| The basic physicochemical indexes of peony seed oil and other five kinds of vegetable oils were determined and compared.The results showed that both the acid value (2.034 mgKOH/g) and peroxide value(0.286 mmol/kg) of peony seed oil were within the limit of national standard; the iodine value of peony seed oil was 185.8 gI/100 g, indicating that peony seed oil was drying oil; the saponification value(188.1 mgKOH/g) was in accord with injection oil of national standard, therefore the quality of peony seed oil was better than that of the other five kinds of vegetable oils.Selecting rosemary extract，α-tocopherol and TBHQ as antioxidants, citric acid as synergist, the oxidative stability index(OSI) of peony seed oils added with antioxidants respectively blended in different ratios were determined by Rancimat method to screen preponderant antioxidant,then the shelf life of peony seed oil was inferred by the method of temperature extrapolation. Finally 0.02%TBHQ matched with 0.01%citric acid was selected as the preponderant antioxidant, and the shelf life of peony seed oil added with the selected preponderant antioxidant was 3 737 h,which was 27 times as long as that of peony seed oil without antioxidant, thus the storage characteristics of peony seed oil improved. |
