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Accelerated stability studies of heparin

K A Jandik1, D Kruep, M Cartier

  • 1College of Pharmacy, University of Iowa, Iowa City 52242, USA.

Journal of Pharmaceutical Sciences
|January 1, 1996
PubMed
Summary

Heparin stability was studied under acidic, basic, and neutral conditions. Heparin rapidly degrades at 100°C after 500 hours, losing significant anticoagulant activity due to hydrolysis and desulfation.

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Area of Science:

  • Biochemistry and Pharmacology
  • Drug Stability and Degradation Studies

Background:

  • Heparin is a critical anticoagulant medication.
  • Understanding heparin's stability is vital for its safe and effective clinical use.
  • Degradation can impact therapeutic efficacy and safety.

Purpose of the Study:

  • To investigate the degradation pathways of heparin under various conditions.
  • To determine the stability profile of heparin over extended periods.
  • To identify the chemical changes associated with heparin degradation.

Main Methods:

  • Incubation of sodium heparin in acidic (0.1 N HCl) and basic (0.1 N NaOH) solutions at 30°C and 60°C.
  • Analysis of degradation products using UV spectroscopy and gradient polyacrylamide gel electrophoresis.
  • Incubation of heparin in phosphate buffer at 100°C and monitoring its stability and anticoagulant activity (anti-factor Xa and anti-factor IIa) over time.

Main Results:

  • Basic conditions induced beta-elimination at uronic acid residues (UV max at 232 nm).
  • Acidic conditions led to desulfation and hydrolysis of glycosidic linkages, reducing molecular weight.
  • Heparin remained stable for 500 hours at 100°C in buffer, then rapidly degraded, losing 80-90% of its activity by 1000-2000 hours.
  • Degradation was linked to the buffering capacity being overwhelmed by acidic byproducts, causing a pH drop.

Conclusions:

  • Heparin degradation involves hydrolysis of glycosidic linkages and loss of sulfation, particularly N-sulfate groups.
  • Degradation pathways under neutral, high-temperature conditions resemble those in acidic environments.
  • Further quantitative studies are needed to isolate and characterize specific heparin degradants.

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