434results about "Analysis using chemical indicators" patented technology

Microparticles for detecting biological materials are provided. Each of the microparticles includes: a core-shell structured microparticle consisting of a core including a magnetically responsive metal and a shell layer surrounding the core and having a uniform thickness; and capture probes introduced onto the shell layer to capture biological materials.

The present invention belongs to the technical field of mechanochromic materials, and specifically relates to a mechanochromic material containing rhodamine with a hydantoin structure, and its preparation method and application. The rhodamine mechanochromic material containing a hydantoin structure is shown in structure (I), with rhodamine B as the matrix, reduced to rhodamine alcohol, oxidized to generate rhodamine aldehyde, and reacted with hydantoin to prepare a six-membered spirocyclic rhodamine containing a hydantoin structure. The rhodamine compound containing a hydantoin structure involved in the present invention has good ion interference resistance, exhibits photochromic properties in a dichloromethane solvent, and has the properties of mechanical stress discoloration and solvent mixing stress discoloration with high contrast and good repeatability. The solid powder of the rhodamine mechanochromic material containing a hydantoin structure has the characteristic of changing color upon grinding. After the action of mechanical force, the color of the powder changes from yellow to pink, and a reversible color change is achieved during the grinding-heating process.

A marker composition for application to a medical device or a surface is disclosed. The marker composition comprises a carrier composition including water, nonionic surfactant, organic solvent, and a neutral or anionic viscosity modifier. The marker composition further comprises a dyestuff. In some embodiments, the quantity of dyestuff present is such that at least some of the dyestuff is present as a dispersed solid phase. The dyestuff may be a naturally-derived dyestuff, such as spirulina extract (including phycocyanin). The invention extends to a carrier composition for a dyestuff.

The invention relates to the technical field of environmental analytical chemistry, and discloses a thymol phenolphthalein-TBPE double indicator-based cyanide titration detection method and system, and the method comprises the following steps: adjusting a water sample to be detected to an alkaline pH interval to construct a detection matrix; the method comprises the following steps: introducing a double-indicator system composed of thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester according to a specific ratio into a detection matrix, and constructing a spectrum background for masking yellow interference of sulfide by utilizing the blue color development characteristic of thymol phenolphthalein; dropwise adding a silver nitrate standard solution into the mixed system to execute a complex reaction; according to the method, a spectrum background shielding field is constructed, chromaticity response of a system in a specific wave band is monitored in real time, and when a chromaticity mutation signal from green to bluish violet is captured, a titration end point is judged, and the cyanide concentration is calculated. High-precision anti-interference detection on cyanide in a complex high-turbidity matrix is realized, and the sensitivity and accuracy of end point recognition are improved.

Marker composition comprising water, 1-10 wt.% non-ionic surfactant selected from alkyl polyglucosides, alcohol ethoxylates and alcohol ethoxylate propoxylates, or mixtures thereof, 1-5% organic solve

Devices to detect analytes (e.g., charged species such as ions) in samples are provided as are methods for their use. The devices comprise a tube or container comprising a water-immiscible sensing oil phase comprising at least one sensing chemical that binds the at least one analyte. The tube further receives an aqueous sample. Upon mixing of the two immiscible phases, the analyte partitions into the oil phase and binds to the sensing chemical, delectably changing the optical properties of the sensing chemical (or of an associated reporter molecule). Detection of the changes permits quantification of the amount or concentration of analyte in the sample without optical interference from the sample. The devices are suitable for home use and other decentralized settings.

The invention discloses a testing device which comprises a cavity used for receiving a liquid sample, a cover body, the cover body is used for sealing the cavity, the cover body further comprises a carrier with a groove, the carrier is used for receiving and holding a test strip, the cover body further comprises a hole, the hole is communicated with the groove, and the hole is communicated with the groove. The cover body is provided with a mark, the connecting line between the mark and the hole is the shortest distance, and when a test is carried out, the mark is set to indicate an inclined direction, so that a liquid sample is in contact with a test area of the test strip in the groove, and by adopting the device, the test can be rapidly carried out, the operation is simple and convenient, and the test efficiency is improved. And the test result is more accurate.

A portable device which detects a Raman signal from an analyte of interest contained in or suspected to contain in a sample. The portable device includes a laser source in optical communication with a dichroic mirror, an objective lens optically positioned to consolidate the laser from the laser source to the sample, (i) a pair of rotatable filters in optical communication with the dichroic mirror and an optical transmission module or (ii) a first band-pass filter in optical communication with the dichroic mirror and an optical transmission module, and a detector optically positioned to receive and detect a Raman signal produced from the laser incident on the analyte of interest. The dichroic mirror directs the laser from the laser source to the sample through the objective lens and transmits any Raman signal from the sample toward the detector. The detector is absent of a spectrometer and detects the Raman signal.

