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Journal of Dairy Science Vol. 50 No. 9 1495-1496
© 1967 by American Dairy Science Association ®
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Unusual Flavor Defect in Cheese Similar to the Odor of Feline Urine (Felis libyca domestica)1

W. A. McGugan and D. B. Emmons

Food Research Institute, Canada Department of Agriculture, Ottawa

ABSTRACT

A sporadically occurring flavor defect in Cheddar cheese is characterized by an odor of feline urine. Gas chromatography and mass spectrometry revealed a six-carbon monounsaturated ketone in vacuum distillates of fat from affected portions of cheese. This ketone was absent or present in much lower concentrations in unaffected portions of the same cheese. The odors and gas chromatograms of fractions of distillates obtained by vacuum sublimation indicate that the ketone did not have a feline odor, the unidentified feline substance subliming at a slightly higher temperature.

FOOTNOTES

1 Contribution no. 55 from the Food Research Institute.






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Copyright © 1967 by the American Dairy Science Association ®.