148 results about "Dextrose solution" patented technology

According to the preparation method of the Fe-Co-Ni-Cu-Zn high-entropy sensing material, the Fe-Co-Ni-Cu-Zn high-entropy sensing material is obtained by preparing an electroplating solution, adjusting the concentration and the PH value of the electrolyte and conducting sensitive material preparation on Fe, Co, Ni, Cu and Zn elements through an electrochemical method, and the preparation method is easy and convenient to operate, low in cost and energy consumption and suitable for industrial production. The elemental composition, the structure morphology, the performance and the like of the high-entropy alloy can be easily controlled by changing deposition parameters (time, temperature and the like) through electrochemical deposition; the Fe-Co-Ni-Cu-Zn high-entropy sensing material prepared by the invention can be used as a sensing electrode to test urea and glucose solutions with different concentrations, and is high in detection precision, good in stability and high in zero-degree sensitivity.

The invention provides a preparation method of biomass porous carbon for a supercapacitor electrode, which is prepared by mixing biomass waste and glucose and then carbonizing, and comprises the following steps: washing the biomass waste, drying, then mechanically crushing and sieving to obtain biomass waste powder; mixing the biomass waste powder with a glucose solution, uniformly stirring, drying and dehydrating; the mixed powder is washed and dried after being subjected to high-temperature carbonization treatment, and pre-carbide is obtained; mixing the pre-carbide with an alkaline activator, drying, performing high-temperature carbonization activation, and washing and drying after activation to obtain a target product. Domestic common biomass waste is efficiently recycled, biomass waste powder, especially passion fruit peel powder, is soaked in a glucose solution to prepare the porous carbon material with abundant micropores, and a supercapacitor electrode prepared from the carbon material has good charge and discharge performance, large specific capacity and obviously prolonged charge and discharge time, and has a good application prospect. The porous carbon electrode is obviously superior to a porous carbon electrode prepared from a single raw material.

The invention belongs to the technical field of microbial fermentation, and particularly discloses a method for producing gamma-aminobutyric acid by using lactobacillus hilgardii and an application of the gamma-aminobutyric acid. The method comprises the following steps: (1) activating strains; (2) culturing a seed solution; (3) fermentation culture: inoculating the third-stage seed solution into a fermentation tank filled with a fermentation culture medium, and carrying out two-stage fermentation culture to obtain a fermentation solution; in addition, a glucose solution or a sodium glutamate solution is fed in the whole fermentation process, and an agaric water extraction solution and a bifidobacterium longum fermentation solution are fed in the first-stage fermentation and the second-stage fermentation respectively; and (4) inactivating and filtering. According to the method disclosed by the invention, a two-stage fermentation control strategy is adopted in the main fermentation process, and meanwhile, specific supplemented materials are fed in a fed-batch manner, so that the growth of thalli can be effectively promoted, the metabolic state of the thalli is optimized, and more metabolic flux is guided to synthesis of GABA, thereby effectively improving the yield of GABA.

The invention discloses sprayable hydrogel for healing a bacterial infected wound and a preparation method of the sprayable hydrogel. The preparation method comprises the following steps: preparing a g-C3N4 nanosheet by taking melamine as a precursor, and then preparing AuNPs-C3N4 nano-enzyme on the g-C3N4 nanosheet through in-situ reduction of HAuCl4. 3H2O; preparing oxidized hyaluronic acid through a sodium periodate oxidation method; the preparation method comprises the following steps: incubating an AuNPs-C3N4 nano-enzyme solution and a glucose solution, adding a Mn < 2 + >-containing manganese salt solution and a bicarbonate solution, then mixing with an oxidized hyaluronic acid solution to obtain a dispersion liquid, spraying the dispersion liquid and a carboxymethyl chitosan solution in a cross-phase manner, and carrying out a Schiff base reaction to prepare the AuNPs-C3N4 / Glu / Mn < 2 + >-carboxymethyl chitosan-OHA hydrogel. The method is simple in preparation process, and the prepared hydrogel can have excellent in-vitro antibacterial efficiency, good biocompatibility and bacterial adsorbability, and can effectively remove bacteria at wound infection parts and promote wound healing.

