123 results about "Tetrabutylammonium hydroxide" patented technology

The invention discloses a preparation method of monolayer manganese dioxide nano-plates, including the following steps: (1) manganese nitrate is reacted with sodium hydroxide or potassium hydroxide with the existence of oxidant to produce NaxMnO2 or KxMnO2 having ordered laminated structure; (2) the NaxMnO2 or KxMnO2 having ordered laminate structure is added to sodium hydroxide aqueous solution, OHxMnO2 is obtained by hydro-thermal synthesis method, and the obtained OHxMnO2 is fully acid-cleaned to obtain HxMnO2; (3) tetrabutylammonium hydroxide or tetramethylammonium hydroxide is used for reacting with laminated HxMnO2, and the tetrabutylammonium hydroxide or tetramethylammonium hydroxide is inserted inside the laminated HxMnO2 so that the laminated HxMnO2 is dispersed into monolayer manganese dioxide nano-plates. The manganese dioxide nano-plates obtained in the invention have monolayer with the thickness of just 0.3 to 0.8 nm; and as electrode material, the chemical performance of manganese dioxide nano-plate electrode is obviously higher than that of carbon nanotube electrode.

Provided is a stripping method for stripping a modified resist from a semiconductor substrate by applying an etching solution to the semiconductor substrate, in which the etching solution contains an alcohol compound and a quaternary ammonium hydroxide compound and the quaternary ammonium hydroxide compound is at least one of tetraethylammonium hydroxide and tetrabutylammonium hydroxide.

The invention provides an MXene / graphene composite nanosheet, a preparation method and application thereof, an electrode plate and application thereof, and belongs to the technical field of two-dimensional materials. The invention provides the preparation method of the MXene / graphene composite nanosheet, the method comprises the following steps: mixing MAX and a hydrofluoric acid solution, and etching to obtain MXene; mixing the MXene with a tetrabutylammonium hydroxide solution, carrying out electrostatic adsorption, and then carrying out ultrasonic treatment so as to obtain a stripped MXenenanosheet; mixing the stripped MXene nanosheet with a graphene oxide suspension, and carrying out a self-assembly reaction to obtain an MXene nanosheet / graphene oxide nanosheet; and under a protectiveatmosphere, carrying out a reduction reaction on the MXene nanosheet / graphene oxide nanosheet to obtain the MXene / graphene composite nanosheet. The graphene in the MXene / graphene composite nanosheetprepared by the preparation method provided by the invention cannot be stacked again, the MXene / graphene composite nanosheet has excellent lithium storage performance, and the unique two-dimensional structure of the MXene and the graphene can be maintained.

It is disclosed a cleaning liquid for stripping and disssolving a photoresist pattern having a film thickness of 10-150 μm, which contains (a) 0.5-15 mass % of a quaternary ammonium hydroxide, such as tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, (b) 65-97 mass % of a water-soluble organic solvent, such as dimethylsulfoxide or a mixed solvent thereof with N-methyl-2-pyrrolidone, sulforane, etc., and (c) 0.5-30 mass % of water, and a method for treating a substrate therewith.

Firstly, to provide a developing solution for photolithography in which tetrabutylammonium hydroxide (TBAH) is used as an alkaline agent of the developing solution and deposition of TBAH is suppressed. Secondary, to provide a method for producing a developing solution for photolithography capable of suppressing TBAH deposition when producing the developing solution by diluting a concentrated developing solution containing TBAH and a production apparatus used for the production method. The present invention is firstly a developing solution for photolithography comprising tetrabutylammonium hydroxide (A), and at least one selected from the group consisting of a water-soluble organic solvent (B1), a surfactant (B2), and a clathrate compound (B3). The present invention is secondary characterized by maintaining the temperature of liquid at 27° C. or higher during dilution.

