Overview
Homovanillic Acid (HVA) is a key metabolite of dopamine, formed through the enzymatic breakdown of this neurotransmitter. It is widely recognized as a biomarker for dopamine turnover in the central nervous system. Researchers and clinicians measure HVA levels in cerebrospinal fluid, blood, or urine to assess dopamine-related neurological and psychiatric conditions. As a phenolic acid derivative, HVA plays a crucial role in medical diagnostics and research. Its stable chemical nature and specific metabolic pathway make it particularly valuable for studying disorders such as Parkinson's disease, schizophrenia, and neuroblastoma. The compound's reliability as a biomarker has made it a standard reference in clinical laboratories worldwide.
Physical and Chemical Properties
Homovanillic Acid appears as a white to off-white crystalline powder with a molecular weight of 182.17 g/mol. It melts at approximately 142-145°C and demonstrates good solubility in polar solvents like water, methanol, and ethanol. The compound's chemical structure includes both phenolic and carboxylic acid functional groups, contributing to its stability and reactivity patterns. The substance shows typical acid-base behavior, with pKa values around 4.4 for the carboxylic group and 9.8 for the phenolic hydroxyl group. These properties influence its extraction and analysis methods in biological samples. HVA is relatively stable under standard storage conditions but may degrade when exposed to prolonged light or elevated temperatures.
Main Applications
In clinical settings, HVA measurement serves as a non-invasive method to evaluate dopamine metabolism. Elevated or reduced levels often indicate neurological disorders or medication effects. Psychiatric research uses HVA levels to study schizophrenia and depression, where dopamine dysregulation is implicated. The pharmaceutical industry employs HVA as a reference standard in drug development, particularly for medications affecting dopamine pathways. Additionally, HVA testing aids in diagnosing and monitoring neuroblastoma in pediatric patients. Some research applications extend to studying the blood-brain barrier function and neurodegenerative disease progression.
Safety and Storage
While HVA is not classified as highly hazardous, standard laboratory precautions should be followed. Avoid inhalation of dust and prevent contact with skin or eyes. Use appropriate personal protective equipment including gloves and safety glasses when handling the substance. For long-term stability, store HVA in tightly sealed containers at 2-8°C, protected from light and moisture. Under these conditions, the compound typically maintains stability for several years. Always check for discoloration or other signs of degradation before use in sensitive applications such as clinical diagnostics or research studies.
B2B Procurement Guide
When sourcing HVA for research or clinical use, prioritize suppliers with documented quality control processes. Key specifications to verify include purity (typically ≥98%), heavy metal content, and residual solvent levels. Many applications require analytical certificates with each batch. Consider ordering from specialized biochemical suppliers who can provide technical support and batch-specific data. For large-scale purchases, negotiate pricing tiers and confirm lead times, as some high-purity grades may require synthesis time. International shipments may need special documentation for customs clearance due to the compound's biochemical nature.
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