433 results about "H2O2 - Hydrogen peroxide" patented technology

Dental bleaching systems that include a bleaching component and a neutralizing component which, when mixed together, yield a mixed composition having a desired bleaching activity and viscosity. The bleaching composition includes a suitable bleaching agent, such as aqueous hydrogen peroxide, in a concentration of about 3% to about 95% by weight of the bleaching composition component. The neutralizing component includes a particulate base dispersed within a stable gel that includes at least one polymeric thickening agent. The neutralizing component is substantially water-free to prevent destruction of the gelling capability of the thickening agent by the base. The particulate base may include oxides, hydroxides or carbonates of alkali metals or alkaline earth metals. Maintaining the bleaching agent and neutralizing agent in separate components provides increased stability during storage and transport.

A method of decontaminating articles, comprising the steps of:

• • (a) moving a plurality of articles having a known temperature along a first path;
  • (b) conveying a carrier gas along a second path that includes an elongated plenum, the second path intersecting the first path downstream from the plenum;
  • (c) heating the carrier gas to a temperature of at least about 105° C. at a location upstream of the plenum;
  • (d) introducing into the carrier gas in the plenum an atomized mist of a liquid hydrogen peroxide of known concentration; and
  • (e) controlling the following:
    • (1) the volumetric flow of carrier gas along the second path;
    • (2) the volume of hydrogen peroxide introduced into the carrier gas; and
    • (3) the temperature of the carrier gas introduced into the plenum, such that the concentration of the vaporized hydrogen peroxide in the carrier gas where the first path intersects the second path has a dew point temperature below the known temperature of the articles.

The present invention provides an assembly for the preparation of a medical device having a porous coating comprising hydrogen peroxide. Particularly interesting medical devices are catheters (such as urinary catheters), endoscopes, laryngoscopes, tubes for feeding, tubes for drainage, guide wires, condoms, urisheaths, barrier coatings e.g. for gloves, stents and other implants, extra corporeal blood conduits, membranes e.g. for dialysis, blood filters, devices for circulatory assistance, dressings for wound care, and ostomy bags. The coating is in particular a hydrophilic coating formed from cross-linked polyvinylpyrrolidone. In one embodiment, the assembly holds a dry catheter element in one compartment of a package and an aqueous hydrogen peroxide solution in another compartment. The solution may also comprise stabilizers, e.g. chelators, and osmolality increasing agents. The catheter for insertion in the urethra is useful for the treatment, alleviation or prophylaxis of microbial infections such as urinary tract infections (UTI).

The invention discloses a mercury-ion detection method simulating peroxidase based on nano platinum and a kit. After the specificity interaction of the nano platinum and mercury ions, the inhibition variation of the activity of the perioxidase is simulated, hydrogen peroxide is catalyzed by the nano platinum to oxidize 3, 3', 5, 5'-TMB HCL to achieve color developing. The invention provides a novel rapid, simple and ultrasensitive mercury ion detection method. The nano platinum used in the detection method is simple to prepare and easy to obtain, and visualized and convenient analysis on the mercury ions can be realized. The detection method has the advantages of simplicity in operation, short detection time, high sensitivity, high specificity and the like and is easy to popularize and use.

The invention discloses a method for quickly determining residual hydrogen peroxide. According to the method, residual hydrogen peroxide in a to-be-determined sample is quickly determined by detection paper; the method capable of quickly detecting the content of residual peracetic acid in the sample on site is good in stability, easy and simple to operate, economical, practical, short in response time and high in sensitivity; and the lowest detected content of hydrogen peroxide is 0.5mg/L. In addition, the method can be widely applied to the industries of food, daily chemical and medical treatment, and can quickly and effectively monitor the content of residual hydrogen peroxide in various disinfected or bleached samples.