Hexavalent chromium (Cr (VI)) is widely applied to the industries of electroplating, spinning, leather tanning and chromium product manufacturing, and Cr (VI)-containing sewage has very strong biotoxicity and mutagenicity. Therefore, effective removal of Cr (VI) in industrial wastewater has important significance for protecting ecological environment and human health. As a novel bismuth-based oxychloride photocatalyst, the Bi4NbO8Cl material with the Aurivillius-Sillen structure has the advantages that the unique layered molecular structure of the Bi4NbO8Cl material is beneficial to the separation of photon-generated carriers, and the Bi4NbO8Cl material has good photocatalytic performance. On the basis of a Bi4NbO8Cl visible light response photocatalyst, the concentration of a glucose solution is regulated and controlled, carbon shell layers with different thicknesses are loaded, meanwhile, oxygen vacancy defects with different concentrations are formed, the visible light response Bi4NbO8Cl (at) C composite photocatalyst is obtained, and a good effect is achieved when the visible light response Bi4NbO8Cl (at) C composite photocatalyst is used for treating Cr (VI)-containing wastewater under the acidic condition.

The invention relates to a preparation method and application of carbon nanosphere modified biomass monolithic composite porous carbon, and belongs to the field of energy and chemical industry, and the preparation method comprises the following steps: S1, cutting pine into pine chips, drying, and carbonizing at high temperature to obtain a carbonized product; s2, dipping the carbonized product in a hydrochloric acid solution, then washing the carbonized product to be neutral, dehydrating the carbonized product, and polishing the dehydrated carbonized product; s3, putting the composite porous carbon into a glucose solution, carrying out vacuum-assisted impregnation, transferring into a hydrothermal reaction kettle, carrying out hydrothermal carbonization, drying, and carrying out constant-temperature chemical conversion; and S4, placing the composite porous carbon in a potassium bicarbonate solution for vacuum impregnation, drying and dehydrating, placing in a tubular furnace for constant-temperature chemical conversion to obtain a converted and carbonized product, impregnating in hydrochloric acid, washing, and drying. The specific surface area of the integral composite porous carbon is effectively increased, the electrode / electrolyte interface contact characteristic is remarkably optimized, and the pore channel space utilization rate and the energy storage performance are synchronously improved.

The invention provides antibacterial bacterial cellulose as well as an anaerobic fermentation preparation method and application thereof, and belongs to the technical field of antibacterial materials and biological materials. Tea polyphenol and a glucose solution are extracted from waste tea residues to prepare a fermentation culture medium, bacterial cellulose is produced by bacterial cellulose producing bacteria under the anaerobic condition, the tea polyphenol does not have antibacterial activity under the anaerobic condition, fermentation production of in-situ modified bacterial cellulose is achieved under the anaerobic condition, and the bacterial cellulose production efficiency is improved. The tea polyphenol-containing bacterial cellulose membrane with strong antibacterial activity, good blood compatibility and slow release effect is obtained, the problem that an oxygen dependent antibacterial activity modifier cannot be used for preparing antibacterial bacterial cellulose for a long time is solved, and a new choice is provided for food packaging, medical dressings, cosmetic materials and the like.

The invention relates to the technical field of spectral analysis, and discloses a glucose solution concentration detection method and system based on a near infrared spectrum. The method comprises the following steps: acquiring transmission light intensity of a sample and a reference liquid by using a narrow-band near-infrared LED light source, calculating absorbance characteristics, screening a dynamic wavelength set based on sensitivity, and constructing a concentration prediction model to realize accurate detection of concentration. Compared with the prior art which depends on single wavelength or lossy detection, especially under the condition of temperature and humidity fluctuation or unstable light source power, the technical problem that high-precision concentration measurement cannot be realized is solved. High-precision glucose concentration detection under complex environmental conditions is realized, so that the problem of error accumulation caused by environmental interference is avoided, the detection precision, stability and environmental adaptability of the system are improved, and the reliability and accuracy of glucose solution concentration detection are improved.

