Abstract
The modified ferric thiocyanate method was assessed for use in the determination of peroxide value (PV) of edible oils such as soybean oil, fish oil and shortening. A binary solvent system (ethanol : 1-butanol = 6 : 4 vol/vol) was used for this methods, which dissolve to transparency both oils and aqueous solution of color-producing reagents.
PV * of this method was based on weights of oils (S g), absorbance at 500 nm (A-As) with these of PV * = [4.15 (A-As) + 0.16] /10S for tested oils, where A is absorbance for sample solution, and As is that for blank solution. PV * results showed close agreement PV (JOCS method) in autoxidation of edible oils. This new method is applicable to the simple determination of PV of very small edible oil samples.