A decontamination system for decontaminating a region with a vaporized decontaminant, such as vaporized hydrogen peroxide. The concentration of the vaporized decontaminant within the region is modified in response to operating conditions. The decontamination system adjusts the concentration of the vaporized decontaminant in response to the monitored saturation concentration of the decontaminant, thereby preventing condensation of the vaporized decontaminant during a decontamination cycle. The decontamination system also adjusts the concentration of the vaporized decontaminant in order to minimize the time required to complete a successful decontamination operation.

The invention discloses a stepped method for detecting the concentration of a hydrogen peroxide solution. The stepped method includes the following steps that 1, a photothermal conversion material reacting with hydrogen peroxide is used for modifying a nanometer material containing a rare earth element, so that a functional rare earth nanometer material is obtained; 2, a series of hydrogen peroxide solution with the standard concentration reacts with the functional rare earth nanometer material to obtain a series of mixed solution, the luminous intensity, ultraviolet-visible light absorption intensity and photo-thermal heating temperature of the mixed solution are detected, and a standard curve of the luminous intensity, ultraviolet-light absorption intensity, heating temperature and concentration is drawn; 3, the hydrogen peroxide solution with unknown concentration reacts with the functional rare earth nanometer material to obtain a mixed solution, a detecting mode is determined, corresponding data is determined, and the concentration can be obtained through comparison with the standard curve. The detection limit is effectively lowered, and meanwhile the linear detection range is promoted. The material is simple, an instrument is low in price, and the stepped method can be used for detecting foods, medicine, living body samples and other samples.

The invention relates to a configuration of an air diffusion cathode for efficiently producing hydrogen peroxide and a preparation method thereof. The method mainly comprises the following steps: coating a carbon fiber by using a mixed solution of polytetrafluoroethylene and carbon black, so as to prepare an air cathode sheet, and then assembling the air cathode sheet according to a certain configuration. The air diffusion cathode has good H2O2 yield and current efficiency, is low in requirements of air aeration quantity, convenient to run, small in energy consumption, low in price, and stable in property, selects a carbon fiber and a carbon black material, and has high practical application value.

The invention discloses a preparation method of a difunctional hydrogen peroxide non-enzymatic sensor built based on a two-dimensional composite material. The prepared sensor is easy to operate, convenient to carry, high in detection speed, low in cost and capable of being used for rapidly and sensitively detecting hydrogen peroxide in the field of daily production, life and the like.

This invention discloses a method for preparing low-sulfur diesel oil (sulfur content is less than 50 ppm). The method comprises: (1) stirring hydrogenated or unhydrogenated diesel oil and a mixture of Q+[MWxOy]- emulsion catalyst and H2O2 aqueous solution, and reacting under mild conditions to convert organic sulfide in diesel oil into sulfone and/or sulfoxide to obtain oxidized diesel oil; (2) separating the catalyst from oxidized diesel oil, and recovering; (3) washing oxidized diesel oil with distilled water, and removing most of sulfone and/or sulfoxide with a polar solvent to obtain low-sulfur diesel oil (sulfur content is less than 50 ppm).

The invention relates to a method for testing hydrogen peroxide in a cell based on a horseradish peroxidase-attapulgite nanometer composite material; the method comprises the following steps: horseradish peroxidase is adsorbed on the surface of purified attapulgite so as to prepare the horseradish peroxidase-attapulgite nanometer composite material; a dispensing method is used for applying the composite material to the surface of a glassy carbon electrode so as to construct a horseradish peroxidase-attapulgite nanometer composite material biological sensor; the sensor is used as a working electrode; and a chronoamperometry is used for detecting H2O2 in the cell. The biological sensor adopted by the method for testing the hydrogen peroxide in the cell has good electrical catalytic activity on hydrogen peroxide, can be applied to the detection of H2O2 in the cell and has the advantages of fast response, wide linear range, low detection limit, good repeatability and the like; and a new electrochemistry method based on enzyme sensing for detecting H2O2 in the cell is established.

