72 results about "Potassium iodine" patented technology

The invention relates to the technical field of food detection, in particular to a method for determining the iodine content in formula food for special medical purposes. The determination method comprises the following steps: (1) weighing potassium iodide, and adding water for dissolving to obtain a reference substance working solution; (2) adding water into a test sample to obtain a sample suspension, and performing alkali ashing treatment to obtain a sample solution; (3) adding a sulfuric acid solution and a reagent adopted for alkali ashing treatment into the reference substance working solution, and respectively performing derivatization treatment and organic solvent extraction on the reference substance working solution and the sample solution to obtain a reference substance solution and a test solution; (4) testing by adopting a gas chromatographic method, and calculating the iodine content; reagents adopted in the alkali ashing treatment are a potassium hydroxide solution, a potassium nitrate solution and a potassium permanganate solution (or manganese dioxide); the derivatization treatment comprises the steps of adding a sodium sulfite solution, standing, and adding a ketone reagent and a hydrogen peroxide solution to carry out a derivatization reaction. The method has the advantages of being low in cost, high in safety and high in accuracy.

The invention belongs to the field of pharmaceutical preparations, and relates to a multi-trace element injection and a preparation method thereof. The multi-trace element injection comprises effective components, a stabilizer and water, the effective components comprise chromium chloride, copper chloride, ferric chloride, manganese chloride, sodium molybdate, sodium selenite, zinc chloride, potassium iodide and sodium fluoride, and the stabilizer comprises xylitol, a pH regulator and an additive; and the additive is PEG (Polyethylene Glycol) 400 or PEG 600. The multi-trace element injection provided by the invention can effectively inhibit the loss of iodine in the sterilization process, and the stability, economical efficiency and production controllability of the multi-trace element injection are fundamentally improved.

The invention relates to deodorizing and sterilizing ionized water and a preparation method thereof. The deodorizing and sterilizing ionized water comprises the following raw materials in parts by mass: 1 part of zeolite calcium, 1 part of bentonite, 1.5 parts of chitin, 0.5-1 parts of sericite, 0.2 parts of sulfur, 0.2 parts of potassium iodide, 0.1-0.8 parts of alkanolamide, 1 part of ethylene glycol, and 100 parts of reverse osmosis water. The preparation method comprises the following steps: step 1, weighing the raw materials in parts by mass; step 2, putting the raw materials weighed in step 1 into a mixing and filtering device for mixing and filtering to obtain a finished filtrate. The deionized water prepared by the invention has good deodorizing and sterilizing effects by emitting far infrared rays and generating negative oxygen ions. At the same time, intermittent centrifugal filtration and intermittent slag discharge are achieved by an intermittently lifting valve plate, a rotating screen drum, an intermittently rotating slag lowering pipe, and a scroll scraper, so that a filter bag on the inner wall of the screen drum is kept clean, thereby improving the filtration speed and the finished product filtration rate.

To provide a mouthwash mixed with povidone iodine (PVPI), containing PVPI in a higher concentration than a conventional product (7%), and to provide a method for producing the same.SOLUTION: A method for producing a povidone-iodine-containing mouthwash containing povidone iodine in an amount of 10% by mass or more based on the total amount (100% by mass) of the mouthwash, the method comprising the steps of: 2.14 4.28, A method for producing a gargle, comprising the steps of: dispersing PVPI in PG to obtain a dispersion; and mixing the dispersion with a mixed solution a1 in which at least one selected from the group consisting of ethanol, glycerin, D-sorbitol solution (70%), saccharin sodium, and 1-menthol is dissolved in water, or a mixed solution a1 in which potassium iodine is further dissolved in the mixed solution a2.SELECTED DRAWING: None

