Cleavage of the imidazole ring in histidyl residue analogues reacted with peroxidizing lipids
1979
Yong, Samuel H. | Karel, Marcus
Extract: Degradative reactions initiated by peroxidizing lipids on the histidyl imidazole side-chain were studied by reacting the histidyl residue analogues N-benzoylhistidine and hippurylhistidyl-leucine with methyl linoleate in a low-moisture model system resembling the structure of freeze-dried foods. After incubation at 51-57 degrees C and 75 percent relative humidity for 3 weeks, the imidazole sidechain was cleaved by peroxidizing methyl linoleate to yield asparagyl and aspartyl sidechains along with other compounds at lower concentrations. The free base form was the labile species.
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