The invention discloses a disinfectant for cleaning and disinfecting a hemodialysis machine. The disinfectant contains the following components by weight percent: 0.5%-1.0% of peracetic acid, 2.0%-5.0% of hydrogen peroxide, 0.1%-0.5% of pyridine-2-formic acid, 0.01%-0.05% of sodium citrate, 0.2%-2.0% of sodium dichloroisocyanurate, 0.05%-1.0% of sulfamic acid and the balance being water. A preparation technology of the disinfectant is simple, the disinfectant is convenient to use, the technological conditions are easy to achieve and the product stability is good.

The invention relates to a method for testing the lead content in copper by inductively coupled plasma emission spectrometry, which comprises: firstly, dissolving a copper sample in a proper amount of hydrochloric acid and hydrogen peroxide, and washing with 4 percent HCl till copper ions are removed completely; and secondly, preparing standard solution which is used for measuring a standard factor and a calibration factor. An analytic spectral line selected in analytic measurement is Cu222.778 (150) and Pb220.353 (152). In the invention, the instrument operation parameters are measurement conditions of infrared interferometer spectrometer (IRIS) inductively coupled plasma (ICP) whole-spectrum direct-reading spectrometer (from Thermo Electron), which are as follows: the integration time is 25 seconds for long waves and 5 seconds for short waves; the sample washing time is 30 seconds; the high-frequency output power is 1,150W; the atomization pressure is 20Psi; the auxiliary air flow is 0.5L/min; the pumping speed is 100rpm; and the atomizer position is 7mm. The invention has the advantage that the detection method has the characteristics of simplicity, convenience, quickness and accuracy and has high stability.

The invention discloses a manufacture method of a gold plated copper thermode and application of the thermode on a temperature-controllable H2O2 sensor, comprising manufacture of the gold plated copper thermode, formation of a G-quadruplex-hemin complex and a high-sensitivity detection method for hydrogen peroxide by an electrochemical sensor based on the thermode and the G-quadruplex-hemin complex. Based on the high-temperature resistance feature of G-quadruplex-hemin DNA (Deoxyribonucleic Acid) enzyme, electrochemical catalysis response of the hydrogen peroxide on the sensor increases gradually with temperature rising (0-50 degrees centigrade). The electrochemical hydrogen peroxide sensor based on the thermode and G-quadruplex-hemin DNA enzyme provided by the invention can be used in a wide temperature range, has high sensitivity and can realize rapid detection on hydrogen peroxide.

The invention discloses a hydrogen peroxide measurement method based on N-acetyl-L-cysteine-gold nanoclusters, and relates to a hydrogen peroxide measurement method which takes the gold nanoclusters protected by N-acetyl-L-cysteine as a fluorescent probe. The method is characterized in that the fluorescent light of the gold nanoclusters is quenched by utilizing hydroxyl radicals generated by catalyzing H2O2 through Fe<2+>, so that the characteristic of a fluorescence emission spectrum is changed, and the method can be used for detecting H2O2. Delta F650 and the concentration of H2O2 have a linear relation within the range of 0.044-6.66 micromole/ L, and the limit of detection is 27 nmol/ L. The method is high in sensitivity and good in reproducibility, and can be used for measuring H2O2 in food, industry, environment and a living system.

The invention discloses a preparation method, a product and application of a CuS/GO/MWCNTs composite nanoparticle modified electrode. The method includes the steps that a multi-wall carbon nanotube isactivated, wherein the multi-wall carbon nanotube is activated in an H2SO4/HNO3 mixed solution, diluted, filtered and dried; a CuS/GO/MWCNTs composite material is prepared, wherein the activated multi-wall carbon nanotube is weighed and dissolved in water, graphene oxide colloidal sol is added, a uniform solution is obtained through ultrasonic dispersion, copper nitrate, polyvinylpyrrolidone andthiourea are added, stirring is performed, heating is performed for a reaction, after the reaction is ended, cooling, rinsing and drying are performed, and the CuS/GO/MWCNTs composite material is obtained. With the CuS/GO/MWCNTs composite nanoparticle modified electrode, the effect of detecting hydrogen peroxide is quite good, the threshold of detection is 0.6 microns, the linear detection range is 0.45-60 millimeters, the application potential is lower than 0.31 V, and the detection sensitivity is up to 386 microamperes/{millimeter*centimeter <2>}.

