To fully understand the function of a protein, it is necessary to separate it from the complex mixture of molecules to focus on the function without any influences. This reason is why protein purification is one of the crucial applications in biotechnology.

A target protein can be separated from other molecules via specific properties like molecular mass, charge, hydrophobicity or affinity to another molecule. These products leverage a protein's natural affinity to others molecules to separate and purify proteins for further studies.