Oil
sample (2 g) was dissolved in 30 mL
chloroform: acetic acid (3:2, v/v) then
1 mL freshly prepared saturated KI
(potassium iodide) solution was added
and the mixture was vortexed for 1
min. About 30 mL distilled water and
0.5 mL starch solution were added and
the liberated iodine was titrated with
sodium thiosulfate (0.1 mol L-1).
Peroxide value in the unit meq/kg was
determined by the following equation