351 results about "Ph stability" patented technology

The present invention provides an ionic compound which: can exert excellent basic performance such as excellent electrochemical stability including an excellent ionic conductivity; is excellent in pH stability; and can suitably find use in a variety of applications, and an electrolyte material, an electrolytic solution, and an electrolytic capacitor each containing the ionic compound. Anionic compound of the present invention has an anion represented by a general formula (1) and a cation represented by a general formula (2):

• where X represents an element selected from B, C, N, O, Al, Si, P, S, As, and Se, M¹ and M² represent linking groups, Q represents a monovalent element or organic group, a represents an integer of 1 or more, and b, c, d, and e each represent an integer of 0 or more;

R_s-LH^⊕  (2)

where L represents an element selected from C, Si, N, P, S, and O, R represents a monovalent element, functional group, or organic group, and s represents an integer of 2, 3, or 4.

An advanced silica gel sorbent for use in chromatographic separations that has been chemically modified by surface polycondensation of a trifunctional and/or difunctional organosilane. The chromatographic media exhibits a wider pH range and improved pH stability as compared to other silica gel based sorbents, while retaining all other positive aspects attributed to silica gel based sorbents. A method of forming the advanced silica gel sorbent by Templated Multilayer Inorganic/Organic Grafting.

A material for chromatographic separations, processes for its preparation, and separation devices containing the chromatographic material. In particular, porous inorganic/organic hybrid monoliths are provided with a decreased concentration of surface organic groups, and have improved pH stability, improved chromatographic separation performance, and improved packed bed stability. These monoliths may be surface modified resulting in higher bonded phase surface concentrations and have enhanced stability at low pH.

The present invention is directed to a cleaning composition comprising: (a) an enzyme in an amount effective to promote cleaning; (b) viable microorganisms in an amount effective to degrade and promote the degradation of organic materials; (c) a surfactant; and (d) an aqueous carrier; said cleaning composition maintaining at least 95% enzymatic activity at a pH range of from about 5.5 to about 13.5.

The present disclosure provides a method for culturing cells in exogenous lactic acid. Certain aspects of the present disclosure include the production of recombinant proteins, such as antibodies and fragments thereof. Certain aspects of the present disclosure also relate to methods of controlling lactic acid production, pH stability and osmolality in cell culture.

The invention relates to the genetic engineering field, especially to a strain Bispora sp.MEY-1 which produces an acidophilic beta-mannanase and the acidophilic beta-mannanase MAN5A got from the strain having an amino acid sequence shown as SEQ ID NO.1 or 2, a gene man5A for coding said beta-mannanase having a nucleotide sequence shown as SEQ ID NO.1 or 2, and a recombinant vector containing said gene and applications. The beta-mannanase of the invention has the following advantages: the optimum pH 1.0-1.5, the optimum temperature 65 DEG C, good pH stability and thermostability, high specific activity, good protease resistance and easy for industrial fermentation production. The product of the invention can be widely used for the animal feeding-stuffs, the food, the medicament, the brewing and the energy industry as a novel enzyme preparation.

The invention relates to continuous ink jet printing of an aqueous pigmented ink composition recycled from a main ink supply reservoir, employing a printer with a fluid delivery system capable of measuring the ink electrical resistivity, and providing needed quantities of either vehicle replenisher fluid or fresh ink to maintain the desired recycled ink concentration. The electrical resistivity of the pigmented ink can be modified advantageously for stable ink recycling by the addition of the organic amine salt of an acid, and the pH stability of the ink can be simultaneously improved by the additional inclusion of the neutral form of the organic amine in similar molar proportions to the amine salt. The pigmented ink jet ink compositions provide for particularly stable and invariant fluid properties during periods of extended printer operation and ink recirculation.

The invention discloses a preparation method of a high-solid content waterborne polyurethane emulsion, comprising the following steps: (A) reacting polymer polyhydric alcohol with diisocyanate, then adding a catalyst and a diluting solvent, reacting to obtain a polyurethane prepolymer; (B) adding the diluting solvent to the polyurethane prepolymer to obtain the diluted polyurethane prepolymer; (C) preparing a mixed water solution of small molecule amines and a sulphonate type hydrophilic chain-extending agent; (D) dropwise adding the mixed water solution of small molecule amines and the sulphonate type hydrophilic chain-extending agent to the diluted polyurethane prepolymer, then insulating; (E) adding the diluting solvent to the product of the step (D) at room temperature and mixing; and (F) adding water to the product of the step (E), emulsifying and dispersing to obtain the polyurethane emulsion, and removing the diluting solvent to obtain the high-solid content waterborne polyurethane emulsion. The high-solid content waterborne polyurethane emulsion has better storage stability, better hydrolysis resistance, better pH stability, high utilization rate of equipment and low transportation and drying costs.

