Abstract: Provided are a synchronous fluorescence detector for observing the interface concentration of fluorescent pollutants and application method. The detector comprises a first electric displacement platform, a quartz cuvette, an excitation light path, a collection light path and a second electric displacement platform. The application method comprises the following steps: first exciting fluorescent pollutants by utilizing UV light with specific wavelengths to emit fluorescent light; then collecting fluorescence signals emitted by the excited fluorescent pollutants to the greatest extent by utilizing an UV anti-reflection convex lens combination; and finally, processing the fluorescent signals acquired by a photomultiplier by utilizing a difference method to determine a precise light intensity of a thin layer which is moved at a specific spacing by utilizing the electric displacement platforms so as to determine fugacity distribution of the fluorescent pollutants in the microlayer near an interface.

Abstract: Disclosed herein are methods of analyzing a biological sample comprising: separating components of the biological sample via reversed-phase (RP) chromatography to obtain an elute; subjecting the elute to separation via ion-exchange (IEX) chromatography or mixed-mode IEX chromatography; and detecting the separated compounds to determine the components of the biological sample. Also disclosed are devices comprising a reversed-phase (RP) chromatography column in communication with an ion-exchange (IEX) chromatography column or mixed-mode IEX chromatography column, wherein there is no switching valve between the columns.

Abstract: According to one embodiment, an apparatus for maintaining liquid membrane includes a liquid supply unit which supplies a liquid onto a sensor element and forms a liquid membrane, and a liquid discharge unit which discharges the liquid in the liquid membrane.

Abstract: Provided is a method for quantifying vitamin D, with the vitamin D contained in a biological sample being derivatized with a derivatization reagent and being measured with a mass spectrometer, the method including, a derivatization step of derivatizing n number of samples by using n types of 4-(4?-dimethylaminophenyl)-1,2,4-triazoline-3,5-dione (DAPTAD) isotopologues respectively as derivatization reagents, a mixing step of mixing the n types of derivatization samples obtained in the derivatization step, and a quantitative analysis step of subjecting each of the n types of vitamin D derivatives contained in the mixed sample obtained in the mixing step to quantitative analysis using a mass spectrometer.

Abstract: Methods for determining the amount of vitamin D compounds in a sample are provided. The methods can employ LC-MS/MS techniques and optionally the use of deuterated internal standards. Methods for diagnosing vitamin D deficiencies are also provided.

Abstract: A vibrating platform for the deploying of passive sampling devices in sediments and other media to be sampled. The vibrating platform can greatly enhance the rate of mass transfer of analytes, such as polycyclic aromatic hydrocarbons and polychlorinated biphenyls, into passive sampler material by disrupting the formation of a depletion layer in proximity of the passive sampler material.

Abstract: Methods for determining the amount of vitamin D compounds in a sample are provided. The methods can employ LC-MS/MS techniques and optionally the use of deuterated internal standards. Methods for diagnosing vitamin D deficiencies are also provided.

Abstract: In an embodiment, a benzene sensor comprises a substrate having an iodine complex disposed thereon, a radiation source configured to project UV radiation onto the complex, and a UV detector configured to detect a UV reflection off of the substrate having the iodine complex. The iodine complex can include a cyclodextrine-iodine complex such as an alpha-cyclodextrine-iodine complex, a ?-cyclodextrine iodine complex, or any combination thereof.

Abstract: Compounds are provided for the capture of polycyclic aromatic hydrocarbons. The compound is selected from formula (I) and formula (II): The compound includes a salt formed with a suitable counter anion.

Abstract: Methods for determining the amount of vitamin D compounds in a sample are provided. The methods can employ LC-MS/MS techniques and optionally the use of deuterated internal standards. Methods for diagnosing vitamin D deficiencies are also provided.

Abstract: A test sensor includes a body, a first conductive trace, a second conductive trace, and a third conductive trace. The body includes a first region that has a fluid-receiving area, a second region separate from the first region, and a first temperature sensing interface disposed at or adjacent to the fluid-receiving area. The fluid-receiving area receives a sample. The first trace is disposed on the body, and at least a portion of the first trace is disposed in the first region. The second and third traces are disposed on the body. The third trace extends from the first to the second regions. The third trace is connected to the first trace at the first temperature sensing interface. The third trace includes a different material than the first trace. A first thermocouple is formed at the first temperature sensing interface. The thermocouple provides temperature data to determine an analyte concentration.