The invention discloses a method for measuring dissolved oxygen in aquaculture tail water by a spectrophotometric method based on an iodine-ascorbic acid-potassium dichromate system, and belongs to the technical field of water quality detection. The method comprises the following steps: sequentially adding a manganese sulfate solution and an alkaline potassium iodide solution into a to-be-detected culture tail water sample, sealing a container, fully reacting, and standing after the reaction is finished to completely precipitate Mn2O3; adding a citric acid solution, sealing, reacting, completely dissolving the precipitate and releasing the iodine elementary substance, adding water and an ascorbic acid-potassium dichromate mixed color developing agent into the solution after the reaction is finished, fixing the volume, sealing, uniformly mixing, and carrying out a color developing reaction in a dark place; a blank sample is used for reference, the culture tail water subjected to color development is placed in a sample pool of a spectrophotometer, the spectrophotometric value of the sample is measured at the wavelength of 360 nm, and the dissolved oxygen concentration is calculated according to a standard curvilinear equation. The method provided by the invention reduces the detection limit of the traditional spectrophotometric method, and has the advantages of high sensitivity, strong anti-interference capability, high speed and rapidness in operation, wide application range, greenness and environmental protection.

The invention relates to an organic silicon heat conduction material, in particular to a repairable liquid crystal type organic silicon heat conduction material and a preparation method and application thereof. P-hydroxybenzaldehyde, potassium carbonate, potassium iodide and halogenated olefin are used for preparing a monomer M1; then reacting the monomer M1 with aromatic diamine to prepare a diene liquid crystal monomer M2; and finally, reacting the diene liquid crystal monomer M2 with hydrogen-containing silicone oil to prepare the organic silicon heat-conducting material. The repairable liquid crystal type organic silicon heat conduction material has excellent heat conduction performance and electrical performance, can repair damaged materials in a proper temperature range through an exchange reaction of imine bonds, and is suitable for preparation of heat conduction components and / or heat conduction packaging of circuit boards.

The application relates to the technical field of electrocatalytic reduction of carbon dioxide, and provides a preparation method and application of a zinc-iodine diatomic pair (Zn-I / ICPs) carbon dioxide electro-reduction catalyst. The zinc-iodine diatomic pair is prepared by using nitrogen-doped carbon as a carrier and an in-situ gas-capturing MOF method, and the specific steps are as follows: first, ZIF-8 precursors are prepared by using zinc nitrate hexahydrate and 2-methyl imidazole as raw materials; then, the ZIF-8 and potassium iodide are co-pyrolyzed under a nitrogen atmosphere, the potassium iodide is used as an iodine source, zinc and iodine atoms are combined in an atomic dispersion form through a gas-phase doping mode, and a Zn-I diatomic pair is formed. The preparation method is simple and controllable, in the prepared Zn-I / ICPs, Zn sites and I sites successfully construct a synergistic catalytic center with complementary functions and electronic coupling, can effectively control an electrochemical microenvironment, accelerate water dissociation and proton transfer, and simultaneously highly effectively inhibit a hydrogen evolution side reaction, and the zinc-iodine diatomic pair can catalyze carbon dioxide electro-reduction to prepare carbon monoxide with high activity and high selectivity.

The application provides a method for separating thiophene compounds in petroleum oil products and application thereof, and the method comprises the following steps: S1: dissolving the petroleum oil product and an alkylating agent in a first solvent to obtain a dissolved oil sample; S2: loading a filler loaded with a catalyst into an adsorption column, transferring the dissolved oil sample into the adsorption column, standing, then sequentially eluting the adsorption column with a second solvent and a third solvent respectively, and collecting an eluent eluted by the third solvent; and S3: fully mixing the eluent with potassium iodide modified silica gel, filtering and collecting a filtrate, so that the thiophene compounds are separated. According to the method, the thiophene compounds in the petroleum can be separated with high purity and high yield, the operation condition of the method is mild, and the thiophene compounds in the petroleum oil products, especially in the high maturity crude oil, can be completely, efficiently and accurately separated.

