More double bonds are present in the oil as the linoleic acid (C18:2) concentra- tion of tomato seed oil was 53.70 g/100 g . It was most likely that the antioxidants present in tomato seed oil provided protection against the reduc- tion of IV.
The AV of tomato seed oil was increased from 0.26 mg KOH/g oil to 0.84 mg KOH/g oil after 50 h of heating (P < 0.05), as shown in Fig. 2d. The increase of AV is caused by hydrolysis of phosphatides and triglycerides in oil into glycerol and free fatty acids