A simple computing device uses DNA to measure the level of contaminants such as lead in a sample, which could offer a cheap and easy way for people to judge the quality of their drinking water
in 2020 that can detect contaminants in a single drop of water. It contains proteins that react to the presence of certain chemicals by producing fluorescent molecules. This easily spotted reaction acts as a warning that a water sample is polluted with these chemicals.
Now, the team has created a more advanced version of the system that can not only warn of the presence of dangerous chemicals, but also report on the amounts present so that proportionate steps can be taken. Each tube has progressively larger quantities of this DNA. Because the final fluorescent step of the reaction only occurs after the decoy DNA is used up, this means a tube with a low amount of decoy DNA may fluoresce in the presence of the contaminant, but a tube with a high amount of this DNA may not. It is possible to measure the contaminant level simply by looking to see where along the row of eight tubes the fluorescent reaction stops.Lucks and his team demonstrated that ROSALIND 2.
Establishing the concentration of a contaminant helps to decide on the necessary remedial action. If you have tiny amounts of lead in your drinking water supply, for example, then you might only need to flush water pipes before use. But“Everybody should have these things,” says Lucks. “You should know your water is safe to drink.”
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