Effects of Different Extraction Methods on Fatty Acid Composition and Element Migration of Sea Buckthorn Seed Oil
As a functional oil,sea buckthorn(Hippophae rhamnoides)seed oil is processed in various ways,but it is not clear whether different processing ways affect the composition of oil and the content of inorganic elements.The seeds of Hippophae rhamnoides from two different habitats were used as raw materials,seed oil was extracted by soxhlet extraction method,ultrasonic extraction method and reflux extraction method.The extraction rate,fatty acid types and relative contents,the contents of 24 inorganic elements in oil and residue were analyzed.The results showed that ultrasonic extraction method had the highest yield of oil and was less limited by the characteristics of raw materials.The relative contents of fatty acids obtained from the same raw materials by different extraction methods were similar(P＞0.05),and the relative contents of linoleic acid,α-linolenic acid and oleic acid of the two raw materials were significantly different(P＜0.01).Be,B,Al,Ti,V,Cr,Fe,Ga,As,Sn,Sb,Ba and Pb were more easily transferred from raw materials to oils,and these elements were more easily enriched in oils by Soxhlet extraction method.The results of this study can provide reference for processing method and raw material selection of sea buckthorn seed oil,and provide basis for screening oil risk factors.
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