556 results about "Gluconic acid" patented technology

A forest fire retardant composition contains a retardant compound that includes a potassium salt. The potassium salt may include a potassium salt of an organic acid, a potassium salt of an inorganic acid, or mixtures thereof. The organic acid may include formic acid, acetic acid, propanoic acid, butanoic acid, lactic acid, oxalic acid, malic acid, gluconic acid, tartaric acid, uric acid, malic acid, or citric acid. The inorganic acid may include sulfuric acid, phosphoric acid, carbonic acid, or hydrochloric acid. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

The invention provides a protein. The protein comprises an amino acid sequence as shown in SEQ ID NO: 1 or SEQ ID NO: 3. Corresponding nucleic acids, vectors, and compositions comprising the proteins are also provided. In some embodiments, the composition comprises recombinant collagen with an amino acid sequence as shown in SEQ ID NO: 1 or 3, gamma-aminobutyric acid, calcium gluconate, zinc gluconate, vitamin, oryzanol, recombinant humanized collagen with an amino acid sequence as shown in SEQ ID NO: 4 and cordyceps sinensis powder. The invention also provides application of the protein and the composition in preparation of products for helping sleep or relieving depression.

The invention relates to a solid beverage containing mulberry leaf and emblic leafflower fruit components. The solid beverage comprises the following components: a mulberry leaf-emblic leafflower fruit fermentation extract, collagen tripeptide, fructo-oligosaccharide, vitamin C, zinc gluconate, vitamin E, vitamin B6 and vitamin B2. The solid beverage disclosed by the invention contains components such as mulberry leaf and phyllanthus emblica collagen tripeptide, and particularly contains a mulberry leaf and phyllanthus emblica mixed fermentation extract obtained by an original fermentation process, so that contained anti-sugar and anti-oxidation components are stimulated, the generation of free sugar can be greatly inhibited, and oxygen free radicals can be eliminated; the product can be used as a whitening food for alleviating the problems of dull yellow facial skin, coarse pores and the like caused by high-sugar diet, so that the skin is whitened and fine.

The invention provides a carbon ceramic resistor and a preparation method thereof, and relates to the technical field of special material production of power systems and electrical equipment. The preparation method comprises the steps that carbon-containing electric conductor raw materials are mixed to obtain a first mixed raw material, and the carbon-containing electric conductor raw materials comprise, by mass, 15 parts of gluconic acid, 10 parts of aluminum oxide and 55 parts of deionized water; performing hydrothermal reaction on the first mixed raw material to obtain a carbon-containing conductor precursor; the carbon-containing conductor precursor is carbonized in a protective atmosphere, a carbon-containing conductor of a core-shell structure is obtained, and the carbon-containing conductor takes aluminum oxide as an inner core and takes a conductive carbon material formed by gluconic acid as a conductive outer shell; mixing the carbon-containing electric conductor with the core-shell structure with a carbon ceramic matrix raw material to obtain a resistor blank; and sintering the resistor blank to obtain the carbon ceramic resistor. The uniformity, the stability and the reliability of the carbon ceramic resistor are improved, so that the carbon ceramic resistor can better meet the application requirements of ultrahigh-voltage and extra-high-voltage alternating-current power transmission systems.

The invention relates to the technical field of composite material preparation, in particular to high-mechanical-property granular hydrogel and a preparation method and application thereof.The high-mechanical-property granular hydrogel is prepared by mixing gelatin nano-particles, calcium carbonate nano-particles, ferric oxide nano-particles and a sodium alginate solution under the alkaline condition, then adding gluconic acid-delta-lactone, and conducting stirring, standing and drying to obtain the high-mechanical-property granular hydrogel. Particle hydrogel with high mechanical property is prepared and is simply recorded as Ca-Alg / MCG, and the gel system is endowed with the catheter injectable property, the blood vessel deliverable property and the intravascular hardenability property. The hydrogel can be delivered to small blood vessels of tumors, the mechanical property can be gradually enhanced along with the change of time, and the embolism effect of the granular hydrogel in the blood vessels is further improved. Meanwhile, the magnetic nanoparticles endow the hydrogel with the magnetic-thermal response capability, the temperature can be rapidly increased under an alternating magnetic field, tumor cells are further killed, and the hydrogel shows an excellent embolism effect in a rabbit kidney embolism model and a liver cancer rabbit embolism model.

