Protein A-Sepharose beads are prepared by covalently coupling recombinant Protein A to 6% cross-linked Sepharose beads. BioVision Protein A (Cat. # 6500, Cat. # 6500B) is a genetically engineered protein containing five IgG-binding regions of native Protein A. The cell wall binding region, albumin binding region and other non-specific regions have been eliminated from the recombinant Protein A 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 A. The IgG binding capacity of Protein A-Sepharose is ≥ 16 mg human or rabbit IgG per ml of wet beads. Protein A-Sepharose beads display high chemical & physical stability as well as hig