Techniques disclosed herein can be used to perform a rapid, splitless injection of a sample including SVOCs and VOCs. In some embodiments, a system includes two focusing traps combined in series, one inside of a GC oven and one in a separate oven to concentrate the SVOCs inside of the GC oven and concentrate the VOCs outside of the GC oven. Heating the VOC focusing trap and reversing the flow through both focusers allows splitless injection of compounds boiling from as low as −100° C. to as high as 600° C. in a single analysis, with a narrow injection bandwidth to optimize both sensitivity and the resolving power of the analyzer.

The present invention relates to a sample collection device for collecting volatile organic compounds from the air, as well as to a method for characterizing the volatile organic compounds and to the use of this device for characterizing the odorant signature of an individual and allowing a dog to identify an individual from his/her odorant signature.

The present disclosure provides an apparatus and method for producing a policosanol having a specific chromatographic fingerprint. The apparatus of the present disclosure has a feed tank and receiving tanks which are connected to a vacuum system. The method of the present disclosure is carried out by a high vacuum rectification process and includes: firstly, feeding a saponified crude alkanol into a melting tank in which the material is melted and then flows into the feed tank, and then injecting the material into a rectifying still using a delivery pump, followed by first rectification under vacuum condition and sequential collection of fractions at different phases from the tower top and stillage residue from the tower bottom; and after the completion of the rectification of the first batch crude product, carrying out second feeding on the basis of consistent vacuum in the feed tank and the rectifying tower.

Provided is a method for determining whether or not infection with Bursaphelenchus xylophilus exists. The method includes a first sap extraction step of immersing a first fragment sample taken from a first tree in a solvent to extract a first sap contained in the first fragment sample of the first tree, a first concentration analysis step of analyzing a first concentration of an organic compound contained in the first sap, and a first comparison step of comparing the first concentration with a reference concentration of the organic compound contained in the sap of a tree that has not been infected with Bursaphelenchus xylophilus, so as to determine whether or not a coniferous tree is infected with Bursaphelenchus xylophilus.

A composition analysis apparatus for analyzing a composition of a gas includes: a first measurement part measuring concentrations of gases included in a gas to be analyzed; a part calculating converted calorific values, the part including a second measurement part measuring a refractive index of the gas and a speed of a sound propagating through the gas and calculating a converted calorific value of the gas for the refractive index and the sound speed; a part calculating a base miscellaneous gas total error calorific value, the part calculating, based on the converted calorific values, a base error calorific value of an error calorific value attributable to miscellaneous gases included in the gas; and a part calculating a concentration of a first gas not to be measured, the part calculating the concentration of the first gas based on the concentrations of the measured gases and the base error calorific value.

In an LC system using an ODS column (15) and UV detector (17), a cannabis-derived sample is analyzed by gradient elution using a phosphoric acid aqueous solution and phosphoric-acid-containing methanol. A control unit (3) regulates the openings of solenoid valves in a mixer (12) so that the increase rate of the mixture ratio of the phosphoric-acid-containing methanol in a second part of the analysis period is higher than in a first part. By this operation, ten active ingredients (including Total THC, Total CBI) and CEN) contained in cannabis can be satisfactorily separated within an analysis time which is equal to or even shorter than approximately 30 minutes. Each ingredient separated by the column (15) is detected by the UV detector (17). An active ingredient identification processor (22) identifies the ten active ingredients based on the retention times of the peaks on a chromatogram created from the detection signals.

The present disclosure discusses a method of separating a sample (e.g., B vitamins and their vitamers) including coating a flow path of a chromatographic system; injecting the sample into the chromatographic system; flowing the sample through the chromatographic system; separating the sample; and analyzing the separated sample. In some examples, the coating applied to the surfaces defining the flow path is non-binding with respect to the sample—and the separated sample. Consequently, the sample does not bind to the low-binding surface of the coating (e.g., organosilica coating) of the flow path. The applied coating provides an inert barrier that is beneficial for B vitamin analysis, including improved peak shape (less tailing and narrower peak), high sensitivity, and no carry-over.

The invention belongs to the technical field of natural medicinal chemistry and quality control thereof, and relates to a method for determining the weight average molecular weight and the purity of a soluble salt of an acidic saccharide. The method comprises using metal ion content in the soluble salt of an acidic saccharide to correct the weight average molecular weight and the content of the of acid saccharide obtained by the combined use of the molecular sieve chromatography and a multi-angle laser scattering detector SEC-MALS. The method of the present invention can be used to more quickly and accurately determine the weight average molecular weight and content of acidic saccharide soluble salts.

A gas chromatographic (GC) column using a zwitterionic compound and methods of use thereof are disclosed herein. The volatile free acids were observed to strongly retain on these zwitterionic compounds-based columns with excellent peak symmetry. By carefully tuning the structures of these zwitterionic compounds, different selectivity toward volatile free acids was demonstrated. These stationary phases possess a wide working range with thermal stabilities at higher temperatures.

A method and system for injecting a sample into a receiving LC/MS/MS system that is configured to determine a concentration of GenX within the sample, wherein the LC/MS/MS includes ESI. The sample is subjected to one or more of the following ESI conditions: i) a probe gas temperature of approximately 120° C. to approximately 160° C.; ii) a sheath gas heater setting of approximately 150° C. to approximately 275° C.; and iii) a sheath gas flow of approximately 6 L/min to approximately 11 L/min. The concentration of GenX within the sample may have a minimum reporting level of approximately 0.010 μg/L.