Fractionation method of lipid

The present invention provides a fractionation method for lipids using liquefied dimethyl ether as a solvent. The A microbial biomass, subjected to extraction with liquefied dimethylether as solvent, a method of fractionating lipids using a separation selectivity to lipid. The microbial biomass subjected to extraction with liquefied dimethylether as solvent by fractionating a portion of lipids using a separation selectivity for lipids, to modify the fatty acid composition of lipid remaining in the microbial biomass and further, a method for producing a lipid extract lipids fatty acid composition is modified. .BACKGROUND