A sprayable hydrogel for wound healing caused by bacterial infection and a preparation method thereof, comprising the steps of preparing g-C3N4 nanosheets with melamine as a precursor, and then in-situ reducing HAuCl4·3H2O on the g-C3N4 nanosheets to prepare AuNPs-C3N4 nanozymes; preparing oxidized hyaluronic acid by a sodium periodate oxidation method; incubating the AuNPs-C3N4 nanozyme solution with a glucose solution and then adding a Mn-containing 2+ The manganese salt solution and bicarbonate solution were then mixed with the oxidized hyaluronic acid solution to obtain a dispersion, and the dispersion was sprayed with the carboxymethyl chitosan solution to produce the AuNPs-C3N4 / Glu / Mn 2+ @Carboxymethyl chitosan-OHA hydrogel. The preparation process of this method is simple, and the prepared hydrogel has excellent in vitro antibacterial efficiency, good biocompatibility and bacterial adsorption, which can effectively remove bacteria from wound infection sites and promote wound healing.

The invention relates to a method for preparing bio-based isosorbide dimethyl ether through resin catalysis, and belongs to the technical field of organic synthesis. Adding corn starch into a sulfuric acid solution, hydrolyzing into glucose, and filtering to obtain a glucose solution; adding a solid acid catalyst into the concentrated glucose solution, and filtering after reaction; carrying out reduced pressure distillation on the filtrate to obtain an isosorbide crude product, and purifying through recrystallization; the preparation method comprises the following steps: adding isosorbide, a methylation reagent and a basic catalyst into a reaction kettle, stirring for reaction, cooling and filtering; and distilling the filtrate, and collecting fractions to obtain high-purity isosorbide dimethyl ether. The solid acid catalyst is sorbic acid based styryl macroporous cation exchange resin; the styryl macroporous cation exchange resin is soaked in sulfuric acid to be activated and then is mixed with sorbic acid chloride, 2-thiophenecarbonyl chloride and zinc chloride to react, and then washing and drying are performed to prepare the solid acid catalyst; the isosorbide dimethyl ether prepared by the method disclosed by the invention is high in purity and relatively high in yield.

The invention relates to the technical field of iodide content detection, in particular to a method for determining radiochemical purity and iodine content of sodium iodide capsules for diagnosis by HPLC (High Performance Liquid Chromatography), which comprises the following steps: setting chromatographic conditions, and connecting a radioactive flow detector and an ultraviolet detector in series; preparing a disodium hydrogen phosphate solution, a glucose solution, a vitamin C solution, a first control solution, a potassium iodate solution, a second control solution, a carrier solution, a first sample solution, a second sample solution, a negative control solution and a test solution; and determining the radiochemical purity and iodide content of the first sample solution and the second sample solution in three batches based on the chromatographic conditions and the determination standard. According to the method, test parameters such as capsule sample analysis time, a pretreatment mode and a sample size are optimized, the radiochemical purity of the capsule is accurately determined, and the iodide content is controlled, so that the problem that main components cannot be accurately quantified and potential radioactive impurities cannot be detected by a traditional diagnosis sodium iodide [131I] capsule determination method is solved.

The invention relates to the technical field of boron carbide production, in particular to a continuous production method and device for high-purity superfine boron carbide, and the production method comprises the following steps: S1, preparing materials; boric acid, glucose and PVA are prepared and dissolved in water to prepare a boric acid solution, a glucose solution and a PVA solution for standby application; step S2, pulping; adding a glucose solution into the boric acid solution in the stirring process, and stirring and mixing for 3-4 hours to obtain a mixed solution; adding a PVA solution into the mixed solution, stirring and mixing, and injecting into a graphite mold; s3, performing dehydration, carbonization and carbon thermal reduction reaction to generate boron carbide; and S4, boron carbide purification. Compared with the prior art, a complex can be formed between boric acid and glucose to realize molecular-level contact of boron and carbon, the reaction activity is high, the reaction temperature is effectively reduced, the particle size of boron carbide is reduced, other materials are not used for doping, only carbon and boron exist in reactants, and the purity of boron carbide is high.

The invention discloses application of 4-aminoquinazoline in female mosquito reproduction control, which is characterized in that 4-aminoquinazoline powder is dissolved in a dimethyl sulfoxide (DMSO) solvent and then is proportionally mixed with a glucose solution, and ovarian development of female mosquitoes is inhibited by a method of feeding female adult mosquitoes in mouths, so that the egg laying amount of the female mosquitoes is reduced. The new application of the existing drug 4-aminoquinazoline is developed, the quantity of mosquito populations is controlled by directly inhibiting the reproductive potential energy of female adult mosquitoes, and a new solution is provided for the current situation that current mosquito chemical insecticides are generally resistant in China.

