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We describe the separation of protoporphyrin and related porphyrins by reversed-phase "high-performance" liquid chromatography, with fluorometric detection. We used the method to demonstrate that acid hydrolysis of the dimethyl ester of protoporphyrin IX is complete in 2 to 3 h and is followed by the acid-catalyzed conversion of protoporphyrin IX to a chemical species that chromatographic evidence indicates to be hematoporphyrin IX. In addition, the method was used to evaluate the purity of a commercial preparation of protoporphyrin IX and was also demonstrated to have the sensitivity and specificity needed for measuring the protoporphyrin IX content of whole-blood.
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