Disclosed is use of a compound of formula (I) to determine the quantity of clay in a sand and / or to determine the amount of CMA compound to be added to a hydraulic binder composition using a sand:R1—(OA)n—XR2  (I)where: R1 is a linear or branched C1 to C4 alkyl groups, or a coloured compound; R2 is a coloured compound; A, each the same or different, are independently a —CH2—CH2— group or —CH(CH3)—CH2— group; n is an integer of between 1 and 500, preferably between 4 and 250; and X is O or NH.

The use of halogen / hydrogen bonding receptors for sensing sulfur mustard and its derivatives are described.

The present invention discloses a rapid hydrogen peroxide test kit and a method of using the same, the rapid hydrogen peroxide test kit comprising a sample diluent and a test strip containing a chromogen for detection and a chromogen for quality control in a dry environment. The sample diluent comprises 100-500 mM ammonium oxalate, 0.3-2.0 mM 8-hydroxyquinoline, 50-500 mM sodium chloride, and 10-100 mM of a first pH adjuster for pH 4.5-7.0.

An embodiment provides a method for measuring arsenic in a sample, showing marked increase in sensitivity over previous methods including: preparing a compound of metal-plated zinc and zinc; introducing the compound to an acidified sample, wherein the sample contains an amount of arsenic, wherein the compound reduces the amount of arsenic to produce arsine gas; wherein sufficient hydrogen gas is produced to purge the sample solution; wherein the arsine gas is completely purged from the sample and captured on a test pad, wherein the pad comprises mercuric bromide, wherein the capturing produces a color change of the pad; and measuring the amount of arsenic in the sample by measuring the color change of the pad. Other aspects are described and claimed.

An embodiment provides a method for measuring an ion component of an aqueous sample using a photoreactive species, including: generating a metal organic framework by combining, in a reactive solution, at least one organic linker and at least one metal; impregnating the metal organic framework with the photoreactive species; introducing the impregnated metal organic framework into an aqueous sample; and measuring an analyte component concentration of the aqueous sample, wherein the measuring comprises measuring a change in the aqueous sample, wherein the change is responsive to the analyte component dissolving at least one of: the at least one organic linker and the at least one metal, and releasing the photoreactive species. Other embodiments are described and claimed.

Compositions, articles, systems, and methods for the detection of fluorocarbons are generally described. In certain embodiments, for example, sensing materials are described that include a bound multichromophore. The bound multichromophore can be capable of energy transport and / or diffusion between individual moieties of the bound multichromophore. In certain embodiments, for example, the bound multichromophore includes individual moieties that are linked via delocalized orbitals, such that the bound multichromophore is capable of energy transport and / or diffusion through each individual moiety of the bound multichromophore. Sensing materials that include bound multichromophores can be configured to detect the presence of an analyte, such as a fluoroalkyl species (e.g., perfluoroalkyl and / or polyfluoroalkyl materials). For example, in some embodiments, the bound multichromophore includes at least one chromophore that exhibits a change in electromagnetic radiation (e.g., light) emission in response to the presence of the analyte.

A method for determining soluble aldehydes in a composition comprising one or more of (a) 2,5-furan dicarboxylic acid (FDCA), (b) terephthalic acid (TPA), (c) an ester of 2,5-furan dicarboxylic acid, and (d) an ester of terephthalic acid is described. The method can indicate even very low levels of soluble aldehydes associated with unacceptable color development in a) the composition, b) a portion of the composition, or c) a prepolymer, oligomer, or polymer at least partially prepared directly or indirectly from the composition or a portion of the composition, so that mitigating or improving measures can be taken in response.

The present invention relates to a washer for a secondary battery including a film layer and an adhesive layer disposed on at least one surface of the film layer, wherein the adhesive layer includes an adhesive component and an indicator component, and the indicator component is fat-soluble, a secondary battery including the same, and a method for manufacturing the washer.

A water quality testing method and a water quality testing apparatus. The testing method comprises: obtaining, in a first environment, a testing sample including a target testing object (S101); selecting a reference object according to the testing sample (S102), and respectively acquiring the chroma of the reference object in a second environment and in the first environment; constructing a correction model according to the chroma of the reference object in the second environment and in the first environment (S103); obtaining the chroma of the testing sample in the first environment (S104); according to the chroma of the testing sample in the first environment and the correction model, obtaining the chroma of the testing sample in the second environment (S 105); and according to a preset standard curve and the chroma of the testing sample in the second environment, obtaining the concentration of the target testing object in the testing sample (S106). The method is simple, has a high testing speed, has a wide application range, is independent of specific photographing conditions, has good applicability and stability for different photographing devices, light sources and photographing methods, and has a high testing accuracy.

