A rapid screening test for urinary porphyrins is described. After a preliminary purification by a batch procedure utilizing an anion exchange resin (Dowex), porphyrins are detected by visual fluorescence.
Castrow FF, Mullins JF, Flowers RH, Mills GC. Anion Exchange Resin Screening Test for Urinary Porphyrins. Arch Dermatol. 1967;96(2):204–205. doi:10.1001/archderm.1967.01610020096027
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