Overview
Monensin is a naturally occurring polyether antibiotic derived from Streptomyces cinnamonensis. First isolated in 1967, it is classified as an ionophore, facilitating the transport of ions across biological membranes. Its primary use is in veterinary medicine, where it serves as a feed additive for ruminants and poultry to improve feed efficiency and prevent coccidiosis. As a sodium-selective ionophore, monensin alters microbial populations in the rumen, promoting propionate production while reducing methane emissions. This mechanism enhances energy utilization in livestock, making it a cost-effective tool for large-scale animal production. Regulatory approvals vary by region, with strict guidelines on dosage to prevent toxicity.
Physical and Chemical Properties
Monensin appears as a white to off-white crystalline powder with a molecular weight of 670.87 g/mol. It decomposes at 103-105°C and is highly soluble in organic solvents like ethanol and chloroform but only slightly soluble in water. The compound is stable under dry conditions but degrades in acidic or alkaline environments. Its polyether structure enables it to form complexes with monovalent cations, particularly sodium and potassium. This property underpins its biological activity, disrupting ion gradients in susceptible microorganisms. Commercial formulations often use monensin sodium salt (CAS 22373-78-0) for improved stability and solubility in feed applications.
Main Applications
In cattle farming, monensin is primarily used to boost weight gain and feed conversion efficiency. Typical inclusion rates range from 5-30 ppm in feed, depending on regional regulations. It shifts rumen fermentation toward propionate, reducing energy loss as methane and heat. For poultry, monensin (at 90-110 ppm) controls Eimeria spp., the causative agents of coccidiosis. It is often combined with other anticoccidials in rotation programs to prevent resistance. Off-label uses include equine protozoal myeloencephalitis treatment, though extreme caution is required due to horses' high sensitivity.
Safety and Storage
Monensin exhibits low toxicity to target animals at recommended doses but can be fatal to horses, dogs, and other monogastrics. Workers handling the powder should use NIOSH-approved respirators, gloves, and eye protection to avoid inhalation or skin irritation. Storage requires protection from light and moisture in sealed containers at temperatures below 25°C. Bulk purchases should be used within two years to maintain potency. Spills must be contained with inert absorbents and disposed of as hazardous waste in accordance with local regulations.
B2B Procurement Guide
B2B buyers should prioritize suppliers with certifications like GMP or ISO 9001 to ensure consistent quality. Key specifications include purity (≥90%), residual solvent levels, and microbiological contamination limits. Batch-specific COAs (Certificates of Analysis) are essential. Logistics planning should account for monensin's classification as a hazardous material (UN3077) during transportation. For international shipments, verify compliance with destination-country veterinary drug regulations, such as FDA 21 CFR 558 in the U.S. or EU Regulation 1831/2003. Volume discounts typically apply for orders exceeding 100 kg.
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