Multipurpose sampler (MPS) systems for automated sample preparation and derivatization of fatty acids of the phospholipid fraction from human plasma samples. (a) MPS single beam for phospholipid extraction. 1) Solid-phase extraction (SPE) MPS Beam; 2) syringe holder; 3) 1 mol/l saline reservoir; 4) solvent reservoirs; 5) three-position tray holder, 6) SPE cartridge tray; 7) SPE/blowdown; 8) vortex/centrifuge. (b)) Dual-beam MPS system for phospholipid hydrolysis, derivatization and injection. 1) Derivatization MPS beam; 2) derivatization syringe holder; 3) injection MPS beam; 4) injection syringe holder; 5) heated zone; 6) wash vials; 7) SPE/blowdown; 8) solvent reservoirs; 9) four-position tray holder; 10) agitator.