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N-(nitrosomethyl ) urea (NMU ) was characterized in the carcinogenic nitrosated fish sauce (NFS) with high performance liquid chromatography (HPLC )- pholohydrolysis-pyrolysis-thermal en -ergy analysis recently. We used HPLC-electronic spray ionization-mass spectrometry and HPLC-diode array detection to confirm NMU in NFS furiher. It was observed that the corresponding chro-matographic fraction of NMU of NFS showed the same mass spectrum (m/z 64, 102, and 145) andultraviolet-absorbance (λ max = 230 nm) as those of authentic NMU. These results confirmed that thecomponent of NFS was NMU
N- (nitrosomethyl) urea (NMU) was characterized in the carcinogenic nitrosated fish sauce (NFS) with high performance liquid chromatography (HPLC) - pholohydrolysis-pyrolysis- thermal en-ergy analysis recently. We used HPLC-electronic spray ionization-mass spectrometry It was observed that the corresponding chro-matographic fraction of NMU of NFS showed the same mass spectrum (m / z 64, 102, and 145) and ultraviolet-absorbance (λ max = 230 nm) as those of authentic NMU. These results confirmed that thecomponentof NFSwas NMU