Presence of volatile N-nitrosamines in beer and other alcoholic drinks
are well documented in developed countries. Analysis of 120 beer samp
les of various brands/batches showed positivity for N-nitrosodimethyla
mine (NDMA) in more than 100 samples. The overall mean of 3.6 ppb of N
DMA is higher than those currently found in Western countries. Since N
-nitrosamines are proven carcinogens in animals at several sites it is
necessary to keep their levels of exposure to as low as possible.