A method of quantifying a target compound includes applying an oxidation/reduction potential to an electrochemical cell (14); measuring an electrochemical current during the application of the oxidation/reduction potential; and ionizing and directing the target compound before and after the application of the oxidation/reduction potential to a mass spectrometer (16) that measures a target compound ion intensity. The method further includes determining a target compound ion intensity change due to the application of the oxidation/reduction potential and determining a total amount of the target compound in the sample using the measured electrochemical current and the target compound ion intensity change. Determining the target compound ion intensity change may comprise either comparing the target compound ion intensity before and after the electrolysis relative to a reference peak or comparing the integrated peak area of a target compound ion in an extracted ion chromatogram before and after the electrolysis.

A sensitive method for quantitating curcuminoids in biological and other samples is described wherein curcuminoids in the sample are derivatized to boron difluoride curcuminoid complexes then analyzed by liquid chromatography-mass spectroscopy.

The present disclosure relates to a marker for identifying Korean ginseng cultivars and a method of identifying Korean ginseng cultivars using the same. Specifically, the present disclosure provides a marker for identification of Korean ginseng cultivars, which is obtained by identifying and separating an active ingredient, which is contained only in Korean ginseng cultivars, among non-saponin components. In addition, the present disclosure makes it possible to determine whether a product sold as Korean ginseng is Korean ginseng by separating and purifying the active ingredient without using a conventional molecular biological method.

A sample measurement device (100) includes a measurement unit (10) configured to measure a sample containing a plurality of components according to a measurement condition (30) including a plurality of parameters (31), and a data processing unit (20) configured to acquire measurement data, and the data processing unit is configured to acquire a distribution (43) of a measurement quality indicator (42) according to the measurement condition based on the measurement data (40), and identify a peak (41) of each of the components in the measurement data based on the distribution of the measurement quality indicator and the parameters used when the sample is measured.

There is provided a content determination assistance system capable of efficiently assisting in identifying a mixture that is highly likely to be contained in a sample. The content determination assistance system records characteristic mass spectrum data for each of known compounds. The content determination assistance system extracts the corresponding current-sample mass spectrum from the current-sample mass spectrum data, and detects a high intensity mass spectra from the corresponding current-sample mass spectrum. The content determination assistance system outputs a degree of concordance in the mass spectrum between a known compound subject to determination and a current sample using the characteristic mass spectrum and the high intensity mass spectrum.

A method for analyzing aromatic compounds, and a reagent kit for LC-MS analysis of aromatic compounds. The method includes preparing a diazonium reagent, contacting aromatic compounds in a sample with the diazonium reagent to form an analyte; and measuring an amount or ratio of the analyte. The reagent kit includes a diazonium reagent, wherein the diazonium reagent includes (i) a diazonium salt that contains a diazonium ion; (ii) an amine and nitrous acid; and/or (iii) a nitrite and an acid.

From a chromatogram obtained by subjecting a blood sample to liquid chromatography, the ratio of a peak value of an HbF peak to a peak value of the entire hemoglobin peak is calculated, and the ratio is multiplied by a predetermined factor, to calculate a corrected value of the HbF peak with respect to the entire hemoglobin peak.

A method for identifying converters from tobacco seedling population. The method includes: 1) sowing and cultivating tobacco seeds to be identified for 45-55 days; sampling a plurality of leaf disks from each of 45-55 days old seedlings; 2) incubating the plurality of leaf disks of each seedling in a sealed container at 37° C. for 10-12 hours, thereby obtaining a plurality of incubated tobacco leaves of each seedling; 3) immersing the plurality of incubated tobacco leaves of each seedling in an extractant, extracting alkaloids and obtaining an extract of each seedling; 4) analyzing the amounts of nicotine and nornicotine in the alkaloids extract of each seedling; and 5) automatically recognizing peaks of the alkaloids extract of each seedling, and calculating the percent nicotine conversion (PNC) and the pseudo percent nicotine conversion (PPNC).

Provided is a method for measuring the concentration of aliphatic hydroxy oxime and neodecanoic acid using gas chromatography. The method includes the steps of: (a) removing, from a reference material containing an extractant and a diluent, the diluent using a silica column; (b) generating a calibration curve by calculating each peak area of aliphatic hydroxy oxime and neodecanoic acid, which are extractants, by peak integration of gas chromatograms; and (c) calculating the peak area of the organic solvent used in DSX process through the steps (a) and (b) and comparing the peak area with the calibration curve of the step (b) to measure the concentration of aliphatic hydroxy oxime and neodecanoic acid.

Provided is a method for inhibiting extractant degradation by a diluent and an extractant input manner, the method including steps of: (a) determining and analyzing the total volume of the DSX solvent when the diluent and the extractant, which are the DSX solvents, are added in the DSX process and identifying the concentration of the extractant; (b) calculating an extractant concentration according to an amount of the diluent to be added based on the analysis value of step (a), and then adding the extractant; (c) determining the ratio between the extractants through analysis after adding the extractants; (d) adding the extractant to be needed when the ratio between extractants is out of the range; and (e) adding the diluent and analyzing the ratio between the extractants.