soil contaminated by industry and found they naturally make grease-fighting compounds, similar to tiny soap molecules. When tested on sweet potatoes, yams, carrots, and beetroots grown in chromium-tainted soil, these bacterial compounds pulled the toxic metal out of the vegetables. The same compounds also stopped disease-causing bacteria from sticking together and forming protective slime layers on surfaces.
Key Findings
Rosellomorea sp. produced stronger biosurfactant activity than Bacillus sp. (56.25% vs 42.5% emulsification index) when grown with sodium citrate as the carbon source
GC-MS analysis identified n-hexadecanoic acid and 9-octadecenoic acid as major biosurfactant components, with FTIR confirming lipid- and glycoprotein-based structures
The biosurfactants removed chromium (VI) from sweet potatoes, elephant yams, carrots, and beetroots while also inhibiting biofilm formation by foodborne pathogens
chevron_right Technical Summary
Scientists found two soil bacteria that produce natural soap-like compounds capable of pulling toxic chromium out of contaminated vegetables like sweet potatoes and carrots, while also fighting the bacterial slime (biofilm) that harbors foodborne pathogens.
Abstract Preview
Original paper
Isolation and Characterization of Biosurfactants from Bacillus sp. and Rosellomorea sp. and their Application for Removal of Chromium Level in Vegetable Crops.
There is a high chance of accumulating the heavy metals in the edible parts of crops cultivated in contaminated soil. Therefore, heavy metal contamination in arable soils threatens world food secur...
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