| The moisture content and oil content of Idesia polycarpa Maxim. seed and the acid value, peroxide value, saponification value, fatty acid composition, contents of vitamin E, total phenol, squalene and β-sitosterol of Idesia polycarpa Maxim. seed oil were determined to study the effects of different drying methods on the physicochemical properties, fatty acid composition and trace nutrient contents of Idesia polycarpa Maxim. seed oil. In addition, the quality of the oil was evaluated by principal component analysis. The results showed that the acid value and saponification value of Idesia polycarpa Maxim. seed oil decreased in the order of drying in the shade, drying in the sun and drying over heat. The peroxide value and β-sitosterol content from high to low were drying in the sun, drying over heat and drying in the shade,and the squalene content from high to low were drying over heat, drying in the shade and drying in the sun. The VE content for drying in the sun was the highest, and the VE contents for the other two methods were similar. No obvious difference was found for the total phenol of the oils by the three drying methods. In a word, the physicochemical properties of Idesia polycarpa Maxim.seed oil drying in the sun was better than the other two methods, and the loss of nutrient content was the lowest. |
