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| Effects of different extraction methods on the properties of Tibet Prunus mira nut oils |
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| DOI： |
| KeyWord:Tibet Prunus mira nut oil fatty acid active constituent oxidation stability |
| FundProject:西藏自治区科技重大专项（XZ201901NA04）； 西藏农牧学院食品科学与工程重点学科建设项目（2017ZDXK-01） |
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| Abstract: |
| The aqueous extraction, n-hexane extraction, supercritical CO2 extraction and pressing extraction were used to extract Tibet Prunus mira nut oil, and the effects of different extraction methods on the properties of Prunus mira nut oil were studied by comparing extraction rate, physicochemical properties,fatty acid composition and content, content and composition of tocopherol and sterol, squalene content and oxidation stability of Prunus mira nut oil. The results showed that the extraction rate of Prunus mira nut oil obtained by n-hexane extraction was the highest，reaching (98.42±0.79)%.Extraction method had little influence on the refractive index and odor of the oil, but had significant influence on the iodine value, acid value, saponification value and peroxide value. There was no significant effect on the composition of fatty acids in the oils. Odd carbon fatty acids were presented in the oil with supercritical CO2 extraction, and the contents of tocopherol, sterol and squalene were highest in the oil obtained by n-hexane extraction. The predicted shelf lives at 25 ℃ of Prunus mira nut oils extracted by the four methods were in the order of aqueous extraction> n-hexane extraction > supercritical CO2 extraction > pressing extraction. |
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