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Versatile, non-clotting-based heparin assay requiring no instrumentation
Clinical Chemistry
|June 1, 1991
Summary
A novel, instrument-free heparin assay uses protamine-coated paper to detect heparin concentration. This simple method visually estimates heparin levels in plasma within minutes, offering a practical alternative to traditional assays.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Medical Diagnostics
Background:
- Heparin monitoring is crucial in clinical settings.
- Existing heparin assays often require specialized instrumentation.
- A need exists for rapid, point-of-care heparin detection methods.
Purpose of the Study:
- To develop a non-clotting-based, instrument-free assay for heparin quantification.
- To utilize protamine immobilization on filter paper for heparin detection.
- To establish a visual and rapid method for estimating heparin concentrations in plasma.
Main Methods:
- Protamine was immobilized onto porous filter paper strips.
- Heparin samples were applied, and capillary migration was monitored.
- Methylene Blue NNX staining visualized heparin adsorption, with purple color intensity indicating concentration.
- Assay time was approximately 6 minutes for plasma samples.
Main Results:
- The assay demonstrated a visual correlation between heparin concentration and the length of the purple region.
- Heparin concentrations in plasma (2 to 35 int. units/mL) were successfully differentiated.
- Results showed excellent agreement with conventional heparin assays (r > 0.99, n = 48).
Conclusions:
- A simple, instrument-free heparin assay based on protamine-treated paper has been successfully developed.
- The method provides a rapid and visually interpretable estimation of heparin levels in plasma.
- This assay offers a promising alternative for point-of-care heparin monitoring.