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Related Experiment Videos

Luminometric single step urea assay using ATP-hydrolyzing urease

B Näslund1, L Ståhle, A Lundin

  • 1Clinical Research Centre and Division of Medicine, Karolinska Institute, Huddinge University Hospital, Sweden. birgitta.naslund@roche.com

Clinical Chemistry
|September 11, 1998
PubMed
Summary

A new luminometric method accurately measures low urea levels in biological samples. This sensitive assay offers a lower detection limit than previous spectrophotometric methods, improving urea determination in clinical diagnostics.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Enzyme Kinetics

Background:

  • Accurate determination of urea in biological fluids is crucial for clinical diagnostics.
  • Existing spectrophotometric methods for urea analysis have limitations in sensitivity and detection limits.
  • Microdialysis requires sensitive assays for analyzing low analyte concentrations in small sample volumes.

Purpose of the Study:

  • To develop and validate a novel automatic enzyme kinetic luminometric method for quantifying small amounts of urea.
  • To improve upon the sensitivity and detection limits of existing urea determination techniques.
  • To enable precise urea measurement in biological fluids and microdialysates.

Main Methods:

  • Utilized an ATP-hydrolyzing urease reaction coupled with a luciferin-luciferase ATP reaction for luminescence monitoring.

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  • Optimized assay conditions, including the addition of 1,2-propanediol to enhance specificity and reduce background ATPase activity.
  • Employed multivariate analysis for comprehensive optimization of assay parameters.
  • Validated the method using biological samples like blood dialysate and plasma.

    • Main Results:

    • Achieved an assay range of 100 pmol to 50 nmol, with a detection limit of 5 micromol/L, significantly lower than previous methods.
    • Demonstrated high urea recovery rates (96-103%) in spiked blood dialysate and plasma samples.
    • Reported excellent assay precision with total coefficients of variation (CVs) ranging from 3.6% to 8.5%.
    • Exhibited high correlation (r = 0.979 for dialysate, r = 0.978 for plasma) with a spectrophotometric kit method.

    Conclusions:

    • The developed luminometric method provides a sensitive, accurate, and precise tool for determining low urea concentrations in biological samples.
    • This assay is suitable for analyzing urea in microdialysates and other biological fluids, offering advantages over traditional methods.
    • The method demonstrates robustness, with no observed interference from common metabolites or drugs, making it reliable for clinical applications.