41 results about "Sodium dihydrogen phosphate dihydrate" patented technology

The invention relates to a preparation method of a hydroxyapatite / polylactic acid composite coating on the surface of medical magnesium alloy, which comprises the following steps of polishing a magnesium alloy basal body to remove an oxidation layer on the surface; carrying out acid etching pretreatment and neutralizing treatment on the magnesium alloy basal body; preparing transfer solution from sodium dihydrogen phosphate dihydrate and calcium nitrate terahydrate; preparing a biomimetic calcium-phosphate coating; dissolving polylactic acid in a chloroform solvent to prepare polylactic acid solution; immersing the prepared magnesium alloy / hydroxyapatite composite material in the polylactic acid solution, and coating the polylactic acid coating on the surface of the magnesium alloy / hydroxyapatite composite material by adopting the solution dip-coating method; and putting the magnesium alloy material for 2-3 days till chloroform in the polylactic acid solution is completely volatilized, thereby obtaining the composite material of which the surface of magnesium alloy is wrapped with the hydroxyapatite / polylactic acid composite coating. Compared with the prior art, the preparation method of the hydroxyapatite / polylactic acid composite coating on the surface of medical magnesium alloy overcomes the disadvantages of the single coating, and therefore, the corrosion resistance and the biocompatibility of magnesium alloy are obviously increased.

The invention relates to a method for preparing a biodegradable magnesium alloy surface-modified fluorinated hydroxyapatite coating, specifically: pretreatment of the magnesium alloy substrate, the conversion liquid used is composed of sodium dihydrogen phosphate dihydrate and nitric acid tetrahydrate Calcium-phosphorous coating was obtained by immersing the pretreated substrate sample in the conversion solution for 5h~100h; Alkali fluoride conversion solution is made of sodium hydroxide and sodium fluoride, the concentration of sodium hydroxide is controlled at 3~4g / L, the concentration of sodium fluoride is 4~5g / L, without heat treatment, calcium fluoride phosphorus coating is obtained layer; the calcium fluoride phosphorus coating was heat-treated at 300-350°C for 2-5 hours to prepare fluorinated hydroxyapatite; performance test: the morphology of the FHA coating prepared by combining the heat treatment process was elongated and flake-like and Arranged from the center to the surrounding, the electrochemical test shows that the FHA coating improves the self-corrosion potential of the substrate, and the immersion corrosion test shows that the actual protective effect of the FHA coating on the magnesium alloy substrate is better than that of the FA coating.

The invention discloses uratoma resolvent. The uratoma resolvent is prepared from 0.1-0.2 g of sodium dihydrogen phosphate dihydrate, 6-7 g of disodium hydrogen phosphate dodecahydrate and 100 ml of ultra-pure water; a preparation method comprises the steps of separately preparing 1000 ml of a sodium dihydrogen phosphate solution with the concentration being 0.2 mol / L and 1000 ml of a disodium hydrogen phosphate solution with the concentration being 0.2 mol / L, selecting 5.3 ml of the sodium dihydrogen phosphate solution and 94.7 ml of the disodium hydrogen phosphate solution with the concentration being 0.2 mol / L through an automatic potentiometric titrator, mixing and sufficiently stirring the selected solutions, adding alkalizer to the mixture, and adjusting and controlling the PH value to be 8 through PH test paper. The uratoma resolvent is convenient to use, safe and reliable and has no influence on cell viability, and no soft tissue damage is caused; uratoma can be dissolved rapidly and effectively, operation time can be shortened, the operation curative effect can be improved, and an operation can even be avoided through local injection treatment.

The invention provides a method for detecting detergent residues on fabrics by liquid chromatography, which establishes an experimental model to directly detect detergent residues on fabrics, and has the effects of high accuracy, strong reliability and wide applicability. The steps of the method of the present invention are: 1) preparation of diluent: diluent: 1000mL volume containing sodium dihydrogen phosphate dihydrate (NaH 2 PO 4 2H 2 O) 50g, 6.8mL sulfuric acid (ρ=1.84g / mL); 2) Preparation of derivatization reagent methylene blue solution: Weigh 10-100mg methylene blue in a 1000mL volumetric flask, and dilute to the scale with diluent for later use; 3) Anion surface Preparation of active agent standard solution: Weigh 10-100mg of anionic surfactant standard sample into a 1000mL volumetric flask, dilute it to the mark with ultrapure water, and use it as mother liquor to prepare standard solutions of different concentrations for later use; 4) Draw the anionic surfactant Agent correlation curve: 5) Sample detection.

The invention relates to a lauromacrogol gel for external use and a preparation method thereof. The components include urea, lauromacrogol, aloe extract, benzalkonium chloride, sodium alginate, potassium sorbate, menthol, glycerin, dodecahydrate Disodium hydrogen phosphate, sodium dihydrogen phosphate dihydrate and purified water. The feature of the present invention is to combine lauromacrogol, which has rapid antipruritic and pain relief, anti-inflammatory and detumescent effects, and aloe vera extract, which has astringent and skin repairing effects, and is used in the form of a gel film to treat 1-2 degree burns and mosquitoes Bites and bruises patients; this is beyond the reach of similar drugs for the treatment of burns and mosquito bites, and there is no similar treatment of anti-inflammatory products or related inventions.

The invention disclsoes a liquid-state NAG (glucosaminidase) correction solution. The correction solution is prepared from the following components: 0.13-13g / L of sodium dihydrogen phosphate dihydrate, 1.26-12.6g / L of disodium hydrogen phosphate dodecahydrate, 0.1-20g / L of sodium chloride, 0.05-3g / L of potassium chloride, 0.5-10g / L of BSA (bull serum albumin), 0.1-10g / L of a surfactant, 0.1-3g / L of a preservative, 50-200g / L of a protein stabilizer and 45U / L of [beta]-N-acetylglucosaminidase; and pH value of the NGA correction solution is 6.0-8.0. With the application of the liquid-state NAG correction solution provided by the invention, the shortcoming of a conventional correction solution which needs to be preserved in a freeze-dried mode is overcome, and preservation conditions of the correction solution are improved, so that item detection in the medical field are facilitated.