Method for producing recombinant human interferon beta 1b protein through large-scale fermentation
A recombinant human interferon and a fermentor technology, which is applied in the field of large-scale fermentation production of recombinant human interferon beta 1b protein, can solve the problems of inability to use beta interferon for industrialized production, low yield of fermentation products, etc., and achieves improved bacterial harvest. The effect of improving fermentation yield and high-efficiency expression
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Embodiment 1
[0018] 1. Prepare 300L 2YT medium in a 500L fermenter, sterilize at 121°C and cool down to 35°C.
[0019] 2. Inoculate 15L of mature recombinant Escherichia coli seed solution for cultivation. During the entire fermentation and cultivation stage, the temperature is maintained at 35±1°C, the rotation speed is 200r / min, the ventilation rate is 200L / min, and the pH is 5.0.
[0020] 3. During the fermentation and cultivation process, take samples regularly to measure the OD600 value of the cell density of the bacterial liquid; cultivate until the OD600 of the cell density reaches 2, and then add isopropylthiogalactopyranoside (IPTG) to a final concentration of 0.2mM for induction.
[0021] 4. Start feeding after induction, and the feeding medium is also 2YT medium. Feeding rate Feed-feeding was carried out at a rate of 5% of the original medium volume per hour. Continue to cultivate for 4 hours and the fermentation ends.
[0022] 5. Sampling was used to determine the expression ...
Embodiment 2
[0024] 1. Prepare 300L 2YT medium in a 500L fermenter, sterilize at 121°C and cool down to 37°C.
[0025] 2. Inoculate 30L of mature recombinant Escherichia coli seed solution for cultivation. During the entire fermentation and cultivation stage, the temperature is maintained at 37±1°C, the rotation speed is 300r / min, the ventilation rate is 300L / min, and the pH is 8.0.
[0026] 3. During the fermentation and cultivation process, take samples regularly to measure the OD600 value of the cell density of the bacterial liquid; cultivate until the OD600 of the cell density reaches 8, and then add isopropylthiogalactopyranoside (IPTG) to a final concentration of 0.8mM for induction.
[0027] 4. Start feeding after induction, and the feeding medium is also 2YT medium. Feeding rate Feed-feeding was carried out at a rate of 10% of the original medium volume per hour. Continue to cultivate for 2 hours and the fermentation ends.
[0028] 5. Sampling was used to determine the expression...
Embodiment 3
[0030] 1. Prepare 300L 2YT medium in a 500L fermenter, sterilize at 121°C and cool down to 40°C;
[0031] 2. Inoculate 45L of mature recombinant Escherichia coli seed solution for cultivation, and maintain the temperature at 40±1°C, rotating speed at 500r / min, ventilation rate at 500L / min, and pH at 7.0 during the entire fermentation period;
[0032] 3. During the fermentation and cultivation process, take samples regularly to measure the OD600 value of the cell density of the bacterial liquid; cultivate until the cell density OD600 reaches 5, and then add isopropylthiogalactopyranoside (IPTG) to a final concentration of 1.5mM for induction.
[0033] 4. Start feeding after induction, and the feeding medium is also 2YT medium. The feeding rate was fed by feeding at a rate of 1% of the original medium volume per hour. Continue to cultivate for 8 hours and the fermentation ends.
[0034] 5. Sampling was used to determine the expression level of the bacteria by SDS-PAGE electrop...
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