AUTOXIDATION OF METHYL LINOLEATE IN FREEZE-DRIED MODEL SYSTEMS .4. EFFECTS OF METALS AND OF HISTIDINE IN ABSENCE OF WATER

被引:15
作者
TJHIO, KH
KAREL, M
机构
[1] Department of Nutrition and Food Science, Massachusetts Institute of Technology, Cambridge, Massachusetts
关键词
D O I
10.1111/j.1365-2621.1969.tb12083.x
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
SUMMARY: Autoxidation of methyl linoleate dispersed on filter paper was studied in the dry state in the presence and absence of additives. Oxidation was followed volumetrically and by measuring the increase in conjugated dienes. Evaluation of the rate data indicates that added histidine is antioxidant in the very early stages of the oxidation and becomes prooxidant in the later stages. Increasing the concentration of histidine promoted an earlier appearance of its prooxidant effect. Cobalt chloride and manganese sulfate had a pronounced catalytic effect on the oxidation reaction in the model systems buffered to a high (8.0 and 9.0) but not to a low (4.0) pH. Histidine increased the catalytic activity of manganese but eliminated that of cobalt. Thin‐layer chromatography showed that conditions under which histidine increased the prooxidant effect of manganese also resulted in the appearance of some decomposition products of histidine. These decomposition products may have catalytic activity. Copyright © 1969, Wiley Blackwell. All rights reserved
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页码:540 / &
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