title: The direct determination of porphyrin carboxylic acids. High-pressure liquid chromatography with solvent systems containing phase-transfer agents.
abstract: A novel method for separating porphyrin polycarboxylic acids is described and illustrated by its application to the direct analysis of biological (deep-sea medusae), clinical (urine) and chemical ('haematoporphyrin derivative') samples.
mesh_terms: D002264:Carboxylic Acids / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D007202:Indicators and Reagents; D011166:Porphyrins / Q000032:analysis*; D012997:Solvents
chemical_list: D002264:Carboxylic Acids; D007202:Indicators and Reagents; D011166:Porphyrins; D012997:Solvents