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Journal of Dairy Science Vol. 34 No. 3 187-194
© 1951 by American Dairy Science Association ®
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A Study of the Effect of Nordihydroguaiaretic Acid on the Oxygen Absorption of the Phospholipid Fraction of Milk. II. The Effect of Synergists, Metallic Catalysts and pH1,2

J. W. Stull3, E. O. Herreid and P. H. Tracy

Illinois Agricultural Experiment Station, Urbana

ABSTRACT

In a study of the synergistic action of several materials, Clausen et al. (1) found that methionine and ascorbic acid were two of the most effective synergists. Citric acid is used commercially as a synergist with antioxidants. For this reason, it was thought to be important to study the synergistic action of methionine, ascorbic acid and citric acid with the antioxidant nordihydroguaiaretic acid (NDGA) in the phospholipid fraction of milk. At the same time it was determined whether or not NDGA alone or together with a synergist such as citric acid would retard oxygen absorption in the phospholipid fraction when the antioxidant and synergist are added to the system after the oxidation reaction has been allowed to proceed for a period of time.

Veno and Saida (6) made a study of the effect of several metallic "catalyzers" on the oxygen absorption of unsaturated oils. They studied vanadium, cobalt, nickel, copper, manganese, iron and lead, all as the linoleates.

FOOTNOTES

1 The data published here are taken from a thesis presented by the senior author to the Faculty of the Graduate School, University of Illinois, in partial fulfillment of the requirements for the degree of Doctor of Philosophy, June, 1950.

2 This investigation was aided by a grant from the Wm. J. Stange Co., Chicago, Ill.

3 Now at the University of Arizona, Tucson.






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Copyright © 1951 by the American Dairy Science Association ®.