58 results about "Mass chromatography" patented technology

The invention discloses an analysis method for detecting short-chain fatty acid in table salt by headspace arrow-shaped solid phase microextraction-gas chromatography mass spectrometry, and belongs to the field of analysis and detection. According to the method, firstly, based on a headspace arrow-shaped solid-phase microextraction technology, polar short-chain fatty acids are extracted and enriched by using an extraction head of 100 [mu] m Polyacrylate, and then gas chromatography-mass spectrometry is used for detection, so that qualitative and quantitative detection of nine short-chain fatty acids such as acetic acid, propionic acid, isobutyric acid, butyric acid, 2-methylbutyric acid, valeric acid, 2-methylvaleric acid, 4-methylvaleric acid and hexanoic acid in the table salt can be realized. According to the method, the headspace arrow-shaped solid-phase microextraction technology is used for extracting the short-chain fatty acid in the table salt for the first time, the effects of interference removal, concentration and enrichment are achieved, and the detection limit of the method is reduced by about 2 orders of magnitude compared with that of a headspace-gas chromatography-mass spectrometry method. The method is simple in sample preparation, high in sensitivity, good in recovery rate and stability and suitable for accurate detection of the short-chain fatty acid in the table salt.

The invention discloses a screening method of metabolic markers for distinguishing non-colorectal cancer diseases and colorectal cancer and application of the screening method. After a urine sample is treated, high-flux gas chromatography-mass spectrometry (GC-MS) derivatization polar metabolite analysis and liquid chromatography-mass spectrometry (LC-MS) polar metabolite detection are respectively carried out. The method comprises the following steps: sequentially carrying out homogenization treatment on obtained metabonomics data, screening 14 metabolic markers from the metabonomics data by adopting a univariate and multivariate statistical analysis method, and selecting 10, 8 and 4 metabolic markers from the 14 metabolic markers, so that the method also has a relatively good distinguishing effect on non-colorectal cancer diseases and colorectal cancer diseases. The invention discloses a non-invasive, high-accuracy and non-invasive urine metabolite marker combination, which improves the diagnosis and evaluation capability of early patients with colorectal cancer so as to realize early discovery, early diagnosis and early intervention clinically, thereby reducing the morbidity and mortality of the patients with colorectal cancer.

The utility model discloses an energy-saving device for treating low-concentration foul waste gas, which belongs to the technical field of waste gas treatment and comprises a control system and a waste gas inlet, a gas chromatography-mass spectrometry instrument is arranged at the waste gas inlet, and a pipeline diverter valve is arranged behind the gas chromatography-mass spectrometry instrument. The pipeline diverter valve is connected with a first pipeline and a second pipeline, the first pipeline is connected with a biological filter tank, the second pipeline is connected with an activated carbon adsorption tank, a connecting pipeline is arranged between the biological filter tank and the activated carbon adsorption tank, and a switch valve is arranged on the connecting pipeline. A photocatalytic oxidation pond is connected behind the activated carbon adsorption pond and is connected with a discharge outlet. Through the arrangement of the gas chromatography-mass spectrometry instrument and the pipeline diverter valve, accurate analysis and directional treatment of waste gas components are realized, and the waste gas components monitored in real time can be diverted to the most suitable treatment unit, so that the treatment efficiency and the energy-saving effect are improved to the maximum extent.

The invention discloses a method for detecting zinc stearate in a stabilizer, and belongs to the technical field of heat stabilizer component detection. The detection method comprises the following steps: carrying out ethanol Soxhlet extraction on a part of a stabilizer to be detected to obtain an extracting solution; freezing the extracting solution, and if a precipitate is obtained, carrying out qualitative test on the precipitate by adopting FTIR (Fourier transform infrared spectroscopy) and / or GCMS (gas chromatography mass spectrometry) to determine whether the stabilizer to be tested contains zinc stearate or not; and when FTIR and / or GCMS test results prove that the stabilizer to be tested contains zinc stearate, carrying out zinc quantitative test on the stabilizer to be tested by adopting a titration method or an ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer) method. According to the method, rapid screening, selective separation and high-precision quantification of zinc stearate in the stabilizer can be realized, and a reliable analysis means is provided for quality control of the PVC heat stabilizer.

The invention provides a method for detecting 1-amino-4-cyclopentyl piperazine in rifapentine, which comprises the following steps of: adding 1-amino-4-cyclopentyl piperazine into rifapentine; according to the method, a liquid chromatography-mass spectrometry method is adopted, a Waters XBridge C18 chromatographic column is selected, and a mixed solution of a trifluoroacetic acid solution and methanol or methanol acetonitrile is adopted as a mobile phase. The method disclosed by the invention is simple, has good specificity, sensitivity and accuracy, and is suitable for determining the 1-amino-4-cyclopentyl piperazine in the rifapentine.

