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Size exclusion chromatography (SEC), also known as gel permeation chromatography (GPC) and gel filtration chromatography (GFC), is a chromatographic process in which analytes are separated according to size and structure. It is used to characterise natural and synthetic polymers, biopolymers, proteins and nanoparticles.
The largest molecules are the first to leave the separation column. The smaller the molecules are, the better they can penetrate the pores of the stationary phase and the later they are eluted from the column (see illustration).