Process for making avermectin/zein compositions
First Claim
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1. A solvent-depleted avermectin/zein composition useful for treating plants or animals infected with parasites which comprises avermectin or a pharmaceutically acceptable salt thereof and zein in suspension with a ratio from about 1 to 1 to about 100 to 1 of zein to avermectin and an inert ingredient.
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Abstract
Their is disclosed a novel solvent-depletion process for making an avermectin/zein composition and the composition itself, which has excellent photostability and unexpected bioavailability to foliar-feeding insects. The process consists of depleting a dilute acidic, basic or alcoholic solvent from an emulsified solution of avermectin, zein, and dilute solvent.
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13 Claims
- 1. A solvent-depleted avermectin/zein composition useful for treating plants or animals infected with parasites which comprises avermectin or a pharmaceutically acceptable salt thereof and zein in suspension with a ratio from about 1 to 1 to about 100 to 1 of zein to avermectin and an inert ingredient.
- 4. A solvent-depletion process for making avermectin/zein compositions which comprises contacting avermectin or a pharmaceutically acceptable salt thereof and zein with a dilute acidic, basic, or alcoholic solvent, emulsifying the avermectin/zein/solvent solution in a mineral oil with an emulsifier to form a dispersed phase consisting of the avermectin/zein and solvent and a continuous phase consisting of the mineral oil and emulsifier, saturating the continuous phase with the solvent before or during emulsification, pumping and recycling the resulting emulsion through a semi-permeable membrane which retains the dispersed phase and releases the solvent-saturated continous phase as permeate and adding additional continuous phase which is not saturated with solvent, resulting in depletion of the solvent from the dispersed phase, thereby making the avermectin/zein composition suspended in the mineral oil solution.
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12. A solvent-depletion process for making avermectin/zein compositions which comprises contacting avermectin and zein with acetic acid, emulsifying the avermectin/zein/acetic acid solution in a mineral oil with a specific gravity of about 0.83 to about 0.88 at 25°
- C. and fractionated lecithin to form a dispersed phase consisting of the avermectin/zein and acetic acid and a continuous phase consisting of the mineral oil and fractionated lecithin, saturating the continuous phase with acetic acid before or during emulsification, pumping and recycling the resulting emulsion through a semi-permeable membrane which retains the dispersed phase and releases the solvent-saturated continous phase as permeate and which has a pore size of about 0.1 to about 0.8 microns, and adding additional continuous phase which is not saturated with acetic acid, resulting in depletion of the acetic acid from the dispersed phase, thereby making the avermectin/zein composition suspended in a mineral oil solution.
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Specification