The invention discloses a composite inhibitor composed of a metal chelating agent and a free radical scavenger and application of the composite inhibitor in inhibition of degradation of an amine absorbent in CO2 capture, and belongs to the field of CO2 capture after combustion. The composite inhibitor is composed of a metal chelating agent and a free radical scavenger, the metal chelating agent refers to diethylene triamine penta (methylene phosphonic acid) (DTPMP) or diethyl triamine pentaacetic acid (DTPA), and the free radical scavenger refers to potassium iodide (KI) or sodium thiosulfate (Na2S2O3). The mass fraction of the metal chelating agent in the composite inhibitor is 10-90%, and the mass fraction of the composite inhibitor added into the amine absorbent is 0.1-1.0%. The composite inhibitor disclosed by the invention can be used for remarkably inhibiting degradation of an alcohol amine absorbent in the field of CO2 capture, and has the characteristics of strong inhibition effect, low price, good stability and high solubility. In addition, through the synergistic inhibition effect between the metal chelating agent and the free radical scavenger in the composite inhibitor, the usage amount of the composite inhibitor can be greatly reduced, and the cost of the inhibitor is reduced.

The invention belongs to the technical field of material science and engineering, and particularly discloses an optimization method for improving the piezoelectric property of a KNN crystal based on composite polarization, and the method comprises the following steps: S1, polishing the potassium sodium niobate crystal, and plating Au electrodes on the upper and lower surfaces of the potassium sodium niobate crystal to obtain an initial material body; s2, putting the initial material body obtained in the step S1 into a crucible filled with silicone oil, and carrying out heating direct current polarization treatment to obtain a polarized material body; s3, putting the polarized material body obtained in S2 into a potassium iodide solution, then polishing, and plating Au electrodes on the upper surface and the lower surface of the polarized material body again to obtain an intermediate material body; and S4, performing normal-temperature alternating-current polarization treatment on the intermediate material body obtained in S3 to obtain the composite polarization material body. According to the optimization method for improving the piezoelectric property of the KNN crystal based on the composite polarization, the piezoelectric property of the KNN crystal is remarkably improved, the required cost is low, the consumed time is short, and practical application and popularization are easier.

The invention discloses a preparation method of a delta-aminoketone derivative, which comprises the following steps: reacting olefin, N-aryl sulfonyl aziridine, arylboronic acid, nickel iodide, 5, 5 '-dimethyl-2, 2'-bipyridine, formic acid, acetic anhydride, sodium carbonate and potassium iodide at 80 DEG C for 20 hours, and after the reaction is completed, performing post-treatment to obtain the delta-aminoketone derivative. According to the preparation method, olefin, N-aryl sulfonyl aziridine and arylboronic acid are taken as reactants, formic acid is taken as a carbonyl source, the reaction condition is mild, the operation is simple, the tolerance range of substrate functional groups is wide, and the reaction efficiency is high. Various delta-aminoketone derivatives can be synthesized according to actual needs, so that the method is convenient to operate, and the practicability of the method is widened.

The application discloses a method for detecting iodine content in diltiaxin bulk drug and a quality control method of the iodine content, and belongs to the technical field of drug detection and quality control, and comprises the following steps: preparing a control solution of potassium iodide; dissolving the to-be-detected substance in a hydrazine solution after combustion to prepare a test solution; performing liquid chromatography detection on the control solution and the test solution to obtain corresponding chromatograms; and calculating the iodine content in the to-be-detected substance according to the concentration and peak area of the control solution and the concentration and peak area of the test solution in the chromatograms. The application can quantitatively detect the residual iodine content based on the liquid chromatography detection method, the analysis result is reliable, and the application has the advantages of high detection precision, simple operation steps, high detection efficiency and the like.

This invention provides a method for preparing 1,2-diaminomethyl-cyclobutane-diiodoplatinum. The method includes: preparing crude 1,2-diaminomethyl-cyclobutane-diiodoplatinum using potassium chloroplatinate, potassium iodide, diaminomethylcyclobutane oxalate, and alkali metal hydroxide as raw materials; dissolving the crude product in a mixed solvent of N,N-dimethylformamide and acetonitrile; filtering to obtain a filtrate; adding water to the filtrate to induce crystallization and obtain 1,2-diaminomethyl-cyclobutane-diiodoplatinum; wherein the molar ratio of potassium chloroplatinate to potassium iodide is controlled at 1:12 to 1:20; and the molar ratio of diaminomethylcyclobutane to potassium chloroplatinate in diaminomethylcyclobutane oxalate is 0.95 to 1.15:1, etc., resulting in a purity of 1,2-diaminomethyl-cyclobutane-diiodoplatinum greater than 90%, thus solving the technical problem of low purity in existing technologies.

