Scientists Create Human-like 'E-tongue'

An "electronic tongue" that can digitally measure the taste of sweetness has been created by scientists.

Under the leadership of Kenneth Suslick, a chemistry professor at the University of Illinois at Urbana-Champaign, the revolutionary device, which makes use of a postage stamp-size piece of paper dotted with colored pigments, has been developed.

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The study has appeared August 1 in the journal Analytical Chemistry.

"E-tongue" can identify with 100 percent accuracy the full sweep of natural and artificial sweet substances, including 14 common sweeteners, using easy-to-read color markers, reports National Geographic News.

Suslick's team spent a decade developing colorimetric sensor arrays (PDF), where chemicals in each of the 16 to 36 micro dye spots reacted with sweet substances to produce color changes.

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The colors tell not just which types of sweeteners are present, but also how much there is.

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