Gel electrophoresis is an important protein analysis method, which includes multiple techniques such as sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and isoelectric focusing (IEF). SDS-PAGE is the most commonly used technique in protein analysis, providing a simple way to estimate the molecular weight of proteins, evaluate sample complexity or preparation purity, and monitor products obtained during chromatography or other purification processes.