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3 protocols using n nitrosomorpholine

1

Hepatocellular Carcinoma Cell Culture

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Medium DMEM was purchased from Corning. Fetal bovine serum (FBS) and pancreatin were purchased from GiBico. N-nitrosodiethylamine12 (link) and N-nitrosomorpholine (NMOR) were purchased from Sigma (St, Louis, MO, USA). Matrigel was purchased from BD. Rabbit polyclonal antibody to AFP (14550-1-AP), Rabbit polyclonal antibody to CK7 (15539-1-AP), Rabbit polyclonal antibody to CK8 (10384-1-AP), Mouse monoclonal to beta actin (60008-1-lg) and all secondary antibodies were procured from proteinteck (Proteinteck, CHINA).
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2

Analysis of N-Nitrosamines in Chemicals

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Dimethylamine (DMA), diethylamine
(DEA), sulfamic acid, formaldehyde (HCHO, 37 wt % in H2O containing 10–15% methanol as a stabilizer), acetone, and
benzaldehyde were obtained from Sigma-Aldrich, pyrrolidine (PYR),
morpholine (MOR), sodium nitrite, and acetaldehyde from Merck, and N-methylethylamine (MEA) from Tokyo Chemical Industry (TCI)
Co., Ltd. The US-EPA 8270 N-nitrosamines mix (2000
μg/mL each component in methanol), containing N-nitrosodibutylamine (NDBA), N-nitrosodiethylamine
(NDEA), N-nitrosoDimethylamine (NDMA), N-nitrosodiphenylamine (NDPhA), N-nitrosodi-n-propylamine
(NDPA), N-nitrosomethylethylamine (NMEA), N-nitrosomorpholine (NMOR), N-nitrosopiperidine
(NPIP), and N-nitrosopyrrolidine (NPYR), was obtained
from Sigma-Aldrich. All chemicals were of analytical grade and used
as received without further purification.
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3

Quantification of Nitrosamines in Chemical Samples

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N-nitrosodimethylamine (NDMA), n-nitrosodiethylamine (NDEA), n-nitrosodi-n-propylamine (NDPA), n-nitrosodi-n-buthylamine (NDBA), n-nitrosopiperidine (NPIP), n-nitrosopyrrolidine (NPYR), n-nitrosomorpholine (NMOR), n-nitrosodiphenylamine (NDPhA), n-nitroso-n-methylethylamine (NMEA), and n-nitrodi-n-propylamine-d14 (internal standard) were purchased from Sigma-Aldrich Korea (Cheoin-gu, Yongin, Korea). Methanol (HPLC grade), ethanol (HPLC grade), acetonitrile (HPLC grade), acetic acid, and n-heptane were purchased from Duksan Pure Chemicals Co. (Danwon-gu, Ansan, Korea). Ultra-pure water was prepared using an aquaMAXTM Ultra 370 series (YL Instruments, Anyang, Korea) water purification system (18.2 MΩ cm).
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