The application belongs to the technical field of microbial fermentation, and specifically discloses a method for producing gamma-aminobutyric acid by using Lactobacillus hilgardii and application of the method. The method comprises the following steps: (1) activating the strain; (2) seed liquid culture; (3) fermentation culture: inoculating the tertiary seed liquid into a fermentation tank containing a fermentation medium, and performing two-stage fermentation culture to obtain a fermentation liquid; and in the whole fermentation process, glucose solution or sodium glutamate solution is continuously added, and in the first-stage fermentation and the second-stage fermentation, black fungus water extraction solution and long bifidobacterium fermentation solution are continuously added, respectively; and (4) inactivation and filtration. The method can effectively promote the growth of the bacteria and optimize the metabolic state of the bacteria by adopting a two-stage fermentation control strategy and continuously adding specific feed in the main fermentation process, so that the metabolic flow is more directed to the synthesis of GABA, thereby effectively improving the yield of GABA.

This invention discloses a carbon-coated Fe-Co-Ni-B magnetic micron alloy particle, its preparation method, and its application. The method includes the following steps: dissolving iron acetylacetonate, cobalt acetylacetonate, and nickel acetylacetonate in anhydrous ethanol, then adding cyclopentylboric acid and dissolving it to obtain a mixed solution; subjecting the mixed solution to a solvothermal reaction; and after post-treatment to obtain boron-doped pre-decomposition precursor powder. A glucose aqueous solution is then added dropwise to the pre-decomposition precursor powder under stirring and mixed uniformly to ensure uniform adsorption and coating of the glucose solution on the powder surface. The powder is then dried to obtain a glucose-coated composite precursor. The composite precursor is subjected to programmed temperature heat treatment under an inert or weakly reducing atmosphere to obtain carbon-coated Fe-Co-Ni-B magnetic micron alloy particles with a core-shell structure. This invention successfully prepares a magnetic composite material possessing high saturation magnetic properties, good chemical stability, and controllable magnetic properties.

The invention provides a method for leaching chromium in high-chromium tanning sludge, and belongs to the technical field of treatment of heavy metals in leather tanning sludge. The method comprises the following steps: mixing the high-chromium tannery sludge with dilute sulphuric acid, and carrying out acid leaching to obtain a chemical leaching solution and chemical leaching residues; diluting the chemical leaching residues, inoculating domesticated composite thiobacillus species, adjusting the pH value, adding a nutritional agent, and carrying out bioleaching to obtain a bioleaching solution and bioleaching residues; and finally, mixing the chemical leachate, the biological leachate, a sulfuric acid solution, a sodium dichromate solution and a glucose solution, adjusting the alkalinity, and stirring to obtain the chrome tanning agent. According to the method for leaching the chromium in the high-chromium tanning sludge, the removal rate of the chromium can reach 99% or above, the effect is remarkably superior to that of a single process, the method is a feasible and optimal process at the current stage, the chromium leaching solution is further processed and treated and enters a chromium tanning section to serve as a chromium tanning agent, and cyclic utilization is achieved.

This invention proposes a high-resolution dual-entry cavity sensor based on negative resistance compensation, comprising a passive resonant cavity, a microfluidic chip, and a negative resistance compensation circuit. It utilizes a common metal layer between two resonant cavities to isolate them from each other while requiring only one negative resistance compensation circuit to compensate for the energy of both cavities. By etching a microstrip line + stripline structure on the common metal layer to connect a negative resistance compensation circuit designed with transistors and diodes, simultaneous and independent energy compensation for the two resonant cavities is achieved, thereby improving the quality factor at their corresponding resonant frequencies and enhancing detection sensitivity. Simultaneously, embedding two microfluidic chips in the gap region where the electric field strength of the resonant cavity is strongest gives the proposed sensor both extremely high resolution and high sensitivity, improving the overall performance of the sensor. The sensor is suitable for detecting trace amounts of solute in liquid solvents, particularly for characterizing the concentration of glucose solutions.

