Involvement of α-, γ-,and δ-Tocopherol Isomers in the Biphasic DPPH˙ Disappearance Kinetics of Pumpkin (Cucurbita pepo L.) Seed Oil or Oil Mixtures

The antioxidant activity of three types of pumpkin seed oil or oil mixtures (cold- -pressed, produced from roasted seed paste and salad) produced in the northern part of Croatia and the kinetics of their behaviour as free radical scavengers were investigated using DPPH˙. In addition, the involvement of oil tocopherol isomers (α-, γ- and δ-) in different steps of DPPH˙ disappearance and their impact on the rate of reaction were analysed. The...