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Related Experiment Video

Updated: May 22, 2025

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A simpler and more sensitive modified catalytic (bleomycin detectable) iron assay.

Mohan M Rajapurkar1, Banibrata Mukhopadhyay1, Suhas S Lele1

  • 1Muljibhai Patel Urological Hospital, Nadiad, India.

Annals of Clinical Biochemistry
|March 14, 2025
PubMed
Summary

A modified bleomycin assay accurately measures catalytic iron (CI), a toxic form of free iron. This improved method is more sensitive and reproducible, detecting CI in hemodialysis patients where the original assay failed.

Keywords:
Catalytic ironacute coronary syndromeacute kidney injurylabile ironmajor adverse cardiac eventsmajor adverse kidney eventsmortalitynon-transferrin bound ironreactive oxygen species

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Area of Science:

  • Biochemistry
  • Clinical Chemistry
  • Analytical Chemistry

Background:

  • Free iron, also known as catalytic iron (CI), can generate toxic hydroxyl radicals.
  • Measuring CI is crucial, but the original bleomycin assay had accuracy and reproducibility issues due to pH variability and lack of standards.

Purpose of the Study:

  • To develop a modified, more accurate, and reproducible assay for measuring catalytic iron in serum/plasma.
  • To improve the sensitivity and clinical utility of the bleomycin-detectable iron assay.

Main Methods:

  • Modified the bleomycin assay for serum/plasma by controlling pH between 7.4-7.6 using acid-diluted iron standards.
  • Utilized Chelex resin treatments to ensure consistent pH and accurate iron standard dilutions.

Main Results:

  • Achieved high reproducibility with intra-assay coefficients of variation (CV) as low as 0.05% and inter-assay CVs as low as 0.06%.
  • Demonstrated high sensitivity, detecting catalytic iron levels down to 0.1 μmol/l.
  • Successfully measured catalytic iron in all hemodialysis patients (mean 0.66 ± 0.10 μmol/l), unlike the original assay which detected none.

Conclusions:

  • The modified bleomycin assay is reproducible, highly sensitive, and superior to the original assay.
  • This validated assay provides reliable measurement of catalytic iron, with normal values established at 0.11 ± 0.06 μmol/l.