Clinical Chemistry
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Clinical Chemistry 45: 394-399, 1999;
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(Clinical Chemistry. 1999;45:394-399.)
© 1999 American Association for Clinical Chemistry, Inc.

Articles

Evaluation of a New Method for the Analysis of Free Catecholamines in Plasma Using Automated Sample Trace Enrichment with Dialysis and HPLC

John Dutton1, Andrew J. Hodgkinson1, George Hutchinson2 and Norman B. Roberts1,a

1 Department of Clinical Chemistry, Royal Liverpool and Broadgreen University, Hospital NHS Trust, Liverpool L7, 8XP, United Kingdom.

2 Anachem Ltd, Luton LU2 0EB, United Kingdom.
a Author for correspondence. Fax 44 (1)51 706 5813.

Background: Analysis of urinary free catecholamines was automated recently, but analysis of plasma samples posed special difficulties. The present study was undertaken to evaluate a new method for the automated analysis of plasma catecholamines.

Methods: The procedure is based on an improved sample handling system that includes dialysis and sample clean-up on a strong cation trace-enrichment cartridge. The catecholamines norepinephrine, epinephrine, and dopamine are then separated by reversed-phase ion-pair chromatography and quantified by electrochemical detection.

Results: Use of a 740-µL sample is required to give the catecholamine detection limit of 0.05 nmol/L and analytical imprecision (CV) between 1.1% and 9.3%. The assay can be run unattended, although >12 h of analysis time is not recommended without cooling of the autosampler rack. Comparison (n = 68) of the automated cation-exchange clean-up with the well-established manual alumina procedure gave excellent agreement (mean, 3.78 ± 2.76 and 3.8 ± 2.89 nmol/L for norepinephrine and 0.99 ± 1.72 and 1.08 ± 1.78 nmol/L for epinephrine). Hemodialysis had no clear effect on plasma norepinephrine. Epinephrine concentrations were similar (0.05 < P < 0.1) in chronic renal failure patients (0.24 ± 0.3 nmol/L; n = 15) and healthy controls (0.5 ± 0.24 nmol/L; n = 31). Dopamine was not quantified, being usually <0.2 nmol/L.

Conclusion: The availability of such a fully automated procedure should encourage the more widespread use of plasma catecholamine estimation, e.g., after dialysis, exercise, or trauma/surgery and in the investigation of catecholamine-secreting tumors, particularly in the anuric patient. © 1999 American Association for Clinical Chemistry




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