Abstract
Metal ions (Zn2+ and Fe3+) are transferred from water into vegetable and marine oils when these oils contain phospholipids. Ions present in the oil may be exchanged with the same or with other kinds of cations in a water phase in contact with the oils. Radioactive isotopes of zinc and iron were used for measuring the exchange rate. The sequestering action by the oil strongly depends on the contents of phospholipids and reaches a maximum (ions v/s phospholipids) in the concentration range between 3 and 60 ppm of phospholipids (0.1–2 ppm of phosphorus) in the oil. The same sequestering effect is demonstrated when purified phospholipids (phosphoethanolamine and acetone-refined soybean lecithin) are added to edible oils from which the natural content of phospholipids has been removed. Free fatty acids do not appear to sequester multivalent ions nor to influence the sequestering action by the phospholipids when added to the oil.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Lundberg, W.O., and P. Järvi, in “Progress in the Chemistry of Fats and Other Lipids,” Vol. IX, Part 2, Edited by R.T. Holman, Pergamon Press, New York, NY, 1968, pp. 377–406.
Lunde, G., JAOCS 48:517 (1971)
Lunde, G., “The Analysis and Characterization of Trace Elements, in Particular, Bromine, Setenium and Arsenic in Marine Organisms,” CI Report No. 1039, Central Institute for Industrial Research, Blindern, Oslo, Norway, 1974, p. 23.
Lunde, G., J. Sci. Food Agric. 19:432 (1968).
Author information
Authors and Affiliations
About this article
Cite this article
Lunde, G., Landmark, L.H. & Gether, J. Sequestering and exchange of metal ions in edible oils containing phospholipids. J Am Oil Chem Soc 53, 207–210 (1976). https://doi.org/10.1007/BF02633306
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02633306