The invention provides a method for quantitatively detecting perfluorooctane sulfonate isomeride in a water sample, which belongs to the field of perfluorooctane sulfonate monitoring. The method for quantitatively detecting the perfluorooctane sulfonate isomeride in the water sample comprises the steps of (1) solid phase extraction: quantitatively taking the water sample, carrying out extraction with a solid phase extraction column, carrying out centrifugation to eliminate moisture in the extraction column after extraction, then purifying the dried extraction column by a buffer solution and methanol, eluting the purified extraction column with alkaline methanol, and collecting an eluant; (2) chemical processing of an extract: drying nitrogen of the eluant with wind, adding derivatization reagents, tetrabutylammonium hydroxide and methyl tertiary butyl ether, to be mixed, drying the solution nitrogen with wind, and adding the methyl tertiary butyl ether to be uniformly mixed so as to keep the volume constant; and (3) gas chromatography-mass spectrometric detection. The method successfully realizes the effective separation of the PFOS (perfluorooctane sulfonate) isomeride so as to realize the accurate and quantitative detection of the PFOS isomeride. Compared with the existing test technology, the method realizes the quantitative analysis and detection of the PFOS isomeride, and solves the problem of quantitative errors of PFOS.

The invention relates to a method for preparing tetrabutylammonium hydroxide, which is characterized by comprising the following steps of: blending potassium hydroxide and methanol, adding the mixture into mixed solution of tetrabutyl ammonium bromide and the methanol, filtering and precipitating under reduced pressure, and after heating and refluxing, cooling and crystallizing to obtain the finished product of the tetrabutylammonium hydroxide. By the method, the yield of the product is improved; the requirements of the market are met; and the economic benefit and the social benefit of an enterprise are improved.

The invention discloses a preparation method of nitrogen doped graphene quantum dots with high dispersion in a water phase and an application. The preparation method comprises the following steps: anaqueous solution of tetrabutylammonium hydroxide is used as an electrolyte; a graphite rod with high purity is used as a working electrode, a platinum wire electrode is used as a counter electrode, acalomel electrode is used as a reference electrode, and fixed potential chronoamperometry is used for electrolysis of the graphite rod; an electrolytic solution is filtered in order to remove a graphene slice layer, a dialysis bag is used for dialysis, in order to obtain the nitrogen doped graphene quantum dots with high dispersion in a water phase. The preparation method has the advantages of simple process, cheap and easily available raw materials, and short preparation time; the nitrogen doped graphene quantum dots have the characteristics of good dispersion in water phase, long fluorescentlifetime, high quantum yield, good biocompatibility, and the like; and the nitrogen doped graphene quantum dots have good application prospects in the fields of fluorescence detection of life samplesand imaging.

The invention relates to a preferred orientation growth method of MFI type zeolite, and mainly solves the problem of high toxicity in conventional templates. The method comprises the following steps of mixing a silicon source, an aluminium source, a template R1, a template R2 and water; adjusting a pH value of the reaction mixture to 8-14 with an inorganic base; wherein the molar ratio in the reaction mixture is as follows: Al2O3 / SiO2=0-0.05, R1 / SiO2=0.1-2, H2O / / SiO2=10-100 and R2 / SiO2=0.05-2; and crystallizing the above mixture for 1-10 days at a temperature of 100-250 DEG C, separating, washing and drying the crystallized mixture, and thus the preferred orientation growth MFI type zeolite is obtained, wherein the template R1 is selected at least one from tetramethylammonium hydroxide pentahydrate, tetraethylammonium hydroxide, tetrapropylammonium hydroxide or tetrabutylammonium hydroxide; and R2 is selected at least one from beta-diketone, a beta-diketone salt, oxalic acid, oxalate, pyrocatechol or 8-hydroxyquinoline. The preferred orientation growth method solves the problem well, and can be used in industrial production of the MFI type zeolite.

