58results about How to "Good acid and alkali stability" patented technology

A water-soluble cleaning agent composition comprises an alkaline compound, polyoxyethylene laurylether phosphate salt, lauric acid diethanolamide, lower alcohol and water; taking the total weight of the composition as benchmark, the content of the alkaline compound is 0.01-5 percent by weight, the content of the polyoxyethylene laurylether phosphate salt is 0.01-5 percent by weight, the content of the lauric acid diethanolamide is 0.01-5 percent by weight, the content of the lower alcohol is 0.1-40 percent by weight, and the rest is the water. The cleaning agent composition is easy to be dissolved in a water-organic matter system, can be dissolved in water by any proportion and has strong oil-removing and cleaning ability at normal temperature without causing residual surfactant on the surface of the cleaned object.

The invention relates to MOFs (Metal-Organic Frameworks) with ph stability. The chemical formula of the MOFs is {[Zn2.5(nbta)(trz)2(H2O)].3H2O}n, wherein the nbta is 5-nitro-1,2,3-benzene tricarboxylic acid radical ions, and trz is 1H-1,2,4-triazole; the preparation method comprises the following steps: adding zinc nitrate, the 5-nitro-1,2,3-benzene tricarboxylic acid radical ions and the 1H-1,2,4-triazole into a water solution, using anhydrous sodium carbonate to regulate the PH value, reacting for 72 h at the temperature of 80 DEG C, conducting filtration and washing, and obtaining the target product; the MOFs can be used for selective adsorption separation of the CO2/N2. The MOFs have the advantages that the preparation technology of the MOFs is simple, the operation is easy, the cost is low, the period is short, the productivity is high, the prepared MOFs have better ph stability and further have better selective adsorption separation performance on the CO2/N2.

The invention relates to a photo-responsive titania nanotube-supported catalyst electrode and a preparation method thereof, and belongs to a catalytic electrode material and preparation thereof in a fuel cell. A titania nanotube is adopted as a catalyst carrier of at least one noble metal in platinum, palladium, gold and silver; a photo-responsive semiconductor electrode is obtained by graphene modification, so that, on one hand, a titania nanotube array has good acidic and basic stability and excellent photoelectric property, and on the other hand, the electrical conductivity and the visible light response performance of the semiconductor electrode are enhanced by modification on the titania nanotube by graphene. By the preparation method provided by the invention, the dispersity of the catalyst and the visible light response of the electrode can be improved by the catalyst electrode, so that the catalysis efficiency of the noble metal catalyst is improved.

The invention discloses an extraction composition, an extraction system, an extraction method and a back extraction method. The extraction composition comprises an extraction agent and a neutral phosphorus-oxygen compound, and the extraction agent comprises N,N-di-(2-ethylhexyl) acetamide and N,N-di-(2-ethylhexyl) propanamide. The extraction composition provided by the invention is good in pH stability, low in water solubility, density and viscosity, free of complex extraction operation, small in corrosion to equipment and suitable for the industrial operating requirements.

The invention discloses an enzyme-labeled immunoassay kit which comprises an antibody pre-coating reaction plate, an enzyme-labeled antibody and luminous substrate liquid, wherein the enzyme-labeled antibody takes SBP (soybean protease) as marker enzyme; the luminous substrate liquid comprises H2O2, luminol and an enhancer; the enhancer consists of MORPH (4-marlene pyridine) and SPTZ (3-(10'-phenothiazinyl) propyl-1-sulfonate). According to the enzyme-labeled immunoassay kit, the SBP is introduced to serve as the marker enzyme; on one hand, the thermal stability of the enzyme is higher than that of HRP (hypothalamic regulatory peptide), and the enzyme has the advantages of wide substrate working range, high heat resistance, high acid-alkaline stability, wide pH application range and the like; on the other hand, when the enhancers MORPH and SPTZ are used for enhancing chemical illumination, a chemical luminous signal is enhanced by nearly 100 times, and the detection sensitivity is greatly improved.

