Clinical Chemistry
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Clinical Chemistry 33: 1665-1667, 1987;
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Clinical Chemistry, Vol 33, 1665-1667, Copyright © 1987 by American Association for Clinical Chemistry

Optimized liquid-chromatographic method for fluorometric determination of urinary delta-aminolevulinic acid in workers exposed to lead

K Tomokuni, M Ichiba, Y Hirai and T Hasegawa

We developed a fluorometric method for determining delta-aminolevulinic acid (ALA) in urine of lead workers. A high-performance liquid chromatograph (HPLC) equipped with a fluorescence HPLC monitor is used. The detection limit for aqueous ALA is 20 micrograms/L (15 pmol of ALA in the 100-microL sample). The working linear range of urinary ALA concentration was 0.1 to 100 mg/L. In 25 lead-exposed workers, ALA values by the present method for urine correlated well with those obtained by a conventional colorimetric method (r = 0.996). The advantage of the present method for micro-determination of urinary ALA is its high sensitivity.




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Copyright © 1987 by the American Association for Clinical Chemistry.