A method of analyzing isopropylphenyl phosphate according to an embodiment includes desorbing a sample by hot extraction, analyzing the desorbed sample to obtain a mass chromatogram of one or more compounds in the sample by gas chromatography mass spectrometry and determining whether the mass chromatogram includes one or more peaks of one or more product ions and / or one or more molecular ions each having a predetermined mass-to-charge ratio (m / z).

It is provided that a layered body having excellent absorption speeds of fuel and the like to the filter media. A layered body comprising a first base material and a second base material, wherein the first base material and the second base material are adhered to each other via an adhesive, the first and second base materials each contain a phenol-based resin and an aliphatic hydrocarbon detected during a retention time of 12.0 to 30.0 minutes under pyrolysis-gas chromatography mass spectrometry (PY-GC / MS), and the adhesive contains 65 mol % or more of a butylene terephthalate unit and 5 mol % or more of a butylene isophthalate unit, and has an acid value of not larger than 100 eq / ton, a glass transition temperature of −10 to 60° C., and a specific gravity of not less than 1.20.

The present invention provides a method and application for calibrating hydrogen isotope gas sensitivity. The provided method comprises: (1) detecting a gas to be tested based on mass spectrometry-chromatography to determine the sample components and content contained in the gas to be tested, which is counted as a first detection result; (2) using the hydrogen isotope gas percentage in the gas to be tested obtained from the first detection result to determine the positive calibration sensitivity; (3) based on the positive calibration sensitivity, using a high-resolution mass spectrometer to measure the sample components and content contained in the gas to be tested, which is counted as a second detection result; (4) using the hydrogen isotope gas percentage in the gas to be tested obtained from the second detection result to determine the recalibration sensitivity. The provided method can calibrate hydrogen isotope sensitivity without using national standard substances, thereby ensuring the accuracy of hydrogen isotope abundance determination.

The present invention belongs to the field of analytical chemistry, and specifically relates to a method for rapidly detecting indoleacetic acid in livestock meat by gas chromatography-mass spectrometry and its application. The method comprises the following steps: (1) sample preparation and extraction; (2) purification and concentration by using a SinChERS purification column; (3) rapid derivatization and extraction of derivatization products; (4) gas chromatography-mass spectrometry analysis; (5) formulation of a standard working curve and quantitative analysis. The present invention is simple, rapid and accurate, greatly shortens the sample purification and derivatization time, reduces the experimental cost, improves the sample pretreatment efficiency and can achieve accurate detection, and plays an important role in the detection of indoleacetic acid content in livestock meat.

This polyamic acid composition contains a polyamic acid, an organic solvent, aminophenol, and methyl aminobenzoate. The polyamic acid has a 4-aminophenyl-4-aminobenzoate residue as a diamine residue. The content of the 4-aminophenyl-4-aminobenzoate residue is 70% by mol or more with respect to the total mass of all diamine residues constituting the polyamic acid. When the content of the aminophenol is determined by gas chromatography mass spectrometry using a sample obtained by dilution the polyamic acid composition to a polyamic acid concentration of 1% by mass, the content of the aminophenol is 1 ppm by mass to 30 ppm by mass inclusive with respect to the whole mass of the sample. When the content of the methyl aminobenzoate is determined by gas chromatography mass spectrometry using a sample obtained by dilution the polyamic acid composition to a polyamic acid concentration of 1% by mass, the content of the methyl aminobenzoate is 0.01 ppm by mass to 0.10 ppm by mass inclusive with respect to the whole mass of the sample.

A method of determining an API gravity of a crude oil includes obtaining a reservoir sample containing the crude oil, separating an aromatic fraction from the reservoir sample, analyzing the aromatic fraction using a gas chromatography mass spectrometry (GC-MS) instrument, determining peak areas and a ratio of 4-methyldibenzothiophene and 1-methyldibenzothiophene, and determining the API gravity of the crude oil in the reservoir sample using an empirical correlation between API gravity and the ratio of 4-methyldibenzothiophene to 1-methyldibenzothiophene. A method of determining productivity of a region of a reservoir includes determining an API gravity of a crude oil in the sample from the region of the reservoir using an empirical correlation between API gravity and the ratio of 4-methyldibenzothiophene to 1-methyldibenzothiophene, and based on the API gravity of the sample, determining the productivity of the region of the reservoir.