The application discloses an anti-fatigue composition for high-temperature environment and application, and belongs to the technical field of medicines.The anti-fatigue composition for high-temperature environment is composed of the following components in parts by weight: 15-45 parts of mung beans, 15-45 parts of adzuki beans, 15-45 parts of black beans, 5-15 parts of licorice, 5-20 parts of medlar, 2-12 parts of American ginseng, 0.3-1 parts of L-calcium lactate, 0.01-0.05 parts of zinc gluconate, 0.00005-0.0005 parts of potassium iodide, 0.0002-0.0015 parts of vitamin and 0.0001-0.001 parts of vitamin.The anti-fatigue composition for high-temperature environment can enhance the anti-heat stress capacity of mice exposed to high temperature, prolong the exhaustive swimming time of mice under high-temperature load and enhance the anti-fatigue capacity of mice in a high-temperature environment.

The present invention relates to a preparation method of a NIR / CT dual-modal imaging probe targeting CD146, comprising: mixing a compound specifically binding to CD146 with hydroxyethyl cellulose to obtain CD146 monoclonal antibody-modified hydroxyethyl cellulose; using L-glutathione, formamide, and gadolinium chloride as raw materials, and preparing near-infrared fluorescent gadolinium(III)-doped carbon dots by a solvothermal synthesis method; mixing CD146 monoclonal antibody-modified hydroxyethyl cellulose with near-infrared fluorescent gadolinium(III)-doped carbon dots to obtain a probe; dissolving the probe in methanol, adding potassium iodide and sodium hydroxide for reaction, and filtering to obtain the NIR / CT dual-modal imaging probe targeting CD146. The present invention prepares a NIR / CT dual-modal imaging probe with high sensitivity and specificity for CD146 molecules, which integrates the characteristics of high sensitivity of NIR and high spatial resolution of CT for the detection of small metastatic tumor lesions, extracts more imaging details through multi-dimensional information, and provides more comprehensive and accurate tumor detection and evaluation.

The invention belongs to the technical field of fire extinguishing materials. The invention provides a fire extinguishing material additive, an inorganic powder fire extinguishing material and a preparation method thereof, the fire extinguishing material additive comprises a first composition and a second composition, the first composition comprises polyoxyethylene, cellulose ether, diammonium hydrogen phosphate, urea, pentaerythritol, a leveling agent, a defoaming agent, silicone amide, potassium iodide and deionized water, the second composition includes hydrogen peroxide. According to the fire extinguishing material additive, inorganic powder is rapidly foamed at a high rate to form powder foam with the volume rate of 30-60 times to form foam solids, the foam bodies have relatively high stability, and the inorganic powder fire extinguishing material has the effects of suffocation, isolation, wrapping and the like, can rapidly extinguish solid, liquid, gas, charged and cooking material fire extinguishing materials, and can be used as a fire extinguishing material for fire extinguishing. The fire behavior can be rapidly and effectively controlled, a fire source can be rapidly blocked, secondary pollution is avoided, and reburning is not prone to occurring.

A composition comprising: lactoperoxidase, an iodide salt, and a pharmaceutically acceptable carrier and / or excipient is provided, for use in the treatment or prevention of equine gastric ulcer syndro

The invention discloses a method for determining the content of phenol in an iron-dextran injection / solution through combination of iron-sodium dihydrogen phosphate precipitation impurity removal and back titration, and relates to the field of analytical chemistry. According to the method, pretreatment is realized through precipitation reaction of iron and sodium dihydrogen phosphate, and interference of iron ions in iron dextran on detection is eliminated. Phenol and bromine are subjected to a bromo-phenol reaction through a potassium bromate-potassium bromide system, excessive bromine and potassium iodide are subjected to a reaction to generate iodine, a sodium thiosulfate titration solution is used for titration by means of an iodometric method, and the content of phenol is calculated. The method does not need a precise instrument, is simple and convenient to operate, can simply, quickly and accurately measure the phenol content in the iron-dextran injection / solution, effectively solves the problem of the existing detection technology in the detection of the sample, fills the technical gap in the detection of the phenol content of the iron-dextran preparation in China, and has a good application prospect. And a brand new solution is provided for veterinary drug production quality control and related detection work.

