Overview
Verbenalin is a naturally occurring iridoid glycoside primarily extracted from Verbena officinalis (common vervain), a plant traditionally used in European and Chinese herbal medicine. As a secondary metabolite, it contributes to the plant's bitter taste and therapeutic effects. The compound gained pharmaceutical significance due to its bioactivity in modulating GABA receptors and inhibiting inflammatory cytokines. Industrial production involves solvent extraction followed by chromatographic purification, with yields dependent on plant sourcing and extraction techniques. Recent studies highlight its potential in neurological disorder treatments, driving demand in the nutraceutical and pharmaceutical sectors.
Physical and Chemical Properties
With a molecular weight of 388.37 g/mol, verbenalin crystallizes as a white powder that darkens upon prolonged light exposure. Its iridoid structure features a cyclopentane ring fused to a pyran ring, with glucose attached at the C1 position. This configuration enhances water solubility (up to 50 mg/mL at 25°C) while maintaining stability in acidic conditions (pH 3-6). Thermogravimetric analysis shows decomposition beginning at 198°C without distinct boiling. The compound exhibits optical activity ([α]D20 = -62.5° in methanol) and UV absorption maxima at 232 nm, critical for analytical quantification. Hygroscopicity necessitates controlled humidity during storage (<60% RH).
Main Applications
In traditional medicine, verbenalin-containing extracts treat anxiety, insomnia, and liver disorders. Modern applications include: 1) Neurological formulations – as a GABA modulator for seizure disorders; 2) Anti-inflammatory drugs – inhibiting TNF-α and IL-6 production; 3) Cosmetic additives – for skin barrier enhancement in eczema treatments. Pharmaceutical companies utilize it as a reference standard for HPLC quality control of herbal products. Emerging research explores its role in neurodegenerative disease management, particularly for Alzheimer's and Parkinson's, with patented extraction methods (e.g., CN104945320B) optimizing industrial-scale production.
Safety and Storage
Classified as non-hazardous under GHS standards, verbenalin requires basic lab precautions – gloves, goggles, and dust masks during handling. LD50 studies show low acute toxicity (oral rat LD50 >2000 mg/kg), but chronic exposure may affect liver enzymes based on rodent studies. Long-term stability requires amber glass bottles or aluminum foil-wrapped containers at 2-8°C, with desiccants to prevent moisture absorption. Shelf life typically exceeds 24 months when stored properly. In manufacturing settings, explosion-proof equipment is recommended due to dust combustibility (dust explosion class St1).
B2B Procurement Guide
Industrial buyers should verify: 1) Purity certificates (HPLC ≥98%); 2) Residual solvent reports (meeting ICH Q3C guidelines); 3) Microbial limits (USP <61> compliance). Bulk orders (25kg+) commonly attract 10-15% discounts, with lead times of 4-6 weeks for custom purification. Key suppliers include phytochemical specialists like Sigma-Aldrich (analytical grade) and Xi'an Natural Field Bio-Technique Co. (GMP-compliant batches). Spot prices fluctuate with vervain harvest yields – European-sourced material typically commands 20-30% premiums over Chinese origins due to stricter agricultural controls.
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