METHOD FOR EXTRACTING AVERMECTIN B2 FROM AVERMECTIN OINTMENT

摘要

A method for extracting avermectin B2 from an avermectin ointment comprises: dissolving an avermectin ointment into a crystallizing solvent, separating crystals out by cooling, and performing vacuum filtrating, thus obtaining an avermectin B2 crude product; and dissolving the avermectin B2 crude product into the crystallizing solvent, adding activated carbon for decoloration, and filtrating and drying after recrystallizing, thus obtaining an avermectin B2 fine product. The technology adopts cheap activated carbon and a common organic solvent for separating and purifying an avermectin B2 component from avermectin ointment, the technology is simple, the operation is convenient, crystallizing frequency is reduced, and a high-purity avermectin B2 product can be obtained.