Method for precipitating natural avermectins

C - Chemistry – Metallurgy – 12 – P

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C12P 19/62 (2006.01) C07H 1/08 (2006.01) C07H 19/01 (2006.01)

Patent

CA 2167186

A process for separating a natural B avermectin from a natural avermectin containing fermentation broth by using an aqueous precipitation. The process comprises extracting natural avermectins from the fermentation broth with a water miscible solvent and adding sufficient water to precipitate the natural B avermectins. Preferably, the water miscible solvent is a C1-C3 alcohol, acetone, or acetonitrile. In addition, an acid, base, salt or surfactant may be added to facilitate the precipitation. This invention provides an isolation technique that substitutes the use of an aqueous precipitation for nonaqueous solvent precipitations. The reduction in use of nonaqueous solvents provides economic, environmental and safety benefits.

Méthode pour séparer les avermectines B naturelles d'un bouillon de fermentation renfermant des avermectines naturelles, par précipitation aqueuse. La méthode consiste à extraire les avermectines naturelles à partir du bouillon de fermentation à l'aide d'un solvant miscible à l'eau, et à ajouter suffisamment d'eau pour précipiter les avermectines B naturelles. Le solvant miscible à l'eau est de préférence un alcool C1-C3, de l'acétone ou de l'acétonitrile. De plus, on peut ajouter un acide, une base, un sel ou un tensioactif pour faciliter la précipitation. Cette invention donne une technique d'isolation permettant de remplacer la précipitation avec un solvant non aqueux par la précipitation en milieu aqueux. L'utilisation moindre de solvants non aqueux représente des avantages du point de vue du coût, de l'environnement et de la sécurité.

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