Method for producing high-yield gamma-propalanine and application thereof
A high-yield technology of aminobutyric acid, which is applied in the fields of medical biology and food engineering, and can solve problems such as hidden safety and sanitation
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Embodiment 1
[0059] (1) Screening of starting strains: From more than 40 samples of sauerkraut (soup) naturally pickled in northern my country, the double-layer plate method was used, that is, containing 5% calcium carbonate and GABA, cultured at 30°C for 48 hours, and selected. The colonies in the transparent circle were fermented and the GABA content was detected by high-performance liquid chromatography. Five strains of GABA-producing strains were obtained, and one strain of Lactobacillus with a yield of 1.4g / L was screened out, numbered S1, and transferred to an inclined plane and stored in a refrigerator at 4°C. .
[0060] (2) Ultraviolet-acridine orange mutagenesis: Take the well-grown Lactobacillus brevis S1 seed solution, irradiate with ultraviolet light for 90s, and then transfer 600 μL of the ultraviolet-mutated bacterial suspension into a test tube containing 5 mL of mutagenic medium Incubate in a dark water bath for 12 hours at 30°C with shaking. (The mutagenesis medium contains...
Embodiment 2
[0070] A kind of high-yielding Lactobacillus brevis Lactobacillus brevis The new process flow diagram of CGMCCNO.3414 production of γ-aminobutyric acid is shown in the attachment figure 1 .
[0071] will activate the Lactobacillus brevis CGM CCN 0 The .3414 strain was inoculated in the seed medium for cultivation, and was transferred to the fermentation medium when the bacterial mass reached the fermentation conditions.
[0072] Seed medium (g / L) and cultivation method: corn saccharification solution 20, peptone 10, yeast extract powder 5, ammonium citrate 2, magnesium sulfate 0.58, manganese sulfate 0.25, sodium acetate 2, potassium dihydrogen phosphate 2. Seed culture conditions: 30 ° C incubator, static culture for 12 hours. According to the inoculation amount of 10-15%, it is inserted into a 5L fermenter.
[0073] Fermentation medium (g / L) and culture method: corn saccharification liquid 20, yeast extract powder 20, corn steep liquor 10, sodium acetate 2, potassiu...
Embodiment 3
[0078] will activate Lactobacillus brevis CGM CCN 0 .3414 strain was inoculated in the seed medium, and cultured statically at 30°C for 10-12 hours.
[0079] Seed medium composition (g / L): peptone 10, yeast extract 10, glucose 20, sodium acetate 5, ammonium citrate 2, MnSO 4˙ h 2 O 0.05, MgSO 4˙ 7H 2 0 0.2, Tween 80 1mL, distilled water 1000 mL, pH control 5.0-6.0. Transfer to the fermentation medium containing 8% L-sodium glutamate at an inoculum size of 10-15%.
[0080] Fermentation medium (g / L): corn steep liquor 10, glucose 22, yeast powder 15, sodium acetate 2, magnesium sulfate 0.2, (NH 4 ) 2 SO 4 0.2, pH6.0. After 16 hours of cultivation, the growth of the bacteria entered the logarithmic phase, and the pH was adjusted to 4.6 and kept at 4.6. After 60 hours of cultivation, the GABA production reached a maximum of 76.52g / L. After culturing the cells for 60 h, the cells were collected, centrifuged for 10 min, 8000 rpm, 4 °C, washed twice with 0.2 mM sodium phos...
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