Abstract: Provided are methods of detecting the presence or amount of a vitamin D metabolite in a sample using mass spectrometry. The methods generally are directed to ionizing a vitamin D metabolite in a sample and detecting the amount of the ion to determine the presence or amount of the vitamin D metabolite in the sample. Also provided are methods to detect the presence or amount of two or more vitamin D metabolites in a single assay.

Abstract: A gas chromatograph includes a sample inlet configured to receive a sample of interest and a carrier gas inlet configured to receive a carrier gas. A plurality of fluid flow valves are operably coupled to the sample inlet and the carrier gas inlet. A detector is operably coupled to the plurality of fluid flow valves and is configured to provide an analytic indication relative to the sample of interest. A controller is operably coupled to the plurality of fluid flow valves and is coupled to memory storing user-configurable information that is accessed by the controller to affect operation of the gas chromatograph.

Abstract: Provided are methods of detecting the presence or amount of a vitamin D metabolite in a sample using mass spectrometry. The methods generally are directed to ionizing a vitamin D metabolite in a sample and detecting the amount of the ion to determine the presence or amount of the vitamin D metabolite in the sample. Also provided are methods to detect the presence or amount of two or more vitamin D metabolites in a single assay.

Abstract: Method for marking a target structure, comprising the following steps: a) providing a compound V that includes at least one dihydroxy- or trihydroxyphenyl group, b) providing a means for converting the dihydroxy- or trihydroxyphenyl group to a quinone group, c) providing a target structure, d) oxidizing the dihydroxy- or trihydroxyphenyl group of the compound V to the quinone group, and e) contacting the compound V with the target structure, so that a covalent bond can be formed, wherein in step e) the compound V is used in a concentration such that the maximum concentration of dihydroxy-, trihydroxyphenyl groups and quinone groups that are introduced by the compound V is ?500 ?M, preferably ?300 ?M, and more preferably ?100 ?M.

Abstract: Nanoporous polymorphic crystals of CaCO3 were used as sorbent and were applied in the dispersive micro-solid-phase extraction of selected polycyclic aromatic hydrocarbons as target analytes. After separation of the analytes on gas chromatography, they were successfully quantified with external calibration using flame ionization detection. Performance of the dispersive micro-solid-phase extraction was compared with a previously optimized solid-phase extraction technique.

Abstract: A test sensor includes a body, a first conductive trace, a second conductive trace, and a third conductive trace. The body includes a first region that has a fluid-receiving area, a second region separate from the first region, and a first temperature sensing interface disposed at or adjacent to the fluid-receiving area. The fluid-receiving area receives a sample. The first trace is disposed on the body, and at least a portion of the first trace is disposed in the first region. The second and third traces are disposed on the body. The third trace extends from the first to the second regions. The third trace is connected to the first trace at the first temperature sensing interface. The third trace includes a different material than the first trace. A first thermocouple is formed at the first temperature sensing interface. The thermocouple provides temperature data to determine an analyte concentration.

Abstract: A sampling system includes an analyte sampler that includes an enclosure; a mount disposed in the enclosure; a capillary tube disposed in the mount; and a thermal member disposed in the enclosure and including a first fluid supply member to provide a fluid to an interior of the enclosure. The sampling system also includes a manifold in fluid communication with the analyte sampler. A process for sampling an analyte includes subjecting the capillary tube to a negative pressure; and controlling the temperature of the capillary tube to immobilize the analyte in the capillary tube; providing an analyte to a second end of the capillary tube; and immobilizing the analyte in the capillary tube to sample the analyte.

Abstract: The invention relates to the quantitative measurement of steroidal compounds by mass spectrometry. In a particular aspect, the invention relates to methods for quantitative measurement of steroidal compounds from multiple samples by mass spectrometry.

Abstract: Nanoporous polymorphic crystals of CaCO3 were used as sorbent and were applied in the dispersive micro-solid-phase extraction of selected polycyclic aromatic hydrocarbons as target analytes. After separation of the analytes on gas chromatography, they were successfully quantified with external calibration using flame ionization detection. Performance of the dispersive micro-solid-phase extraction was compared with a previously optimized solid-phase extraction technique.

