| In order to further research and develop woody oil resources, oils from seven kinds of woody oilcrops and four kinds of indicators (fatty acid composition, squalene, β-sitosterol and α-tocopherol) were selected for quality comprehensive evaluation. The results indicated that the content of palmitic acid in tea seed oil was the highest(16.22%).The content of oleic acid in oil-tea camellia seed oil was the highest(80.55%). The content of linoleic acid in walnut oil was the highest, reaching 59.13%. The fatty acid compositions of domestic olive oil and imported olive oil were very similar. In addition, the ratios of SFA to MUFA to PUFA of domestic olive oil, imported olive oil and oil-tea camellia seed oil were close. The contents of squalene in domestic olive oil and imported olive oil were far higher than the other five kinds of oils, reaching 4 521.8 mg/kg and 6 294.7 mg/kg, respectively. The content of β-sitosterol in seven woody oils was between 475.1 mg/kg and 2 459.2 mg/kg, and it was the highest in Korean pine seed oil. Except for walnut oil, α-tocopherol was detected in other oil samples. Cluster analysis and multidimensional scaling analysis showed that domestic olive oil and imported olive oil almost had no difference in quality. According to the principal component analysis, four kinds of principal components were extracted and the comprehensive evaluation indexes of quality of seven kinds of woody oils were established. The sequence of seven kinds of oils from high to low was: imported olive oil, domestic olive oil, oil-tea camellia seed oil, tea seed oil, torreya seed oil, Korean pine seed oil, walnut oil. |