The invention discloses a preparation method of a mesoporous Zn-ZSM-5 molecular sieve for preparing aromatic hydrocarbon from methanol, and belongs to the technical field of synthesis of inorganic materials. Aiming at the problems that a conventional mesoporous Zn / ZSM-5 molecular sieve catalyst Zn blocks orifices, the mesoporous structure is disordered, the molecular sieve solid yield is low, a molecular sieve framework is seriously damaged and the like, the preparation method comprises the following steps: uniformly mixing zinc gluconate with an aluminum source, a silicon source and a template agent, putting the mixture into a closed reaction container, carrying out hydrothermal crystallization, and sequentially washing, drying and roasting to obtain the mesoporous Zn / ZSM-5 molecular sieve catalyst. The sodium type molecular sieve is obtained; the preparation method comprises the following steps: carrying out multiple ion exchange on a sodium type molecular sieve by using an ammonium chloride solution, and sequentially carrying out suction filtration, washing, drying and roasting to obtain the mesoporous Zn-ZSM-5 molecular sieve. According to the preparation method of the methanol-to-aromatic hydrocarbon Zn / ZSM-5 molecular sieve provided by the invention, the obtained molecular sieve is used in the methanol-to-aromatic hydrocarbon process, and has the characteristics of high carbon deposition resistance, high aromatic hydrocarbon selectivity, low Zn wastage rate and the like.

The invention discloses a rare earth compound flocculant and a preparation method and application thereof.The rare earth compound flocculant is composed of a gluconic acid rare earth compound, a pyrithione rare earth compound and water, the content of the gluconic acid rare earth compound is 5-15 wt%, and the gluconic acid rare earth compound is prepared by reacting sodium gluconate with first chlorinated rare earth salt in water; the content of the pyrithione rare earth compound is 0.4-0.6 wt%, and the pyrithione rare earth compound is prepared by reacting sodium pyrithione with second chlorinated rare earth salt in water. According to the invention, rare earth ions have positive electricity, and show extremely strong coordination ability and high coordination number. Meanwhile, the surface of phaeodactylum tricornutum has electronegativity; therefore, when the rare earth ions are in contact with the phaeodactylum tricornutum, the rare earth ions and the phaeodactylum tricornutum can rapidly generate charge interaction, so that the phaeodactylum tricornutum is rapidly agglomerated and forms a lump, and then the lump

The invention discloses ZIF-8 loaded M2 macrophage outer vesicle hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: inducing M0 macrophages through IL-4 to obtain M2 type macrophages; collecting cell supernate, and separating by adopting an ultracentrifugation method to obtain the M2 type macrophage extracellular vesicle EV; purifying the obtained M2-type macrophage extracellular vesicle EV, mixing the purified M2-type macrophage extracellular vesicle EV with ZIF-8 nanoparticles, and carrying out electroporation treatment to obtain a ZIF-loaded exosome vesicle ZIF (at) EV; performing ultrasonic stirring and mixing on a sodium alginate solution and calcium carbonate, adding the obtained ZIF-coated EV and D-(+)-gluconic acid delta-lactone, and fully stirring and mixing to obtain the product. The ZIF-EV hydrogel disclosed by the invention is effective in wound healing, and the ZIF-EV hydrogel can continuously release the ZIF-EV on the wound to promote wound healing.

The invention provides a leaching method and a recycling method of metal in a nickel cobalt lithium manganate positive plate. The leaching method comprises the following steps: pre-treating a nickel cobalt lithium manganate positive plate disassembled from a waste battery to obtain positive powder; preparing a gluconic acid leaching agent containing gluconobacter oxydans, and electrolyzing the positive electrode powder at the voltage of 2.0-2.5 V by adopting a double-chamber electrochemical electrolytic tank to obtain a leaching solution containing Li < + >, Ni < 2 + >, Co < 2 + > and Mn < 2 + >. Positive electrode powder, a gluconic acid leaching agent and a ferrous sulfate aqueous solution are put into a cathode chamber of a double-chamber electrochemical electrolytic tank, and an inorganic alkali aqueous solution is contained in an anode chamber of the double-chamber electrochemical electrolytic tank; the leaching efficiency can be improved and the leaching rate is high through the effects of dissolution of gluconic acid, electrolysis for hydrogen release and auxiliary reduction of Fe < 2 + >.

