68 results about "Streptococcus zooepidemicus" patented technology

The invention discloses a novel method for producing high molecular weight sodium hyaluronate (HA-Na) with amino acid complex liquid as a nitrogen source through fermentation. In the method for producing the high molecular weight sodium hyaluronate, provided by the invention, yeast cream or yeast powder is replaced with the amino acid complex liquid as a fermentation nitrogen source of streptococcus zooepidemicus. The HA-Na with molecular weight of 2.2*10<6>D is obtained through control of a fermentation process. When the method is applied to industrial production, on the one hand, contents of hetero-protein and pigment in fermentation liquid can be effectively reduced, the step of subsequent HA-Na extraction is decreased, and the physical damage of the molecular weight of HA-Na in the fermentation liquid in the extraction process is reduced; on the other hand, the HA-Na production cost can be lowered, and the novel method has higher industrial application value. The HA-Na produced by the method has the molecular weight of 2.0-2.2*10<6>D, the alduronic acid content of 42.4-43.5%, the intrinsic viscosity of 3,064-3,115 and the protein content of 0.1%.

The invention relates to a production technology for fermentatively producing sodium hyaluronate by utilizing bacterium. The production technology comprises the following steps of: using streptococcus equi subsp. zooepidemicus (Streptococcus Zooepidemicus) as an original strain; mutagenizing by virtue of nitrosoguanidine, and also mutagenizing by virtue of a protoplast in the presence of ultraviolet rays; introducing a special culture medium; carrying out submerged fermentation to produce high-output hyaluronic acid; and then carrying out a relative separation and purification technology to obtain a high-purity sodium hyaluronate product. According to the production technology for fermentatively producing the sodium hyaluronate by utilizing the bacterium, under the culture conditions that the culture temperature is 32 to 38 DEG C, the pH (Potential Of Hydrogen) of fermentation liquor is maintained within the range of 5.0 to 9.0, and a fermentation tank is at speed of stirring of 150 to 600rev/min, the output of the hyaluronic acid is greatly increased; and the production technology is suitable for being applied to industrial production.

The invention discloses a method for producing hyaluronic acid with different molecular weights through reasonable regulation, belonging to the technical field of bioengineering. The method comprises the following steps: integrating hyaluronic synthase hasA from streptococcus zooepidemicus on a bacillus subtilis genome; performing modularized assembly and expression analysis on genes of UDP-GlcA and UDP-GlcNAc synthetic routes in bacillus subtilis, and producing hyaluronic acids with different molecular weights from the bacillus subtilis by controlling different UDP-GlcA and UDO-GlcNAc concentrations. The method disclosed by the invention can be used for laying a certain foundation for efficiently preparing the hyaluronic acids within a specified molecular weight range and is suitable for industrial production and application.

The invention discloses a method for preparing a low-molecular hyaluronic acid (HA) by adding a hyaluronidase liquid during microbial fermentation for production of the HA, and belongs to the technical field of bioengineering. The method comprises the following steps: adding the recombinant hyaluronidase obtained from leeches in fermentation of streptococcus zooepidemicus, and carrying out fed-batch fermentation so as to prepare the low-molecular HA and oligosaccharide (the molecular weight is lower than 105 Daltons) via a fermentation coupling enzymolysis method and improve the yield of the low-molecular HA at the same time. The method provides a certain foundation for the efficient preparation of the low-molecular HA and is suitable for industrial production.

The present invention relates to a streptococcus antigen C5a and a preparation method thereof. The streptococcus protective antigen C5a is an SEZC5a recombinant protein, which consists of 571 amino acids and has a molecular weight of 60.3kDa; a forward primer has one BamHI restriction enzyme cutting site, and a reverse primer has one EcoRI restriction enzyme cutting site. According to the preparation method of the streptococcus protective antigen C5a, the SEZ C5a recombinant protein is treated with cloning, expression and purification; and a series of biological engineering technologies and experiments on mice are applied to conduct system analysis on an rSCPZ. After vaccination, the rSCPZ can provide high protective efficacy; an anti-rSCPZ mice double-immunized serum has significant passive immune protection on mice; and the mice immunized by the rSCPZ show high level of antibody titer in serum. The anti-rSCPZ antibody can induce high level of bactericidal capability; an scpZ gene has a transcription level in SEZ (Streptococcus zooepidemicus) infected mice higher than that of culture in vitro; and the rSCPZ can adhere to hep-2 cells and inhibit cell infection ability of SEZ.