Abstract: A high energy UV fiber-coupled laser-induced fluorescence system is provided having a transmission component and a receiving component. The transmission component includes a laser source configured to produce high-energy UV pulses, a UV-enhanced fused-silica fiber coupled to the laser source, and optics coupled to the UV-enhanced fused-silica fiber for transmitting the high-energy UV pulses to a target area. The receiving component receives laser-induced florescence events from the target area and includes additional UV-enhanced fused-silica fiber coupled to optics and a receiving means.

Abstract: Disclosed herein is a method for identifying the compounds contributing to a pungent odor from an air conditioner, a method for artificially reproducing the pungent odor, and preparing a corresponding pungent odor composition. Through the analysis method of the present invention, the compounds contributing to the pungent odor from an air conditioner may be identified and quantified. The pungent odor may be reproduced from a combination of the compounds identified by the analysis method of the present invention. The reproduced pungent odor may provide significant data required for development of an apparatus and a method for removing specific odors.

Abstract: Methods for determining the amount of vitamin D compounds in a sample are provided. The methods can employ LC-MS/MS techniques and optionally the use of deuterated internal standards. Methods for diagnosing vitamin D deficiencies are also provided.

Abstract: An apparatus is provided for sensing an analyte in a fluid.

Abstract: A method that identifies the compounds contributing to a sweet odor from an air conditioner, reproduces the sweet odor, and prepares a corresponding sweet odor composition. Through the analysis method of the present invention, the compounds contributing to the sweet odor from an air conditioner are identified and quantified. The sweet odor is reproduced from a combination of the compounds identified by the analysis method of the present invention. The reproduced sweet odor provides significant data required for development of an apparatus and a method for removing specific odor.

Abstract: A method that identifies the compounds contributing to a fish-like odor from an air conditioner and artificially reproduces the fish-like odor, and prepares a corresponding fish-like odor composition. Through the analysis method of the present invention, the compounds contributing to the fish-like odor from an air conditioner are identified and quantified. The fish-like odor is reproduced from a combination of the compounds identified by the analysis method of the present invention. The reproduced fish-like odor provides significant data required for development of an apparatus and a method for removing specific odor.

Abstract: A method is provided that identifies the compounds contributing to a malodor from an air conditioner, reproduces the malodor, and prepares a corresponding malodor composition. Through the analysis method of the present invention, the compounds contributing to the malodor from an air conditioner are identified and quantified. The malodor is reproduced from a combination of the compounds identified by the analysis method of the present invention. The reproduced malodor provides significant data required for development of an apparatus and a method for removing specific odor.

Abstract: A method of detecting an analyte by: providing a device having a substrate, an alignment layer on the substrate, and a film having 4-pentyl-4?-cyanobiphenyl on the alignment layer; exposing the film to air suspected of containing the analyte; measuring a change in a physical property of the film in response to exposing the film; measuring the kinetics of the change in the physical property; and correlating the kinetics to the concentration of the analyte, identification of the analyte, or both.

Abstract: Disclosed herein is a method for identifying the compounds contributing to urine odor emitting from an air conditioner, a method for artificially reproducing the detected urine odor, and preparing a corresponding urine odor composition. Through the analysis method of the present invention, the compounds contributing to the urine odor emitted from an air conditioner may be identified and quantified. The detected urine odor may be reproduced from a combination of the compounds identified by the analysis method of the present invention. The reproduced urine odor may provide meaningful data required for development of an apparatus and a method for removing specific odor.

Abstract: Disclosed herein is a method for identifying compounds contributing to a sour odor emitting from an air conditioner, a method for artificially reproducing the detected sour odor and preparing a corresponding sour odor composition. Through the analysis method of the present invention, the compounds contributing to the sour odor emitted from an air conditioner may be identified and quantified. The detected sour odor may be reproduced from a combination of the compounds identified by the analysis method of the present invention. The reproduced sour odor may provide meaningful data required for development of an apparatus and a method for removing specific odors.

Abstract: The present invention includes a sensing device and method detecting the presence of a chemical analyte, comprising: a surface; a continuous or discontinuous terbium(III)-triphenylphosphine oxide coordination polymer layer deposited on the surface, wherein the polymer layer is porous; and a luminescence detector, wherein one or more analytes that interact with the polymer layer luminesce at distinct wavelengths unique to each analyte.

