17] In October 2009, the US Environmental Protection Agency listed five nitrosamines as 'probably carcinogenic to humans': NDEA, NDMA, NDPA, NPYR and N-nitrosodiphenylamine (NDPhA).
Potentially carcinogenic nitrosamines identified in traditionally brewed beer samples Nitrosamines Samples * NDMA NDEA NDPA NPYR NDPhA Brewer A1 + + - + - Brewer A2 - - - + - Brewer A3 + - - - - Brewer B + - - - - Brewer C + + - - - Brewer D + - - + - NDPhA = N-nitrosodiphenylamine.
In this study, each of twenty chemicals (including Boric Acid, Sodium Carbonate, Potassium Fluoride, Sulfamic Acid, Hydroxyethyl Cellulose, Potassium Hydrogen Fluoride, Sodium Gluconate, Trisodium Phosphate Dodecahydrate, Ethanolamine, Sodium Nitrite, Chloroparaffin, Ferric Chloride, Neodecanoic Acid, Polyoxyethylene Nonylphenyl Ether, N-Nitrosodiphenylamine, Potassium Hexafluoroaluminate, Calcium Alkyl Aryl Sulfonate, Triethanolamine Dodecylbenzene Sulfonate, Sodium Palmitate, Triethanolamine Borate) was aged with metal coupons in sealed glassed tubes according to ASHRAE Standard 97-1999.
They were also seen with Chloroparaffin, Ferric Chloride, and N-Nitrosodiphenylamine at both initial concentrations and both aging temperatures.
For chemicals such as Potassium Fluoride at the high temperature and both initial concentrations, Sulfamic Acid and N-Nitrosodiphenylamine at the high concentration and both temperatures, and Sodium Palmitate at low concentration and low temperature, extraneous peaks (different from the peaks belonging to the chemicals) were detected after aging, indicative of the formation of reaction products.