However, in week 10, the AV of the control sample increased from 1.1 mg KOH/g lipid before storage to a maximal value of 2.2 mg KOH/g lipid and the samples prepared using PCHE 0.4, PCHE 0.2, BHT 0.2, and EDTA showed 1.5, 1.6, 1.6, and 1.9 mg KOH/g lipid, respectively, at 25 C (Fig. 4A).