Purity >98%. 1,2-Dipalmitoyl-sn -glycero-3-PC (L-DPPC) is a zwitterionic phosphoglyceride that can be used for the preparation of liposomal monolayers. The extent of incorporation of the enzyme Gamma-glutamyl transpeptidase in erythrocyte membranes was five times higher when proteoliposomes were prepared from L-DPPC as compared to control. L-DPPC incorporated liposomes have potential in establishing active immunotherapy with antigens exhibiting poor immunogenicity, such as glycosphingolipid antigens.