Method for producing 1,3-propylene glycol through ferment in high cell density by using bacteria in intestinal tract
A technology of Klebsiella and propylene glycol, applied in the field 1, can solve the problems of affecting the metabolic reaction rate, slow growth of bacteria, shortening the production cycle, etc., and achieve the effect of simple and economical process, short process cycle, and shortened fermentation cycle
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Embodiment 1
[0040] Bacterial species: Klebsiella pneumoniae (Klebsiella pneumoniae) seed culture solution (mass concentration, g / L): glycerol 10, glucose 10, K 2 HPO 4 ·3H 2 O, 3.4, NH 4 Cl2.0, yeast extract 3.0, MgSO 4 ·7H 2 O 0.2, CaCO 3 2.0, iron solution 1mL / L, trace element solution 2mL / L.
[0041] Fermentation medium (mass concentration, g / L): glycerol 2.0, K 2 HPO 4 ·3H 2 O 1.36, NH 4 Cl 5.4, yeast extract 1.0, MgSO 4 ·7H 2 O 0.2, CaCl 2 2.0 iron solution 1mL / L, trace element solution 2mL / L, V B12 Solution 1mL / L, cobalt solution 1mL / L. Trace elements containing: CuCl 2 , H 3 BO 3 , MnCl 2 , Na 2 MoO 4 , NiCl 2 , ZnSO4, the content of trace elements is about 0.01~50mg / L.
[0042] Seed liquid culture process: After 24 hours of activation of the slant bacteria, inoculate into a 500mL Erlenmeyer flask filled with 150mL sterile seed culture liquid, and carry out aerobic seed culture on a shaker at 37°C and 180r / min until the cell density reaches OD 650 ≥4.0
[0...
Embodiment 2
[0050] Using the same seeds and fermentation medium, and the same nutrient matrix fed-batch process, in the late stage of batch fermentation, the methods of reducing ventilation, maintaining pressure, and nitrogen gas were adopted respectively. The obtained results are as follows:
[0051] The influence of table 2 aeration control on fermentation result
[0052] Cell density
Spend
OD 650
fermentation
cycle
Glycerin
residual
1,3-Propane
alcohol concentration
Moore turns
conversion rate
specific production rate
reduce pass
capacity
7.4
27hr
<0.1%
47g / L
58.3%
1.74g / (L·h)
Upper holding pressure
6.8
31hr
<0.1%
48g / L
59.6%
1.55g / (L·h)
Nitrogen
6.8
29hr
<0.1%
51g / L
63.3%
1.76g / (L·h)
[0053] It can be concluded that nutrient-limited feeding and oxygen segmental regula...
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