Oxygen-binding profile of the iron porphyrin complex embedded in polymerized liposome: Effect of the polymerized liposome on the stability and the oxygen-binding ability of the iron porphyrin complex

5,10,15,2O-Tetra(01,01,01,01-0-(2,' 2'-dimethyl-20'-(2”-trimethylarnmonioethyl) phosphonatoxyeicosanamido)phenyl)porphinatoiron(II) (lipidheme) complex embedded in polymerized liposome was prepared by polymerizing 1-(9-(p-vinylbenzoyl)nonanoyl)-2-O-octadecyl-ruc-glycero- 3-phosphocholine in the presence of lipid-heme under ultraviolet irradiation. The polymerization proceeded rapidly, and the reduction of the hemin to the heme occurred spontaneously during the polymerization. The lipid-heme complex embedded in the polymerized liposome bound molecular oxygen reversibly under physiological conditions (pH 7, 37ºC) and was chemically, physically, and mechanically stable during storage for a long period and even in a high-speed flow system. The oxygenbinding affinity was not affected by the type of medium due to the effect of the rigid polymerized liposome.