The invention discloses an FM550 in-vivo enrichment detection method and a risk monitoring method for tilapia, and relates to the technical field of ecological monitoring. The method not only can reflect the actual risk of a flame retardant in the environment, but also can be conveniently applied to aquaculture and ecological risk assessment. The detection method comprises the following steps: obtaining a liver sample and a muscle sample of a target tilapia mossambica, freeze-drying the liver sample and the muscle sample for 72 hours, and crushing and homogenizing 1 g of the liver sample and the muscle sample for later use; the target tilapia mossambica refers to tilapia mossambica which is exposed in an FM550 environment within 56 days; and carrying out solvent extraction, QuEChERS purification treatment and solvent conversion treatment on the crushed and homogenized sample, and then carrying out gas chromatography-mass spectrometry detection to obtain a detection result of FM550 in-vivo enrichment.

The invention discloses a method for rapidly detecting butyric acid and isomeride thereof in baijiu, which comprises the following steps of: directly adding 0.5-3ml of baijiu sample into a sampling bottle of a rapid gas chromatography-PTR photochemical ionization source-time-of-flight mass spectrometer without any pretreatment process and a large amount of organic solvent; appropriate rapid gas chromatography-mass spectrometry conditions are selected, and rapid gas chromatography-PTR photochemical ionization source-time-of-flight mass spectrometry is utilized to rapidly complete detection of butyric acid and isomeride thereof in Baijiu. According to the method established by the invention, the sample does not need any pretreatment process or a large amount of organic solvents, the butyric acid and the isomeride thereof in the Baijiu can be rapidly detected within five minutes, and a powerful means is provided for adjusting the acidity and taste of the Baijiu.

Provided is a masterbatch composition comprising 30 to 98% by weight of an aromatic vinyl polymer containing at least one aromatic vinyl polymer block, and 2 to 70% by weight of a hydrocarbon compound group containing a plurality of hydrocarbon compounds having different numbers of carbon atoms in the range of 12 or more and 60 or less carbon atoms, wherein when the hydrocarbon compound group is measured by gas chromatography mass spectrometry (GC-MS) to determine ratios of detected areas of the hydrocarbon compound components having different numbers of carbon atoms to the total peak area of the components having carbon atoms in the range of 12 or more and 60 or less carbon atoms where the total peak area of components having 12 or more and 60 or less carbon atoms is regarded as 100%, the total peak area of components having 24 or more and 27 or less carbon atoms is 5% or more, the total peak area of components having 27 or more and 30 or less carbon atoms is 5% or more, the total peak area of components having 30 or more and 33 or less carbon atoms is 5% or more, the total peak area of components having 33 or more and 36 or less carbon atoms is 5% or more, and the total peak area of components having 27 or less carbon atoms is 45% or less.

The present application belongs to the technical field of organic matter detection, and particularly relates to a method for extracting polycyclic aromatic hydrocarbons and halogenated polycyclic aromatic hydrocarbons by using an adsorption pen, removing water by using a pre-column, and performing gas chromatography mass spectrometry analysis, which comprises the following steps: (1) collecting a sample, placing a water sample in a headspace bottle, and inserting an adsorption pen into the headspace bottle; (2) vacuumizing the adsorption pen; (3) removing the vacuum source, and placing the sample in a shaker for oscillation extraction; (4) removing the adsorption pen, and performing preliminary water removal at low temperature; and (5) installing a pre-column and a chromatographic column II, inserting the adsorption pen into a GC sample inlet for thermal desorption, simultaneously opening a V4 valve, controlling outlet flow at 20-40 ml / min, and controlling the temperature of the pre-column and the chromatographic column II during and after desorption. The present application uses an adsorption pen to extract polycyclic aromatic hydrocarbons and halogenated polycyclic aromatic hydrocarbons in water, removes water by using a pre-column, and performs gas chromatography mass spectrometry analysis, thereby overcoming the problems of large amount of organic solvent, complex operation, poor reproducibility, and water and solvent interference in the adsorption pen extraction technology in the prior art.

