3.3. Thermal oxidative stability analysis
In this stage, the samples containing different forms of
nano-encapsulated olive leaf extract (as shown in Table 1) along
with a sample with unencapsulated olive leaf extract and one with
TBHQ as a synthetic antioxidant were analyzed for oxidative stability
by Rancimat test. According to our results revealed in Fig. 2, the
highest thermal stability was for the oil sample containing TBHQ
with a concentration of 200 mg/kg. Also, increasing the concentration
of TBHQ from 100 to 200 mg/kg resulted in a significant
increase in thermal stability of soybean oil (P < 0.05)