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- W2050646918 abstract "The objective of this study was to simulate in vitro at least some of the conditions that prevail in man during ingestion of nitrate and nitrosable compounds. Human saliva has been chosen because most chemicals ingested through food will interact with saliva. The nitrosation of methylurea was used as a model because the nitrosation products can be readily detected by their mutagenic (his+ revertants of S. typhimurium) and clastogenic (chromosome aberrations in CHO cells) properties. The results show that human saliva inhibits the formation of mutagenic and clastogenic nitrosation products when present during nitrosation. A 50% inhibition of mutagenicity results from the addition of a saliva sample diluted at 5% of the original concentration. In the test system used a similar inhibitory effect was obtained by 2.5 mM ascorbic acid or 2.0 mM chlorogenic acid. The main inhibitory agents seem to reside in a deproteinized fraction which was filtered through an ultrafilter UM2 (greater than 1000 MW). At strong acid levels (below pH 2) the saliva loses its inhibitory effect on the nitrosation of methylurea. The contribution of saliva to the inhibition of endogenous nitrosation within the oral cavity or stomach is discussed." @default.
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- W2050646918 date "1982-08-01" @default.
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- W2050646918 title "The inhibitory effect of whole and deproteinized saliva on mutagenicity and clastogenicity resulting from a model nitrosation reaction" @default.
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- W2050646918 doi "https://doi.org/10.1016/0165-1161(82)90027-9" @default.
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