Hydroxy alkanoic acid polymer and its producing method
A technology of hydroxyalkanoic acid and production method, which can be applied to bacteria, fermentation and other directions, can solve the problems of PHA increasing the difficulty of product extraction, high price, and not using recombinant bacteria.
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example 1
[0072] Example 1 Fermentative production of P (HBHO) synthesized with glucose as carbon source
[0073] (1) Inclined plane and shake flask seed culture
[0074] Inoculate the preserved S. fredii strain on the slant medium, activate it twice in an incubator at 30°C, transfer it to a shake flask containing a shake flask seed medium, and activate it twice again, and wait for the next stage of shaking Flask cultured for 14 hours, when the bacterial cell concentration reached 1.53g stem cells / L (OD 600 When the value is 3.0), the cell growth is still in the logarithmic growth phase, which is used as the seed liquid of the seed tank for subsequent use.
[0075] (2) Seed tank seed culture
[0076] Take a 10L self-control tank as the seed tank, use fermented seed culture medium, the filling coefficient is 0.7, insert the seed solution, the inoculum amount is 8%, cultivate at 30°C, adjust and control the pH to 7.0-7.2 through 8mol NaOH solution, and keep the solution When the oxygen...
Embodiment 2
[0084] Example 2 Fermentative production of P(HBHO) synthesized by using starch hydrolyzate as carbon source
[0085] (1) Inclined plane and shake flask seed culture
[0086] Inoculate the preserved Sfredii strain on the slant medium, activate it twice in the incubator at 28°C, transfer it to the shake flask containing the shake flask seed medium, and activate it twice again, and cultivate it in the next stage of shake flask 16h, when the bacterial cell concentration reached 2.3g stem cells / L (OD 600 When the value is 4.5), the cell growth is still in the logarithmic growth phase, and it is used as the seed liquid of the seed tank for subsequent use.
[0087] (2) Seed tank seed culture
[0088] A 10L self-control tank is used as the seed tank, a fermented seed medium is used, the filling coefficient is 0.7, the seed solution is inserted, the inoculation amount is 8%, and the culture is carried out at 28°C, and the pH is adjusted and controlled by 8 mol of NaOH solution to ma...
Embodiment 3
[0094] Embodiment 3, use waste molasses as the fermentative production of carbon source synthesis P (HBHO)
[0095] (1) Inclined plane and shake flask seed culture
[0096] Inoculate the preserved S. fredii strain on the slant medium, activate it twice in an incubator at 32°C, transfer it to a shake flask containing a shake flask seed medium, and activate it twice again, and wait for the next stage of shaking Flask cultured for 18h, when the bacterial cell concentration reached 2.85g stem cells / L (OD 600 When the value is 5.5), the cell growth is still in the logarithmic growth phase, and it is used as the seed liquid of the seed tank for subsequent use.
[0097] (2) Seed tank seed culture
[0098] Use a 10L self-control tank as the seed tank, use a fermented seed medium with a loading coefficient of 0.7, insert the seed liquid, and inoculate the amount of 10%, cultivate at 32°C, adjust and control the pH to 7.0-7.2 through 8mol NaOH solution, and maintain the solution. Whe...
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