Supercritical Carbon Dioxide Extraction, Fatty Acid Composition, Oxidative Stability, and Antioxidant Effect of Torreya grandis Seed Oil

Torreya grandis seed oil (TGSO) extraction with supercritical carbon dioxide was explored from the extraction conditions, fatty acid composition, its oxidative stability and antioxidant activity in a bench‐scale apparatus. An L 9 (3 4 ) orthogonal design was applied to optimize extraction parameters. The results demonstrated that the maximum yield of 94.57 % was obtained at 45 MPa, 4 h and 50 °C. There were 18 kinds of compounds found within TGSO; the predominant ingredient was linoleic acid (42.02 %), followed by oleic acid (32.14 %) and dihomo‐γ‐linolenic acid (9.80 %). The IC 50 values for 1,6‐bis(diphenylphosphino) hexane radical (DPPH), hydroxyl radical (HO•) and superoxide radical (O 2 ·− ) were 5.61, 3.16 and 4.20 mg/mL, respectively.