Erythrocyte protoporphyrin (EP) has been used for more than 30 years as an indicator of lead intoxication, iron deficiency, and porphyrias. Recently, numerous analytical problems associated with various EP methods have been reported, including a lack of consensus among investigators regarding the best calibration material or analytical procedure. We investigated commercially available protoporphyrin IX (PPIX) standard materials and measured the miDimolar absorptivity (me) of these materials, focusing on variables affecting the determination of their absorptivities. Among the five forms of PPIX available, PPIX dimethyl ester, when hydrolyzed to PPIX free acid, gave the most consistent and reproducible results. This work confirmed our earlier...
Porphyrins are naturally occurring macrocyclic compounds, which play an important role in a lot of b...
BACKGROUND: We evaluated a quality control scheme for the measurement of urinary uroporphyrin, copro...
We measured the concentration of erythrocyte protopor-phyrin in 43 blood samples by two fluorometric...
SUMMARY. Three problems with the ethyl acetate-acetic acid method of protopor-phyrin analysis were i...
introduction It has been known for years that free erythrocyte protoporphyrin (FEP)1 concentrations ...
We describe the separationof protoporphyrinand related porphyrins by reversed-phase“high-performance...
In the past, various techniques have been employed in industry and medical practice using the occurr...
In continuation of earlier work on the detection of δ-aminolevulinic acid (ALA)-induced protoporphyr...
We describe a method for simultaneously measuring concentrations of coproporphyrin, zinc protoporphy...
In this new method for simultaneous separation and quan-tification of free and metal-chelated porphy...
A fluorometric analytical method was developed for quantification of protoporphyrin IX (PpIX) in ski...
The protoporphyrinemia of iron deficiency is well recog-nized. Clinically, information on the protop...
Zinc protoporphyrin is the predominent fluorescent por-phyrin accumulating in erythocytes as a resul...
A method to determine the amount of protoporphyrin in epidermis, blood plasma, and blister fluid has...
Protoporphyrin IX (PPIX) is formed from δ-aminolevulinic acid (ALA) during heme biosynthesis. Due to...
Porphyrins are naturally occurring macrocyclic compounds, which play an important role in a lot of b...
BACKGROUND: We evaluated a quality control scheme for the measurement of urinary uroporphyrin, copro...
We measured the concentration of erythrocyte protopor-phyrin in 43 blood samples by two fluorometric...
SUMMARY. Three problems with the ethyl acetate-acetic acid method of protopor-phyrin analysis were i...
introduction It has been known for years that free erythrocyte protoporphyrin (FEP)1 concentrations ...
We describe the separationof protoporphyrinand related porphyrins by reversed-phase“high-performance...
In the past, various techniques have been employed in industry and medical practice using the occurr...
In continuation of earlier work on the detection of δ-aminolevulinic acid (ALA)-induced protoporphyr...
We describe a method for simultaneously measuring concentrations of coproporphyrin, zinc protoporphy...
In this new method for simultaneous separation and quan-tification of free and metal-chelated porphy...
A fluorometric analytical method was developed for quantification of protoporphyrin IX (PpIX) in ski...
The protoporphyrinemia of iron deficiency is well recog-nized. Clinically, information on the protop...
Zinc protoporphyrin is the predominent fluorescent por-phyrin accumulating in erythocytes as a resul...
A method to determine the amount of protoporphyrin in epidermis, blood plasma, and blister fluid has...
Protoporphyrin IX (PPIX) is formed from δ-aminolevulinic acid (ALA) during heme biosynthesis. Due to...
Porphyrins are naturally occurring macrocyclic compounds, which play an important role in a lot of b...
BACKGROUND: We evaluated a quality control scheme for the measurement of urinary uroporphyrin, copro...
We measured the concentration of erythrocyte protopor-phyrin in 43 blood samples by two fluorometric...