STA-20, a molecular sieve having a new framework type, is described. STA-20AP (as prepared) can have an alkyl amine, such as trimethylamine, and 1,6-(1,4-diazabicyclo[2.2.2]octane) hexyl cations (from diDABCO-C6) as SDAs. A lower alkyl ammonium hydroxide, such as tetrabutylammonium hydroxide, can be used as a pH modifier for making SAPO STA-20. A calcined product, STA-20C, formed from as made STA-20 is also described. Methods of preparing STA-20, activating STA-20 by calcination, and metal containing calcined counterparts of STA-20 are described along with methods of using STA-20 and metal containing calcined counterparts of STA-20 in a variety of processes, such as treating exhaust gases and converting methanol to olefins are described.

STA-19, a molecular sieve having a GME structure and phosphorus in the framework, is described. STA-19AP (as prepared) can have a lower alkyl amine, such as trimethylamine, and olig-(1,4-diazabicyclo[2.2.2]octane)-pentyl dibromide ([DABCO-C5]x where x represents the number of repeating units) or olig-(1,4-diazabicyclo[2.2.2] octane)-hexyl dibromide ([DABCO-C6]x) as SDAs. A lower alkyl ammonium hydroxide, such as tetrabutylammonium hydroxide (TBAOH), can be used as a pH modifier for the preparation of SAPO-STA-19. A calcined product, STA-19C, formed from STA-19AP is also described. Methods of preparing STA-19AP, STA-19C and metal containing calcined counterparts of STA-19C are described along with methods of using STA-19C and metal containing calcined counterparts of STA-19C in a variety of processes, such as treating exhaust gases and converting methanol to olefins are described.

The invention discloses paint for a polycarbonate lens. The paint for the polycarbonate lens comprises the following raw materials in parts by weight: 100 parts of a silicon resin prepolymer, 2-5 parts of polyborosiloxane, 1-3.8 parts of epoxy resin, 1-3.5 parts of amino resin, 0.1-1 part of hydroxy terminated polyester, 0.2-1.2 parts of carboxyl terminated polyester, 0.1-0.25 parts of tetrabutylammonium hydroxide, 0.2-0.6 parts of methylhexahydrophthalic anhydride, 0.05-0.12 parts of 2-methylimidazole, 0.1-0.5 parts of bicyclic amidine, 3-9 parts of ethyl alcohol, 5-15 parts of n-butyl alcohol, 1-3 parts of modified nano-zinc oxide, 0.3-1 part of nano zirconium dioxide, 0.5-2 parts of nano titanium dioxide, and 0.05-0.25 parts of an ultraviolet absorber. The provided paint for the polycarbonate lens is good in abrasive resistance, high in hardness, excellent in ultraviolet resistance, and high in adhesive force with the polycarbonate.

It is disclosed a cleaning liquid for stripping and dissolving a photoresist pattern having a film thickness of 10-150 μm, which contains (a) 0.5-15 mass % of a quaternary ammonium hydroxide, such as tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, (b) 65-97 mass % of a water-soluble organic solvent, such as dimethylsulfoxide or a mixed solvent thereof with N-methyl-2-pyrrolidone, sulforane, etc., and (c) 0.5-30 mass % of water, and a method for treating a substrate therewith.

The invention discloses a quality control method of cefixime. Octadecyl silane bonded silica gel is adopted as the chromatographic column of filler, and the detection conditions are as follows: mobilephase: phase A: tetrabutyl ammonium hydroxide aqueous solution (pH 6.5) and acetonitrile in a ratio of 50:50, phase B: tetrabutylammonium hydroxide aqueous solution (pH6.5) and acetonitrile in a ratio of 85:15, column temperature: 0-50DEG C, sample size: 5-25microL, sample introduction concentration: 0.0005-2mg / mL, flow rate: 0.8-1.5ml / min, and detection wavelength: 254nm. The method provided bythe invention can achieve effective separation and quantitative detection of unknown impurities undetectable in the prior art, and the detection efficiency and detection accuracy are both higher thanthose of the prior art. The method has high universality, and can be widely applied to quality detection of cefixime bulk drugs from different sources and corresponding preparations thereof.

