Abstract: The invention relates to the detection of vitamin D metabolites. In a particular aspect, the invention relates to methods for detecting derivatized vitamin D metabolites by mass spectrometry.

Abstract: The present disclosure is directed to methods reagents and kits for solid phase extraction, derivatization with crown ether containing derivatizing agents, and mass spectrometry of the derivatized analytes.

Abstract: In order to provide a device for detection of a partial pressure of a measurement gas contained in a surrounding gas, comprising a measurement space with at least one inlet opening to admit surrounding gas into the measurement space and at least one outlet opening to discharge surrounding gas from the measurement space, a quantity that characterizes the partial pressure of the measurement gas in the measurement gas sensor sensitive to the measurement gas to measure a quantity that characterizes the partial pressure of the measurement gas in the measurement space, as well as readout device to read out the measurement gas sensor as well as a method for its operation, which permit metrological detection of the partial pressure of a measurement gas contained in a surrounding gas with improved chronological and spatial resolution, it is proposed that means to determine a response characteristic of device be provided.

Abstract: A reagent composition for releasing vitamin D compounds bound to vitamin D-binding protein, an in vitro method for the detection of a vitamin D compound in which the vitamin D compound is released from vitamin D-binding protein by the use of this reagent composition and the reagent mixture obtained in this manner. The use of the disclosed reagent composition to release vitamin D compounds as well as a kit for detecting a vitamin D compound which contains the reagent composition for releasing vitamin D compounds in addition to common detecting reagents.

Abstract: The invention relates to the detection of vitamin D metabolites. In a particular aspect, the invention relates to methods for detecting derivatized vitamin D metabolites by mass spectrometry.

Abstract: Provided are methods of detecting the presence or amount of a vitamin D metabolite in a sample using mass spectrometry. The methods generally 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 detector receives optical radiation interacted with the measured sheet and is responsive to a predetermined optical absorption band of lignin, a predetermined optical absorption band of dry matter and two or more separate optical bands. The measuring unit measures a lignin dependent value on the basis of attenuation in the absorption band of lignin, and a dry matter dependent value on the basis of attenuation in the absorption band of the dry matter, and determines a general dependence of attenuation with respect to wavelength by measuring attenuations in the separate optical bands. The measuring unit forms a value representing a dry matter content on the basis of the lignin dependent value, the dry matter dependent value and the general dependence of attenuation.

Abstract: Provided are methods of detecting the presence or amount of a dihydroxyvitamin D metabolite in a sample using mass spectrometry. The methods generally comprise associating an amine with a dihydroxyvitamin D metabolite in a sample, ionizing the adduct, and detecting the amount of the ion to determine the presence or amount of the vitamin D metabolite in the sample.

Abstract: Disclosed is a method of determining the presence of an analyte of interest by means of a detection of a reaction product between the analyte of interest and a reactant, the method comprising extracting the analyte of interest from a complex sample matrix; transferring the analyte of interest to an initial reaction mixture; performing a background measurement on the initial reaction mixture comprising at most a negligible concentration of the reaction product, wherein the reaction conditions present in said initial reaction mixture at least reduce the reaction rate of the formation of the reaction product such that the background measurement can be performed without a measurable change in said negligible concentration; altering the reaction conditions in the initial reaction mixture to accelerate said reaction rate; continuing said reaction until the concentration of the reaction product has stabilized; performing a second measurement on the resultant reaction mixture to obtain a signal correlated to said con

Abstract: Disclosed is an apparatus for automatically extracting i2,6-diisopropylphenol (Propofol), from a complex sample matrix comprising cellular material, e.g.

Abstract: An improved analytical method for analysis of dianhydrogalactitol preparations provides a method for determining the purity of dianhydrogalactitol and detecting impurities in preparations of dianhydrogalactitol, as well as identifying any such impurities. The method employs high performance liquid chromatography (HPLC), in particular, HPLC with evaporative light scattering detection (ELSD); the HPLC can be followed by tandem mass spectroscopy. The method can further comprise the step of performing preparative HPLC collection of at least one specific substance peak present in a preparation of dianhydrogalactitol.

Abstract: The present invention is directed to methods for predicting a pregnant woman's risk of carrying a fetus with Down syndrome (Trisomy 21) or Trisomy 18. The methods are based on measuring one or more metabolites obtained from a pregnant woman's bodily fluid, such as blood or urine, and found to be predictive of Trisomy 21 or Trisomy 18.