The invention discloses a method and device for preparing an electrocatalytic H2O2 solution. The preparation method comprises the following steps: (1) electrolyzing water at an anode to generate H<+> and O2, and electrolyzing oxygen at a cathode to obtain HO<2->; (2) allowing H<+> and HO<2-> to enter a solid electrolyte layer respectively through a cation exchange membrane and an anion exchange membrane to directly synthesize H2O2; and (3) introducing water into the solid electrolyte layer, and taking out H2O2 by utilizing the water. The device comprises the anode, the cathode and a storage tank, wherein the solid electrolyte layer is arranged between the anode and the cathode, the storage tank is connected to the solid electrolyte layer, an anode flow channel, an anode collector plate, a gas diffusion layer, an anode catalyst layer and a cation exchange membrane are sequentially arranged in the anode, and the IrO2/GCN cation exchange membrane is tightly attached to the surface of the solid electrolyte layer. According to the preparation method, water and oxygen are used as raw materials, and no organic solvent is added, so a preparation process is green and environmentally friendly; and high-concentration hydrogen peroxide can be directly generated and purification is not performed, so the risk of the preparation process is reduced.

The invention relates to a method for quickly measuring the content of sulfur dioxide in bergamot fruits by using a Kjeldahl apparatus. Aiming at the defects of low distillation speed, low efficiency and the like in measurement of the sulfur dioxide in the bergamot fruits in the prior art, the inventor invents a simple, quick and accurate method for quickly measuring the content of the sulfur dioxide in the bergamot fruits by using the Kjeldahl apparatus. Especially, compared with the prior art, the measuring efficiency of the method of the invention is improved by more than 5 times. The method of the invention mainly comprises the following steps: carrying out distillation by using the Kjeldahl apparatus, wherein the distilling process can be finished only in 10min; then, absorbing the released SO2 by neutral H2O2 by a hydrogen peroxide absorption method; titrating the released SO2 with a NaOH standard solution; measuring a terminal point by an acidity meter; and computing the content of the SO2 in the sample according to the volume of consumed NaOH.

The invention discloses a device capable of producing hydrogen peroxide and application of the device, and belongs to the technical field of oxidants. According to the device, O2 can be provided for cathode reaction by using microalgae photosynthesis to achieve the production of the hydrogen peroxide, external aeration is not needed, the energy consumption is reduced, and microalgae production canbe achieved by the device. By producing the hydrogen peroxide for 8 days by using the device, the oil yield can be allowed to reach up to 656 mg/L d in a microalgae growing chamber, the accumulationconcentration of H2O2 in a cathode chamber is 180 mg/L, the effect is excellent, and the application prospects are wide.

A liquid formulation of an ophthalmic drug in a pre-filled pharmaceutical package, for example a syringe, cartridge, vial or any other vessel made in part or in whole of a thermoplastic polymer, coated on the interior with a tie coating or layer, a barrier coating or layer, a pH protective coating or layer, and optionally a lubricity coating or layer. A blister, a pouch, a bag, a tray or a tub may encompass as a secondary packaging the syringe, vial, cartridge, tube or any other vessel. The package is suitable for sterilization (e.g., surface and/or terminal sterilization) with sterilization gas residuals being minimal and/or lower than required by ISO 10993-7; and/or the stability of the ophthalmic drug is maintained, during a prolonged time period following the sterilization. The sterilization gas may be EO, propylene oxide, chlorine dioxide, nitrogen dioxide, or vaporized hydrogen peroxide (VHP), among others.