As any wine snob will tell you, it takes years to train a palate refined enough to fully appreciate the difference between a Chateau Mouton Rothschild and two-buck Chuck. But researchers in Spain and Germany may have found a way to automate the process. The researchers used an array of ion-sensitive field-effect transistors incorporated into a single silicon chip. The array was tuned so that it could detect relative levels of substances, such as sodium, potassium, calcium, copper, and silver. Based on the readings from the multisensor array, the researchers were readily able to distinguish among the varieties.
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