Soybean Oil Treatment Using the Dissolving Curve Equation of Hydrogen.

The solubility of hydrogen in n-hexane was determined using a homemade reactor. The solubility of hydrogen in soybean oil was established using the Peng-Robinson (PR) equation of state and the van der Waals mixing rule. The curve equation established a linear relationship between the solubility of hydrogen in oil and the number of moles of hydrogen in the reactor. Under the optimal temperature and catalyst, the relationship between the hydrogen consumption of the hydrogenation of oil and fat and the TFAs formed in the oil was determined. When the reaction pressure exceeded 3.0 MPa, the hydrogenation of oil was consumed. The amount of hydrogen, the rate of hydrogenation, and the change in the TFAs all stabilized. Therefore, the pressure of the general hydrogenation reaction should not exceed 3.0 MPa. This result provides a quick and simple method for controlling TFAs in oils and fats for industrial applications.

Ultrasound-assisted Aqueous Enzymatic Extraction of Corn Germ Oil: Analysis of Quality and Antioxidant Activity.

An efficient method of ultrasound-assisted aqueous enzymatic extraction of corn germ oil was established, and its quality and antioxidant activity were studied. The optimum auxiliary extraction conditions with ultrasound were as follows: the ultrasonic treatment time was 20 minutes, and the ultrasonic temperature was 40°C. The corn germ oil extracted by the aqueous enzymatic method had better quality indexes in comparison with that exacted by the solvent. The fatty acid compositions of corn germ that was oil-extracted by two kinds of methods had almost no significant differences. The tea polyphenols (TP) exhibited remarkable antioxidant effects on corn germ oil during a storage stability test. Meanwhile, we focused on the antioxidant activity of corn germ oil, and the results showed that corn germ oil could effectively scavenge 1,1-diphenyl-2-picrylhydrazyl(DPPH), hydroxyl radical and superoxide anion free radicals. Thus, corn germ oil is a kind of functional oil with excellent antioxidant activity and could be used as a free radical scavenger in the food or other industries.