Electronic Nose Inspects Cheese, Hints At Human Sens...( up what they call top ...),Health

up what they call top notes, middle notes, and bottom notes. When people smell an aroma, they experience one sensation immediately, then another sensation later, and then another at the end," explained Harper. "We suspect that compounds that are present in a sample in very low quantities but possess a very strong affinity bind to the sensors first. Those are the top notes. Then, compounds with lower affinity but much higher concentration -- the middle notes -- reach the sensors and replace the top notes. We don't know exactly what's happening with the bottom notes yet."

That explains why some scents scramble the machine's sensors. "Electronic noses have been used to pick up off-odors in beer, but they don't work on whiskey. When a sample contains one compound such as alcohol in high concentrations, then the machine's sensitivity for other compounds goes down," said Harper.

An endowment from the dairy industry of Ohio funded this research, and Brewster Cheese Inc. of Brewster, Ohio, provided the cheeses. The commercially-available electronic nose Harper and Jou used was the Fox 2000 from Alpha M.O.S., a French instruments company.

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Contact: W. James Harper
Harper.9@osu.edu
(614) 292-6281
Ohio State University
30-Sep-1998

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