The invention relates to a high-throughput screening method based on starch-iodine chromogenic reaction, which is used for rapidly identifying lactic acid bacteria strains with alpha-amylase inhibitory activity, and belongs to the technical field of microbial engineering and biological medicine. The method comprises the following steps: preparing an MRS solid culture medium containing soluble starch, preparing a flat plate, performing punching treatment, mixing an alpha-amylase solution and a to-be-detected bacterial liquid in an isovolumetric manner, adding the mixture into holes of the flat plate, performing constant-temperature culture at 37 DEG C for 24-48 hours by taking a non-inoculated alpha-amylase solution as a negative control, and detecting the content of the to-be-detected bacterial liquid in the to-be-detected bacterial liquid. After the culture is finished, uniformly dropwise adding an iodine-potassium iodide solution on the surface of the culture medium for chromogenic reaction, and judging the alpha-amylase inhibitory activity of the strain by observing the formation condition and the diameter of a transparent circle around a bacterial colony. The method has the advantages of simplicity and convenience in operation, rapidness in detection, intuitive result, safety, environment friendliness and the like, is suitable for screening the alpha-amylase inhibitory activity of various lactic acid bacteria and other microorganisms, and provides an efficient and reliable technical scheme for developing a probiotic preparation with a hypoglycemic function; the important application value is realized in the aspects of prevention and treatment of related diseases such as diabetes mellitus.

The invention relates to the technical field of chemical synthesis of pesticides, in particular to a preparation method of a key intermediate-3-iodine-5, 5-dimethyl-4, 5-dihydroisoxazole of a high-efficiency herbicide pyroxasulfone, which comprises the following steps: by taking glyoxylic acid and hydroxylamine hydrochloride as initial raw materials, carrying out oximation reaction to obtain glyoxylic acid oxime; then efficiently completing an iodination reaction through a potassium iodide / iodine elementary substance system under a mild condition, and controlling the reaction process to reduce the generation of byproducts so as to obtain high-purity diiodoformaldoxime; and finally, carrying out addition reaction with isobutene under the condition of normal pressure to finally obtain the target product with high purity and high yield. The core innovation point of the invention is to develop and verify multiple types of novel iodination catalysts, solve the problems of excessive iodine source, poor selectivity and long reaction period in the traditional iodination reaction, and realize collaborative improvement of reaction efficiency, selectivity and economy. The method has the characteristics of more efficient route, more controllable conditions, safer operation, further improvement of yield and purity, higher cost advantage and the like, and the industrial application value is remarkably enhanced.

The invention discloses a rubber accelerator 3-methylpiperidinyl dithio sulfenamide piperazine as well as a preparation method and application of the rubber accelerator 3-methylpiperidinyl dithio sulfenamide piperazine. The method comprises the following steps: dissolving anhydrous piperazine in absolute ethyl alcohol under a stirring condition, adding an aqueous solution containing sodium hydroxide, stirring at room temperature, cooling, adding carbon disulfide stored in absolute ethyl alcohol, stirring, adding a proper amount of 4-methylpiperidine into the system, standing, dropwise adding iodine and potassium iodide which are dissolved in deionized water, continuing to react after the addition is completed, filtering, washing, and drying to obtain the 4-methylpiperidine. And filtering with deionized water, drying and crushing. The accelerator 3-methylpiperidyl dithiosulfenamide piperazine prepared by the invention has the characteristics of high vulcanization rate of a dithiocarbamate accelerator and moderate scorch period of a sulfenamide accelerator, and can solve the problem of rapid vulcanization of ethylene propylene diene monomer.

