A pre-analysis treatment device usable for an amino acid, organic acid, and glucide includes an ion-exchange unit configured to load a test sample on a solid-phase cartridge S having a strong ion-exchange resin phase, to allow the strong ion-exchange resin phase to adsorb a predetermined organic compound, then supply a dehydration solvent to dehydrate the strong ion-exchange resin phase, and a derivatization unit configured to feed a predetermined amount of the derivatization reagent to the dehydrated strong ion-exchange resin phase to allow the derivatization reagent to retain for a predetermined time period, thereby trimethylsilylating the organic compound adsorbed on the strong ion-exchange resin phase, and simultaneously desorbing the trimethylsilylated organic compound from the strong ion-exchange resin phase, and then supply a push-out solvent to push the trimethylsilylated organic compound desorbed, out of the solid-phase cartridge S. The device enables at least one organic compound selected from amino acids, organic acids and glucides contained in a test sample to be derivatized and collected easily in a short period of time, and automation of the pre-analysis treatment.

The gas chromatograph system 10 has the gas chromatograph 1, and a detector 2. The detector 2 has the redox unit 14. The redox unit 14 has the reaction tube 142, the oxidation zone 146 and the reduction zone 147. The reduction zone 147 is disposed on the downstream side of the oxidation zone 146. The reduction zone 147 is disposed out of a position perpendicular direction above the oxidation zone 146. Hence, even if the air heated around the oxidation zone 146 moved upward by convection, the reduction zone 147 is prevented from being exposed to such hot air.

The present disclosure relates to a computer-implemented method for analyzing a product stream of a chemical reaction. The method includes withdrawing a portion of the product stream of the chemical reaction from a reactor, the portion of the product stream having a volume of less than about 200 μL. The method further includes mixing the portion of the product stream with a diluent to produce a sample and then transferring the sample to a liquid chromatography device. A measured chemical profile is then developed, via the liquid chromatography device, which can be used for process monitoring or real time decision making. In some embodiments, the method can include adjusting a reaction condition in the reactor based on differences between the measured chemical profile and a desired chemical profile.

Systems and methods that facilitate the automatic (or substantially automatic) preparation of a sample of a product containing molecules for analysis and automatic (or substantially automatic) performance of an assay of that sample. Thus, the preparation and analysis can be performed substantially in-real time, or, in other words, much more quickly than presently allowed by conventional systems and methods.

A system for determining isotopic composition of a gaseous sample. The system includes at least one gas chromatograph for separating the gaseous sample into gaseous components. Furthermore, the system includes a combustion furnace operatively coupled with the at least one gas chromatograph for oxidizing the gaseous components. Moreover, the system includes a water separator operatively coupled with the combustion furnace. Furthermore, the system includes an isotope-ratio mass spectrometer operatively coupled with the water separator. Moreover, the isotope-ratio mass spectrometer comprises an ion source for generating ion beams associated with each of the oxidized gaseous components and a mass analyser for receiving the generated ion beams from the ion source, wherein the mass analyser is operable to determine isotopic concentrations associated with each of the ion beams. Furthermore, the isotope-ratio mass spectrometer is operable to use the determined isotopic concentrations to determine the isotopic composition of the gaseous sample.

A system for determining isotopic composition of a gaseous sample. The system includes at least one gas chromatograph for separating the gaseous sample into gaseous components. Furthermore, the system includes a combustion furnace operatively coupled with the at least one gas chromatograph for oxidizing the gaseous components. Moreover, the system includes a water separator operatively coupled with the combustion furnace. Furthermore, the system includes an isotope-ratio mass spectrometer operatively coupled with the water separator. Moreover, the isotope-ratio mass spectrometer comprises an ion source for generating ion beams associated with each of the oxidized gaseous components and a mass analyser for receiving the generated ion beams from the ion source, wherein the mass analyser is operable to determine isotopic concentrations associated with each of the ion beams. Furthermore, the isotope-ratio mass spectrometer is operable to use the determined isotopic concentrations to determine the isotopic composition of the gaseous sample.

Provided is a system comprising a conduit from a gas chromatograph column to a single reactor comprising a Fe, Co, Pt, Ni, Rh, Pd and/or Ru catalyst(s), with hydrogen and oxygen feed conduits for providing hydrogen and oxygen to the reactor, and a conduit from the reactor to an FID detector. This allows one to practice a method for the detection and quantification of organic molecules from a gas chromatograph which comprises passing the effluent from a gas chromatograph column to a reactor comprising a Fe, Co, Pt, Ni, Rh, Pd and/or Ru catalyst; adding hydrogen and air/oxygen to the reactor; reacting the effluent from the gas chromatograph column in the reactor to sequentially oxidize then reduce all organic containing molecules to CH.sub.4 by heating to an elevated temperature, and passing the reactor effluent to an FID.

The present disclosure relates to an oxidizer, and related methods, for oxidizing polar modifiers in chromatographic mobile phases. The oxidizer enables the use of flame-based detection in chromatographic separations, such as carbon dioxide based chromatography, which employ polar modifiers, such as methanol. Upon exiting a chromatographic column, the mobile phase containing the polar modifier is flowed through an oxidizer that contains a catalyst to oxidize at least a portion of the polar modifier to a species that does not interfere with the function of the flame-based detector. The oxidizer allows for flame-based detection, such as flame ionization detection, in applications in which a polar modifier with a reduced form of carbon is used.

A reaction device is provided with a reaction tube and an inert gas supply passage. The reaction tube may be composed of an alumina sintered body and configured to oxidize and reduce a sample gas therein. An inert gas is supplied into the reaction tube through the inert gas supply passage. With this, since it is possible to reduce the contamination that interferes with activation of the alumina sintered body, aging time can be shortened.

The gas chromatograph system 10 has the gas chromatograph 1, and a detector 2. The detector 2 has the redox unit 14. The redox unit 14 has the reaction tube 142, the oxidation zone 146 and the reduction zone 147. The reduction zone 147 is disposed on the downstream side of the oxidation zone 146. The reduction zone 147 is disposed out of a position perpendicular direction above the oxidation zone 146. Hence, even if the air heated around the oxidation zone 146 moved upward by convection, the reduction zone 147 is prevented from being exposed to such hot air.