The invention belongs to the technical field of organic base detection and analysis, and particularly relates to application of 2-(2-pyrrolyl) pyridine as an internal standard substance for gas chromatography-mass spectrometry detection of nornicotine in cigarette mainstream smoke and a detection method. The 2-(2-pyrrolyl) pyridine provided by the invention is used as an internal standard substance for gas chromatography-mass spectrometry detection of nornicotine in cigarette mainstream smoke. Based on the closeness of the molecular polar surface area PSA, the hydrophobicity LogP and the retention index RI of the internal standard substance and the target alkaloid, the selected 2-(2-pyrrolyl) pyridine and nornicotine have similar structures and similar physicochemical properties, and can be highly matched with the target alkaloid in the aspects of pretreatment recovery rate, chromatographic retention behavior and mass spectrum response characteristics; the quantitative precision of a detection result is improved and the cost of an internal standard substance is reduced.

The invention relates to a quantitative analysis method of nicotinic acid and nicotinamide in tobacco leaves, which comprises the following steps: 1) sample pretreatment: accurately weighing a tobacco leaf sample, adding a mixed solvent of methanol, water and dichloromethane, carrying out oscillation extraction and centrifugal treatment, taking supernatant liquid, and carrying out freeze drying treatment to obtain freeze-dried residues; adding pyridine and BSTFA into the freeze-dried residues to carry out silanization derivation reaction to form a nicotinic acid derivative and a nicotinamide derivative, namely a sample to be detected; 2) preparing a standard solution and drawing a standard curve; 3) sample analysis: performing gas chromatography-mass spectrometry analysis on the to-be-detected sample to obtain chromatographic peaks and mass spectrum peaks of the derivatives of nicotinic acid and nicotinamide; and according to the retention time of the chromatographic peak and mass spectrum characteristic ion peak qualitative analysis, the content of nicotinic acid and nicotinamide in the tobacco leaf sample is calculated through external standard method quantitative analysis. The quantitative analysis method is simple, convenient, efficient and high in sensitivity and accuracy.

The application discloses a seasoning food flavor source discrimination method, device, equipment and medium, and relates to the cross technical field of computer technology and analytical chemistry, and comprises the following steps: performing gas chromatography mass spectrometry on a seasoning food sample to obtain gas chromatography mass spectrometry flavor fingerprint data of the seasoning food; performing data enhancement processing based on the gas chromatography mass spectrometry flavor fingerprint data of the seasoning food to obtain a gas chromatography mass spectrometry flavor fingerprint enhanced data set; and combining the gas chromatography mass spectrometry flavor fingerprint enhanced data set with a flavor source discrimination model to obtain a seasoning food flavor source discrimination result. The application solves the problem of poor data comparability under different detection conditions by time retention calibration, greatly improves the discrimination accuracy by combining model analysis, simplifies the detection process, realizes efficient conversion from samples to results, is suitable for large-scale sample detection, and provides reliable technical support for food quality control and supervision.

The application discloses a method for determining the content of polychlorobenzene and polychlorobutadiene in ambient air, which comprises the following steps: (1) using a composite adsorption tube to adsorb and collect target substances in air, and then pressurizing and sealing the composite adsorption tube after the collection is completed; (2) placing the composite adsorption tube with the adsorbed target substances in a thermal desorption instrument to perform primary thermal desorption, and then introducing the target substances into a gas chromatography mass spectrometry analysis system after secondary focusing by a cold trap for analysis; the target substances are polychlorobenzene and polychlorobutadiene. The method can realize synchronous and accurate qualitative and quantitative analysis of wide-boiling-point chlorine-containing organic substances in a complex environmental matrix.

The invention discloses a VOCs spatial and temporal distribution rule analysis system and method, and relates to the technical field of air pollution detection, and the VOCs spatial and temporal distribution rule analysis method comprises the steps: laying a VOCs monitoring point network; performing multi-period sampling; component analysis is carried out by adopting a pre-concentration-gas chromatography-mass spectrometry technology; constructing a VOCs concentration space distribution model, and generating a space-time distribution map; vOCs component sources are analyzed, and main pollution source types are identified; and constructing a VOCs spatial and temporal distribution characteristic index system. A space point distribution strategy is adopted, and it is ensured that monitoring point position coverage has representativeness; a sampling time sequence and frequency arrangement are optimized, and the accuracy and integrity of component analysis are improved; an optimized spatial interpolation algorithm is introduced, so that the accuracy and reliability of a spatial distribution map are improved; a plurality of source analysis methods are integrated, and limitation of a single model is eliminated through model cross validation.