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 is described for mass spectrometric analysis of a sample comprising phenolic OH, such as a steroid comprising a phenolic OH, using a quaternary amino oxy Cookson (QAOC) reagent. The QAOC reagent can improve ionization and fragmentation properties of phenolic OH samples, which can thereby improve quantitation and identification. The method can include derivatizing the phenolic OH sample with the QAOC reagent to create an adduct and analyzing the adduct using mass spectrometry. Derivatization of the sample can be a one-step reaction where the QAOC reagent comprises an aminooxy MS tag or can be a multi-step reaction, where the adduct is formed by the reaction of carbonyl substituted PTAD based reagent and the sample followed by combination with an aminooxy MS tag. The sample can also be enriched prior to reacting it with the reagent. The method can also allow for multiplexing.

Abstract: A reagent composition for releasing vitamin D compounds bound to vitamin D-binding protein, an in vitro method for the detection of a vitamin D compound in which the vitamin D compound is released from vitamin D-binding protein by the use of this reagent composition and the reagent mixture obtained in this manner. The use of the disclosed reagent composition to release vitamin D compounds as well as a kit for detecting a vitamin D compound which contains the reagent composition for releasing vitamin D compounds in addition to common detecting reagents.

Abstract: Provided are methods of detecting the presence or amount of a vitamin D metabolite in a sample using mass spectrometry. The methods generally comprise 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: An improved analytical method for analysis of dianhydrogalactitol preparations provides a method for determining the purity of dianhydrogalactitol and detecting impurities in preparations of dianhydrogalactitol, as well as identifying any such impurities. The method employs high performance liquid chromatography (HPLC), in particular, HPLC with evaporative light scattering detection (ELSD); the HPLC can be followed by tandem mass spectroscopy. The method can further comprise the step of performing preparative HPLC collection of at least one specific substance peak present in a preparation of dianhydrogalactitol.

Abstract: Provided are methods of detecting the presence or amount of a dihydroxyvitamin D metabolite in a sample using mass spectrometry. The methods generally comprise ionizing a dihydroxyvitamin 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. In certain preferred embodiments the methods include immunopurifying the dihydroxyvitamin D metabolites prior to mass spectrometry. Also provided are methods to detect the presence or amount of two or more dihydroxyvitamin D metabolites in a single assay.

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: The present invention comprises methods for determining the presence, amount, or concentration of analytes of interest including Vitamin D and other secosteroids from biological samples, through derivatization, with improved speed and ease of analysis and improved sensitivity to mass spectrometry. In a preferred embodiment, the present invention comprises methods for determining the presence, amount, or concentration of analytes of interest, including Vitamin D and other secosteroids from whole human blood, through derivatization, and using a plasma collection device to facilitate collection, separation, and preparation of the sample for derivatization and analysis.

Abstract: A reagent composition for releasing vitamin D compounds bound to vitamin D-binding protein and an in vitro method for the detection of a vitamin D compound in which the vitamin D compound is released from vitamin D-binding protein by the use of this reagent composition as well as the reagent mixture obtained in this manner. Also disclosed is the use of the reagent compositions to release vitamin D compounds as well as a kit for detecting a vitamin D compound.

Abstract: The invention herein disclosed provides for compositions, methods for synthesizing said compositions, and methods for using said compositions, wherein the compositions and methods may be used to bind to and/or deactivate a poison oak oil, such as urushiol. The compositions and methods can be used to treat and/or reduce an inflammatory reaction and/or hypersensitivity to natural compounds found in poison oak, poison ivy, poison sumac, mango, lac tree, and cashew nut.

Abstract: Field-effect transistors include at least two thin layers of a semiconductor material and of an electrically conductive gate material that are rolled up together. These two layers are arranged separated from one another by one or multiple barrier layers and this rolled-up multi-layer structure is integratable as field-effect transistors in circuits and/or in microfluid systems as sensors for the detection of fluids.

Abstract: The invention provides a method of assaying for tetrahydrocannabinol in a body fluid. The method includes contacting a sample of body fluid with an imine capable of reacting with tetrahydrocannabinol to yield a quinone imine, and detecting the formation of a quinone imine, where the sample is contacted with the reagent compound at a pH of at least 10.5.

Abstract: Provided are methods of detecting the presence or amount of a vitamin D metabolite in a sample using mass spectrometry. The methods generally comprise 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: The present invention provides methods for detecting urushiol-bearing plants such as poison ivy, poison oak, and poison sumac. Accordingly, one aspect of the invention is a method of detecting a urushiol-bearing plant, the method comprising: dispensing a urushiol marking composition on a surface of the urushiol-bearing plant; then detecting a visual change on the urushiol-bearing plant caused by the reaction of the urushiol marking composition with the urushiol borne by the urushiol-bearing plant.

Abstract: Compounds include carbamate derivatives of vitamin D including vitamin D3 and vitamin D2. The compounds are useful in methods and kits for determining the presence and/or amount of vitamin D including vitamin D analogs and metabolites thereof in a sample suspected of containing the same.