The invention discloses a method for recovering tetrabutylammonium hydroxide by electrolysis of a tetrabutylammonium sulfate solution, and belongs to the technical field of recovery of tetrabutylammonium hydroxide by bipolar membrane electrodialysis. According to the key points of the technical scheme, the tetrabutylammonium sulfate solution is subjected to bipolar membrane electrodialysis in a four-compartment electrodialysis device with an intermediate liquid chamber, and the four-compartment electrodialysis device with the intermediate liquid chamber comprises polar liquid chambers at bothsides and an electrodialysis compartment sandwiched between the polar liquid chambers at two sides, and the electrodialysis compartment is of a four-compartment structure and is composed of the intermediate liquid chamber, an acid liquid chamber, a material liquid chamber and an alkaline liquid chamber which are formed by alternately and separately arraying a bipolar membrane, a cationic exchangemembrane, an anionic exchange membrane, a cationic exchange membrane and a bipolar membrane; a tetrabutylammonium hydroxide solution is obtained in the alkaline liquid chamber, and a sulfuric acid solution is obtained in the acid liquid chamber. The method can remarkably improve the purity and the recovery rate of the recovered product tetrabutylammonium hydroxide.

The invention relates to a method of preparing SAPO-56, (AFX) using a lower alkyl amine, preferably trimethylamine, and a 1,4-diazabicyclo [2.2.2]octane derivative, preferably comprising either 1,4-(1,4-diazabicyclo[2.2.2]octane)butyl cations or 1,5-(1,4-diazabicyclo[2.2.2]octane)pentyl cations, as structure directing agents (SDAs). A lower alkyl ammonium hydroxide, such as tetrabutylammonium hydroxide (TBAOH), can be used to control the pH. The invention also relates to SAPO-56 comprising a lower alkyl amine, such as trimethylamine, and a 1,4-diazabicyclo [2.2.2]octane derivative, such as a compound comprising either 1,4-(1,4-diazabicyclo[2.2.2]octane)butyl cations or 1,5-(1,4-diazabicyclo[2.2.2]octane) pentyl cations.

A detection method of cis-trans isomers in cis-propenyl phosphonic acid and related impurities thereof is applicable to the field of pharmaceutical analysis, and the method comprises the following steps and conditions: the chromatographic conditions are that the chromatographic column is a C-18 column of 4.6 mm*250 mm*5.0 microns; the flow velocity is 1.0 ml / min; an ultraviolet detector has a detection wavelength of 225 nm and a sample size of 10 microliters; the mobile phase is 50 mmol / L dipotassium hydrogen phosphate aqueous solution-methanol; preparing a test solution by dissolving 0.1 microliters of test samples in the mobile phase, diluting to 25 ml, and filtering; introducing 10 microliters of the test solution, recording a spectrum, wherein the retention time for cis-propenyl phosphonic acid is 12.3 min, the relative retention value of its cis-trans isomers is 1.15, and the relative retention value of propadiene phosphonic acid is 0.38, and calculating the contents of various impurities by an area normalization method; in the mobile phase, the 50 mmol / L dipotassium hydrogen phosphate aqueous solution contains 2% of tetrabutylammonium hydroxide aqueous solutions; the concentration of the tetrabutylammonium hydroxide aqueous solution is 55%. According to the invention, the method is used for the detection of cis-trans isomers in cis-propenyl phosphonic acid and related impurities thereof, and the repeatability, the sensitivity, and the accuracy all meet the requirements.

The invention discloses a cellulose solution and a method for dissolving cellulose. The method includes: adding cellulose into an alkyl ammonium hydroxide aqueous solution with the temperature of 0-20DEG C and the concentration of 1.0-2.5 M, and performing stirring for 0.55 min to obtain a transparent cellulose solution, wherein the alkyl ammonium hydroxide is one or a mixture of more of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, benzyltrimethylammonium hydroxide and benzyltriethylammonium hydroxide. The method issuitable for natural cellulose with the molecular weight of 6.4 * 10 < 4 >-1.5 * 10 < 5 >, and is simple and convenient to operate, short in dissolving time and free of pollution to the environment; asolvent system is a single-component solvent, the prepared cellulose solution can be used for regenerating cellulose by taking a 0-0.5 M alkyl ammonium hydroxide aqueous solution as a coagulating bath, alkyl ammonium hydroxide in the waste liquid is easy to recover and recycle, and the method has a very wide application prospect.

