Overview
Vasopressin, or antidiuretic hormone (ADH), is a neurohypophysial hormone synthesized in the hypothalamus and released by the posterior pituitary gland. It plays a pivotal role in homeostasis by regulating renal water reabsorption and vascular tone. Structurally, it is a nonapeptide with a disulfide bridge between cysteine residues. In clinical settings, synthetic vasopressin and its analogs (e.g., desmopressin) are used to treat conditions like diabetes insipidus and esophageal varices bleeding. Its vasoconstrictive properties also make it valuable in critical care for managing septic shock.
Physical and Chemical Properties
Vasopressin is a water-soluble peptide with a molecular weight of 1084.24 g/mol. Its stability is pH-dependent, with optimal solubility in acidic solutions. The hormone degrades at high temperatures or under prolonged exposure to light. The peptide’s biological activity relies on its cyclic structure, formed by a disulfide bond between Cys1 and Cys6. This conformation is essential for binding to V1 and V2 receptors in target tissues. Analytical methods like HPLC and mass spectrometry are used to verify its purity and structural integrity.
Main Applications
Vasopressin’s primary medical use is in managing central diabetes insipidus, where it compensates for deficient endogenous ADH. It is administered via injection or nasal spray (as desmopressin). In emergency medicine, vasopressin acts as a potent vasoconstrictor to control bleeding during surgeries or traumatic injuries. It is also included in advanced cardiac life support (ACLS) protocols for vasodilatory shock. Off-label uses include treatment for nocturnal enuresis and von Willebrand disease.
Safety and Storage
As a bioactive peptide, vasopressin requires careful handling to prevent degradation. Storage at -20°C in airtight, light-resistant containers is mandatory. Lyophilized powders are more stable than liquid formulations. Safety precautions include wearing PPE to avoid skin contact or inhalation. Overdose can lead to hyponatremia or cerebral edema due to excessive water retention. Contraindications include patients with chronic kidney disease or hypersensitivity to the hormone.
B2B Procurement Guide
When procuring vasopressin, prioritize suppliers with GMP certification and batch-specific Certificates of Analysis (CoA). Key parameters to verify include purity (≥98%), endotoxin levels (<5 EU/mg), and residual solvents. Bulk buyers should negotiate pricing for multi-gram quantities, which can reduce costs by 10–20%. Consider synthetic analogs like terlipressin for longer half-life in clinical applications. Logistics must ensure cold-chain compliance during transportation.
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