36results about How to "Improve biotransformation efficiency" patented technology

The invention discloses a method for producing lactic acid from bagasse. The method comprises the following steps: grinding and filtering bagasse: adding water to the bagasse, carrying out wet grinding on the bagasse by virtue of a disc mill and sieving the bagasse; carryin gout green liquor-ethanol coupling pretreatment: carrying out a pretreatment course in a pressure-proof reaction kettle, adding the ground bagasse to the reactor and adding a green liquor, wherein heating temperature is 140-145 DEG C and reaction duration is 2-4h; filtering after the pretreatment so as to obtain solid residues; carrying out synchronous saccharification and fermentation: adding cellulase and lactobacillus strain to the solid residues obtained from pretreatment in a mode of taking the solid residues as a fermentation substrate, and reacting at 45 DEG C at pH value of 4.8-5.0 for 72-96h so as to produce the lactic acid. The method for producing the lactic acid from bagasse disclosed by the invention is high in conversion rate of hydrolyzing cellulase into cellulose and semi-cellulose; and the utilization rate of bagasse resource component is high and production cost is low.

The invention discloses a method for constructing a bacterial strain with improved methanol tolerance by mutating the cgl2365 gene and / or the cgl2857 gene in the bacterial strain. The invention also discloses the constructed methanol biotransformation strain with improved methanol tolerance and a method for utilizing the strain to carry out methanol biotransformation. When the bacterial strain constructed by the present invention utilizes the mixed carbon source composed of methanol and other auxiliary carbon sources, the utilization ratio of methanol is significantly increased, thereby substantially improving the methanol utilization efficiency of the bacterial strain.

The invention discloses an application of a novel microbial strain Saccharomyces cerevisiae CGMCC No.2230 in microbial transformation preparation of (S)-(-)-3-chlorine-1-phenylpropanols. The application of the invention is that: 3-chlorine-1-propiophenones are taken as substrates, and immobilized cell particles which are prepared by fermentation broth obtained after fermentation of the Saccharomyces cerevisiae strain CGMCC No.2230 are taken as biocatalysts; transformation reaction time of transformation liquid is 8 to 72 hours at the temperature of 25 to 30 DEG C in dibutyl phthalates, and the product S)-(-)-3-chlorine-1-phenylpropanols are obtained after separation and purification of the transformation liquid. The microbial transformation method has the advantages of friendly surroundings, mild reaction conditions, simple product separation, high substrate transformation ratio, good product purity and biocatalysts capable of being reused, and is suitable for commercial process.

The invention relates to a preparation method for d-pseudoephedrine by a microbe transformation, belonging to the fermentation and biotransformation field, which is characterized in that a 1-phenyl-2-methylamino acetone is acted as a transformation precursor, the Morgan bacteria is transformed into a microbe, and the d-pseudoephedrine is produced through the procedures of fostering the microbe, collecting the cells, immobilizing the cells, and biotransformation. The preparation method for d-pseudoephedrine by a microbe transformation has the advantages of directly utilizing the microbe transformation to produce d-pseudoephedrine without a chemical resolving agent and a chemical splitting, not only saving the cost but also facilitating to protect the environment; having high efficiency of the biotransformation and strong specific target with the produced d-pseudoephedrine percentage being larger than 99.0%; possessing of simple process and low production cost because the other ephedrineis also able to produce based on the same process and equipment, for example, 1-pseudoephedrine.

The invention relates to a method for fruiting bag-cultivated mushroom at one time. The method comprises the operation steps of mushroom selection, inoculated culture, test tube expanding, cultivated species inoculation, cultivated species culture, strain treatment, raw material pretreatment, material batching and stirring, mushroom stick packaging, mushroom stick sterilization, mushroom stick inoculation, mushroom stick cultivation, mushroom stick coloring, mushroom stick pretreatment and mushroom stick fruiting. Coarse and fine culture base materials of a mushroom stick produced by utilizing the scheme are reasonably matched, nutrient substances are full, and perlite in a formula has the functions of holding moisture, ventilating air, regulating the potential of hydrogen and providing multiple microelements needed by the growth of the mushroom; meanwhile, oak chips and apple chips are mixed with corncobs, so that the ventilation of the mushroom stick is improved, the biotransformation rate of the mushroom is improved favorably, biotransformation of the mushroom stick can be promoted by virtue of a great number of microelements in canal mud, the uniformity of mushroom stick fruiting is improved by pre-cooling a mushroom bag, the mushroom stick fruiting speed is increased by utilizing the stimulation of the difference between pre-cooling temperature and external environment temperature, and the biotransformation rate is improved by 10-20 percent.