The invention relates to a preparation method of flame-retardant, antibacterial and waterproof waterborne acrylate resin. The method comprises steps as follows: walnut green husks are peeled, cleaned with water, dried to constant weight in an oven at the temperature of 40-60 DEG C, ground and screened by a sieve with 60-80 meshes, and walnut green husk powder is obtained; the walnut green husk powder and water are weighed, allyltrimethylammonium chloride, methyl 4-methoxyacetoacetate and tetrabutylammonium hydroxide are added for backflow and decoction for two times at the temperature of 80-90 DEG C, decocted liquids are combined, filtered and subjected to decompression concentration at a temperature of 60-70 DEG C until a concentrated liquid is in a thick paste shape with water content ranging from 15% to 20% and reaches the constant weight, and a walnut green husk extract concentrated liquid is obtained and applied to the acrylate resin. The obtained acrylate resin has good affinity with human bodies, good flame retardance and good waterproof property.

The invention discloses a method for preparing a niobium pentaoxide membrane. The method comprises the following steps: mixing niobium pentaoxide and potassium carbonate in a molar ratio of 3:1; after calcination, adding the calcinated materials into hydrochloric acid, stirring and filtering the mixed solution, adding hydrochloric acid in the same ratio into the mixed solution, stirring and filtering the mixed solution, and repeating four times; washing filter cakes by deionized water, drying the filter cakes, adding a 0.5mol / l tetrabutylammonium hydroxide solution into the filter cakes, stirring the mixture, and obtaining niobium pentaoxide nano flake sol under high-speed centrifugation; and preparing a 2.5g / l polyethyleneimine solution, immersing a clean quartz plate into the polyethyleneimine solution for soaking, taking the quartz plate out, washing the quartz plate by the deionized water, blowing the quartz plate to dryness, immersing the quartz plate into niobium pentaoxide sol for soaking, taking the quartz plate out, washing the quartz plate by the deionized water, blowing the quartz plate to dryness by pure nitrogen to obtain a layer of the niobium pentaoxide membrane, and repeating the process to prepare different layers of the niobium pentaoxide membrane. The method has the advantages of simple operation, low cost and suitability for industrial production.

The invention discloses a flame retardant based on phosphaphenanthrene group modified zirconium phosphate. According to the invention, tetrabutylammonium hydroxide and phosphoric acid are used for stripping zirconium phosphate to expose hydroxyl groups among zirconium phosphate layers, then a silane coupling agent is used for grafting zirconium phosphate, and benzaldehyde and DOPO are used for modifying stripped zirconium phosphate nanosheets. In the obtained flame retardant, the zirconium phosphate plays a flame retardant role on a substrate, realizes rapid carbon formation on the surface ofthe substrate so as to fill in gaps among sheet layers and form a large number of micro-nano carbon cages, and seals a large number of substrate degradation products in the micro-nano carbon cages forsufficient catalysis and carbonization via the zirconium phosphate in a high-temperature oxygen-deficient environment; meanwhile, free radicals of DOPO can be captured and take action in microscopiccarbon cages, so the flame-retardant effect is achieved on a microstructure level. The obtained flame retardant integrates the functions of flame retardance, smoke suppression and enhancement, and isfree of halogen, low in cost, good in char forming property, friendly to environment and wide in applicability; and a preparation method of the flame retardant is simple in process and suitable for application and promotion.