The invention discloses a Trichoderma atroviride strain capable of producing high-temperature-resistant feruloyl esterase and high-temperature-resistant cellulase and application thereof. The collection number of the Trichoderma atroviride AWS26 strain is CGMCC No.8673. The Trichoderma atroviride strain has the advantages of low nutritional requirements, high reproduction speed and short fermentation period, and the fermentation products can be easily extracted and separated. The Trichoderma atroviride strain can be fermented to obtain the feruloyl esterase-cellulase composite enzyme. The composite enzyme has the advantages of high temperature resistance and high acid/alkali stability.

The invention discloses a method for preparing a titanium dioxide doped platinum catalyst. The method comprises the following steps: preparing a platinum ion alcohol solution, namely, preparing the platinum ion alcohol solution from polyvinylpyrrolidone as an additive, performing a sealed reaction for 4-8 hours, and naturally cooling to the room temperature so as to obtain a reaction alcohol solution; putting the reaction alcohol solution into a vacuum distillation device, performing vacuum distillation for 2-8 hours so as to obtain a concentrated solution; slowly putting distilled water intothe concentrated solution, uniformly stirring till stable suspended precipitate is formed, and filtering so as to obtain nano platinum granules; stirring nano titanium dioxide, putting into the nano platinum granules, putting into deionized water, performing ball-milling, and performing a stirring reaction for 2-5 hours under radiation of an ultraviolet lamp so as to obtain a suspension; filteringthe suspension so as to obtain precipitate, and sequentially washing the precipitate with absolute ethyl alcohol, methanol and deionized water, thereby obtaining the titanium dioxide doped platinum catalyst. The catalyst prepared by using the method is good in acid-alkali stability and excellent in photoelectric property, and the catalysis efficiency of a noble metal catalyst is improved.

The invention relates to a streptomyces antibioticus and application thereof in preparation of a trypsin inhibitor. The streptomyces antibioticus FY57 is preserved in China General Microbiological Culture Collection Center with a preservation number of CGMCC M.12560. The method provided by the invention has the advantages of low cost, simple operation, good stability, and environmental friendliness, etc. The produced trypsin inhibitor has the characteristics of acid-alkali stability, good thermal stability and storage stability, and high vitality, etc.

The invention provides a method for preparing carbon-based nanoparticles. The method comprises the steps of: (1) carbonizing leaves of a deciduous tree to obtain a carbon source; (2) adding an oxidizing agent into the carbon source so as to perform an oxidation reaction, and then performing centrifugal separation to obtain a supernatant; (3) filtering the supernatant, and collecting the filtrate;and (4) drying the filtrate to obtain the carbon-based nanoparticles. The invention also provides the carbon-based nanoparticles prepared by the method and application of the carbon-based nanoparticles in biological analysis.

The invention relates to a preparation method of a natural compound sweetener, and belongs to the technical filed of food additives. The preparation method of the natural compound sweetener comprises the following steps: adopting fructus momordicae and stevia as the raw materials; carrying out crude extraction by using an ethanol method so as to obtain mogroside and stevioside; compounding the selenium in the crude extract of the fructus momordicae with the vitamins and the like in the crude extract of the stevia; and then, carrying out compounding with pomegranate fruit juice powder, and carrying out grinding and mixing, so that the natural compound sweetener is prepared. The natural compound sweetener prepared by the preparation method has the characteristics that the sweetener is non-toxic, low in calorie, and high in sweetness; moreover, the sweetener is rich in selenium and vitamins, capable of promoting nutrient absorption, and refreshing in taste. The prepared sweetener is relatively stable to acid and alkali, so that the sweetener can be widely used in various kinds of foods instead of sucrose; and the sweetener can be used as substitute sugar for the patients with obesity and diabetes. The sweetener is low in cost, and has wide application prospects.

