Protein G-Sepharose beads are prepared by covalently coupling recombinant Protein G to 6% cross-linked Sepharose beads. BioVision Protein G (Cat. # 6510) is a genetically engineered protein containing three IgG-binding regions of native Protein G. The cell wall binding region, albumin binding region and other non-specific regions have been eliminated from the recombinant Protein G to ensure the maximum specific IgG binding. The coupling technique is optimized to give a higher binding capacity for IgG & minimum leaching of recombinant Protein G. The IgG binding capacity of Protein G-Sepharose is >20 mg of human or rabbit IgG per ml of wet beads. Protein G-Sepharose beads display high chemical & physical stability as well as high flow rate, hydrophilicity & high gel strength. It can be used for IgG purification and immunoprecipitation.