The present invention belongs to microbial fermentation, and in particular refers to a chitosanase with high activity and its preparation and application. The chitosanase production strain is inoculated into a sterilized fermentation medium containing a carbon source, a nitrogen source and necessary nutrients, the pH of the fermentation medium is adjusted to 35°C-37°C for ventilation fermentation; during the fermentation, ammonia water is added to control the pH, and glucose solution is added to control the glucose concentration in the medium; when the OD of the fermentation medium reaches 1.5, the pH of the fermentation medium is adjusted to 1.5, and the glucose concentration in the medium is adjusted to 1.5. 600 When the temperature is ≥30, an inducer is added to induce the culture and the fermentation temperature is reduced to 30°C-33°C; when the enzyme activity in the fermentation broth no longer increases or the fermentation cycle is ≤30 hours, the fermentation is completed to prepare a fermentation broth containing chitosanase, and a crude enzyme solution containing chitosanase is obtained by high-pressure homogenization and centrifugation. The present invention solves the problem of low chitosanase activity in the prior art, and has the advantages of high chitosanase activity, small molecular weight of degraded chitosan oligosaccharides, simple fermentation and degradation processes, etc.

The invention discloses a non-invasive real-time blood glucose monitoring system based on a microwave biosensor, which comprises the following steps of: according to a non-invasive blood glucose monitoring method, carrying out structural design on the microwave sensor, and optimizing structural parameters of the sensor by utilizing simulation software to obtain structural parameters with excellent performance. A six-degree-of-freedom mechanical arm is designed for a test tube used by a measuring system according to parameters such as the size of a sensor to realize a clamping function; building a measuring system based on the designed sensor and the mechanical arm; performing optimization design on visual positioning, path planning and high-precision sensing of the measurement system; manufacturing the microwave sensor by using a photosensitive blue oil technology, and preparing solutions with different concentrations required for monitoring; measuring the glucose solutions with different concentrations by the built measurement system to obtain an S21 parameter obtained by measurement; through data summarization, the resonant frequency data obtained by the measurement system is fitted to obtain the change relationship between the S21 resonant frequency and the concentration of the glucose solution.

The present invention relates to glucose solutions for parenteral administration comprising glucose and a pharmaceutically acceptable form of iron, as well as to containers comprising, in separate chambers, said glucose solutions and a lipid emulsion for parenteral administration and / or an amino acid solution for parenteral administration.

The invention relates to a graphdiyne-coated sulfur-doped modified carbon negative electrode material as well as a preparation method and application thereof. The preparation method of the carbon negative electrode material comprises the following steps: carrying out hydrothermal treatment on a glucose solution to obtain black powder, mixing the black powder with sulfur powder, and heating and carbonizing in an inert atmosphere to obtain a C-S material; dispersing the obtained C-S material in a solvent, and carrying out heating reaction to obtain a reaction solution; then adding an HEB graphdiyne monomer solution into the reaction solution to obtain a reaction mixture; and under a dark condition, carrying out heating reaction on the obtained reaction mixture in an inert atmosphere to obtain the carbon negative electrode material. The sulfur-doped and graphdiyne-coated synergistically modified carbon negative electrode material provided by the invention is stable in structure and excellent in electrochemical performance. The graphdiyne coating layer can inhibit volume expansion in the charging and discharging process, enhance the structural stability, provide additional lithium storage sites and realize long-life cycle under the fast charging condition.

The utility model provides a glucose solution filling assembly for testing an electrochemical biosensor and a detection device, and relates to the technical field of biosensor detection, the glucose solution filling assembly comprises a liquid storage tank, a confluence piece, a constant-temperature water bath kettle and a sensor assembling assembly, the confluence piece is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end is communicated with the accommodating cavities in a time-sharing manner and is higher than the liquid outlet end, the constant-temperature water bath pot receives a glucose solution discharged from the liquid outlet end, and the sensor assembling component fixes the electrochemical biosensor; in a non-filling state, the sensor assembling component and the confluence piece are close to and far away from the constant-temperature water bath kettle respectively, and in a filling state, the sensor assembling component and the confluence piece exchange position states respectively. By optimizing the pipeline connecting structure, the problems that an existing pipeline is complex in arrangement and large in occupied space are solved, and in the filling state and the non-filling state, the problem that glucose solution filling flexibility is poor is solved through movement matching of the confluence piece and the sensor assembling assembly.

