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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood
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Heparin characterization: challenges and solutions.

Christopher J Jones1, Szabolcs Beni, John F K Limtiaco

  • 1Department of Chemistry, University of California, Riverside, California 92521, USA. cjone004@ucr.edu

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|April 8, 2011
PubMed
Summary
This summary is machine-generated.

Characterizing heparin, a vital anticoagulant, is difficult due to its complex structure. This review details methods like mass spectrometry to analyze heparin

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Pharmacology

Background:

  • Heparin is a critical pharmaceutical anticoagulant with complex molecular characteristics.
  • Its sequence microheterogeneity and size polydispersity pose significant analytical challenges.
  • Unlike template-biosynthesized molecules, heparin undergoes enzymatic remodeling, leading to variable sulfonation patterns and uronic acid epimers.

Purpose of the Study:

  • To review the bottom-up analytical strategies for determining heparin sequence information.
  • To discuss the challenges and opportunities in the molecular-level characterization of heparin.
  • To illustrate the structure-elucidation process using a heparin-derived hexasaccharide.

Main Methods:

  • Depolymerization of heparin into smaller oligosaccharides.
  • Size- and charge-based separation techniques.
  • High-sensitivity mass spectrometry and nuclear magnetic resonance spectroscopy for structural identification.

Main Results:

  • Established a comprehensive bottom-up approach for heparin structural analysis.
  • Identified key enzymatic modifications affecting heparin structure, including O- and N-sulfonation and uronic acid epimerization.
  • Demonstrated the application of these methods for elucidating the structure of a specific heparin-derived hexasaccharide.

Conclusions:

  • The bottom-up approach, combining enzymatic degradation, separation, and advanced spectroscopy, is essential for characterizing complex heparin structures.
  • Understanding heparin's structural heterogeneity is crucial for its effective pharmaceutical application.
  • Future analytical improvements are needed to enhance the precision and efficiency of heparin characterization.