The present invention relates to processes for separating a feed material intosoluble and insoluble components, by contacting a feed material and a solventand subsequently separating the solvent containing the soluble componentsfrom the insoluble components, wherein the feed material comprises one or moreof: at least 1% by mass phosphatidyl serine, at least 1% by mass sphingomyelin,at least 0.3 % by mass acylalkylphospholipids and/or plasmalogens, at least0.5 % by mass aminoethylphosphonate and/or other phosphonolipids, at least1% by mass cardiolipin, and at least 0.3% by mass gangliosides； and wherein thesolvent comprises: supercritical or near-critical CO
