FIELD: microbiology, oncology. SUBSTANCE: method involves the cultivation of bacterium Bacillus thuringiensis, dissolving of acting substance, its repeated precipitation and drying. Active substance is dissolved in alkali being dissolving is carried out directly from spore-crystalline complex in bacterial biomass composition; precipitate is removed, active substance is precipitated with concentrated acetic acid. Solvents: sodium or potassium hydroxide at the ratio of volumes (1:10)-(1:15). EFFECT: simplified method, increased economy and activity of the end product.
