Abstract: The fatty acids of the Hovenia acerba seed were extracted using the supercritical CO2 extraction technique. Also GC and GC-MS was used to detect the quality of the seed oil. The optimized supercritical CO2 extraction conditions are as follows: an extraction pressure of 36MPa, an extraction temperature of 45℃, an extraction time of 120min, a separatorⅠpressure of 10MPa. with a crude fat yield of 8.1% and a linolenic acid content of 37.90%. The GC-MS analysis showed that the dominant fatty acids in the oil are α-Linolenic, oleic acid, linoleic ,palmitic acid, stearic acid, etc. The content of PUFA in the product is 74.76%.

Key words: Hovenia acerba； supercritical fluid extraction (SFE)； &alpha, -Linolenic； GC-MS；