Figure 3. Changes the smoke points of the virgin sesame (VSO), refined sesame (RSO), and refined olive (ROO) oils during the frying process at 180 °C. Means ± SD (standard deviation) for each oil over time with the same lowercase letters are not significantly different at P < 0.05. Means ± SD in each time point with the same uppercase letters are not significantly different at P < 0.05.