Abstract: Provided herein are explosives detection substrates which include an electrospun (electro)sprayed and/or dry spun aromatic polymer, such as polystyrene, and a small molecule fluorophore. Methods for detecting an explosive material using such substrates are also provided.

Abstract: Novel tetracationic cyclophanes incorporating ?-electron poor organic compounds into their ring structures, as well as methods of making the cyclophanes, are provided. The cyclophanes are able to form electron donor-acceptor complexes with a variety of polyaromatic hydrocarbons (PAHs) ranging in size, shape, and electron density. Also provided are methods of using the cyclophanes in the sequestration of PAHs in liquid or gaseous samples, the separation of PAHs from liquid or gaseous samples, the detection of PAHs in liquid samples, and the exfoliation of graphene via pseudopolyrotaxane formation.

Abstract: Porous sol-gel material essentially consisting of units of one or more first polyalkoxysilanes chosen from the following compounds: (chloromethyl)triethoxysilane; 1,3-dimethyltetramethoxydisiloxane; ethyl trimethoxysilane; triethoxy(ethyl)silane; triethoxymethylsilane; triethoxy(vinyl)silane; trimethoxymethylsilane; trimethoxy(vinyl)silane; tetraethoxysilane or tetramethoxysilane (TMOS) and of units of one or more second polyalkoxysilanes chosen from the following compounds: (N-(3-(trimethoxysilyl)propyl)ethylenediamine; 3-aminopropyltriethoxysilane (APTES) and 3-aminopropyltrimethoxysilane, in a first polyalkoxysilane/second polyalkoxysilane molar ratio of 1/0.01 to 1/1, optionally comprising a probe molecule, method of preparation and applications in the trapping of monocyclic aromatic hydrocarbons and other pollutants or in their detection.

Abstract: Processes for simulated moving bed systems for separating a preferentially adsorbed component from a feed stream and processes for determining compositions of one or more streams in the system are provided. The process comprises the steps of rotating a rotary valve to a first valve position to direct the feed stream to a first adsorbent sub-bed. A process stream is irradiated with laser light that is directed from a probe of a Raman system positioned for inline sampling of the stream. Scattered light from the irradiated stream is collected with the probe and analyzed to assess concentrations of one or more components in the stream.

Abstract: Compositions containing polyanthrylene and methods of making these compositions are disclosed herein. The polyanthrylene composition can, for example, be used for detection of iron in a sample.

Abstract: The present invention relates to a compound having a structure analogous to firefly luciferin. In particular, the invention relates to a heterocycle compound which produces a luminescence at a light wavelength different from that of firefly luciferin in nature. The present invention provides a heterocycle compound of following general formula I. In the above general formula, R1, R2 and R3 can be each independently H or C1-4-alkyl. In the above general formula, X and Y can be each independently C, N, S or O. In the above general formula, the olefin chain part expressed as “n” can be changed to desired length.

Abstract: A method of monitoring a reformer unit is disclosed. The method includes analyzing at least one of the feedstock and the product stream. The analyzing includes performing a detailed hydrocarbon analysis of at least one of the feedstock and the product stream. The method further includes obtaining a one-dimensional output from the detailed hydrocarbon analysis and adjusting the one-dimensional output to produce a multi-dimensional equivalent output. Adjusting the one-dimensional output includes applying an appropriate correlation matrix to the one-dimensional output to produce the multi-dimensional equivalent output. The appropriate correlation matrix is selected based upon the characteristics of the feedstock and the particular refinery unit.

Abstract: Methods for determining the amount of vitamin D compounds in a sample are provided. The methods can employ LC-MS/MS techniques and optionally the use of deuterated internal standards. Methods for diagnosing vitamin D deficiencies are also provided.

Abstract: The invention relates to a device (10) for detection of harmful substances with a measurement unit (28) for measuring at least one harmful substance and an evaluation unit (30) for determining the concentration of the at least one harmful substance. The invention also relates to a method for detecting harmful substances in a gas mixture. It is hereby provided that the gas mixture is tested for a gaseous harmful substance or simultaneously for several gaseous harmful substances, wherein the gaseous harmful substance or the gaseous harmful substances is/are measured with different sensor means, and the gaseous harmful substances are optionally chemically modified such that a measurement is performed with the existing sensor means.