The application discloses a kind of based on physical-chemical synergistic foaming ultra-light thermal insulation material and preparation method thereof, belong to building thermal insulation material technical field.The ultra-light thermal insulation material based on physical-chemical synergistic foaming of the application, by weight parts, including the following components: light-burned magnesium oxide: 28-37 parts, magnesium sulfate heptahydrate: 18-26 parts, foaming agent: 3.6-5.4 parts, thickening agent: 4.1-5.7 parts, modifier: 0.1-0.4 parts, hydrogen peroxide: 1.5-2.3 parts, potassium iodide: 0.6-1.3 parts, water 45-58 parts.The light thermal insulation material of the application is greatly reduced to 60-80kg / m 3 , and 7d strength is greater than or equal to 100kPa, A-grade non-combustible, thermal conductivity is less than or equal to 0.038W / (m·K), effectively solve the problem that the specific gravity of existing cement-based thermal insulation material is high and thermal conductivity is large, greatly improve the popularization and application of cement-based thermal insulation material.

The present application relates to the technical field of wound gel, in particular to a kind of wound antibacterial disinfectant gel and preparation method thereof.Preparation raw materials of the wound antibacterial disinfectant gel include the following components by weight: PCA-HBPG 4-6 parts, modified chitosan 6-9 parts, 3-amino phenylboric acid 1.5-2 parts, iodine 0.6-0.9 parts, potassium iodide 1.2-1.8 parts, curcumin 0.8-1 part, and the prepared antibacterial disinfectant gel has good bacteriostatic effect, and can promote wound healing.

The invention discloses memantine hydrochloride and a production method and application thereof.The production method comprises the following steps that S1, 1, 3-dimethyladamantane is added into a reaction kettle, bromine is dropwise added into the reaction kettle from a head tank, after the reaction is finished, redundant bromine is evaporated out for reuse, bromine is recycled under negative pressure, and bromination product reaction liquid is obtained; s2, transferring the reaction solution in the previous step to a neutralization kettle, and adding sodium hydrogen sulfite until the reaction solution is colorless or faint yellow; s3, pumping the 1-bromine-3, 5-dimethyladamantane crude product into the kettle, and carrying out rectification collection, so as to obtain a 1-bromine-3, 5-dimethyladamantane finished product; s4, mixing the 1-bromo-3, 5-dimethyladamantane finished product with excessive liquid ammonia in a solvent, and adding a catalyst system and potassium iodide to obtain a 1-amino-3, 5-dimethyladamantane crude product; and S5, dissolving the crude product in ethanol, dropwise adding concentrated hydrochloric acid to adjust the pH value to 2-3, separating out a white solid, and recrystallizing and purifying to obtain the high-purity memantine hydrochloride.

The invention provides for compositions comprising lactoperoxidase and one or more iodide salts for treating watery mouth disease in Lambs; wherein the composition doesn’t comprise a peroxide or a sou

The invention relates to a tebuconazole synthesis method, and belongs to the technical field of organic synthesis, the method flow comprises the following steps: Step 1: adding 1, 2, 4-triazole, DMF or NMP as a solvent, sodium hydroxide alkali liquor or potassium hydroxide alkali liquor, sodium iodide or potassium iodide as a catalyst and pentanone into a reaction flask, and heating to 80-90 DEG C; 2, methylation reagents are added in batches, the methylation reagents are preferably dimethyl sulfide sulfuric acid dimethyl ester onium salt, after addition is completed, heat preservation stirring is conducted, and the heat preservation time is 1-2 hours. P-chlorobenzyl cyanide and cyclopropyl methyl ketone are used as main raw materials, p-chlorobenzyl cyanide is subjected to halogenation at a benzyl position and then subjected to a Darzen reaction with cyclopropyl methyl ketone under the alkaline condition of potassium hydroxide to obtain an epoxide, a target product is obtained through one-pot cyano hydrolysis and deacidification under the acidic condition of sulfuric acid, the synthesis route is short, the process is simple, the raw material cost is low, and the method is suitable for industrial production. The process is simple and smooth, green and environment-friendly, and suitable for industrial large-scale production.

