The influence of Rotational Speed of Screw Press on the Phenolic Compounds, Oxidative Stability and the Chemical Characteristics of Peanut Oil

Generally the mechanical press is one of the most favorite methods for extracting oil from plant oil seeds all over the world. In this research, the effect of screw press rotation speed on phenolic compounds, oxidative stability and some physicochemical properties of peanut oil, including oil extraction efficiency, color index, acidity and DPPH Scavenging Activity  with using a completely randomized design with screw press and with three rotation speeds (11, 33 and 57 rpm) were investigated in three replications. The results showed that when the screw press rotation speed was 11 rpm, the oil extraction efficiency with 34.07 percent had the highest oil extraction efficiency. Increasing the screw press rotation speed on acidity, total phenolic compounds, color index, and DPPH Scavenging Activity increased. In this study, increasing screw press rotation speed from 11 to 57 rpm, the oxidative stability increased from 8.9 to 8.9 hours. In the end, it can be said that screw presses with a speed of 33 rpm are best suited for peanut oil extraction.