title: Preparation, high-performance liquid chromatographic separation and characterization of hexacarboxylic porphyrinogens.
abstract: A simple method for the preparation and reversed-phase high-performance liquid chromatographic separation of hexacarboxylic porphyrinogen isomers is described. Uroporphyrin I or III was partially decarboxylated in 0.5 M hydrochloric acid at 150 degrees C. Unreacted uroporphyrin and the hepta-, hexa- and pentacarboxylic porphyrins formed were esterified and then group-separated by thin-layer chromatography. After hydrolysis, the porphyrins were reduced to the corresponding porphyrinogens with 3% (w/w) sodium amalgam. The hexacarboxylic porphyrinogens were separated on an ODS-Hypersil column by elution with acetonitrile-methanol-1 M ammonium acetate, pH 5.16 (8:12:80, v/v/v) as mobile phase. Isomers were identified by high-performance liquid chromatography of the characteristic mixture of two pentacarboxylic porphyrins formed after partial decarboxylation of individual isomers. Except for the two type I isomers, resolution of the hexacarboxylic porphyrinogens was superior to that of the corresponding porphyrins.
authors.affiliation: Division of Clinical Cell Biology, MRC Clinical Research Centre, Harrow, Middlesex, U.K.
authors.forename: F M
authors.initials: FM
authors.lastname: Li
authors.forename: C K
authors.initials: CK
authors.lastname: Lim
authors.forename: T J
authors.initials: TJ
authors.lastname: Peters
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid; D004563:Electrochemistry; D011165:Porphyrinogens / Q000032:analysis*; D014578:Uroporphyrins / Q000032:analysis
chemical_list: D011165:Porphyrinogens; D014578:Uroporphyrins