Murano Yoshihiro, Funabashi Tomoko, Takeuchi Hiroyuki, Matsuo Tatsuhiro
The Nisshin OilliO Group, Ltd., Yokosuka, Kanagawa, Japan.
J Oleo Sci. 2010;59(9):457-62. doi: 10.5650/jos.59.457.
We previously reported that the feeding of soybean phospholipids to fish increased the storage stability of n-3 polyunsaturated fatty acids (PUFA)-rich fish fillets. In this study, we examined the storage stability of lipids extracted from fish fed a diet containing soybean phospholipids and fish oil. Rainbow trout were divided into two groups, and were fed an either 2.5% soybean phospholipids (test) or no phospholipids (control) containing diet for 4 weeks. Lipids were extracted from fish fillets after the feeding period, and were subjected to an oxidation test. Lipids extracted from the fillets of fish in the test group exhibited lower values of oxygen absorption than those in the control group, and the degradation of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) was inhibited. Higher percentages of DHA and EPA were bound to phosphatidylcholine and phosphatidylethanolamine in the extracted lipids in the test group than in the control group. These results indicate that the oxidative stability of lipids extracted from fish fed soybean phospholipids is high, and that the higher percentages of DHA and EPA in PC and PE may have resulted in the higher stability of the lipids extracted from fish fillet.
我们之前报道过，给鱼类投喂大豆磷脂可提高富含n-3多不饱和脂肪酸（PUFA）的鱼片的储存稳定性。在本研究中，我们检测了从投喂含大豆磷脂和鱼油饲料的鱼类中提取的脂质的储存稳定性。虹鳟鱼被分为两组，分别投喂含2.5%大豆磷脂的饲料（试验组）或不含磷脂的饲料（对照组），为期4周。投喂期结束后，从鱼片中提取脂质，并进行氧化试验。试验组鱼片中提取的脂质的吸氧值低于对照组，二十二碳六烯酸（DHA）和二十碳五烯酸（EPA）的降解受到抑制。试验组提取的脂质中，与磷脂酰胆碱和磷脂酰乙醇胺结合的DHA和EPA的百分比高于对照组。这些结果表明，从投喂大豆磷脂的鱼类中提取的脂质的氧化稳定性较高，且PC和PE中较高百分比的DHA和EPA可能导致了从鱼片中提取的脂质具有更高的稳定性。