The present application belongs to the technical field of biological fermentation and discloses a process for the production of L-histidine by biological fermentation. It comprises the following steps: inoculating a seed solution of Escherichia coli into a fermenter containing a fermentation medium at a culture temperature of 35-37°C, maintaining the reducing sugar content at 46 g / L by adding a glucose solution containing adenosine monophosphate in fed-batch increments, stopping the addition of the glucose solution 4 hours before the end of fermentation, maintaining the pH in the fermenter at 6.9-7.1 by adding ammonia solution in fed-batch increments, and adding an antifoaming agent to control foaming, with the fermentation time being 40-50 hours, thereby obtaining an L-histidine fermentation solution.The process according to the present application exhibits high fermentation efficiency and low production costs and is suitable for industrial production.

The invention relates to the technical field of fermentation production, and discloses a method for fermenting and producing guanosine, comprising the following steps: inoculating a guanosine-producing strain into a slant culture medium for activation culture; then inoculating into a primary seed culture medium for culture to obtain a primary seed solution; inoculating the primary seed solution into a secondary seed culture medium for culture to obtain a secondary seed solution; inoculating the secondary seed solution into a fermentation culture medium, controlling the initial air volume of the fermentation equipment to be 700-900L / h and the initial rotation speed to be 200-400rpm, increasing the air volume and rotation speed according to the OD growth during the fermentation process, and controlling the dissolved oxygen content to be ≥30%; after the air volume and rotation speed are exhausted, when the OD value is 20-25, adding a glucose solution for the first time; when the residual sugar content of the fermented liquid is 5-7%, adding a glucose solution for the second time; when the residual sugar content of the fermented liquid is ≤1.0%, the fermentation is terminated. By adding a glucose solution to dilute the fermented liquid during the peak growth period of the microorganism, the oxygen consumption rate of the microorganism can be reduced, the dissolved oxygen level can be stabilized, and the guanosine yield and conversion rate can be improved.

This invention belongs to the field of agricultural biotechnology, specifically relating to the application of a compound biological agent in agriculture. The compound biological agent comprises live engineered Bacillus subtilis bacteria and a 3% glucose solution; wherein the engineered Bacillus subtilis bacteria are obtained through genetic modification using Bacillus subtilis as the substrate bacteria, and the live bacteria concentration is ≥1×10¹. 0 The 3% glucose solution (CFU / mL) is a 3% (w / v) aqueous solution of glucose, and the two are mixed at a volume ratio of 1:(800-1200). This invention's compound biological agent combines the soil microecological regulation and root growth promotion capabilities of Bacillus subtilis engineered live bacteria with the sugar metabolism regulation effects of 3% glucose. The synergistic effect of these two agents significantly promotes beet root growth, increases the activity of beet sugar metabolism enzymes, and increases the accumulation of sucrose and soluble sugars in the tubers. Simultaneously, it improves the rhizosphere soil microecological environment of beet and enhances soil phosphorus activation capacity. This provides an environmentally friendly and efficient biological agent for high-quality and high-yield beet cultivation, and has promising agricultural application prospects.

The invention provides a preparation method, a product and application of a Fe3O4 / C composite material, and belongs to the technical field of catalysts. The preparation method of the Fe3O4 / C composite material comprises the following steps: carrying out hydrothermal reaction 1 on FeCl3. 6H2O, trisodium citrate and sodium acetate in ethylene glycol to obtain Fe3O4; and uniformly mixing the Fe3O4 and a glucose solution, and carrying out a hydrothermal reaction 2 to obtain the Fe3O4 / C composite material. By utilizing the synergistic effect of sodium citrate and sodium acetate, the invention provides a low-cost preparation method of a high-purity Fe3O4 nano material, and develops a preparation method of a Fe3O4 / C composite material taking glucose as a carbon source. Then glucose is used as a carbon source, a hydrothermal method is adopted to obtain the Fe3O4 / C micro-nano composite material, and the Fe3O4 / C micro-nano composite material has a remarkable promoting effect on biomass microwave pyrolysis.

