Parmesan test can detect cheesy imposters | Chemical & Engineering News
Volume 94 Issue 23 | p. 10 | Concentrates
Issue Date: June 6, 2016

Parmesan test can detect cheesy imposters

GC-MS method can determine the authenticity of Parmigiano-Reggiano cheese
Department: Science & Technology
News Channels: Analytical SCENE, Biological SCENE
Keywords: mass spectrometry, food, parmesan, cheese, GC-MS, counterfeit, Parmigiano-Reggiano, analytical chemistry
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Perfect with pasta, but is it real Parmesan?
Credit: Shutterstock
Photo of parmesan cheese and grater.
 
Perfect with pasta, but is it real Parmesan?
Credit: Shutterstock

A generous dusting of grated Parmesan perfects a plate of spaghetti. But how can a culinary connoisseur be sure that it really is the king of cheeses, Parmigiano-Reggiano? Augusta Caligiani of the University of Parma and colleagues have developed a method that can help determine whether Parmesan has been bulked out with less noble cheeses—or whether it is an outright imposter (J. Agric. Food Chem. 2016, DOI: 10.1021/acs.jafc.6b00913). The team had previously found that milk and cheese from cows fed a fermented fodder called silage contain traces of two unusual cyclopropane fatty acids (CPFAs), possibly made by lactic acid-producing bacteria in the silage. Now, the team has used gas chromatography-mass spectrometry to look for these molecules in 304 cheese samples. Cheeses with European Union regulations that forbid silage feeding—including Parmigiano-Reggiano, Fontina, and Gruyère—had no CPFAs, confirming their authenticity. But Grana Padano, which does use milk from silage-fed cows, contained 300–830 mg of telltale CPFAs per kg of fat. Grated Parmesan is particularly vulnerable to being adulterated with other cheeses, and this method could help detect counterfeits.

 
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