Overview
Heparin is a glycosaminoglycan (GAG) with potent anticoagulant properties, primarily derived from animal tissues such as porcine intestine or bovine lung. It has been a cornerstone in anticoagulation therapy since its discovery in the early 20th century. Heparin works by activating antithrombin III, which inhibits thrombin and other clotting factors. Due to its critical role in preventing thrombosis, heparin is classified as an essential medicine by the WHO. It is available in various forms, including unfractionated heparin (UFH) and low-molecular-weight heparin (LMWH), each with distinct pharmacokinetic profiles and clinical applications.
Physical and Chemical Properties
Heparin is a highly sulfated, linear polysaccharide composed of repeating disaccharide units. Its molecular weight varies significantly depending on the preparation method, ranging from 3,000 to 30,000 Da. The compound is hygroscopic and typically appears as a white to off-white powder. Heparin is highly soluble in water due to its polar sulfate groups but is insoluble in organic solvents like ethanol. Its anticoagulant activity is pH-dependent, with optimal stability in neutral to slightly acidic conditions. The substance decomposes upon heating and must be stored under controlled conditions to maintain efficacy.
Main Applications
Heparin's primary use is in clinical settings to prevent and treat thromboembolic disorders, such as deep vein thrombosis (DVT) and pulmonary embolism (PE). It is also used during surgeries, including cardiopulmonary bypass, to prevent clot formation in extracorporeal circuits. Beyond anticoagulation, heparin is employed in dialysis to prevent clotting in the extracorporeal circuit. Research applications include its use as a growth factor stabilizer in cell culture media. LMWH derivatives, like enoxaparin, offer longer half-lives and more predictable dosing for outpatient care.
Safety and Storage
Heparin requires careful handling due to its potent anticoagulant effects. Overdose can lead to severe bleeding, necessitating close monitoring of activated partial thromboplastin time (aPTT) in clinical use. Protamine sulfate is the antidote for heparin overdose. Storage conditions are critical to maintaining heparin's stability. It should be kept in a dry, airtight container at 2-8°C, protected from light and moisture. Bulk procurement must include certificates of analysis (CoA) to verify potency and purity, as contamination (e.g., oversulfated chondroitin sulfate in 2008) has led to fatal adverse events.
B2B Procurement Guide
B2B buyers of heparin should prioritize suppliers with compliance to pharmacopeial standards (USP, EP) and traceable sourcing (e.g., EU-approved porcine facilities). Key procurement criteria include activity units per milligram (typically 150-200 IU/mg for UFH), endotoxin levels (<0.5 IU/mg), and protein content (<1%). Prices vary by source and purity, with porcine-derived heparin typically commanding a premium due to stricter regulatory oversight. Large-volume buyers may negotiate contracts with manufacturers directly, while smaller quantities are available through specialized chemical distributors. Always audit suppliers for Good Manufacturing Practice (GMP) certification.
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