Abstract: The invention provides a method and apparatus for trapping, releasing and/or separating sample components in solution passing through a channel with or without packing material present by passing ion current through the channel driven by an electric field. A portion of the ion current comprises cation and/or anion species generated from second solution flows separated from the sample solution flow path by semipermeable membranes. Cation and/or Anion ion species generated in the second solution flow regions are transferred into the sample solution flow path through ion selective semipermeable membranes. Ion current moving along the sample solution flow path is controlled by varying the composition of the second solutions and/or changing the voltage between membrane sections for a given sample solution composition. The sample composition may also be varied separately or in parallel to enhance trapping, release and/or separation efficiency and range.

Abstract: A method and apparatus to trap, release and/or separate sample components in solution passing through a channel with or without packing material present by passing ion current through the channel driven by an electric field. A portion of the ion current includes cation and/or anion species generated from second solution flows separated from the sample solution flow path by semipermeable membranes. Cation and/or anion ion species generated in the second solution flow regions are transferred into the sample solution flow path through ion selective semipermeable membranes. Ion current moving along the sample solution flow path is controlled by varying the composition of the second solutions and/or changing the voltage between membrane sections for a given sample solution composition. The sample composition may also be varied separately or in parallel to enhance trapping, release and/or separation efficiency and range.

Abstract: The invention relates to the quantitative measurement of steroidal compounds by mass spectrometry. In a particular aspect, the invention relates to methods for quantitative measurement of steroidal compounds from multiple samples by mass spectrometry.

Abstract: A chemical sensor using metal nano-particles and a method for manufacturing a chemical sensor using metal nano-particles are provided. The chemical sensor includes: metal nano-particles; single-ligand organic molecules (or a single molecule) that binds to the metal nano-particles by using a metal bonding functional group; a substrate bonding functional group formed at the metal nano-particles and the single-ligand organic molecules as bound to each other; a substrate; electrodes formed on the substrate and having an interdigitate (IDT) structure; and a substrate functional group formed on the substrate and positioned between the electrodes, wherein the substrate bonding functional group and the substrate functional group are covalently bonded.

Abstract: The present application relates to copolymers having at least one optionally substituted fluoranthene as a first monomer unit and at least one optionally substituted pyrrole as a second monomer unit. The copolymer may, for example, emit green light when exposed to a blue or ultraviolet radiation. Methods of making the copolymer are also disclosed, as well as methods and apparatuses for producing light and detecting nitroaromatics using the copolymer.

Abstract: An improved detection reaction for benzene in gas analysis with a gas detector tube formed of a carrier material impregnated with gold(III) oxide in a display layer.

Abstract: Methods for determining the amount of vitamin D compounds in a sample are provided. The methods can employ LC-MS/MS techniques and optionally the use of deuterated internal standards. Methods for diagnosing vitamin D deficiencies are also provided.

Abstract: The present invention relates to a cartridge 1 including a plurality of analyzing tools 3 arranged lined in a plane direction and a case 2 for accommodating the plurality of analyzing tools 3, and being configured to take out the analyzing tool 3 one at a time from the case 2. The plurality of analyzing tools 3 further include engagement means 32, 33 for restricting the analyzing tools 3 adjacent to each other in the plane direction and allowing removable attachment in a thickness direction D1, D2 of the analyzing tool 3. The present invention further relates to an analyzer and an analyzing system for analyzing a sample using the cartridge 1.

Abstract: The present invention provides a device that makes it possible to perform real-time detection and analysis of BTEX components in real samples using an inexpensive and miniaturized hybrid specific binding-separation device. The device may be used in occupational health and safety applications as well as for toxicological population studies to determine the presence of organic volatile components in an air sample.

Abstract: The invention provides a method and apparatus for trapping, releasing and/or separating sample components in solution passing through a channel with or without packing material present by passing ion current through the channel driven by an electric field. A portion of the ion current comprises cation and/or anion species generated from second solution flows separated from the sample solution flow path by semipermeable membranes. Cation and/or Anion ion species generated in the second solution flow regions are transferred into the sample solution flow path through ion selective semipermeable membranes. Ion current moving along the sample solution flow path is controlled by varying the composition of the second solutions and/or changing the voltage between membrane sections for a given sample solution composition. The sample composition may also be varied separately or in parallel to enhance trapping, release and/or separation efficiency and range.