The invention discloses a recombinant Pichia pastoris for producing small-molecular hyaluronic acids and a construction method thereof, belonging to the technical field of bioengineering. Hyaluronic acid synthase hasA derived from Streptococcus zooepidemicus and UDP-glucose dehydrogenase tuaD derived from Bacillus subtilis are expressed in recombinant Pichia pastoris GS115 host to implement production of hyaluronic acids. Meanwhile, hyaluronidase derived from hirudo is integrated to the Pichia pastoris genome and subjected to secretion expression by constitutive promoters with different intensities; the secretion expression level of the hyaluronidase is controlled to prepare small-molecular hyaluronic acid products with different molecular weights; and the prepared products have different ranges of molecular weight, and have instruction and reference meanings for directly producing small-molecular hyaluronic acids within a specified range from microbes. The recombinant Pichia pastoris lays certain foundation for high-efficiency preparation of small-molecular hyaluronic acids, and is suitable for industrial production.

The invention discloses streptococcus zooepidemicus and a production process for preparing hyaluronic acid by using the same. The compound mutation technology is adopted to screen out strains with high hyaluronic acid yields and is combined with the fermentation technology. The yield of the hyaluronic acid product is as high as 7-9g/L. The hyaluronic acid obtained through fermentation is easy to separate and purify and is short in production period. Production is easy to control. The production process is suitable for large-scale industrial production, is high in yield and has the effect of greatly reducing the production cost.

The invention relates a novel biological polysaccharide, a method for producing the same and application of the same. The biological polysaccharide is prepared by fermenting Streptococcus zooepidemicus CGMCC No. 1988. The preparation method comprises the following process steps of preparation of an inclined plane seed, preparation of seed solution, optimization of fermentation condition, separation purification of products and the like. The biological polysaccharide produced by the method has the advantages of high yield, simple process step, low production cost and the like; and in a liter of fermentation liquid, the content of the polysaccharide is between 20 and 50g, and the whole yield reaches between 70 and 90 percent. The research on the structure and the physical property of the biological polysaccharide shows that the biological polysaccharide comprises a plurality of disaccharide folding structures adopting a connection mode shown in the figure 1, has the characteristics of the macro molecular net structure biological polysaccharide, can be widely applied in various fields such as medical treatment, foods, cosmetics, oil extraction, biological materials and the like, and has important realistic significance.

The present invention provides an efficient and improved process for the production and purification of high molecular weight hyaluronic acid (HA). One embodiment relates to providing growth conditions for production of high molecular weight HA in Streptococcus zooepidemicus. For example, growth in medium comprising a lower protein concentration, e.g., 1% casein hydrolyzate, and a higher sugar concentration, e.g., 5% sucrose, gave 5-6 g/L of high molecular weight HA in the range of 3.5-4.0×10⁶ Da. The present invention also provides an efficient process for the purification of HA comprising treatment with silica gel then active carbon, and subsequent diafiltration with less volume of solvent.

The invention discloses a method for producing hyaluronic acid (HA) by streptococcus zooepidemicus fermentation. In the method, normal hexane is added in the fermenting process of streptococcus zooepidemicus so that the content of the HA in a fermenting product is greatly improved. When the normal hexane accounting for 0.50 percent of total volume of fermentation liquor is added, the HA yield reaches a maximal value of 0.406 g/L and is improved by 33.56 percent compared with a comparison.

This invention discloses Streptococcus zooepidemicus (CGMCC No.1988) for reducing petroleum viacosity and increasing petroleum yield, and its application. Streptococcus zooepidemicus is applied by: inoculating in petroleum, and fermenting at 20-60 deg.C for 8-72 h. Streptococcus zooepidemicus can reduce petroleum viacosity from 8000-15000 mPa.s to 50-250mPa.s, increase petroleum acid value by 8-15 times and light component contents, reduce wax and glue contents by 50-95%, improve rheological property of petroleum, reduce interfacial tension between water and oil, increase organic acid contents in fermented petroleum, and increase oil layer pressure and petroleum fluidity. Besides, CO2, biogas and hyaluronic acid are generated during the fermentation process, thus fermented petroleum is easy to emulsify, moisten and disperse. Streptococcus zooepidemicus can be used in oil production, especially microbe-enhanced oil production and petroleum transportation.

