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Journal of Dairy Science Vol. 64 No. 3 371-374
© 1981 by American Dairy Science Association ®
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Survey of Fluid and Nonfat Dry Milks for N-Nitrosamines1,2,

L. Lakritz and J. W. Pensabene

Eastern Regional Research Center3, Philadelphia, PA 19118

ABSTRACT

A limited survey of milk and dairy products was undertaken to determine the presence of volatile N-nitrosamines, a class of compounds carcinogenic to a broad range of animal species. Nitrosamines were detected and quantitated by a gas liquid chromatograph interfaced with a Thermal Energy Analyzer. Detectable N-nitrosodimethylamine, the only nitrosamine found, ranged from .05 ppb for whole milk to .30 ppb for nonfat dry milk. No N-nitrosodimethylamine was detected in raw milk, whereas 11 of 21 samples of pasteurized milk contained apparent N-nitrosodimethylamine at a mean .10 ppb. N-nitrosodimethylamine also was detected, but not confirmed by mass spectrometry, in evaporated and condensed milk with means .32 ppb and .58 ppb and in 9 of 10 nonfat dry milk samples with a mean of 1.69 ppb. Upon reconstitution condensed milk and nonfat dry milk contained N-nitrosodimethylamine comparable to that in pasteurized milk. No N-nitrosodimethylamine was detected in cultured milk products such as buttermilk and yogurt.

FOOTNOTES

1 NOTE: Precaution should be exercised in the handling of nitrosamines since they are potential carcinogens.

2 Reference to brand or firm name does not constitute endorsement by the US Department of Agriculture over others of a similar nature not mentioned.

3 Agricultural Research, Science and Education Administration, US Department of Agriculture.






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Copyright © 1981 by the American Dairy Science Association ®.