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Clinical Chemistry, Vol 29, 878-881, Copyright © 1983 by American Association for Clinical Chemistry
P Moleman and JJ Borstrok
We describe an improved method for the assay of urinary vanillylmandelic acid by "high-performance" liquid chromatography, with electrochemical detection. A 1-mL aliquot of urine is acidified and extracted with ethyl acetate, then the ethyl acetate extract is extracted with phosphate buffer, pH 8.5. An acidified aliquot of the phosphate extract is injected into a reversed-phase column and vanillylmandelic acid is detected electrochemically. The between-day CV is 5-6% for concentrations ranging from 10 to 75 mumol/L. We also discuss the critical steps for extraction and calibration.
The following articles in journals at HighWire Press have cited this article:
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P. Moleman, J. H. M. Tulen, P. J. Blankestijn, A. J. Man in 't Veld, and F. Boomsma Urinary Excretion of Catecholamines and Their Metabolites in Relation to Circulating Catecholamines: Six-Hour Infusion of Epinephrine and Norepinephrine in Healthy Volunteers Arch Gen Psychiatry, July 1, 1992; 49(7): 568 - 572. [Abstract] [PDF] |
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