The invention provides a method for preparing mask base materials. The method includes steps of acquiring coconut water, adding xylan and pectin into the coconut water, carrying out pasteurization, then inoculating acetobacter xylinum into the coconut water, cultivating the acetobacter xylinum until fibrous membranes with the thicknesses of 0.1-0.5 cm are formed on the surface of fermentation liquor, adding cellulase into the fibrous membranes, treating the fibrous membranes, then carrying out ultrasonic treatment on the fibrous membranes in sodium hydroxide solution, washing the fibrous membranes by the aid of clear water until the fibrous membranes are neutral, slicing the fibrous membranes and then carrying out freeze drying on the fibrous membranes to obtain cellulose substrates; acquiring streptococcus zooepidemicus fermentation liquor containing hyaluronic acid, centrifugally removing precipitates, adding supernate into albumen powder, uniformly mixing the supernate and the albumen powder with each other to obtain mixtures, then adding the cellulose substrates into the mixtures, carrying out ultrasonic treatment, taking out the cellulose substrates after ultrasonic treatment is completely carried out, thorough flushing the mixtures by the aid of clear water, carrying out freeze drying on the mixtures and then packaging the mixtures under vacuum conditions to obtain the mask base materials. The method has the advantages that the mask base materials prepared by the aid of the method are excellent in human skin compatibility, free of skin irritation and suitable for various skin types; the mask base materials contain abundant hyaluronic acid, the hyaluronic acid is uniformly distributed, excellent slow-release effects can be realized, the mask base materials are long in skin retention time and are nutritional, and moisture can be preserved.

The invention discloses recombinant Streptococcus zooepidemicus for fermentation of micromolecule hyaluronic acid and belongs to the technical field of bioengineering. Hyaluronidase derived from leeches is heterologously expressed in Streptococcus zooepidemicus, nine kinds of signal peptides are selected and are fused with the terminal N of the hyaluronidase, and an appropriate signal peptide is selected through comparison of enzyme activity through a Pspac-induced promoter and Streptococcus RBS so that efficient secretion and expression of hyaluronidase in Streptococcus zooepidemicus is realized. Through degradation of macromolecule hyaluronic acid produced by the Streptococcus zooepidemicus, active micromolecule hyaluronic acid is obtained and a yield is improved. The recombinant Streptococcus zooepidemicus lays a foundation for the efficient fermentation preparation of micromolecule hyaluronic acid based on a microbial system and is suitable for industrial production and application.

The invention discloses a method for culturing a high-stability sodium hyaluronate strain, which comprises the step of adoption of streptococcus zooepidemicus with a number of ATCC39920. The method is characterized in that the streptococcus zooepidemicus with the number of ATCC39920 is subjected to strain culture and fermentation culture; after repeating the steps and performing repeated tests for 200 times, a strain for fermentation is obtained; fermentation culture of sodium hyaluronate is performed in a fermentation medium; and the fermentation medium is subjected to slight sterilization for 20 minutes at the temperature of 121 DEG C, cooled and cultured at a temperature of between 36 and 37 DEG C and at a pH value of between 6.8 and 7.1, enters the after-treatment step after culturing the sodium hyaluronate for 30 hours without limiting the air flow, and the high-stability sodium hyaluronate is obtained. Under the same conditions, the prior strain which is not subjected to optimization treatment is used for fermentation and production of the sodium hyaluronate; and the stability of the sodium hyaluronate finished product is obviously higher than that of an external sodium hyaluronate sample by comparing and examining the stability of the two types of sodium hyaluronate.

