“…The USE based on n-hexane has the advantages of convenient operation, safety, time-saving, and simple equipment. [14][15][16][17][18] Clean-up methods mainly include solid-phase extraction (SPE), column chromatography, and gel permeation chromatography (GPC). Among them, SPE is one of the most widely used methods due to its simple operation, strong extraction capacity, and high extraction efficiency.…”