The present invention belongs to the field of
biotechnology and discloses a method for green and high-yield production of
diosgenin using microorganisms. Specifically, after homogenizing
Dioscorea zingiberensis, it is treated with
bacterial strain A to release saponins, and then treated with double enzymes to saccharify
starch. The filtrate and
filter cake are obtained by plate and frame
filtration. The
filter cake is mixed with water and filtered again, and the filtrates are combined to obtain a
Dioscorea zingiberensis
sugar solution containing saponins. If the
raw material is dry
Dioscorea zingiberensis, a complex
enzyme is added to the filtrate for treatment, and
Dioscorea zingiberensis sugar solution and a
saponin-containing precipitate are obtained by
centrifugation. If the
raw material is fresh ginger, the filtrate is subjected to membrane separation to obtain
Dioscorea zingiberensis sugar solution and a
saponin concentrate, and the supernatant
saponin solution and a saponin-containing precipitate are obtained by
centrifugation. The saponin-containing precipitate is extracted with
ethanol to obtain a saponin extract. A culture medium is prepared with the supernatant saponin solution and the saponin extract, and treated with
bacterial strain B, and a
diosgenin-containing precipitate is obtained by
centrifugation. The precipitate is dried and refined by
solvent extraction to obtain a
diosgenin product. The present invention improves the design of the overall process flow, can obtain two types of saponins, has a high saponin extraction rate, and greatly improves the diosgenin yield, which is 1.3 to 1.6 times that of the
acid hydrolysis process.