Structural characterization of heparins from different commercial sources

Area of Science:

• Pharmaceutical Science
• Biochemistry
• Analytical Chemistry

Background:

• Heparin is a critical anticoagulant drug.
• Variability in commercial heparin preparations can impact therapeutic efficacy.
• Understanding these variations is essential for developing generic bioengineered heparin.

Purpose of the Study:

• To characterize the physicochemical properties and binding affinities of commercial heparin active pharmaceutical ingredients.
• To identify structural differences and variability among heparins from different manufacturers.
• To provide data for the design and synthesis of generic bioengineered heparin.

Main Methods:

• Physicochemical characterization using polyacrylamide gel electrophoresis, size exclusion chromatography, and nuclear magnetic resonance (NMR) spectroscopy.
• Disaccharide composition analysis via high-performance liquid chromatography (HPLC)-mass spectrometry after enzymatic digestion.
• Heparin oligosaccharide mapping and binding affinity evaluation using surface plasmon resonance (SPR).

Main Results:

• All heparins showed comparable molecular weight properties across multiple analytical techniques.
• Significant variability was observed in disaccharide composition and structural features among different heparin samples.
• Binding affinities to antithrombin III and thrombin varied, correlating with structural differences.

Conclusions:

• Commercial heparins, despite similar molecular weights, possess distinct structural profiles.
• These structural variations influence biological activity, specifically binding to key proteins.
• The detailed characterization provides a foundation for creating standardized, bioengineered heparin therapeutics.