The invention belongs to the technical field of deep processing of foods and particularly relates to an acetylcholine esterase inhibiting peptide extracted from walnut meal as well as a preparation method and application of the acetylcholine esterase inhibiting peptide. An amino acid sequence of the acetylcholine esterase inhibiting peptide from an N terminal to a C terminal is as follows: Tyr-Val-Pro-His-Trp (YVPHW), Phe-Tyr-Arg-Arg (FYRR) or Leu-Ala-Pro-Phe (LAPF), and a half inhibitory concentration IC50 of the acetylcholine esterase inhibiting peptide is 139.10+/-1.34 micrograms per millimeter, 304.20+/-2.57 micrograms per millimeter and 318.80+/-1.98 micrograms per millimeter separately. The oligopeptidase provided by the invention is obvious in inhibiting effect, the walnut meal is adopted as a raw material, the production cost is low, and the economic benefit is high. According to the invention, a double-nano emulsion loaded with an oligopeptide YVPHW is also prepared by a two-step emulsification method, and the encapsulation efficiency can reach 92.65%+/-0.77%. The double-nano emulsion is relatively uniform in distribution and relatively good in environmental stability, the defect that the oligopeptide YVPHW is quickly digested in gastrointestinal tracts can be overcome, a slow release effect is achieved, and a theoretical basis for deep processing of the walnut meal is provided.

The invention relates to the technical field of anti-corrosion coating materials, in particular to a modified graphene anti-corrosion coating and a preparation method and application thereof. The preparation method comprises the following steps of: blending acrylic resin and tannic acid to obtain paint slurry, preparing a graphene oxide@ZrO2 material, reducing the surface of graphene oxide, and enabling reduced amino groups to react with the acrylic resin in the paint slurry, so as to enable graphene oxide@ZrO2 to be stably grafted on the acrylic resin. A corrosion medium is prevented from entering the acrylic resin coating through the graphene oxide@ZrO2 material, so that the acrylic resin is protected. The acrylic resin is adopted as the anti-corrosion coating, chloride ions are effectively prevented from damaging a metal oxide film protection layer, and pitting corrosion or pit corrosion is effectively avoided. Tannic acid and iron ions on the surface of a steel structure are subjected to rapid reaction, so that tannic acid and iron ions are chelated, then paint paste with physical and chemical dual protection effects is formed, and the modified graphene anti-corrosion coating with excellent anti-corrosion performance is obtained.

The invention discloses an antibacterial kitchen detergent, which comprises the following raw materials: sodium linear alkylbenzene sulfonate (LAS), sodium alcohol ether sulphate (AES), cocoanut fattyacid diethanolamide (6501), triclosan, ethanol, sodium chloride, sodium dihydrogen phosphate, sodium thiosulfate, sodium citrate, deionized water, a deodorant and essence. According to the invention,triclosan is supplemented by components such as sodium linear alkylbenzene sulfonate (LAS), sodium alcohol ether sulphate (AES), cocoanut fatty acid diethanolamide (6501), ethanol and the like to design the antibacterial kitchen detergent with dual effects of hard surface washing and antibiosis, and the antibacterial kitchen detergent has the advantages of high detergency, good stability, good antibacterial effect and great safety and efficiency. The detergent has broad-spectrum antibacterial property, solves the problem that the traditional kitchen detergent formula is not environment-friendly, has dual effects of washing and resisting bacteria, and effectively solves the problem of single function of the kitchen detergent product.

The invention discloses an extraction composition, an extraction system, an extraction method and a back extraction method. The extraction composition comprises an extraction agent and a neutral phosphorus-oxygen compound, and the extraction agent comprises N,N-di-(2-ethylhexyl) acetamide and N,N-di-(2-ethylhexyl) propanamide. The extraction composition provided by the invention is good in pH stability, low in water solubility, density and viscosity, free of complex extraction operation, small in corrosion to equipment and suitable for the industrial operating requirements.

The invention relates to nutritional floating bath oil. The nutritional floating bath oil is prepared from the raw materials in percentage by weight: 71.0% of white oil, 1.0% of potassium laureth phosphate, 24.0% of isopropyl myristate and 4.0% of essence. According to the nutritional floating bath oil, the dosage and physicochemical properties of all the raw materials generate a synergetic effect, so that the effects of body cleaning and skin caring are achieved. The nutritional floating bath oil has the pH value close to that of the human skin and is non-irritant to the skin; after the nutritional floating bath oil is used, obvious comfortable and soft feeling is generated, and no greasy feeling is generated, so that the nutritional floating bath oil has obvious effects on cleaning and nourishing the skin.