Abstract: Systems, kits, and methods for quantitation of metabolites of vitamin D by liquid chromatography-mass spectrometry (LC-MS). The systems, kits, and methods described herein stabilize and/or promote the formation of the protonated molecular ion ([M+H]+) for the vitamin D metabolites in the ionization source (e.g., electrospray ionization (“ESI”)). Formation of the molecular ion does not involve loss of a water molecule from the parent molecule. Subsequent fragmentation of the [M+H]+ ion yields product ions that are specific to each molecular ion. The systems, kits, and methods described herein provide for no compromise in specificity and provide for a significant increase in sensitivity relative to previously described methods.

Abstract: A gas sensor cell using a liquid crystal composite material is provided. The gas sensor cell has recovery capability and can be reused. Upon gas adsorption, the liquid crystal composite material has visually detectable color changes and changes in electrical properties to facilitate the measurement of gas concentration from low to high.

Abstract: Quantification of vitamin D2, vitamin D3, and the monohydroxy and diihydroxy metabolites of vitamin D2 and vitamin D3, can comprise labeling analytes with mass spectrometry (MS) tagging reagents and performing LC-MSMS analysis of the labeled analytes. The labeled analytes can include a labeled standard and can have distinct retention times on a reversed phase column, as well as distinct masses. Under high energy collisions, reporter groups can be generated. The intensity or the peak area detected for each reporter group can be used for quantitation. In some embodiments, a one-step tagging reagent is used that is a dienophile-containing, labeled m Diels Alder reagent.

Abstract: The present invention relates to a method for diagnosing, and treating renal disease in a patient by having a test performed for detecting or quantifying one or more renal disease markers present in a test blood sample from the patient; and administering treatment to improve renal function. In particular embodiments, the test performed quantifies cis-aconitate, and the patient is identified as having the renal disease when a concentration of cis-aconitate present in the patient's test blood sample is higher than that of a control. Methods of the present invention can allow diagnosis and treatment of patients with early stage renal disease, such as early stage renal failure. Another aspect of the present invention relates to methods for screening for a prophylactic/therapeutic agent for treating renal disease using one or more renal disease markers.

Abstract: Described herein are methods for determining an amount of an analyte in a test sample. The methods involve preparing a calibration curve using standard samples containing an isotopically-labeled standard in a biological matrix.

Abstract: There is provided a method of diagnosing a disease state in a subject. The disease state is caused or effected by pneumococcal infection. The method includes obtaining a biological test sample from the subject. The biological sample includes at least one metabolite selected from the group consisting of citrate, trigonelline, acetylcarnitine, acetone, myo-inositol, 3-hydroxybutyrate, glucose and carnitine. A respective concentration of each one of the at least one metabolite is compared with a predetermined concentration value associated with a corresponding one of the at least one metabolite. The predetermined concentration value is indicative of the disease state. For example, the biological sample includes any one of citrate, trigonelline, acetylcamitine, acetone, myoinositol, 3-hydroxybutyrate, glucose and carnitine. As a further example, the biological samples include any combination of citrate, trigonelline, acetylcamitine, acetone, myo-inositol, 3-hydroxybutyrate, glucose and carnitine.

Abstract: A method for measuring the concentration of advanced-oxidation active species includes a step of measuring the absorption characteristics of a wavelength region including the wavelength of 195 to 205 nm of a sample and a step of determining the concentration of the advanced-oxidation active species from the aforementioned measured absorption characteristics on the basis of the absorption coefficient of the advanced-oxidation active species in the wavelength region including the wavelength of 195 to 205 nm. The method and the apparatus can measure the concentration of the advanced-oxidation active species directly in line without the need for adding an additive.

Abstract: The invention relates to the detection of vitamin D metabolites. In a particular aspect, the invention relates to methods for detecting derivatized vitamin D metabolites by mass spectrometry.

Abstract: System for measuring the hydro carbonate content in minerals, particularly pyrobituminous shale minerals, while they pass through the transport or production system, in such a way as to permit the prior adjustment of the processing conditions of said minerals. The system consists of a set of equipment for the measurement of water content, material density and hydrogen content in the mineral, said equipment being combined in such a way as to create a specific time delay between the measurements, in order for the collected data to be micro processed and the processing conditions to be adjusted in real time, based on the calculated hydro carbonate content.

Abstract: The invention relates to a chemical breath testing device including a transparent testing tube which cooperates with an outlet piece incorporating a valve and fitted to an inflatable bag. The testing tube is provided with a member for pushing the valve which is formed by the bottom of a cap. The outer sidewall of the cap is resiliently deformable and serves to form an interlocking connection between the testing tube and the outlet piece. The cap is mounted in a mobile manner at the end of the testing tube and carries a cutting blade for cutting a seal closing off the outlet of the testing tube, of which the rim forms a counter-blade.

