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The principal reaction between 14 C‐labelled methyl bromide and the nitrogen‐containing groups of wheat protein has been shown, by combined radioactive tracer‐chromatographic techniques, to be with the histidine residue. Three methylated histidines are present in the hydriodic acid hydrolysate of the protein that has been exposed to methyl bromide, and these have been identified as I‐ N ‐methylhistidine, 3‐ N ‐methylhistidine and I:3‐ N ‐dimethylhistidine. The amount of reaction occurring under typical fumigation conditions is so small that the loss of the semi‐essential amino‐acid, histidine, is negligible.
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R.G. Bridges (1955) studied this question.
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