Determination of plasma heparin by polybrene neutralization

Area of Science:

• Biochemistry
• Clinical Chemistry
• Pharmacology

Background:

• Heparin is a crucial anticoagulant medication.
• Accurate measurement of heparin activity is essential for therapeutic monitoring and patient safety.
• Existing methods for heparin activity determination may have limitations in certain clinical settings.

Purpose of the Study:

• To describe a novel method for quantifying heparin activity in human plasma.
• To establish a reliable assay based on the principle of heparin neutralization by Polybrene.
• To validate the accuracy and precision of the developed heparin assay.

Main Methods:

• The method involves serial incubations of human plasma with increasing concentrations of Polybrene.
• Thrombin-induced coagulation times are measured to determine the Polybrene amount needed for heparin neutralization.
• Reference curves are generated using known heparin concentrations to quantify unknown samples.

Main Results:

• The assay demonstrated a clear relationship between Polybrene concentration and heparin neutralization.
• Linear relationships were observed between Polybrene required and known heparin amounts.
• The assay exhibited coefficients of variation ranging from 4% to 10% across the tested heparin concentration range (0.05-1.0 unit/ml).

Conclusions:

• The described method provides a reliable and reproducible means to determine heparin activity in human plasma.
• This Polybrene-based assay offers a valuable tool for clinical laboratories and research settings.
• The assay's performance characteristics support its utility for therapeutic drug monitoring of heparin therapy.