Purification Methods
Purify it by dissolving it in EtOH Hematoporphyrin and adding H2O or Et2O to give deep red crystals. It has also been recrystallised from MeOH. UV has max at 615.5, 565, 534.4 and 499.5nm in 0.1N NaOH, and 597, 619, 634, 653, 683 and 701nm in 2N HCl [Falk Porphyrins and Metalloporphyrins Elsevier, NY, p 175 1964, LCCCNo 63-19821.] It is used in the affinity chromatographic purification of Heme proteins [Olsen Methods Enzymol 123 324 1986]. The O-methyl-dimethyl ester has m 203-206o (from CHCl3/MeOH), and the O,O'-dimethyl-dimethyl ester has m 145o (from CHCl3/MeOH). [Paul Acta Chem Scand 5 389 1951, Beilstein 26 III/IV 3157, and 3158 for the HCl.]
