Overview
Eprinomectin is a semi-synthetic derivative of avermectin, developed specifically for veterinary use. It belongs to the macrocyclic lactone class of compounds and exhibits potent activity against a wide range of nematodes and arthropods. Unlike some related compounds, eprinomectin is notable for its low milk partitioning, making it particularly valuable for dairy cattle treatments where milk withdrawal periods are a concern. First introduced in the 1990s, eprinomectin has become a cornerstone of parasite control programs in livestock production. Its unique chemical structure provides enhanced pharmacokinetic properties compared to earlier avermectins, allowing for effective parasite control with lower dosage requirements and reduced environmental impact.
Physical and Chemical Properties
Eprinomectin appears as a white to off-white crystalline powder with limited water solubility but good solubility in most organic solvents. The compound is relatively stable under normal storage conditions but may degrade when exposed to strong acids, bases, or prolonged UV light. Its molecular structure features a 16-membered macrocyclic ring with both hydrophilic and lipophilic regions, contributing to its broad-spectrum activity. Thermal analysis shows decomposition beginning around 150°C rather than a distinct melting point. The compound's partition coefficient (log P) of approximately 4.5 indicates high lipid solubility, which influences its distribution in animal tissues and persistence against target parasites. These physicochemical characteristics are carefully balanced to optimize both efficacy and safety profiles.
Main Applications
In veterinary practice, eprinomectin is primarily formulated as pour-on solutions, injectables, or topical preparations for cattle, sheep, and other livestock. It effectively controls gastrointestinal roundworms, lungworms, mites, lice, and various myiasis-causing flies. A key advantage is its zero milk withdrawal period when used as labeled in dairy cattle, unlike other avermectins that require milk discard periods. The pharmaceutical industry also explores eprinomectin for companion animal formulations, particularly in long-acting parasite control products for dogs and cats. Some agricultural applications include its use in controlled-release devices for pasture animals, providing season-long parasite protection. Recent research investigates potential applications in aquaculture and against certain ectoparasites affecting wildlife populations.
Safety and Storage
Proper handling of eprinomectin requires standard laboratory precautions including gloves, protective eyewear, and adequate ventilation. While it has low acute toxicity to mammals, chronic exposure should be avoided. The compound is highly toxic to aquatic invertebrates and bees, necessitating careful environmental management during use and disposal. For long-term stability, eprinomectin should be stored in tightly sealed containers under refrigeration (2-8°C) with protection from light. Bulk quantities are typically supplied in foil-lined bags or amber glass containers. Formulators must consider the compound's sensitivity to oxidation when developing commercial products, often incorporating antioxidants in final preparations to extend shelf life.
B2B Procurement Guide
When sourcing eprinomectin, buyers should prioritize suppliers with certified Good Manufacturing Practice (GMP) compliance and verifiable analytical documentation. Key specifications to verify include purity (typically ≥90% for technical grade), residual solvent levels, and microbiological limits. Purchase contracts should clearly define acceptable impurity profiles and stability guarantees. Large-volume buyers may benefit from contractual agreements that include batch testing and quality audits. For international shipments, ensure proper classification under HS codes 2932.29 or 2941.90, and confirm all required import permits for veterinary active ingredients. Current market conditions show stable supply, but lead times can extend to 6-8 weeks for custom synthesis orders during peak demand periods.
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