190 results about "Fed-batch culture" patented technology

The invention relates to methods of improving protein production, e.g., large-scale commercial protein production, e.g., antibody production, utilizing a modified fed-batch cell culture method comprising a cell growth phase and a polypeptide production phase. The modified fed-batch cell culture method combines both cell culture perfusion and fed-batch methods to achieve higher titers of polypeptide products. Because the modified fed-batch cell culture method of the invention produces higher polypeptide product titers than fed-batch culture alone, it will substantially improve commercial-scale protein production. The invention also relates to a perfusion bioreactor apparatus comprising a fresh medium reservoir connected to a bioreactor by a feed pump, a recirculation loop connected to the bioreactor, wherein the recirculation loop comprises a filtration device, e.g., ultrafiltration or microfiltration, and a permeate pump connecting the filtration device to a permeate collection container.

The present invention relates to fed batch culture methods for high cell density growth of Listeria which produce cultures having an OD₆₀₀ greater than about 2.2 or higher. In particular, the invention provides methods for high cell density growth of Listeria comprising growth in a pH controlled bioreactor and, optionally, the gradual addition of a carbon source, e.g., glucose, with or without one or more additional nutrients, e.g., vitamins, when growth in the initial culture is nearly complete or complete. In one embodiment, the methods of the invention are used to produce Listeria-based compositions, e.g., vaccines comprising Listeria that express a tumor-associated antigen, e.g., an EphA2 antigenic peptide, for eliciting an immune response against hyperproliferative cells.

The invention provides a preparation method of 3'-sialic acid lactose, belonging to the technical field of biological engineering. The preparation method comprises the following steps of: taking colibacillus CCTCC (colibacillus China center for type culture collection) NO: M208088 as a starting strain, adding a fermentation medium into a fermentation tank, fermenting for 2-6h, then adding a fed batch culture medium, and adding lactose in a flowing way at the mid-later period of the fermentation; and centrifuging the fermentation liquid to obtain liquid supernatant 1 and a thallus, diluting the centrifuged thallus by adding water and splitting in a heating way, recentrifuging to obtain liquid supernatant 2, merging the liquid supernatant 1 and the liquid supernatant 2, and absorbing, desorbing and vacuum drying by ion exchange resin to obtain the 3'-sialic acid lactose. A mass of the 3'-sialic acid lactose can be prepared by the CCTCC NO: M208088. The 3'-sialic acid lactose can change the current situation that the sialyloligosaccharide component is less in exogenous adding substances in conventional baby milk, and can provide the guarantee to add more efficient sialic acid trophic factors into the baby milk.

The invention discloses an FQ15 enterococcus faecalis and a method of a feed additive which uses the bacteria production for promoting the growth: an MRS culture medium is taken as a seed culture medium, and the FQ15 enterococcus faecalis is cultured under the aerobic or facultative condition at 30 to 45 DEG C for 4 to 24 hours, so as to become a grade one seed; the grade one seed liquid is inoculated in a seed tank for amplification culture, the MRS culture medium is adopted as the seed culture medium, and the culture is carried out for 4 to 24 hours under the aerobic or the facultative condition at 30 to 45 DEG C to become a grade two seed; the grade two seed liquid is inoculated in a fermentation tank for fermentation culture, an improved MRS culture medium is adopted as the fermentation culture medium, and the culture is carried out for 8 to 36 hours by using timing or continuous fed-batch fermentation mode under the aerobic or the facultative condition at 30 to 45 DEG C; the obtained fermentation liquid is sub-packaged or the fermentation liquid which is obtained by step c is separated, 1 to 25 percent drying protector is added in the bacterial sludge, and the granulation at 20 - 80 DEG C, freeze-drying or spray drying are adopted. The invention has the advantages that the invention can substitute the feed antibiotics and improve the high efficient weight increase of livestock and poultry; the production process is simple; the cost is low, etc.

The expression vectors and methods using an E. coli expression system for the large scale production of FGF18 are described. The vectors utilize the FGF18 coding sequence with specific changes in nucleotides in order to optimize codons and mRNA secondary structure for translation in E. coli. Using the expression vectors, the FGF18 gene was produced in E. coli to a level of greater than 1 g/L in fed batch fermentation. Also included are OmpT deficient E. coli strains, as well as OmpT and fhuA negative strains transformed with an FGF18 expression vector.

A method is disclosed for on-line prediction of performance of a fermentation unit, such as prediction of performance parameters like concentration of product, biomass, or sugar in the broth of a batch/fed-batch fermentation unit containing bacteria and nutrients. A computer model predicts a future product concentration based on current plant data. While a batch is in progress, model parameters are adjusted on-line based on plant data to reduce a mismatch between the plant data and model data. A method/fermenter model can be implemented as a software program in a PC that can be interfaced to a plant control system for on-line deployment in an actual plant environment. An on-line performance monitoring system can be used by plant operating personnel, to know the performance of the batch in advance for implementing corrective measures in advance to improve/maintain performance at desired level.

This invention is in the field of bacterial cultures and specifically relates to the optimization of culture conditions to improve the production of bacterial capsular polysaccharides from Streptococcus strains in fed batch culture and to novel purification methods suitable for production scale purification of bacterial capsular polysaccharides from Streptococcus strains resulting in higher levels of purity than previously obtained for production scale.

