Generally, in biochemical protein purification applications, size exclusion chromatography (SEC) is the last step used. This technique purifies DNA and proteins based on their sizes, and it holds many advantages such as the ability to separate larger molecules from smaller molecules, remove salt contamination and it can be used for the determination of quaternary protein structure. GoldBio offers a large selection of agarose beads for size exclusion chromatography, which are excellent for your unique research needs.