The invention discloses a method for preparing tetrabutylammonium hydroxide by taking tetrabutylammonium sulfate as a raw material, and belongs to the technical field of preparation of tetrabutylammonium hydroxide by bipolar membrane electroosmosis. According to the technical scheme, the method for preparing the tetrabutylammonium hydroxide by taking the tetrabutylammonium sulfate as the raw material comprises the following step: carrying out bipolar membrane electroosmosis on a tetrabutylammonium sulfate solution in a three-compartment electroosmosis device. The three-compartment electroosmosis device comprises polar liquor chambers and an electroosmosis compartment, the polar liquor chambers are arranged on two sides of the three-compartment electroosmosis device, the electroosmosis compartment is sandwiched between the polar liquor chambers on the two sides, has a three-compartment structure, and is formed by unit groups of an acid liquor chamber, a material liquor chamber and an alkali liquor chamber in an arranged manner, the unit groups of the acid liquor chamber, the material liquor chamber and the alkali liquor chamber are formed by a bipolar membrane, an anion exchange membrane, a cation exchange membrane and another bipolar membrane which are arranged alternately at intervals, a tetrabutyl ammonium hydroxide solution is obtained from the alkali liquor chamber, and asulfuric acid solution is obtained from the acid liquor chamber. The three-compartment bipolar membrane electroosmosis process has the characteristics that the production process is safe, harmful gasis not generated, and energy consumption is low.

The invention discloses a wear-resisting and high-rigidity polycarbonate lens. The wear-resisting and high-rigidity polycarbonate lens comprises a polycarbonate substrate and a coating which covers the surface of the polycarbonate substrate, wherein the coating is prepared from the following raw materials: a silicon resin pre-polymer, polyurethane, epoxy resin, hydroxyethyl methylacrylate, polyester polyol, aluminum acetylacetonate, dibutyltin dilaurate, tetrabutylammonium hydroxide, methylhexahydrophthalic anhydride, 2-methylimidazole, bicyclic amidine, a solvent, a silane coupling agent andan auxiliary agent. The wear-resisting and high-rigidity polycarbonate lens provided by the invention has good wear resistance, high surface rigidity, excellent heat-resisting performance and long service life.

The invention discloses a preparation method of a cefradine molecule imprinted membrane, which comprises the following steps: 1) using a phase inversion method to prepare a polyacrylonitrile basal film; 2) preparing the cefradine molecule imprinted membrane: taking cefradine as a template molecule, taking methacrylic acid as a functional monomer, taking ethylene glycol dimethacrylate as a cross-linking agent; taking azodiisobutyronitrile as an initiator; using cefradine, tetrabutylammonium hydroxide and methanol to prepare a filtrate; adding methacrylic acid, ethylene glycol dimethacrylate and azodiisobutyronitrile in the filtrate, uniformly stirring to obtain a membrane liquid; putting the obtained polyacrylonitrile basal film in the membrane liquid for immersing, then performing polymerization and elution in order to obtain the cefradine molecule imprinted membrane. The cefradine molecule imprinted membrane can used for determining the concentration of cefradine in a liquid state sample to be measured. The invention also provides a method for determining the concentration of the liquid state sample to be measured in cefradine.

The invention discloses a preparation method of choline glycerophosphate. The preparation method comprises the following steps: 1) mixing and filtering soybean phospholipid and methyl alcohol, removing a filter residue to obtain a clear liquid M1; 2) adding a tetrabutylammonium hydroxide solution into the clear liquid M1 prepared in the step 1), and stirring and mixing for 30-100 minutes under the condition that the stirring speed is 30-100 r / min, thereby obtaining a mixture M2; 3) adding acetone into the mixture M2 prepared in the step 2), mixing, and removing an acetone layer, thereby obtaining a crude extract M3; 4) separating the crude extract M3 prepared in the step 3) through thin layer chromatography, and collecting, thereby obtaining the choline glycerophosphate. Through the design, the extraction method is simple in operation, the purity of the prepared choline glycerophosphate is relatively high, and the production efficiency is greatly improved.

