Electrophoresis with agarose or other polyacrylamide gels is an established method to separate the biopolymers, determine their identity and purify them because both of these gels have a porous the natural world. Polyacrylamide gels are chemically cross-linked gels formed by the polymerization of acrylamide with a cross-linking agent, usually N,N’-methylenebisacrylamide.