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N-nitrosamines in grass silages

L W Van Broekhoven, J A Davies

IARC Scientific Publications

|January 1, 1982

Summary

This summary is machine-generated.

N-nitrosamine formation in silage from nitrate-rich grass was studied. Volatile N-nitrosamines like NDMA and NDEA were detected, decreasing after silage stabilization.

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Area of Science:

Agricultural Science
Food Chemistry
Environmental Health

Background:

Silage fermentation, especially from nitrate-rich grass, can create conditions favorable for N-nitrosamine formation.
Previous studies indicated low levels of volatile N-nitrosamines in such silages.

Purpose of the Study:

To investigate the formation of N-nitrosamines during the initial ten days of silage fermentation.
To quantify volatile and non-volatile N-nitroso compounds in silage.

Main Methods:

Analysis of volatile N-nitrosamines (NDMA, NDEA) during the first ten days of ensilage.
Monitoring nitrite formation alongside N-nitrosamine development.
Preliminary assessment of non-volatile N-nitroso compounds using the Walters et al. (1980) method.

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Main Results:

Volatile N-nitrosamines, specifically N-nitrosodimethylamine (NDMA) and N-nitrosodiethylamine (NDEA), were detected at concentrations up to approximately 2 µg/kg.
These concentrations decreased to about 0.6 µg/kg after silage stabilization.
Preliminary findings suggest the presence of non-volatile N-nitroso compounds at levels equivalent to 85 mg NPIP/kg.

Conclusions:

Nitrite formation during silage fermentation is linked to volatile N-nitrosamine production.
N-nitrosamine levels in silage decrease as fermentation stabilizes.
Further investigation into non-volatile N-nitroso compounds in silage is warranted.