我国10种铁核桃油的组成特性和氧化稳定性

选取我国新疆、云南和西藏三大主要产区的10种代表性铁核桃样品,制备铁核桃油,测定了铁核桃油的脂肪酸组成,总酚、生育酚、植物甾醇含量及氧化稳定性,采用化学计量学的方法对铁核桃油的组成特性进行分析。结果表明:我国铁核桃油的脂肪酸主要为亚油酸(54.84%~66.97%),油酸(15.88%~26.04%),亚麻酸(6.82%~12.25%)和棕榈酸(5.12%~7.62%)。微量伴随物生育酚含量176.89~832.86 mg/kg、植物甾醇含量530.96~1 095.47 mg/kg、总酚含量1.42~15.84 mg/kg,氧化稳定性指数(OSI)为0.55~3.39 h。基于回归分析发现,影响铁核桃油氧化稳定性的主要组成物质是亚油酸、亚麻酸、γ-生育酚和总酚。

Composition characteristics and oxidation stability of ten Juglans sigillata oils in China

Ten representative Juglans sigillata samples were collected from three main producing areas of Xinjiang,Yunnan and Tibet to prepare Juglans sigillata oil,and the fatty acid composition,contents of total phenol,tocopherol and phytosterol,and oxidative stability of Juglans sigillata oil were determined,also the composition characteristics of Juglans sigillata oil was analyzed by chemometrics. The results showed that linoleic acid( 54. 84%-66. 97%),oleic acid( 15. 88%-26. 04%),linolenic acid( 6. 82%-12. 25%) and palmitic acid( 5. 12%-7. 62%) were the main fatty acid of Juglans sigillata oil,the contents of tocopherol,phytosterol and total phenol were 176. 89-832. 86 mg/kg,530. 96-1 095. 47 mg/kg and 1. 42-15. 84 mg/kg,respectively,and the oxidative stability indexes( OSI) were0. 55-3. 39 h. Based on multivariate linear regression analysis,it was found that linoleic acid,linolenic acid,γ-tocopherol and total phenol were the main components that affected the oxidation stability of Juglans sigillata oil.