Abstract: An improved analytical method for analysis of dianhydrogalactitol preparations provides a method for determining the purity of dianhydrogalactitol and detecting impurities in preparations of dianhydrogalactitol, as well as identifying any such impurities. The method employs high performance liquid chromatography (HPLC), in particular, HPLC with evaporative light scattering detection (ELSD); the HPLC can be followed by tandem mass spectroscopy. The method can further comprise the step of performing preparative HPLC collection of at least one specific substance peak present in a preparation of dianhydrogalactitol.

Abstract: Provided is a method for quantitative analysis of carotenoids such as ?-cryptoxanthin contained in a sample such as citrus fruit or the like which enables simple and accurate quantitative analysis. An internal standard such as lycopene or retinal is used, whereby work is facilitated and an error of a measured value is reduced. Further, a dehydrating agent is added during saponification reaction in the preparation of a sample for analysis, whereby a deviation of a measured value can be reduced.

Abstract: The present invention generally relates to a low temperature plasma probe for desorbing and ionizing at least one analyte in a sample material and methods of use thereof. In one embodiment, the invention generally relates to a low temperature plasma probe including: a housing having a discharge gas inlet port, a probe tip, two electrodes, and a dielectric barrier, in which the two electrodes are separated by the dielectric barrier, in which application of voltage from a power supply generates a low temperature plasma, and in which the low temperature plasma is propelled out of the discharge region by the electric field and/or the discharge gas flow.

Abstract: Quantification of vitamin D2, vitamin D3, and the monohydroxy and diihydroxy metabolites of vitamin D2 and vitamin D3, can comprise labeling analytes with mass spectrometry (MS) tagging reagents and performing LC-MSMS analysis of the labeled analytes. The labeled analytes can include a labeled standard and can have distinct retention times on a reversed phase column, as well as distinct masses. Under high energy collisions, reporter groups can be generated. The intensity or the peak area detected for each reporter group can be used for quantitation. In some embodiments, a one-step tagging reagent is used that is a dienophile-containing, labeled Diels Alder reagent.

Abstract: Disclosed is an apparatus for automatically extracting i2,6-diisopropylphenol (Propofol), from a complex sample matrix comprising cellular material, e.g.

Abstract: Disclosed is a method of determining the presence of an analyte of interest by means of a detection of a reaction product between the analyte of interest and a reactant, the method comprising extracting the analyte of interest from a complex sample matrix; transferring the analyte of interest to an initial reaction mixture; performing a background measurement on the initial reaction mixture comprising at most a negligible concentration of the reaction product, wherein the reaction conditions present in said initial reaction mixture at least reduce the reaction rate of the formation of the reaction product such that the background measurement can be performed without a measurable change in said negligible concentration; altering the reaction conditions in the initial reaction mixture to accelerate said reaction rate; continuing said reaction until the concentration of the reaction product has stabilized; performing a second measurement on the resultant reaction mixture to obtain a signal correlated to said con

Abstract: A method of predicting a SGA infant in a patient at a pre-symptomatic gestational stage is described. The method comprises a step of assaying a biological sample from the patient for an abundance of a plurality of metabolite biomarkers selected from the 19 metabolite biomarkers of Table IV, correlating the abundance of the plurality of metabolite biomarkers with a metabolite fingerprint of SGA shown in Table IV, and predicting SGA based on the level of correlation between the abundance of the plurality of metabolite biomarkers and the metabolite fingerprint of Table IV.

Abstract: Desmosterol alone, the combination of desmosterol and amyloid beta, the combination of desmosterol and gelsolin and the combination of desmosterol, amyloid beta and gelsolin can be used as in-blood biomarkers for Alzheimer's disease or mild cognitive impairment. A method for evaluating the effect of a candidate for a therapeutic agent to treat Alzheimer's disease or mild cognitive impairment, a method for aiding the diagnosis of Alzheimer's disease or mild cognitive impairment, and a method for diagnosing Alzheimer's disease or mild cognitive impairment are provided in which the biomarkers are used.

Abstract: The invention describes a method of determining the amount of an analyte in a sample wherein the analyte comprises one or more vitamin D metabolites; comprising the steps of; contacting the analyte with an alkylamine to form an alkylamine adduct; subjecting the adduct to a MS technique to determine the amount of the adduct; and calculating the amount of the analyte equivalent to the amount of the adduct.

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: Described herein are methods for determining an amount of an analyte in a test sample. The methods involve preparing a calibration curve using standard samples containing an isotopically-labeled standard in a biological matrix.

Abstract: Provided are methods of detecting the presence or amount of a vitamin D metabolite in a sample using mass spectrometry. The methods generally comprise 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.