The invention relates to gluconic acid pentazocine benzoate as shown in a formula (I), and a preparation method, a pharmaceutical preparation and medical application thereof. The invention provides application of the compound in preparation of medicines for treating moderate and severe acute and chronic pains, and the compound has the effects of high efficacy and low side effect. # imgabs0 #

The invention provides an acetylated surfactant capable of reducing the minimum miscible pressure of CO2 miscible displacement as well as a preparation method and application of the acetylated surfactant, and belongs to the technical field of CO2 oil displacement. The preparation method of the acetylated surfactant comprises the following steps: reacting a gluconic acid aqueous solution with n-caprylic alcohol under the action of a catalyst A to obtain n-octyl gluconate; under the action of a catalyst B, n-octyl gluconate and acetic anhydride react to obtain the acetylated surfactant for reducing the minimum miscible pressure of CO2 miscible flooding. The preparation method of the surfactant is simple, and the raw materials are cheap, wide in source, green and low in cost; the obtained surfactant can interact with CO2, has high CO2 affinity, and can effectively reduce the minimum miscible pressure of CO2 miscible flooding.

A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.

A detergent building composition, comprising (i) one or more sugar oxidation products; and (ii) at least one performance augmenting additive selected from the group consisting of aluminates, silicic acid, sodium silicate, potassium silicate, monosilicates, carbonates, silanes, siloxanes, amino acids, urea, boric acid, borate derivatives, molybdates, titanates, chelating agents, sugar alcohols, carboxylates, acids, and combination thereof. A detergent building composition, comprising (i) glucaric acid, gluconic acid, salts thereof, lactones thereof or combinations thereof; and (ii) at least one performance augmenting additive selected from the group consisting of aluminates, silicic acid, sodium silicate, potassium silicate, monosilicates, carbonates, silanes, siloxanes, amino acids, urea, boric acid, borate derivatives, molybdates, titanates, chelating agents, sugar alcohols, carboxylates, acids, and combination thereof.

The invention discloses a method for detecting glucose on the basis of cascade catalysis of cerium dioxide / gold nano cluster-Prussian blue nano enzyme (AuNCs-CeO-HMPB). The material is prepared by compounding cerium dioxide (CeO) with similar glucose oxidase activity and hollow Prussian blue nanoparticles (AuNCs-HMPB) modified by gold nanoclusters with similar peroxidase activity through a hydrothermal assembly method. In the presence of glucose, CeO catalyzes oxidation of glucose to generate gluconic acid and H2O2, then AuNCs-HMPB synergistically catalyzes decomposition of newly generated H2O2 to generate high active oxygen species, further a colorless 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) color developing agent is oxidized to generate obvious color change, and based on the cascade catalytic reaction, the enzyme-free glucose colorimetric sensor is successfully constructed. The sensor shows excellent detection performance on glucose under optimized conditions (pH = 4.0, 50 DEG C), the linear detection range is 10.00-90.00 [mu] mol / L, and the detection limit is 2.1 [mu] mol / L (S / N = 3).

The invention belongs to the technical field of medicines, and particularly relates to a composition containing mesenchymal stem cells and application of the composition in preparation of products for resisting premature ovarian failure. The invention relates to a composition containing mesenchymal stem cells. The umbilical cord mesenchymal stem cell gel is prepared from the following components in percentage by weight: 10 percent of umbilical cord mesenchymal stem cells, 4 to 6 percent of human serum albumin stock solution, 1 to 2 percent of ginkgo biloba extract, 1 to 3 percent of coix seed oil, 2 to 2.5 percent of flavonol glycoside, 1.1 to 1.3 percent of vitamin E, 0.4 to 0.8 percent of glutathione, 0.5 to 1.5 percent of sodium hyaluronate, 0.5 to 1.0 percent of phycocyanin, 1.2 to 1.8 percent of zinc gluconate, 0.5 to 0.8 percent of heparin calcium, 0.1 to 0.3 percent of pH regulator and the balance of normal saline. The composition disclosed by the invention can be used for preparing products for resisting premature ovarian failure and has a very good effect.

The invention discloses nutrition powder for promoting growth of bones of children and a preparation method of the nutrition powder. The nutrition powder comprises trehalose, strawberry fruit powder, L-calcium lactate, maltodextrin, gamma-aminobutyric acid, L-lysine, taurine, bone collagen, zinc gluconate, fructo-oligosaccharide, Chinese yam powder, poria cocos powder, stevioside, VD3 dry powder and VA acetate powder. The trehalose is used for providing energy needed by growth of children, the gamma-aminobutyric acid and the zinc gluconate have the function of promoting pituitary to secrete growth hormone, the L-calcium lactate and the vitamin D3 are used for providing a calcium source needed by growth and ensuring absorption, and the bone collagen is used for providing a protein source for bone production. Chinese yam, poria cocos and fructo-oligosaccharide which are homologous in medicine and food improve the gastrointestinal absorption function of children, the whole formula is comprehensive in consideration and reasonable in nutrition matching, the purpose of promoting bone growth of children is effectively achieved, and the food has the advantages of being low in production cost, easy and convenient to operate, safe to eat and scientific and reasonable in process.

