Results 171 to 180 of about 12,056 (230)
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N-nitrosamines in Chinese foods
Food and Chemical Toxicology, 1988A total of 695 different Chinese foods and ten malt samples were analysed, using gas chromatography-thermal energy analysis, for the possible presence of volatile N-nitrosamines. N-Nitrosodimethylamine (NDMA) was found in 146 of 176 beers tested at concentrations ranging from 0.1 to 6 ppb.
P J, Song, J F, Hu
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Mutagenicities of N-nitrosamines on salmonella
Mutation Research, 1977The mutagenic activities of 11 N-nitrosamines were tested using Salmonella typhimurium TA100 and TA98. All the carcinogenic N-nitrosamines were mutagenic on TA100 with a drug-activating system from the rat liver, whereas N,N-diphenylnitrosamine, a non-carcinogen, was not mutagenic.
Takie Yahagi +5 more
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New derivatives of N-nitrosamines
Talanta, 1987Two new derivatives are proposed for determination of nitrosamines by GLC. One is formed by reaction with di(2-chloroethyl) phosphochloridate and the other by reaction with m-trifluorotoluene sulphonyl chloride.
O R, Idowu, O O, Faboya
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Formation of an N-nitrosamine by oxidation
Cancer Letters, 1986Tolazamide, an antidiabetic drug, was found to produce N-nitrosohexamethyleneimine (NHM) upon exposure to an oxidizing agent and in the absence of a nitrosating agent. The oxidizing agents were either hydrogen peroxide or oxygen.
G W, Harrington +4 more
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C R C Critical Reviews in Food Technology, 1975
N‐nitrosamines are an extremely hazardous class of compounds. The possibility of the occurrence of these compounds in our food and in other environmental situations has caused concern over the past decade. This review examines the literature which provides an understanding of the chemistry of N‐nitrosamine formation. Particular attention is paid to the
Richard A. Scanlan, Phillip Issenberg
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N‐nitrosamines are an extremely hazardous class of compounds. The possibility of the occurrence of these compounds in our food and in other environmental situations has caused concern over the past decade. This review examines the literature which provides an understanding of the chemistry of N‐nitrosamine formation. Particular attention is paid to the
Richard A. Scanlan, Phillip Issenberg
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N-nitrosamines in the diet of experimental animals
Cancer Letters, 1979Summary The diets of experimental animals were analyzed for the presence of chemical carcinogens. Volatile N-nitrosamines were regularly found, the most persistent being N-nitrosodimethylamine with typical levels of 1–10 μg/kg. Other N-nitrosamines found included N-nitrosodiethylamine, N-nitrosodipropylamine, N-nitrosodibutylamine, N ...
E A, Walker, M, Castegnaro, L, Griciute
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Solid-phase microextraction of N-nitrosamines
Journal of Chromatography A, 2006A method was developed for the extraction of seven N-nitrosamine compounds from water by solid-phase microextraction (SPME). The method developed requires a total analysis time of only 1.25 h for both extraction and detection (versus 3-20 h for other isolation techniques). Three gas chromatography (GC) detection systems were tested with the SPME method,
Janel E, Grebel +2 more
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N-Nitrosamine formation from atrazine
Bulletin of Environmental Contamination and Toxicology, 1976Previous studies have focused on N-nitroso derivatives of relatively non-persistent pesticides or pesticides that form unstable N-nitroso derivatives. We feel that more persistent pesticides or their degradative products capable of forming N-nitroso derivatives should be investigated.
N L, Wolfe +3 more
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Reactive Metabolites from N-Nitrosamines
1991N-Nitrosodialkylamines are metabolically activated by hydroxylation at the carbon atom alpha to the N-nitroso group. Spontaneous cleavage of the C-N bond in the α-hydroxynitrosamine leads to production of an alkydiazohydroxide that decomposes to an alkydiazonium ion. In principle, the diazonium ion can lose nitrogen to form a carbonium ion, although we
M C, Archer +3 more
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Volatile N‐nitrosamines in Urinary Catheters
British Journal of Urology, 1989Summary— Levels of volatile N‐nitrosamines were measured in 10 brands of latex and 2 brands of silicone catheters using high performance liquid chromatography. The cytotoxicity of catheters from identical batches was determined by measuring the inhibitory effect of catheter extracts on the uptake of
M P, Heenan +4 more
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