Do you often check your water for heavy metal contamination? According to the U.S. Environmental Protection Agency, it is recommended to test your drinking water for hardness and corrosion, potentially caused by heavy metals, at least every three years.
Heavy metals are elements found in nature that are very dense and have a high atomic weight. The widespread use of heavy metals across numerous industries and applications has resulted in their environmental waste, posing a serious threat to human and ecological well-being, especially in developing countries. While some heavy metals are essential for human health in small amounts (like iron and zinc), many others may negatively impact human health and metabolism (like arsenic and chromium). Heavy metals can accumulate in the body over time, leading to chronic toxicity and damage to the organs. Recent research has shown that there are ways to use the bacteria Escherichia coli, or E. coli, to sense traces of heavy metals in water.
Researchers at the University of California, Irvine, developed a machine learning prediction analysis on the stress response of E. Coli when exposed to chromium and arsenic. E. coli cultures were exposed to chromium or arsenic salts for two hours, where E. coli cells responded metabolically to those ions. The bacterial cells are then broken down, and their metabolic compounds are collected. The researchers used a technique called surface-enhanced Raman scattering, or SERS, surfaces in order to amplify the chemical signals from the metabolic compounds. The experiments were then repeated with varying concentrations of chromium and arsenic to gather data for the machine learning algorithms.
The metabolic response of E. coli can be used to detect hard metals.
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The researchers performed statistical analyses and found that E. coli could detect low amounts of chromium and arsenic at 100,000 times lower than the World Health Organization recommended limits. This inferred that E. coli may detect contaminant levels early. They also used their algorithm on water samples with varying contaminants and found that it was generalizable with a 92% accuracy.
While further research and development are necessary to translate this promising technology into practical applications, the potential impact of this E. coli-based biosensor for heavy metal detection is present. This innovative approach of utilizing E. coli as a biosensor could pave the way for the development of accurate platforms for detecting heavy metal contamination in water sources with other toxins. It also represents a significant advancement in environmental monitoring and public health protection, offering a powerful tool to combat the threat of heavy metal contamination in our water resources around the world. Until then, keep checking your drinking water sources!
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