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:
Certain embodiments described herein are directed to systems including a cell downstream of a mass analyzer. In some instances, the cell is configured as a reaction cell, a collision cell or a reaction/collision cell. The system can be used to suppress unwanted ions and/or remove interfering ions from a stream comprising a plurality of ions.
Abstract:
By utilizing the combination of a unique electronic ion injection control circuit in conjunction with a particularly designed drift cell construction, the instantly disclosed ion mobility spectrometer achieves increased levels of sensitivity, while achieving significant reductions in size and weight. The instant IMS is of a much simpler and easy to manufacture design, rugged and hermetically sealed, capable of operation at high temperatures to at least 250° C., and is uniquely sensitive, particularly to explosive chemicals.
Abstract:
Provided is a mass spectrometer capable of easy exchange of a measurement sample and suppressing a carryover. The mass spectrometer includes a mass spectrometry section, an ion source the internal pressure of which is reduced by a differential pumping from the mass spectrometry section and the ion source ionizes the sample gas, a sample container in which the sample gas is generated by vaporizing the measurement sample, a thin pipe that introduces the sample gas generated in the sample container into the ion source, an elastic tube of openable and closable that connects the sample container and the thin pipe, a pair of weirs that closes or opens the elastic tube so as to sandwich the elastic tube, and a cartridge that integrates the sample container, the thin pipe, and the elastic tube, and is detachable in a lump from a main body of the mass spectrometer.
Abstract:
Certain embodiments described herein are directed to systems including a cell downstream of a mass analyzer. In some instances, the cell is configured as a reaction cell, a collision cell or a reaction/collision cell. The system can be used to suppress unwanted ions and/or remove interfering ions from a stream comprising a plurality of ions.
Abstract:
By utilizing the combination of a unique electronic ion injection control circuit in conjunction with a particularly designed drift cell construction, the instantly disclosed ion mobility spectrometer achieves increased levels of sensitivity, while achieving significant reductions in size and weight. The instant IMS is of a much simpler and easy to manufacture design, rugged and hermetically sealed, capable of operation at high temperatures to at least 250° C., and is uniquely sensitive, particularly to explosive chemicals.
Abstract:
A business method for use in classifying patient samples. The method includes steps of collecting case samples representing a clinical phenotypic state and control samples representing patients without said clinical phenotypic state. Preferably the system uses a mass spectrometry platform system to identify patterns of polypeptides in said case samples and in the control samples without regard to the specific identity of at least some of said polypeptides. Based on identified representative patterns of the state, the business method provides for the marketing of diagnostic products using representative patterns. The present invention relates to systems and methods for identifying new markers, diagnosing patients with a biological state of interest, and marketing/commercializing such diagnostics. The present invention relates to systems and methods of greater sensitivity, specificity, and/or cost effectiveness.
Abstract:
Provided are methods for determining the amount of reverse T3 in a sample using mass spectrometry. The methods generally involve ionizing reverse T3 in a sample and detecting and quantifying the amount of the ion to determine the amount of reverse T3 in the sample.
Abstract:
Provided are methods for determining the amount of reverse T3 in a sample using mass spectrometry. The methods generally involve ionizing reverse T3 in a sample and detecting and quantifying the amount of the ion to determine the amount of reverse T3 in the sample.
Abstract:
In order to provide an analysis method that is capable of determining a glycan structure with high detection sensitivity, a method of the present invention includes the steps of: carrying out triple quadrupole mass spectrometry at various values of CID energy; creating an energy-resolved profile including yield curves representing relationships between (i) a value of the CID energy and (ii) measured amounts of specific types of product ions; preparing a reference profile, and identifying a glycan structure of a test material by comparing the energy-resolved profile with the reference profile.