| The peony seed oil was respectively extracted by low temperature pressing, solvent extraction and ultrasound-assisted extraction. On the basis of comparison of oil extraction rate, the physicochemical indexes, fatty acid compositions and trace active component contents of peony seed oils of different extraction methods were determined. The results showed that the oil extraction rates of solvent extraction and ultrasound-assisted extraction were higher than that of low temperature pressing. The effects of three extraction methods on the fatty acid composition and content of peony seed oil were not obvious, the contents of unsaturated fatty acids and linolenic acid were 92.98%-93.33% and 42.58%-44.17%, respectively. The effects of extraction methods on the physicochemical index and contents of trace active components of peony seed oil were obvious. The acid value and peroxide value of peony seed oil extracted by low temperature pressing was lower, while the contents of VE, sterol and squalene were higher, which were 51.8, 322, 4.9 mg/100 g. The peony seed oil extracted by low temperature pressing had higher nutritional value. |