The application relates to the technical field of water quality detection, in particular to a water-nitrogen element detection device which comprises a placing platform, a mixing mechanism, a comparison mechanism, a filtering mechanism and a detection mechanism, the mixing mechanism, the comparison mechanism, the filtering mechanism and the detection mechanism are all placed on the top of the placing platform, further comprises two pipe clamps, the mixing mechanism comprises a mounting frame and a fixed plate, the outer wall of the fixed plate is provided with a sliding hole, the two pipe clamps penetrate through the sliding hole, and the two pipe clamps are slidingly connected to the inner wall of the sliding hole, the application drives the wire roller to rotate the rotating shaft by pulling the pull ring and the soft rope, and the test tube is reset under the action of the torsional spring when the pull ring is released, so that the purpose of driving the test tube to shake is achieved, the purpose of mixing the solution in the test tube is achieved, the shaking range is stable, shaking is convenient, and the test tube can be tilted by pulling the pull ring when the solution is dipped, so that the operation is convenient.

The present invention relates to a portable sugar test strip which can be easily carried by diabetic patients and the like to test the presence or absence of sugar. The portable sugar test strip for diabetic patients according to the present invention is characterized by comprising: a vertically elongated rectangular substrate part (10); a reagent reaction part (20) formed on one side of the substrate part (10) by applying a reagent that changes color in response to sugars; and a tactile part (30) formed closer to the center of the substrate part (10) than the reagent reaction part (20) to absorb or collect beverages.

In this invention, selection of a coloring agent and an auxiliary material is made easy, and detection performance in a case of targeting a solid metal is thereby improved.　This reagent is used for detecting an element contained in a test object, which is a solid metal such as a copper alloy. The reagent comprises: an organic coloring agent such as xylenol orange; a keeping agent for keeping a state of adhesion to the test object; and a coloration visibility improving agent for improving visibility of coloration of the organic coloring agent with respect to a background color of the test object. The reagent also comprises a pH adjusting agent, whereby the pH is adjusted to 0 or more.

An apparatus for prolonging the stability of a liquid analytical reagent, even under high temperature storage is provided. The apparatus includes a first barrier (102) forming all or a portion of an exterior of the apparatus, and a second barrier (104) forming all or part of a second section within the apparatus. The first barrier (102) includes a material having a permeability to oxygen of less than 50 cc / m2 / 24 hours, and the second barrier (104) includes a material having a permeability to oxygen of 50 cc / m2 / 24 hours or more. A liquid analytical reagent (114) is contained within the second section and an oxygen scavenger (120) is separated from the liquid analytic reagent by the second barrier.

This invention relates to the field of free lithium detection, specifically to a method for detecting free lithium and / or residual alkali in lithium supplements. The method includes the following steps: dispersing the lithium supplement in a solvent to obtain a first mixed system; filtering the first mixed system after allowing it to stand to obtain a filtrate; detecting the lithium ion content and transition metal element content in the filtrate, and calculating the free lithium and / or residual alkali content in the lithium supplement; the water content of the solvent is ≤500ppm. The method for detecting free lithium and / or residual alkali in the lithium supplement significantly reduces testing errors by controlling ambient humidity, solvent water content, and subtracting lithium hydroxide generated from the reaction with water and lithium contained in the lithium supplement passing through a microporous filter membrane.

Disclosed herein are assays, methods, and devices for detecting a target ion via ionophore-based ion-selective sensing using Surface Enhanced Raman Spectroscopy (SERS). For example, disclosed herein are assays for detection of a target ion via SERS, the assays comprising: an ionophore, a nanostructured metal, an ion exchanger, and an indicator, wherein the ionophore comprises a binding portion configured to bind with the target ion, wherein the nanostructured metal is configured to enhance a Raman signal of at least a portion of the indicator, wherein the Raman signal changes when the target ion is bound to the ionophore. Also disclosed herein are methods, for example, comprising contacting any of the assays described herein with a liquid sample; subsequently collecting a surface enhanced Raman signal from the liquid sample and the assay; and processing the surface enhanced Raman signal to determine a property of the liquid sample.

The molecular adsorbent according to the present application adsorbs a polar molecule, and contains, as an active ingredient, an ion exchanger having: an ion exchange resin containing an ion exchange group which is a strongly acidic group; and a metal ion or a complex of a metal ion which is ion-exchanged with the ion exchange group. The polar molecule contains a nitrogen atom having a lone pair of electrons. The metal ion is one or more of a metal ion of 3 valence or more, Co 2+ , Cu 2+ , Ni 2+ , Mn 2+ , V 2+ , Cs + , Rb + , and K + .

The present disclosure relates to methods and kits for detecting free thiols in a substrate, and methods for quantifying the amount of free thiols in a substrate. In particular, the present disclosure provides a fluorescent Ellman's assay for increasing the sensitivity of the detection and quantification of free thiols.

The present invention relates to a method for detecting the possible presence of a chemical conversion layer on a part, comprising at least the following steps: A) a step of bringing at least part of the surface of the part into contact with an oxidizing composition; B) a step of detecting a possible persistent stain at the location of the contact as defined in step A).