The invention discloses a method for preparing a bacillus subtilis SL-KC3 fermentation product and application, and relates to the technical field of microorganisms, and the method comprises the following steps: culturing bacillus subtilis SL-KC3 with NA liquid to obtain bacillus subtilis SL-KC3 bacterial liquid; the preparation method comprises the following steps: mixing bran, soybean meal and water, performing steam fumigation, cooling, adding a bacillus subtilis SL-KC3 bacterial solution, uniformly mixing, and spreading in a tray; placing in a constant-temperature incubator for shallow fermentation, after fermentation for 18 hours, uniformly spraying a glucose solution on the surface layer of the culture medium, and turning over the material; after 24 hours and 36 hours, uniformly spraying water on the surface layer of the culture medium and turning over the material; after 48 hours, turning over the materials, adjusting the temperature of the culture room, and continuing to ferment until the end; after fermentation, drying and crushing are performed to obtain a bacillus subtilis SL-KC3 fermentation product; the prepared fermented feed raw material can be used for preparing a protein raw material with high small peptide content and high digestibility, and the digestibility of the protein raw material is improved.

The application discloses a preparation method of a palladium-nickel composite catalyst, and the preparation process comprises the following steps: putting 15 mL of a glucose solution with a concentration of 0.1-2.1 mol / L, 0.1-1.1 mL of an ionic liquid and 0.05-0.25 g of Ni2O3 into a high-pressure reaction kettle, and then hydrothermally treating the mixture at 140-200 DEG C for 4-14 h; after that, the obtained sample is washed, dried and calcined at 200-500 DEG C under air to obtain a precursor; 15 mg of the obtained precursor and 15 mg of PdO·H2O are put into a 5 mL centrifuge tube, distilled water is added, and ultrasonic treatment is carried out for 50-90 min to obtain a uniformly dispersed suspension; the suspension is heated in the high-pressure reaction kettle at 120-220 DEG C for 1-5 h, then filtration is carried out, and the obtained solid substance is dried at 60-90 DEG C to obtain the palladium-nickel composite catalyst. The prepared palladium-nickel composite catalyst is used for modifying a glassy carbon electrode, and performance test shows that the catalyst has excellent catalytic performance on ethanol electro-oxidation and has potential commercial application value.

The invention discloses a porous ceramic substrate, a preparation method of the porous ceramic substrate and application of the porous ceramic substrate in a gas sensor. The method comprises the following steps: placing a ceramic chip in a glucose solution for dipping, airing and annealing; putting the ceramic wafer into a chloroplatinic acid aqueous solution, dipping, taking out, airing, putting into a sodium borohydride ice aqueous solution, taking out, and airing; and dipping the ceramic chip into the Nafion solution, or spraying the prepared Nafion solution on the surface of the ceramic chip, and then drying to obtain the porous ceramic substrate. The porous ceramic is introduced, the catalyst is implanted into the porous ceramic, the catalytic performance of the catalyst is improved by utilizing the pores and high specific surface area of the porous ceramic, the dosage of the Pt-C catalyst is reduced, the gas phase reaction of the sensor is converted from the Nafion surface to the bulk phase reaction, and the response of the sensor is improved.

The present invention discloses a fluorescent nanomaterial, a preparation method thereof and an application thereof. The method includes: obtaining calcium sulfide nanoparticles doped with rare earth ions; dispersing the calcium sulfide nanoparticles doped with rare earth ions in cyclohexane, adding polyoxyethylene nonyl phenyl ether, concentrated ammonia water and tetraethoxysilane, centrifuging after the reaction ends to obtain calcium sulfide nanoparticles doped with rare earth ions coated with silica; mixing the calcium sulfide nanoparticles doped with rare earth ions coated with silica and an amino-modified silicon source in ethanol to obtain calcium sulfide nanoparticles doped with rare earth ions coated with amino-modified silica; activating the carboxyl group of glucose oxidase, and then adding the calcium sulfide nanoparticles doped with rare earth ions coated with amino-modified silica to react to obtain the fluorescent nanomaterial. The fluorescent nanomaterial has near-infrared second-region (NIR-II) fluorescence performance and can decompose in a glucose solution to release calcium ions and hydrogen sulfide.