不同品种葵花籽油氧化稳定性研究

Oxidative stability of oils extracted from different sunflower varieties

为研究不同品种葵花籽油的氧化稳定性,采用Schaal烘箱法连续加热12 d,分别测定葵花籽油过氧化值、酸值、碘值、共轭二烯和共轭三烯含量,并用高效液相色谱法分析亚油酸与α-生育酚含量。结果表明:在氧化过程中油葵6号过氧化值在6 d时均显著低于其他各品种,共轭二烯含量显著低于T012244和内葵杂3号,碘值在9 d时显著高于内葵杂3号但与白葵杂6号和T012244差异不显著,酸值与共轭三烯含量在12 d时均显著低于白葵6号、T012244。油葵6号过氧化值、酸值和碘值在6 d内均未超过国标规定的标准。油葵6号中亚油酸与α-生育酚含量均显著高于其他各品种。油葵6号葵花籽油氧化稳定性较强。

In order to evaluate the oxidative stability of oils extracted from different sunflower peroxide value, acid value,iodine value, contents of conjugated diene and conjugated triene of varieties, sunflower seed oils were determined after being heated continuously for 12 d using Schaal oven method. The con- tents of linoleic acid and ct - tocopherol were analyzed by high performance liquid chromatography. The results showed that the peroxide value of Youkui No. 6 was the lowest, its content of conjugated diene was markedly lower than that of T012244 and Neikuiza No. 3 on the 6th day during oxidation. The iodine val- ue of Youkui No. 6 was significantly higher than that of Neikuiza No. 3 on the 9th day, but there was no significant difference among Youkui No. 6, Baikuiza No. 6 and 3＇012244. And the acid value and content of conjugated triene of Youkui No. 6 were significantly lower than those of Baikuiza No. 6 and T012244 on the 12th day. The peroxide value,acid value and iodine value within 6 d of Youkui No. 6 did not exceed the national standard of sunflower seed oil. Besides, the contents of linoleic acid and α - tocopherol of Youkui No. 6 were the highest. It indicated that the oxidative stability of Youkui No. 6 sunflower seed oil was better.