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A new generation of e-nose uses a DNA scaffolding and molecular fluorescence to distinguish among various vapors, in a breakthrough that could make electronic sniffers more powerful and simpler to produce, according to researchers at Stanford University.

The method could conceivably detect anything from spoiled milk to explosives, the researchers say -- a major advancement over existing e-noses, which search for only a couple of specific molecules.

The e-nose involves attaching fluorescent compounds onto strands of DNA molecules, which then change color in the presence of certain substances. Stanford chemistry professor Eric Kool says one sensor could tell the difference between four organic vapors, because it would change colors with each one.

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