The invention provides a preparation method and application of small molecular weight hyaluronic acid, and a hyaluronate lyase genetic vector and engineering bacteria. An expression vector successfully constructed is converted to Escherichia coli BL21 (DE3) by: cloning part of fragments encoding hyaluronate lyase gene (hylb) in genome of Streptococcus zooepidemicus ATCC 39920 and constructing the expression carrier pET 28a:hylb, and high-activity soluble hyaluronate lyase is obtained by the induced expression of Escherichia coli. Specific enzyme activity of purified liquid of the lyase is 4655 U/mg (equivalently 4.655*107 IU/mg) that is measured by N-acetyl-glucosamine (NAG) measurement. The small molecular weight hyaluronic acid is prepared by controlling the enzyme content and reaction conditions to degrade large molecular weight hyaluronic acid, the molecular weight of the hyaluronic acid is measured by means of an intrinsic viscosity method and agarose gel electrophoresis, and the obtained molecular weight is that of small molecular weight hyaluronic acid of 6000Da level, an infrared spectrogram of which is consistent with standard atlas in national pharmacopoeia.

The invention provides a method for producing hyaluronic acid by fermentation and an application of the method. The method comprises the following steps: performing activation and propagation on streptococcus zooepidemicus, then performing fermentation, supplementing a carbon source for once in the fermentation process to obtain a hyaluronic acid fermentation broth, and performing purifying to obtain hyaluronic acid. According to the fermentation method provided by the invention, the carbon source is added for once in the fermentation process, so that the glucose concentration in the fermentation broth can be maintained, the fermentation period is shortened, the contamination risk caused by adding the carbon source for a plurality of times is avoided, and normal growth and metabolism of thalli are facilitated. The invention solves the problem of unbalance between metabolism of streptococcus zooepidemicus and expression of products is solved, and the obtained hyaluronic acid has a highyield and a large molecular weight.

The invention belongs to the technical field of hyaluronic acid preparation and particularly relates to a method for improving the fermentation yield of hyaluronic acid. Streptococcus zooepidemicus is taken as a hyaluronic acid fermentation strain; a reagent containing ferrous ions and copper ions is added to a culture medium used. The method provided by the invention is capable of improving the fermentation yield of hyaluronic acid by 30-34%, from 1.05 g/L to the range from 1.37 g/L to 1.41 g/L, and reducing the cost by 30%; meanwhile, the method provided by the invention has no influence on the molecular weight and quality of a product.

The invention relates to a novel method for producing hyaluronic acids (HA) with different molecular weights through pichia pastoris gene-regulation fermentation. The method comprises the steps that: recombinant plasmid pGAPZalphaA-szHasA constitutively expressing streptococcus zooepidemicus hyaluronic acid synthase and recombinant plasmid pPICZalphaA-ph20 inducibly expressing recombinant human hyaluronidase are used for converting yeast cells, such that a target strain HAS-PH20 is obtained. Through different gene regulation and induction methods, the yeast engineering strain HAS-PH20 directly produces various hyaluronic acids with different molecular weights through fermentation processes. With the method, the coupling of hyaluronic acid molecular weights and gene regulation methods is realized, and hyaluronic acids with specific molecular weights can be prepared according to requirements.

The invention discloses a material supplement method for hyaluronic acid fermentation. The method comprises the steps that streptococcus zooepidemicus is inoculated to a culture medium of slope bacterial strains, and activated streptococcus zooepidemicus bacterial strains are obtained; an appropriate amount of glucose, yeast powder, peptone, dipotassium phosphate and magnesium sulfate are taken, poured into a seed culture medium for mixing and then sterilized; the activated streptococcus zooepidemicus bacterial strains are inoculated to the seed culture medium to obtain a seed solution, and the seed solution is inoculated to an amplification culture medium for amplification culture to obtain an amplification culture solution. The material supplement method for hyaluronic acid fermentationhas the advantages that the materials are conveyed into a fermentation tank for inoculated fermentation through a batch or continuous material supplement mode, the concentration of Ca and Mg ions in afermentation solution is increased, the reaction among all components of the fermentation solution in the preparation process at the early period is reduced, damage to nutrient components is reduced,the utilization rate of the nutrient components is increased, fermentation is facilitated, the fermentation viscosity reaches 63,750 mPa*s, and the method helps to improve the fermentation quality and increase the fermentation yield.