2.7. Peroxide Value
Peroxide value (peroxide milliequivalent/ kg of oil) was tested according to the International Dairy Federation standard method 74A (Chew & Nyam, 2016). A sample of oil (20 mg) was dissolved with 3:2 (v/v) dichloromethane/methanol solution. Peroxides react with iron(II) chloride and ammonium thiocyanate, followed by absorbance measurements at 560 nm, as explained by Chew et al. (Chew & Nyam, 2016).