STA-20, a molecular sieve having a new framework type, is described. STA-20AP (as prepared) can have an alkyl amine, such as trimethylamine, and 1,6-(1,4- diazabicyclo[2.2.2]octane) hexyl cations (from diDABCO-C6) as SDAs. A lower alkyl ammonium hydroxide, such as tetrabutylammonium hydroxide, can be used as a pH modifier for making SAPO STA-20. A calcined product, STA-20C, formed from as made STA-20 is also described. Methods of preparing STA-20, activating STA-20 by calcination, and metal containing calcined counterparts of STA-20 are described along with methods of using STA- 20 and metal containing calcined counterparts of STA-20 in a variety of processes, such as treating exhaust gases and converting methanol to olefins are described.

A dye for dye-sensitized solar cells includes an organometallic complex represented by M(L)pX2:(Z)q. In the organometallic complex, M is a Group 8 through Group 10 metallic element, L is a bidentate ligand, X is a co-ligand, and Z is a counter-ion. The ratio of the bidentate ligand (L) to the counter-ion (Z) is about 1.1 to about 1.4. A method of preparing an exemplary dye includes mixing the organometallic complex with tetrabutylammonium thiocyanate and tetrabutylammonium hydroxide to prepare a solution, and purifying the solution at a pH of about 3.8 to about 4.1. A dye-sensitized solar cell includes a first electrode with a light absorbing layer, a second electrode and an electrolyte between the first and second electrodes. The light absorbing layer includes the dye.

The invention relates to an analysis method for detecting oxalic acid content; a high performance liquid chromatograph is adopted, and chromatographic conditions are as follows: an octadecylsilane chemically bonded silica chromatographic column is adopted, a mobile phase is phosphate buffered solution (containing tetrabutylammonium hydroxide)-acetonitrile, and the mobile phase A and the mobile phase B are carried out according to a gradient program; the flow rate is 0.9-1.6 ml / min; the column temperature is 28-40 DEG C, the detection wavelength is 200-210 nm, and the sample size is 20-50 [mu]l. The detection method has the advantages of high sensitivity and good linear relationship, and is suitable for detecting the oxalic acid content in vitamin C or preparations containing vitamin C.

The invention discloses a particle emulsifier based on a colloid self-assembled by hydrophobic modified hyaluronic acid and a preparation method of the particle emulsifier, and belongs to the technical field of self-assembly of natural macromolecules and preparation of the particle emulsifier. The preparation method of the particle emulsifier comprises the following steps: step 1, HA (hyaluronic acid) and TBA-OH (tetrabutylammonium hydroxide) are compounded; step 2, 2-bromoethanol and 7-hydroxyl-4-methylcoumarin are adopted for a nucleophilic substitution reaction, and HEMC (7-(2-hydroxyethoxy)-4-methylcoumarin) is prepared; step 3, a compound obtained in the step 1 and HEMC have an esterification reaction under the action of a catalyst, and HA-HEMC (hydrophobic modified HA) is obtained; step 4, HA-HEMC is self-assembled in a selective solvent, a colloid dispersing agent is formed and freeze-dried, and the particle emulsifier is obtained. The particle emulsifier based on the colloid self-assembled by hydrophobic modified hyaluronic acid has good biocompatibility, can effectively stabilize an oil-water interface and can be applied to the fields of cosmetics, food, bio-medicine and the like.

The invention belongs to the technical field of chemical drug analysis, and relates to a method for detecting disodium ethylene diamine tetraacetate contained in an acetylcysteine aerosol inhalation solution. High performance liquid chromatography is adopted for detection, and the chromatographic conditions are as follows: chromatographic column: octadecylsilane chemically bonded silica is used asa filler; a mobile phase A: precisely measuring 5.0 mL of a 40% tetrabutylammonium hydroxide solution, adding water to dilute the solution to 1000 mL, and adjusting the pH value to 2.5 with phosphoric acid; a mobile phase B: acetonitrile; the column temperature: 30 DEG C; the detector: an ultraviolet detector; the flow rate: 1.0 mL / min; the detection wavelength: 260 nm; the sample size: 20 [mu] L; the elution mode: isocratic elution, and the volume ratio of the mobile phase A to the mobile phase B is 88: 12. By adopting the high performance liquid chromatography, the target product peak can be effectively separated from other peaks in the test solution.