The invention is suitable for the technical field of chemical synthesis, and provides a nitrogen modified metal composite material and a preparation method and application thereof. According to the method, primary biomass and derivatives thereof are carbonized in ethylene glycol containing a nitrogen precursor, meanwhile, bimetal is reduced and loaded on a nitrogen modified functional carbon carrier, so that an alloy catalytic site is formed, and the alloy catalytic site is beneficial to adsorption of monosaccharide, promotion of mass transfer of substances and promotion of monosaccharide oxidation into a final product saccharic acid; therefore, the monosaccharide oxidation reaction is efficiently carried out, and a theoretical basis is provided for directly synthesizing saccharic acid from agricultural wastes such as straw through chemical catalytic oxidation. The monosaccharide comprises xylose, glucose and the like; the product saccharic acid comprises xylonic acid, gluconic acid, glucaric acid and the like. Results show that the conversion rate of glucose is 100%, the yield of gluconic acid is 81.7%, and the yield of glucaric acid is 13.1%.

A smoothing hair treatment composition, comprising: 6.0 to 10% by weight of a fiber active comprising a combination of citric acid and gluconic acid, based on the total weight of the smoothing hair composition; 10 to 20% by weight of a polyelectrolyte complex, based on the total weight of the smoothing hair composition; a surfactant selected from an anionic surfactant and a cationic surfactant; and a preservative; wherein the smoothing hair treatment composition is a leave-on treatment composition.

The invention belongs to the technical field of medicines, and provides a calcium zinc gluconate oral solution and a preparation method thereof. According to the invention, the sugar alcohol chelating agent is added into the calcium zinc gluconate oral solution, so that the effects of chelating and surface activity can be exerted at the same time, and the higher absorption and mobility of sugar alcohol can be utilized to drive calcium and zinc elements to be better absorbed. Preferably, sorbitol can form a sorbitol calcium ion chelate and a sorbitol zinc ion chelate with calcium ions in calcium gluconate and zinc ions in zinc gluconate, so that the stability and water solubility of the sorbitol calcium ion chelate and the sorbitol zinc ion chelate are improved, and precipitation of grape calcium carbonate and zinc gluconate is avoided; further, the solubility and the stability of the calcium gluconate and the zinc gluconate in the solution are improved. In addition, after the sorbitol is added, the low-temperature (2-8 DEG C) precipitation of the calcium gluconate is greatly improved. In addition, sorbitol has a fresh and sweet taste, so that the calcium zinc gluconate oral liquid has a good taste.

The invention relates to the technical field of crystallization and purification, in particular to a glucolactone crystallization method. The method comprises the following steps: sequentially carrying out four-stage cooling crystallization on a raw material containing gluconic acid, wherein each stage of cooling crystallization comprises gradient cooling independently carried out in four temperature zones. According to the method provided by the invention, glucolactone crystals with regular and uniform particles, narrow particle size distribution range and high purity can be obtained, the yield is obviously higher than that of a conventional one-time crystallization method, especially when centrifugal separation is carried out, the separation effect is good, the water content of the separated material is low, the addition of crystal washing water in the separation process is less, and the mother liquor generation amount is less; and the production cost is greatly reduced.

The invention relates to the technical field of polyphenol extraction, and provides a green pear polyphenol extraction method which comprises the following steps: performing steam explosion treatment on pear residue dry powder, and then infiltrating and activating by using an aqueous solution containing L-malic acid; adding betaine and D-gluconic acid into the first part of ultrapure water to prepare a deep eutectic solvent; mixing the eutectic solvent with a second part of ultrapure water to prepare a composite extracting agent; putting the infiltrated and activated raw materials and a composite extracting agent into an extraction device to obtain an extracting solution; carrying out solid-liquid separation on the extracting solution to obtain a clear solution; and adsorbing the clarified liquid through macroporous adsorption resin, then eluting with an ethanol water solution, collecting polyphenol-rich eluent, and carrying out spray drying to obtain the pear polyphenol extract. According to the technical scheme, the quality of an extracted product is improved, and polyphenol oxidation and thermal degradation are reduced; meanwhile, the product storage stability is improved, the phenomena of wall sticking and caking of powder are reduced, and the product yield and physical properties are guaranteed.

