In order to obtain high-quality Acer truncatum seed oil,the supercritical carbon dioxide extraction method was used to extract Acer truncatum seed oil,and the process conditions were optimized through single factor experiment and response surface methodology using the oil extraction rate as an indicator.The fatty acid composition,physicochemical indexes,and contents of sterol and tocopherol of the Acer truncatum seed oil were analyzed.The results showed that the optimal process conditions for supercritical carbon dioxide extraction of Acer truncatum seed oil were particle size 380-830 μm(20-40 meshes),carbon dioxide flow rate 28 L/h,extraction temperature 37℃,extraction pressure 44 MPa,and extraction time100 min.Under these conditions,the oil extraction rate reached(98.7±0.2)%.The nervonic acid content in Acer truncatum seed oil was as high as 9.34%,and the total unsaturated fatty acid content was 86.7%.The physicochemical indexes of Acer truncatum seed oil were in line with the relevant standards,and its total sterol and total tocopherol contents were 988.1 μg/g and 991.4 μg/g,respectively.The comprehensive quality of Acer truncatum seed oil extracted by supercritical carbon dioxide extraction was better than that of the oil extracted by hexane extraction and low-temperature pressing.In summary,the supercritical carbon dioxide extraction method has a high oil extraction rate and excellent product quality,which is a green and efficient oil extraction technology.
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