The invention discloses a post processing method for the dyeing of all-cotton knitted fabrics that applies an immobilized laccase, belongs to the technical field of the application of the dyeing and finishing treatment of the knitted fabrics in the printing and dyeing industry, and aims at solving the technical problems that traditional post processing of the knitted fabric dyeing has high soaping temperature, large water consumption and residual washing water with deep chromaticity and achieving the goal for optimizing the post processing effect of the dyeing. The post processing method of the invention adopts calcium alginate and gelatinum as carriers so as to implement the imbedding of the laccase, improves the immobilization efficiency of the laccase in the carriers through glutaraldehyde crosslinking, improves the heat and pH stability of the laccase in the carriers by adding polyethyleneglycol, and realizes the circulation of the immobilized laccase in the post enzyme-washing treatment of the dyeing of the all-cotton knitted fabrics by adding carmowax to improve the thermal stability and the pH stability of the laccase in the carriers. By adopting the post processing method of the invention, the enzyme-washing technique with the immobilized laccase can replace traditional chemical soaping techniques, can not only effectively remove superficial loose color of the dyed all-cotton knitted fabrics and improve the wet processing fastness of the fabrics, but also effectively lower the chromaticity of the post processing residual liquid and release the burden of the sewage treatment of the printing and dyeing, and the post processing method of the invention is favorable for protecting ecological environment.

The invention provides a fluorine-containing waterproofing agent for textiles and a method for preparing the same, belonging to the chemical material field. A self-emulsifying fluorine-containing acrylate block copolymer is synthesized by means of ARGETATRP (Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization); and the self-emulsifying fluorine-containing acrylate block copolymer can be directly used after being emulsified and diluted. The self-emulsifying fluorine-containing acrylate block copolymer prepared by the method has excellent pH stability, chemical stability, diluting stability and storage stability; and the fluorine-containing structure units are distributed in form of blocks on the polymeric chain of the fluorine-containing acrylate block copolymer so that the fluorine-containing chain segments can be effectively utilized. Compared with a random fluorocarbon resin, the fluorine-containing acrylate block copolymer is capable of achieving the same performance and the usable amount of fluorine-containing monomers is very low. Moreover, textiles finished by the fluorine-containing waterproofing agent have excellent waterproofness; and compared with the similar products, the fluorine efficiency is improved and the cost is reduced.

The invention provides a SOD gene from animal and a method for cloning and expressing the SOD gene in colibacillus and yeast cells, wherein a nucleotide sequence of superoxide dismutase is shown as SEQ NO.1; an amino acid sequence of the superoxide dismutase is shown as SEQ NO.2; carriers of nucleotide molecules are colibacillus plasmids or yeast plasmids; cells of the nucleotide molecules are formed by carrier conversion; and cells of the nucleotide molecules of the superoxide dismutase contain colibacillus containing the nucleotide molecules or converted by the carriers or pichia yeast containing the nucleotide molecules or converted by the carriers. The invention can prepare recombinant production strains which can efficiently express and secrete Cu/Zn-SOD, realizes the production industrialization of the Cu/Zn-SOD, and achieves good pH stability, favorable thermal stability and Cu/Zn-SOD products with anti-protease hydrolyzation capacity.

The invention belongs to the technical field of material preparation and particularly provides a method of producing a super-hydrophobic/oleophylic oil-water separation mesh membrane through one-step electro-deposition. The method includes the steps of: employing pretreated copper sheet and metal mesh respectively as an anode and a cathode; under a constant current being 0.05-1 A/dm<2>, performing ultrasonic electro-deposition for 1-30 min to produce the super-hydrophobic/oleophylic oil-water separation mesh membrane on the cathode, wherein an electrolyte is prepared by adding a certain amount of dopamine to a mixture solution containing a nickel ion water solution and a long-chain alkyl mercaptan ethanol solution. The method is simple in technology and is free of subsequent surface modification. The super-hydrophobic/oleophylic mesh membrane has excellent pH stability and high oil-water separation efficiency and is suitable for application and promotion at large scale. The invention provides an acceptable method for large-area quick preparation of oil-water separation mesh membranes.

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 the field of cells, in particular to a cell freezing medium and application thereof. The cell freezing medium is prepared by dissolving glycerol, propanediol, trehalose, sucrose, human albumin, glucose and the like in PBS buffer solution, wherein permeable protection fluid comprises the glycerol and the propanediol, and impermeable protection fluid comprises the trehalose,the sucrose and the human albumin, meanwhile the glucose is used for proving energy to cells, and the PBS buffer solution is used for maintaining pH stability of the cell freezing medium. According to the cell freezing medium, components are fixed, batch-to-batch variation is small, and pollutant sources such as germs and viruses are not introduced, the permeable and impermeable liquids are usedsimultaneously to provide frost resisting capability for the cells to improve survival rate of the cells, the glucose is further added to provide energy for the cells to further improve the survival rate of the cells, and finally the PBS buffer solution is used for maintaining the pH stability of the cell freezing medium, so that environment influence on the cells is reduced to improve the survival rate of the cells.

The invention relates to pullulanase producing strain and manufacturing method. It is named alieycloeacillus. And its preservation register number is CGMCC No.1504. The formed strain D-1 is one new species of alieycloeacillus. Its pullulanase pH is 3.5-4.5. If pH is higher then 5.0 or lower than 3.0, enzyme is inactive; if it is 4.0, residue enzyme energy is 88%; the optimum temperature is 60 centigrade degree; enzyme reaction is not need metal ion while temperature is 55-65 centigrade degree. Thus the enzyme can be used in starch processing saccharification stage. Compared with acidity pullulanase, the enzyme has better heat resistance and pH stability.