Overview
Menadione, chemically known as 2-methyl-1,4-naphthoquinone, is a synthetic form of vitamin K. Unlike natural vitamin K1 (phylloquinone) and K2 (menaquinones), menadione requires biological conversion to become active. It is widely utilized as a cost-effective nutritional fortifier in animal feed to prevent vitamin K deficiency, which can lead to bleeding disorders and poor bone development. In pharmaceuticals, menadione is used in specific formulations, though its application in human nutrition is restricted in some regions due to potential toxicity concerns. Its stability and bioavailability make it a preferred choice in industrial-scale feed production, particularly for poultry and swine.
Physical and Chemical Properties
Menadione appears as a bright yellow crystalline powder with a characteristic naphthoquinone structure. It is thermally stable up to 305°C but decomposes at higher temperatures. The compound is lipophilic, dissolving readily in organic solvents like ethanol or acetone but exhibiting negligible solubility in water. Its oxidative properties enable it to participate in redox reactions, a key mechanism in its role as a vitamin K precursor. The methyl group at the 2-position differentiates it from other naphthoquinones, influencing its metabolic pathway. Storage requires protection from UV light and humidity to prevent degradation.
Main Applications
The primary use of menadione is in animal nutrition, where it is added to feed (typically at 1-10 mg/kg) to ensure adequate vitamin K levels. It supports blood coagulation and bone health in livestock, poultry, and aquaculture species. In poultry, deficiencies can result in hemorrhagic syndrome, making supplementation critical. Pharmaceutical applications include its use in injectable formulations (e.g., menadione sodium bisulfite) for treating vitamin K-dependent clotting factor deficiencies. Industrial uses extend to chemical synthesis, where it serves as an intermediate for dyes and antioxidants. Regulatory approvals vary by region, with the EU restricting human dietary use.
Safety and Storage
Menadione exhibits low acute toxicity but may cause irritation upon contact with skin, eyes, or respiratory tract. Prolonged exposure to high doses has been linked to oxidative stress in cells. Proper handling requires gloves, goggles, and ventilation. Storage should be in airtight containers under inert gas to prevent oxidation. In feed applications, adherence to recommended dosages is essential to avoid toxicity. The compound is classified as hazardous in some jurisdictions, requiring Material Safety Data Sheet (MSDS) compliance during transport and handling. Disposal must follow local environmental regulations due to its persistence.
B2B Procurement Guide
When sourcing menadione, prioritize suppliers with ISO or GMP certifications to ensure product consistency and traceability. Key specifications include purity (≥98%), heavy metal limits (e.g., <10 ppm lead), and residual solvent testing. Bulk buyers should request certificates of analysis (CoA) for each batch. Prices fluctuate based on market demand and raw material costs. For large-scale feed producers, long-term contracts with volume discounts are advisable. Logistics should account for its classification as a moisture-sensitive chemical, requiring climate-controlled shipping for international orders.
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