Abstract
In the presence of iron(II) salts nitrite reacts with cysteine, and sources of cysteine including hydrolysed caseins, under a range of experimental conditions relevant to food processing, to yield the anti-microbial iron-sulphur nitrosyl salt Na[Fe 4S 3(NO) 7] in isolable quantities: under certain conditions, the conversion of nitrite to Na[Fe 4S 3(NO) 7] is quantitative. In similar reactions, methionine and some of its derivatives yield the neutral dinuclear complex [Fe 2(SCH 3) 2(NO) 4], a known tumour promoter, where the SCH 3 groups have been incorporated intact from methionine.
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