The invention provides a capillary crystalline type waterproof agent and a preparation method thereof and a concrete material, the capillary crystalline type waterproof agent comprises a complexing agent, an active silicon component, modified silicon dioxide and a solvent, the complexing agent comprises polyvinyl alcohol grafted gluconic acid, the modified silicon dioxide comprises silane coupling agent grafted silicon dioxide, and the solvent is a solvent. The silane coupling agent contains an epoxy group. According to the invention, deep penetration, uniform distribution and long-term stable impermeability of the waterproof agent can be considered and optimized.

The invention discloses a method for constructing an antibacterial osteogenic coating on the surface of a titanium-based material, which comprises the following steps: S1, after surface alkali modification of the titanium-based material, soaking the titanium-based material in a buffer solution containing polyethyleneimine and dopamine, taking out the titanium-based material, and airing the titanium-based material; s2, soaking the titanium-based material treated in the step S1 in a polyacrylic acid solution, then cleaning the titanium-based material with deionized water, soaking the titanium-based material in a chitosan quaternary ammonium salt solution, and then cleaning the titanium-based material with deionized water again; s3, the step S2 is repeated, the obtained titanium-based material is soaked in a polyacrylic acid solution and then cleaned with deionized water, the titanium-based material is aired at the room temperature after being cleaned, and a chitosan quaternary ammonium salt / polyacrylic acid coating is formed on the surface of the titanium-based material; and S4, the titanium-based material treated in the step S3 is soaked in a zinc gluconate solution, washed with deionized water after soaking and aired at the room temperature. The antibacterial rates of the coating on staphylococcus aureus and porphyromonas gingivalis are both greater than 95%, and the coating has excellent biocompatibility and osteogenic activity.

The invention discloses a lithium iron phosphate positive plate recovery method suitable for a decommissioned lithium ion power battery, which comprises the following steps: S1, safely disassembling the decommissioned lithium iron phosphate power battery to obtain a positive plate; s2, soaking the positive plate in an eluent at a constant temperature of 65-95 DEG C, taking out the current collector after an active substance is separated from the current collector, and filtering to obtain the active substance; s3, cleaning and drying the active substance and the current collector obtained in the step S2; the eluent is formed by dissolving an acidic chelating agent and a passivating agent in water, the acidic chelating agent comprises one or more of gluconic acid, nitrilotriacetic acid, ethylenediamine tetraacetic acid and pentetic acid, and the passivating agent is used as an additive and comprises one or more of sodium phytate, sodium acetate, sodium citrate, sodium oxalate and sodium phosphate. According to the invention, the retired lithium iron phosphate battery is recovered at low cost by using a low-energy-consumption, safer, green and environment-friendly efficient method, and a high-purity and more complete positive active material and current collector are obtained.

The invention relates to a hydrogel light-operated multi-mode synergistic treatment platform based on a CuxS-MoS2 heterojunction for promoting wound healing of diabetes mellitus. And an interface induced electric field strategy is provided through density functional theory (DFT) calculation to optimize the charge migration behavior of the phototherapy agent. The multifunctional phototherapy system is constructed by taking CuxS-MoS2 with a built-in electric field as a core and PVA-CS hydrogel loaded with glucose oxidase (GOx) as a bracket. In a weakly acidic wound microenvironment, glucose at the wound is catalyzed by GOx to be converted into H2O2 and gluconic acid; meanwhile, the CuxS-MoS2 remarkably enhances the generation of reactive oxygen species (ROS) under illumination through peroxidase-like (POD) activity, photothermal effect (PTT) and heterojunction efficient carrier separation. After entering a proliferation period, the stent exerts catalase-like (CAT) activity to remove excessive ROS and release oxygen, and oxygen deficit and oxidative stress are relieved. In addition, the controllably released copper ions regulate and control the behavior of fibroblasts, promote healing and inhibit fibrosis. Experiments prove that the stent has excellent biocompatibility, effective antibacterial property and remarkable healing promoting effect in chronic wound repair of diabetes mellitus.

An alditol oxidase and application thereof. The method uses D-glucose as a substrate to dock the alditol oxidase derived from Streptomyces coelicolor A3, and selects amino acid residues around an active center for saturation mutagenesis, and screens for alditol oxidase with D-glucose oxidizing activity by plate color development. An amino acid sequence of the alditol oxidase is shown in SEQ ID NO: 2 or SEQ ID NO: 4. The alditol oxidase has the activity of converting D-glucose to D-gluconic acid and D-glyceraldehyde to D-glyceric acid. By using the alditol oxidase, the conversion of D-glucose to pyruvic acid is realized by only three enzymes for the first time and does not depend on any coenzyme.

