Method for preparing hydrocortisone by resting cell multi-round fermentation
A technology for converting hydrocortisone and resting cells, which is applied in the field of microbial steroid pharmacy and medical engineering, can solve the problems of poor specificity of 11β-hydroxylase, limited HC yield, low feeding concentration, etc., to save bacteria The effect of cultivating steps, shortening the cycle, improving conversion rate and specific productivity
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Embodiment 1
[0037] A method for preparing hydrocortisone by multi-round fermentation of resting cells, the steps are as follows:
[0038] Strain preparation: inoculate the blue columbine mold on the PDA solid slant medium under sterile conditions, control the culture temperature at 28±0.5°C, and cultivate for 7-9 days until the gray spore filaments that fill the test tube grow and grow. spore.
[0039] Fermentation culture: the spores of the above strains are eluted with a certain amount of sterile water under sterile conditions, inoculated into the shake flask medium, and cultivated at a temperature of 28±0.5°C and a rotational speed of 200r / min until the pH is 4.0 , and the culture period was 24h, and the fermented bacterial liquid of Absidia indigo was obtained.
[0040] The shake flask culture medium (by percentage) is: glucose 1.2%, corn steep liquor 1%, yeast extract 0.4%, ammonium sulfate 0.6%, the rest is water, pH=6.3, sterilized at 121° C. for 30 minutes.
[0041] Substrate fe...
Embodiment 2
[0044] A method for preparing hydrocortisone by multi-round fermentation of resting cells, the steps are as follows:
[0045] (1) Strain preparation: Inoculate the blue columbine mold on the PDA solid slant medium under aseptic conditions, control the culture temperature at 28±0.5°C, and cultivate for 7 to 9 days until it grows into a tube full of bacteria. Gray spores and spores.
[0046] (2) Fermentation culture: Then, the spores of the above strains are eluted with a certain amount of sterile water under sterile conditions, inoculated into the shake flask culture medium, and cultivated at a temperature of 28±0.5°C and a rotational speed of 200r / min. Until the pH is 4.0, the culture period is 24 hours, and the fermented bacterial liquid of Absidia indigo can be obtained.
[0047] The shake flask culture medium (by percentage) is: glucose 1.2%, corn steep liquor 1%, yeast extract 0.4%, ammonium sulfate 0.6%, the rest is water, pH=6.2, sterilized at 121° C. for 30 minutes.
...
Embodiment 3
[0051] A method for preparing hydrocortisone by multi-round fermentation of resting cells, the steps are as follows:
[0052] (1) Strain preparation: Inoculate the blue columbine mold on the PDA solid slant medium under aseptic conditions, control the culture temperature at 28±0.5°C, and cultivate for 7 to 9 days until it grows into a tube full of bacteria. Gray spores and spores.
[0053] (2) Fermentation culture: Then, the spores of the above strains are eluted with a certain amount of sterile water under sterile conditions, inoculated into the shake flask culture medium, and cultivated at a temperature of 28±0.5°C and a rotational speed of 200r / min. Until the pH is 4.0, the culture period is 24 hours, and the fermented bacterial liquid of Absidia indigo can be obtained.
[0054] The shake flask culture medium (by percentage) is: glucose 1.2%, corn steep liquor 1%, yeast extract 0.4%, ammonium sulfate 0.6%, the rest is water, pH=6.4, sterilized at 121° C. for 30 minutes.
...
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