At Last A Machine With Good Taste -- For Espresso

For the food industry, "electronic tasters" like the new coffee-tasting machine could prove useful as quality control devices to monitor food production and processing. Christian Lindinger and colleagues at Nestlé Research pointed out that coffee scientists have long been searching for instrumental approaches to complement and eventually replace human sensory profiling.

However, the multisensory experience from drinking a cup of coffee makes it a particular challenge for flavor scientists trying to replicate these sensations on a machine. More than 1,000 substances may contribute to the complex aroma of coffee.

The new tasting machine assessed the taste and aromatic qualities of espresso coffee nearly as accurately as a panel of trained human espresso tasters, the study reported. It analyzed gases released by a heated espresso sample, then transformed the most pertinent chemical information into taste qualities like roasted, flowery, woody, toffee and acidity. "This work represents significant progress in terms of correlation of sensory with instrumental results exemplified on coffee," state the authors.

The article "When Machine Tastes Coffee: Instrumental Approach to Predict the Sensory Profile of Espresso Coffee" is scheduled for the March 1 issue of ACS' Analytical Chemistry.