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Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
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Urinary oxalate and citrate.

R P Holmes1, M Kennedy

  • 1Department of Urology, Wake Forest University School of Medicine, Winston-Salem.

Methods in Molecular Medicine
|March 5, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces capillary electrophoresis as a rapid method for measuring urinary oxalate and citrate, key factors in kidney stone formation. This technique offers a faster, more accessible alternative to traditional enzyme assays and ion chromatography.

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Area of Science:

  • Clinical Chemistry
  • Analytical Chemistry
  • Biochemistry

Background:

  • Urinary oxalate and citrate levels are critical indicators for calcium oxalate kidney stone risk.
  • Current enzyme-based assays for these analytes can be affected by urine matrix components, necessitating sample cleanup.
  • Ion chromatography is suitable but less common due to cost, time, and equipment demands.

Purpose of the Study:

  • To develop a rapid and efficient method for quantifying urinary oxalate and citrate.
  • To enable simultaneous measurement of other relevant anions like chloride and sulfate.
  • To provide a valuable tool for calculating urine supersaturation relevant to kidney stone formation.

Main Methods:

  • Utilized capillary electrophoresis for simultaneous determination of oxalate and citrate.
  • Employed indirect absorption detection by monitoring chromate displacement in the electrolyte.
  • Optimized electrolyte composition for efficient anion migration and detection.

Main Results:

  • Demonstrated the capability of capillary electrophoresis for rapid oxalate and citrate analysis in a single run.
  • Showcased simultaneous measurement of chloride and sulfate alongside oxalate and citrate.
  • Validated the indirect absorption detection method for accurate anion quantification.

Conclusions:

  • Capillary electrophoresis offers a fast and effective alternative for analyzing key urinary stone-forming risk factors.
  • This method simplifies sample preparation and reduces analytical time compared to existing techniques.
  • The developed assay supports improved risk assessment for calcium oxalate kidney stones.