milk products were found to contain less than 0.1-3.6 ppb npyr , less than 0.1-5.7 ppb ndma and less than 0.1-0.7 ppb npip , while in flavourings the nitrosamine concentrations were less than 0.1-10.3 ppb npyr , less than 0.1-3.6 ppb ndma and less than 0.1-0.9 ppb npip .
C0028197
nitrosamine
C0027253
npyr