Fermentation process for increasing yield of L-arginine
A technology of arginine and technology, applied in the field of bioengineering, can solve the problems of unsatisfactory production level and output, low acid production level, high cost, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0053] A kind of processing step of improving L-arginine fermentation acid production is as follows:
[0054] Strain selection:
[0055] From Brevibacterium flavum ATCC21493 (SD R ) as the starting bacteria, add a certain concentration of AHV (α-amino-β-hydroxyvaleric acid) or 2-TA (α-thiazolealanine) to the selective medium to induce TA174 (SD R 、AHV R 、Z-TA R ) strains;
[0056] TA188 (SD R 、AHV R , 2-TA R , L-His - ) strains;
[0057] After TA188 was treated with NTG, the mutant strain TA189 (SD R 、AHV R , 2-TA R , L-His - ) strains.
[0058] As preferably, the screening of the Brevibacterium flavum TA174:
[0059] Starting strain: Brevibacterium flavum ATCC214939 (SD R )
[0060] Described strain, the composition of the mutagenesis medium used for screening is:
[0061] culture medium
[0062] a. Complete medium: peptone 1.0%, beef extract 1.0%, yeast extract 0.5%, sodium chloride 0.5%, agar powder 2.0%, PH7.0-7.2 (test paper), sterilization temperature 1...
Embodiment 2
[0100] Screening of Brevibacterium flavum TA188 Mutant Strain and Fermentation in 30L Tank
[0101] (1), materials and methods
[0102] ①, starting strain Brevibacterium flavum AT174 (SD R 、AHV R , 2-TA R )
[0103] ②. Medium The selective medium is supplemented with 0.01% each of L-histidine (L-His), L-proline (L-Pro) and methionine (Met) on the basis of the basic medium.
[0104] ③. Mutagenesis method and selection of resistant bacteria
[0105] Centrifuge the value-added solution of the complete medium, wash the bacteria twice with 1 / 30M phosphate buffer and prepare a single-cell bacterial suspension, which is properly diluted and spread on a selective medium plate for 2-3 days at 30°C. The colonies that do not grow on the medium plate but grow on the selective plate may be L-His-deficient (L-His - ) or L-Pro deficiency (L-Pro - ) or Met-deficient (Met - ), and then confirmed by growth spectrum method.
[0106] Results and discussion
[0107] 1. The characteris...
example 1
[0116] Example 1. The initial volume (after planting) is 12L, the seed volume is 10%, the initial sugar is 12.5% (1.5 kg of oral sugar), and the sugar supplement (1.8 kg of oral sugar) is made into about 3 L of 60% sugar solution, which contains C.S.L 60g acidic component After digestion, mix with sugar supplement.
[0117] Sugar supplement method: artificial intermittent or automatic pulse. Fermentation medium ammonium initial sulfide 4%, 18 h OD (1 / 100) is 0.47, when the wet bacteria body is 0.72g / 10ml, the pH is positioned at 6.6; take industrial glutenic acid (containing about 95%) and add water to adjust the pH to about 6.0 with ammonia water Dissolve and add 4 times after sterilization, 1% (120g) each time, 18 hours for the first time, and then add the second time when the residual L-GA is lower than 0.5% as measured by the Warburg respiration instrument.
[0118]
[0119] time (h) pH OD (1 / 100) Wet bacteria (g / 10ml) R.G (%) L-arg (%) 0 6.8 ...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com