Enrichment of Palmitoleic Acid in Fish Oil by Compound Solvent Low Temperature Crystallization
To explore the enrichment process of monounsaturated fatty acids from fish oil,this study used anchovy oil as raw material and purified POA using a composite solvent low-temperature crystallization method.Compared to a single solvent,composite solvents exhibited superior performance.In order to optimize the process,single-factor experiments were conducted,considering the type and volume ratio of the solvents,massratio of fish oil to solvent,crystallization temperature,and crystallization time,with POA content and yield as indicators.The optimal process conditions were de-termined as a volume ratio of acetone to acetonitrile of 1∶10,a mass ratio of fish oil to solvent of 1∶6,a crystallization temperature of-60 ℃,a crystallization time of 6h,and the POA content was analyzed as(29.75±0.53)％in the ob-tained mixed fatty acids.Further scaling up experiments were conducted to increase the yield to around 50％,with a to-tal unsaturated fatty acid content of over 79％.This serves as a valuable reference for the enrichment process of ω-7 monounsaturated fatty acids.
anchovy oilcompound solventlow temperature crystallizationpalmitoleic acid
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