EDTA was found to be the most efficient inhibitor of iron induced oxidation in the
emulsions, as it could inhibit both the initial drop and the following linear oxygen
uptake rate very efficiently. When EDTA was added in twice the ratio to iron, the
initial drop was almost undetectable. This was significantly better than for propyl
gallate and caffeic acid which were able to reduce the drop about 80% when they
were added in a ratio of 20 times to iron. α-Tocopherol reduced the drop about 80%
when the ratio of α-tocopherol to iron was about 12, thus it was more efficient than
the propyl gallate and caffeic acid, but less efficient than EDTA. Citric acid was not
able to reduce the initial drop at any of the tested concentration which was thought to
be due to its inability to bind Fe2+ at the pH of the emulsion, but it efficiently reduced
the following linear oxygen uptake rate in a similar manner to EDTA. The inhibition of
oxidation by EDTA and citric acid shows how iron induced oxidation of lipids can
efficiently be counteracted by removal of iron from the system.