Protein A/G/L Magnetic Beads are prepared by covalently coupling Recombinant fusion Protein A/G/L (contains thirteen IgG binding domains, BV catalog # 6540) to 6% crosslinked magnetically beaded agarose. The coupling technique is optimized to give a high binding capacity for IgG. The capacity of IgG binding is generally greater than 10 mg of human IgG per ml of wet gel.