As another measurement index of lipid
oxidation reaction, IVs were determined in the mayonnaise samples.
The PCHE-added groups had significantly higher IVs than
the control. One application of the IV is for determination of the
amount of unsaturation contained in fatty acids. This unsaturation
is in the form of double bonds that react with iodine compounds.
The higher the IV, the more unsaturated the fatty acid bonds that
is present in a lipid, giving it more oxidation potential. However,
the unsaturated fatty acids in the control sample were reduced because
more unsaturated fatty acids were oxidised in this study (see
Fig. 6).
In conclusion, PCHE, which is rich in anthocyanins, possesses
good antioxidative activity in mayonnaise, and can be used as a
natural antioxidant for mayonnaise products. Hence, natural antioxidants
are valuable to increase the shelf-life of foodstuffs and
provide protection to mayonnaise, replacing synthetic antioxidants
such as BHT and EDTA.