The analysis of PAs is relatively complicated due to high matrixeffects and their low concentrations in high lipid foodstuffs. First,during the extraction of PAs from foodstuffs, large quantities oflipids may inevitably get co-extracted with the targets due to theirhigh solubility in organic solvents. In general, the lipid contentsof foodstuffs such as milk, cheese, and oil seeds are over 3%, 10%,and 20% of the net mass, respectively, and are mainly composedof triacylglycerols, phospholipids, and sterols as well as unsatu-rated and saturated fatty acids [14]. Among these, triacylglycerolsand phospholipids cannot be easily separated from relatively mid-polar analytes in organic extracts by conventional cleanup methods[15–18] including simple liquid–liquid partitioning, gel permeationchromatography, and the SPE cartridge methods. Thus, these meth-ods are still insufficient for the determination of PAs in high lipidfoodstuffs due to the complicate matrices. Secondly, the detectionof trace amounts of PAs can easily be masked by a high concen-tration of the sample matrix. The co-extracted components couldnegatively affect the ionization efficiency of PAs due to ion sup-pression and signal enhancement, resulting in poor sensitivity andselectivity. Thus, the analytes of interest remain undetected for insufficient cleanup sample.