Method for extracting alpha-ketoglutarate and pyruvate simultaneously from microbial fermentation broth or enzymatic conversion solution

Abstract

The present disclosure provides a method for extracting alpha-ketoglutarate and pyruvate simultaneously from microbial fermentation broth or enzyme transformation solution, which is related to the technical field of biological separation and extraction. The method comprises the following steps: centrifuging the microbial fermentation broth or enzymatic conversion solution containing α-KG and PA to remove the cells and other visible solids; removing the macromolecular impurities by ultrafiltration; evaporating and concentrating under reduced pressure conditions; extracting with the water-insoluble extraction after acidification; separating crude crystals of α-KG and crude liquid of PA by evaporation crystallization method (if concentration of PA is great higher than that of α-KG, crystallization separation should be conducted after distilling partial pure pyruvate); washing the crude crystal of α-KG with water-insoluble organic solvent as ethyl acetate or butyl acetate, drying and crushing to obtain qualified α-KG; distilling to gain qualified PA product applying high vacuum distillation (or molecular distillation).