The invention relates to the technical field of molybdenum powder preparation, in particular to superfine molybdenum powder and a preparation method thereof.The preparation method comprises the steps that ammonium molybdate is subjected to ball milling and sieving to obtain ammonium molybdate powder, and the ammonium molybdate powder and a gluconic acid solution are mixed, stirred and dissolved to obtain a suspension solution; adding an azeotropic solution of n-butyl alcohol and water into the suspension solution, heating, stirring and dissolving to obtain a mixed solution; distilling the mixed solution, and cooling after the mixed solution is evaporated to obtain a solid ammonium molybdate precursor; the preparation method comprises the following steps: dispersing an ammonium molybdate precursor in an azeotropic solution, heating and roasting the ammonium molybdate precursor in air to obtain MoO3, carrying out first-stage reduction on the MoO3 in a hydrogen atmosphere to obtain MoO2, and then carrying out second-stage reduction to obtain the super molybdenum powder. And meanwhile, by regulating and controlling the mixing ratio of ammonium molybdate and the azeotropic solution, the morphology and size of the molybdenum powder can be remarkably adjusted, so that the molybdenum powder which is single and regular in morphology, uniform in distribution, high in yield, simple in preparation process and capable of being rapidly produced on a large scale is prepared.

The invention relates to an activated carbon electrode material for a supercapacitor and a preparation process thereof, and belongs to the technical field of activated carbon electrode materials. The preparation process provided by the invention specifically comprises the following steps: mixing cane sugar, ammonium dihydrogen phosphate, deionized water and zinc gluconate, carrying out spray drying at 80 DEG C to obtain precursor powder with a loose structure, carbonizing, then carrying out pulse activation, water vapor reaming, cooling and post-treatment, mixing the obtained composite material with carbon nanofibers, a PTFE binder and absolute ethyl alcohol, and carrying out ball milling, so as to obtain the carbon nanofiber composite material. And coating the obtained slurry with an aluminum foil, drying, rolling, and carrying out hot press molding, thereby obtaining the product. According to the invention, cane sugar is used as a carbon source, zinc gluconate is introduced to assist in forming a honeycomb-shaped pore frame, and a honeycomb-shaped porous structure is formed along with further increase of carbonization temperature and multiple cyclic pulse activation and water vapor chambering processes, so that the ion transmission efficiency is improved, and the loss of a specific capacitance value under high current density is reduced; the capacitance performance of the material is improved.

The invention belongs to the technical field of microorganisms, and particularly relates to lactobacillus helveticus YM1922 for promoting brain development, improving concentration and nourishing nerves as well as a metabolite, a complex flora, a metabolite and application. The lactobacillus helveticus YM1922 is preserved in the China General Microbiological Culture Collection Center on September 10, 2024, and the preservation number of the lactobacillus helveticus YM1922 is CGMCC No. 31928. Fermentation metabolites of the strain can promote secretion of brain-derived neurotrophic factors, and thalli can inhibit production of intestinal tract D-gluconic acid in intestinal tracts. Therefore, the strain and the metabolite thereof have application potentials of promoting brain development, improving cognitive level, improving concentration and nourishing nerves, and can be prepared into products for playing corresponding roles.

The invention belongs to the technical field of silicon material cleaning, and particularly relates to a silicon material cleaning agent and a preparation method and application thereof. The silicon material cleaning agent provided by the invention comprises the following components in parts by mass: 50-60 parts of water; 15 to 30 parts of an acidic etching solution; 10 to 20 parts of a first chelating agent; 10 to 20 parts of a second chelating agent; 0.5 to 5 parts of a surfactant; 5 to 15 parts of a builder; wherein the first chelating agent is selected from at least one of 1-hydroxyethylidene-1, 1-diphosphonic acid or ethylenediaminetetraacetic acid; the second chelating agent is selected from at least one of citric acid, gluconic acid, tartaric acid, malic acid, sodium citrate, sodium gluconate, potassium pyrophosphate and sodium pyrophosphate. The silicon material cleaning agent is used for silicon material cleaning, various metal ions can be cleaned at a time, the silicon material cleaning efficiency is improved, and the industrial cost is effectively reduced.