The invention discloses a special fertilizer for drynaria fortunei planting and a preparation method thereof. The special fertilizer comprises a leaf fertilizer for drynaria fortunei spraying and an organic biological enzyme water-soluble fertilizer for drynaria fortunei rhizome, the spraying leaf fertilizer is prepared from the following raw materials: potassium nitrate, ammonium nitrate, magnesium sulfate heptahydrate, monopotassium phosphate, calcium chloride dihydrate, manganese sulfate tetrahydrate, zinc sulfate heptahydrate, boric acid, potassium iodide, sodium molybdate dihydrate, copper sulfate pentahydrate, cobalt chloride hexahydrate, ferrous sulfate heptahydrate and ethylenediaminetetraacetic acid; the organic biological enzyme water-soluble fertilizer is prepared from the following raw materials: rapeseed cakes, melons and fruits, plant ash, soybean meal, industrial brown sugar, a microbial agent, proteolytic enzyme and cellulase. The leaf fertilizer is used for spraying leaf surfaces of drynaria fortunei seedlings, the organic biological enzyme water-soluble fertilizer is used for irrigating rhizomes of drynaria fortunei, growth of the drynaria fortunei seedlings can be effectively promoted, and it can be calculated according to the stem weight that the fresh weight of the drynaria fortunei seedlings per mu can reach 1252.4 kg or above under the condition that the seedlings are 10000 per mu.

The invention discloses an acidic sulfate system electrocoppering combined additive for conformal electroplating of PCB through holes, and relates to the technical field of electronic electroplating, the combined additive is composed of a bridging agent, an inhibitor, a brightener and a leveling agent, and the mass ratio of the bridging agent to the inhibitor to the brightener to the leveling agent is (40-100): (20-1000): (0.1-20): (0.1-100); the bridging agent is one or a combination of more of sodium chloride, hydrochloric acid, potassium bromide and potassium iodide; according to the acidic sulfate system electrocoppering combined additive for PCB through hole conformal electroplating, inorganic matter providing halogen anions serves as a bridging agent, a polyol or polyether compound serves as an inhibitor, a sulfur-containing compound serves as a brightening agent, an organic compound with a specified structure serves as a leveling agent, and the acidic sulfate system electrocoppering combined additive for PCB through hole conformal electroplating is prepared. And in combination with conditions of specific plating solution concentration, temperature, electroplating current density and the like, uniform electroplating of the PCB through hole is realized.

The present invention belongs to the technical field of organic compounds, and specifically relates to a binuclear macrocyclic metronidazole metal complex and its preparation method and application. The preparation method: (1) 2-Pyridinecarboxylic hydrazide, potassium hydroxide and carbon disulfide are subjected to a reflux reaction to obtain 5-(pyridin-2-yl)-1,3,4-oxadiazole-2-thiol; (2) Metronidazole is subjected to a first reflux with triethylamine and p-toluenesulfonyl chloride respectively, and then subjected to a second reflux with potassium iodide to obtain 1-(2-iodoethyl)-2-methyl-5-nitro-1H-imidazole; (3) The products obtained in (1) and (2) are subjected to a reflux reaction, and then dissolved in an organic solvent containing a silver salt to obtain a binuclear macrocyclic metronidazole metal complex. The binuclear macrocyclic metronidazole metal complex of the present invention can further improve the antibacterial effect of the current metronidazole metal complex; and the preparation method is simple and easy to operate, convenient for purification, and the obtained product has good stability in the air.

The invention provides a method for detecting reducing sugar in fermented grains based on a titrator, which is used for quantitatively analyzing reducing sugar in a fermented grain sample by adopting a full-automatic potentiometric titration technology in combination with an accurate chemical analysis method, and specifically comprises the following steps: S1, preparing an instrument and a reagent; preparing instruments and reagents required by detection; s2, preparing a solution; preparing a sodium thiosulfate standard solution, a sulfuric acid solution, a potassium iodide solution, a solution A and a solution B for later use; s3, sample treatment; treating a to-be-detected sample for later use; s4, determining the content of reducing sugar in the fermented grains through a full-automatic potentiometric titration method; sequentially carrying out pre-titration, blank titration and sample titration, and calculating to obtain a final result. The method has obvious advantages in the aspects of data management, operation convenience and the like, and can replace a manual titration method to be applied to determination of the reducing sugar content in the fermented grains.