The invention relates to an epsilon-polylysine high-yielding strain and an epsilon-polylysine production method, and belongs to the biotechnical field. The epsilon-polylysine high-yielding strain EA-19 is named as Streptomyces albus, and the preservation number is CGMCC No.10156. The strain EA-19 is used to carry out fed batch fermentation culture, and the concentration of epsilon-polylysine in a fermentation liquid reaches 38.5-39 g/L. The epsilon-polylysine production method comprises is characterized in that the strain EA-19 is adopted to carry out fermentation culture. A bubbling technology is adopted, ventilation is carried out in and after the fermentation culture process, so epsilon-polylysine generated after fermentation exists in foams, and is separated from the fermentation liquid, so the technical problem of difficulty separation of epsilon-polylysine in present preparation methods is solved, a step of ion exchange which causes generation of a large amount of wastewater is omitted, and the product yield is improved by 50% or above. The method has the advantages of simple process, easiness in amplification, low energy consumption, small device investment, and easiness in realization of large-scale production.

The present invention relates to a process for preparing anthrax protective antigen protein from E. coli using fed batch culture. This process creates a constitutively expressing system for rapid, efficient, cost-effective and high-level production of anthrax PA from E. coli. The steps of the process involves, transforming E. coli DH5α cells with the recombinant constitutive expression plasmid containing the PA gene to obtain recombinant DH5α cells and testing the PA expression by lysis of said cells followed by denaturing gel electrophoresis and Western Blotting technique using PA antibodies. This is followed by fermentation and harvesting of the high cell density cells. The said cells are solubilized using 6-8 Molar Urea and separated by centrifugation. The urea denatured PA is isolated from said supernatant and purified and thereafter eluted.

The invention discloses a streptomyces and a multi-antibiotics metabolic regulation fermentation process. According to the method, nutrient media components are optimized, inorganic salt is added to disturb a metabolic network of streptomyces aureochromogenes, and a target production way is strengthened, so that the generation of products is promoted. Meanwhile, the multi-antibiotics fermentationprocess is optimized, and a method of flowing-feeding glucose is adopted for a feed supplement batch fermentation method, so that the fermentation unit and the production output are greatly improved,and the production cost is reduced.

The invention provides processes for continuous fed-batch fermentative production and continuous recycle fermentative production of mannitol.

The invention discloses a Bacillus velezensis LfF-1 strain and application thereof in protease production. The Bacillus velezensis LfF-1 strain is separated for a first time, the strain is preserved in the Guangdong Microbiological Culture Collection Center in August 16, 2019, and the preservation number is GDMCC NO: 60741. The strain has a remarkable capability for producing protease through fermentation, and types of cultures produced through protease fermentation can be enriched; a protease preparation can be produced by using the strain through a fermentation tank replenishing on-batch fermentation process, the activity of the protease is as high as 17.84 ten thousand U/g, the enzyme activity recovery rate is as high as 96.8%, types of conventional commercial protease can be greatly enriched, and the production efficiency of the protease preparation can be improved; and in addition, the method for producing the protease from the strain through fermentation is simple and feasible, and has wide application prospects in producing protein foods, functional peptide products or feed additives.

The invention discloses a cutinase producing gene engineering bacteria and use thereof and belongs to the technical field of bioengineering. Recombinant plasmid Tfu-0883-hlyAs/pET20b(+) is constructed, Escherichia coli E.coliBL21(DE3) is converted to obtain recombinant Escherichia coli Tfu-0883-hlyAs/pET20b(+)/E.coliBL21(DE3). A certain specific growth speed is controlled in a feed supplement batch fermentation manner, fermentation culture is performed for 30 to 34 hours, and the enzyme survival rate in fermentation supernate reaches 700 to 750U/Ml. In the invention, glycerol is used as a main raw material, a semisynthetic culture medium is adopted, and the cutinase producing gene engineering bacteria have the advantages of stability, convenient regulation and the like and are suitable for large-scale production.

The invention provides a production and fermentation process for citric acid. The process is characterized in that feeding liquid is refilled into a fermentation tank during the fermentation process of citric acid. According to the invention, through fed batch of the feeding liquid with high concentration of sugar during fed batch fermentation, the concentration of the acid through fermentative production is improved, and inhibition of high initial sugar concentration on fermentation of the citric acid is avoided. With the production and fermentation process provided by the invention, the concentration of the acid through fermentative production is improved, fermentative production intensity is enhanced, the conversion ratio of sugar to the acid during fermentation and the utilization rate of equipment are increased, and thus, economic benefits of an enterprise are increased and competitiveness of the enterprise is improved.

The invention discloses a modified AKTA pure chromatographic apparatus. On the basis of the structure of original standard AKTA pure, three multifunctional valves, as well as a second column position valve or a Loop ring valve, are added, so that two flow paths, which work simultaneously, are formed by three columns; one flow path is used for continuously loading a sample, while the other one flow path is used for pretreatment before and post-treatment after sample loading, so that continuous purification of a perfusion culture material solution is achieved. The modified apparatus can achieve low-cost, multi-cycle and automated purification of fed-batch culture solutions, avoids accumulation and degradation of the sample, can maintain the stability of the sample, is free of an extra large-volume buffer container, and is high in purification efficiency.

The invention belongs to the technical field of microbes and particularly relates to a high-efficiency preparation method of Iturin A and a homologue of Iturin A. The method comprises the following steps: culturing a Bacillus strain and a genetically modified bacterium thereof in a primary fluid medium, and then inoculating a secondary fluid medium with the primary fluid medium as a seed solution, wherein the strain can generate Iturin A and the homologue of Iturin A; after inoculating the secondary fluid medium with the seed solution, performing fermentation culture and the feed-batch culture of amino acid and the like; and collecting Iturin A and the homologue thereof from a fermentation culture solution after fermentation is over. The method provided by the invention has the characteristics of high production efficiency, easy industrialization and the like.