The invention discloses a magnetically immobilized yeast cell and its application in the preparation of (R)-2-hydroxy-4-phenylbutyrate ethyl ester. The magnetically immobilized yeast cell is made of lysine-modified magnetic nano The particles are mixed with the yeast cell solution, fixed in a shaker at 20°C-40°C, 130-170r / min for 2-6h, after the reaction, magnetically separated, the precipitate is washed with deionized water, and freeze-dried to obtain magnetically immobilized yeast cell. The immobilization method of the invention effectively improves the stability of the yeast cells and enhances the tolerance of the cells to the substrate solution. Under the action of an external magnetic field, the magnetically immobilized cells are easier to separate from the reaction system, which is beneficial to the separation and extraction of products and simplifies the process flow. Appropriate magnetic field frequency and magnetic field strength in the alternating magnetic field reactor can effectively enhance the mass transfer process of the reaction system, significantly shorten the reduction reaction time, and then improve the biotransformation efficiency.

The invention discloses a high-ammonia-nitrogen autotrophic denitrification device, which belongs to the technical field of wastewater treatment. The device includes a reactor main body, the bottom of which is connected to a third pump body through a delivery pipe body, and a three-phase separator, which is arranged in the upper part of the reactor main body , the bottom side wall of the reactor main body is connected with the second pump body through the conveying pipe body, the filler filling assembly is arranged in the reactor main body, and the ultrasonic processing assembly is arranged above the three-phase separator, and the ultrasonic processing assembly includes a hollow fiber membrane, a hollow fiber There is a superoxide combination pipe body above the membrane, and the superoxide combination pipe body is connected to the superoxide assembly respectively. The superoxide assembly is composed of a low-frequency ultrasonic vibrator and an air pump. The loss of the medium shortens the initial start-up time, realizes the microcirculation flow of the internal medium, improves the mass transfer effect, and ensures the stable operation of the denitrification process.

The invention discloses a fruity selenium-enriched Cordyceps militaris yogurt product and a preparation method thereof. By preparing the Cordyceps militaris biomass, the cell wall permeability of the Cordyceps militaris strain is changed, and the selenium-enriched culture is carried out at the same time, which can significantly improve the selenium-enriched content of the Cordyceps militaris ability, and then use low-fat and low-sugar skim milk, selenium-enriched Cordyceps militaris fermented mycelia homogenate as raw materials, and add hawthorn powder, pine pollen, vitamin C, etc. to carry out mixed-bacteria fermented yogurt to prepare a low-fat and low-sugar , the selenium-enriched Cordyceps militaris yogurt with the function of lowering blood lipids solves the problems of single function of fresh yogurt, is not conducive to storage, and cannot be eaten by diabetics, and enhances the health care function of lowering blood lipids of yogurt. As a health food, it has a good development prospect.

The invention aims at providing a culturing system capable of improving fermentation efficiency of anaerobic gas feeding microorganisms. According to the system, a culturing medium is optimized, and therefore in the shake cultivation or continuous gas passing stir cultivation process, the gas and liquid mass transfer efficiency is improved, so that the fermentation efficiency of the anaerobic gas feeding microorganisms is improved. According to a method for improving the fermentation efficiency of the anaerobic gas feeding microorganisms, simethicone and / or kieselguhr are / is added into the culture medium and / or fermentation liquor of the anaerobic gas feeding microorganisms. According to the method, the gas and liquid mass transfer speed can be improved in the gas fermentation process, and the efficiency of gas biotransformation is effectively improved.

The invention belongs to the technical field of microbial control of heavy metal pollution, and discloses the application of a thermophilic acid thiobacillus, specifically the application of a new strain DX-csu in Acidithiobacillus caldus. The preservation number of the strain is CGMCC No.14008; naming For Acidithiobacillus caldus. The Acidithiobacillus caldus bacterium of the invention has a good biotransformation effect on the cadmium in the iron-manganese bonded state in the soil, and provides technical guidance for efficient metal leaching by microorganisms, environmental treatment and the like.

The present invention discloses a method for increasing the alcohol fermentation yield through a Trichoderma viride fermentation extract. The method at least comprises: (1) adopting straws as a raw material to carry out solid state fermentation, wherein straw powder is added to a fermentation barrel, water and ammonium nitrate are added, complete stirring is performed, Trichoderma viride CGMCC3.6619 is inoculated to make the strain and the straw powder completely contact, continuous culturing is performed for one month, and drying is performed after completing the fermentation to obtain a fermentation matrix for spare; (2) carrying out extraction and purification on the extract alcohol fermentation auxiliary agent, wherein the fermentation matrix is soaked with a NaOH solution, constant temperature treatment and filtration are performed, the filtrate is concentrated to prepare a raw liquid, the pH value of the raw liquid is adjusted to 2.0, standing, centrifugation and precipitate removing are performed, and the supernatant is subjected to spray drying to a product alcohol fermentation auxiliary agent; and (3) carrying out alcohol fermentation, starch is taken and added to clear water, stirring is performed to make the starch be uniformly dispersed in the water, liquid high-temperature amylase and calcium chloride are added, the pH value is adjusted, liquid glucoamylase is added, cooling is performed after completing the saccharification, activated yeast and the alcohol fermentation auxiliary agent are added, and fermentation is performed in a constant temperature chamber.