Fecha de publicación: 28/01/2022 Fuente: Wipo "olive oil" The invention provides a fermentation culture medium for reducing impurities in fermentation production of S-ABA. The fermentation culture medium is characterized in that the fermentation culture medium adopted in an S-ABA fermentation process comprises the following effective components: a nitrogen source which is one or more of soybean meal, soybean protein powder and corn protein powder, a carbon source which is one or more of dextrin, glucose, starch, cyclodextrin, glycerol and the like, inorganic salts including sulfate and phosphate, and oil which is one or more of rapeseed oil, soybean oil, corn germ oil, olive oil and salad oil, wherein sulfate ferrous sulfate heptahydrate in the culture medium is a carbon source and a nitrogen source, and the mass of inorganic salt is 0.5-1%. By controlling the content of ferrous sulfate in the fermentation culture medium, the content of impurities in the fermentation liquid can be effectively controlled. Compared with the content of ferrous sulfate in an original fermentation culture medium formula, the content is increased by 10 times, and impurities are reduced by 50%.