A method for producing 2,3-butanediol with microalgae as raw material
A technology of butanediol and microalgae, applied in microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of low amount of hydrolyzed sugar, high cost and low content of 2,3-butanediol, etc. Achieve high starch content, increase fermentable sugar content, and save energy and energy
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Embodiment 1
[0037] Preparation of microalgae seed solution: Chlorella ( Chlorella vulgaris ) seeds were inserted into BG11 microalgae culture medium, at a temperature of 30°C, an air flow of 0.25vvm, CO 2 The content is 1v%, the stirring speed is 100rpm, the pH is 7.0, and the light-dark ratio is 10:14, and it is cultivated to the logarithmic growth phase.
[0038] (1) Microalgae cultivation: insert the microalgae seed liquid into the microalgae medium rich in N element according to the inoculation amount of 5v%, and the enrichment of N element means adding NaNO to the medium at 2.5g / L 3 , cultivate until the logarithmic growth phase stops; discharge the supernatant after standing and settling, add a medium containing trace N elements to continue culturing, NaNO 3 0.05 g / L, and 30 mmol / L 3-phosphoglycerate and 50 μmol / L pine needle oil were added to the culture medium. The above-mentioned microalgae cultivation is carried out at a temperature of 30°C, an aeration rate of 0.25vvm, CO 2...
Embodiment 2
[0045] The treatment process and operating conditions were the same as those in Example 1, except that in step (1), 30 mmol / L 3-phosphoglycerate and 50 μmol / L dipropen were added to the medium at the same time. The microalgae are cultivated to the stable stage, and the algae liquid is harvested, in which the starch content reaches more than 50%. After hydrolysis treatment, the sugar concentration in the hydrolyzate is about 80g / L. After 48 hours of fermentation, the sum of the final concentrations of 2,3-butanediol and acetoin in the fermentation broth was 75.23g / L.
Embodiment 3
[0047] The treatment process and operating conditions were the same as those in Example 1, except that in step (1) 30 mmol / L 3-phosphoglycerate and 50 μmol / L benzotrione were added to the culture medium at the same time. The microalgae are cultivated to the stable stage, and the algae fluid is harvested, in which the starch content reaches more than 50%. After hydrolysis treatment, the sugar concentration in the hydrolyzate is about 80g / L. After 48 hours of fermentation, the sum of the final concentrations of 2,3-butanediol and acetoin in the fermentation broth was 75.78 g / L.
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