The invention provides a method for rapidly screening aroma-producing bacillus to improve the quality of cigar tobacco leaves, and belongs to the technical field of agricultural microorganisms. On the basis of bacillus 16S rDNA (ribosomal deoxyribonucleic acid) sequence analysis and fermentation liquor smell evaluation, volatile aroma components of strain fermentation liquor and fermented cigar tobacco powder are analyzed by using HS-SPME-GC-MS (headspace solid-phase microextraction-gas chromatography-mass spectrometry) and an electronic nose, and excellent aroma-producing strains are screened by combining a multivariate analysis method. And the fermentation effect on the cigar tobacco leaves is verified by simulating fermentation. Results show that seven kinds of 50 bacillus strains are identified, and the smell difference of fermentation liquor smell evaluation is large. 177 volatile components are identified in strain fermentation liquor, 7 strains have relatively high aroma producing characteristics, and 2, 3-butanedione, 2-nonyl alcohol and isoamyl alcohol are common aroma components of the strains. Two strains with the highest volatile components and large difference in the fermented tobacco powder are screened out through PCA and clustering analysis, 1-F-2 can generate high-content alcohol, pyrazine, ketone and other components, and DMMJ-4 can generate high-content alcohol, pyridine, ketone and other components. The two strains are used for fermentation, so that the content of volatile aroma components of the cigar tobacco leaves is obviously improved, and the flavor characteristics and the quality characteristics are also improved to different extents. Therefore, the invention can provide reference for screening and application of cigar tobacco leaf microbial fermentation strains.

The application relates to the technical field of analytical chemistry, and specifically discloses a method for detecting microplastics in blood plasma based on a thermal cracking-gas chromatography mass spectrometry combined technique. The method for detecting microplastics in blood plasma disclosed by the application comprises the following steps: (1) pretreatment: uniformly mixing a blood plasma sample with a Tris-HCl solution, reacting at 55-65 DEG C to obtain a cracking solution; then adding a calcium chloride solution and a protease K solution to digest, then shaking after temperature reduction to room temperature, and heating to 55-65 DEG C for heat preservation treatment to obtain a pretreatment solution; vacuum filtration on a glass fiber membrane, elution, and obtaining a sample to be measured; (2) measuring by a thermal cracking-gas chromatography mass spectrometry combined instrument. The method provided by the application solves the problems that the existing blood plasma digestion method destroys microplastics, is easy to damage the instrument and cannot be used for large batch processing, and has good quantitative applicability, and can be accurately and reliably used for quantitative analysis of various microplastics in blood plasma.

This invention discloses a wastewater source tracing detection method based on full two-dimensional gas chromatography-mass spectrometry, belonging to the field of environmental monitoring technology. The method includes: establishing a source-end transformation fingerprint chain library based on the connection relationships between parent peak clusters, associated peak clusters, and transformation peak clusters in the peak cluster families corresponding to the source-end sample sequence; obtaining a receptor peak cluster family table; performing a chain comparison between the source-end transformation fingerprint chain library and the receptor peak cluster family table to determine candidate source peak cluster families and overlapping peak cluster families; performing peak cluster family exclusion stripping to generate a confirmed source portion and a set of residual unexplained peak cluster families; merging the residual unexplained peak cluster family set for unknown sources to form an unknown transformation chain; and combining this with the confirmed source portion to output the wastewater source tracing detection results. This invention improves the completeness, specificity, and interpretability of wastewater source tracing detection results.

The invention discloses a citrus chachiensis hortorum fingerprint as well as a construction method and application thereof, and belongs to the technical field of analysis and detection. The method comprises the following steps: extracting and analyzing volatile components of the citrus chachiensis hortorum by adopting a headspace-gas chromatography-mass spectrometry method, and extracting a mass spectrum of a characteristic compound through unknown substance analysis software, so as to obtain the citrus chachiensis hortorum fingerprint spectrum. The invention also discloses a citrus chachiensis hortorum fingerprint spectrum and application thereof in citrus chachiensis hortorum identification and traceability. According to the citrus chachiensis hortorum fingerprint spectrum, a plurality of volatile substances serve as quality indexes of citrus chachiensis hortorum, and accurate and comprehensive quality control over citrus chachiensis hortorum can be achieved.

The invention provides a compound, a polymer containing the structure of the compound and a rock debris mark detection method. The structural formula of the compound provided by the invention is as shown in formula I: # imgabs0 #, the compound is reacted with acrylamide and N, N-methylene bisacrylamide under the action of an initiator to obtain the polymer, namely the water-in-oil polymer nanoparticle dispersion liquid, and the water-in-oil polymer nanoparticle dispersion liquid can be used as a tracer to adsorb and mark rock debris without purification. The rock debris marking detection method comprises the following steps: injecting the water-in-oil polymer nanoparticle dispersion liquid and drilling fluid into a stratum during rock debris logging, adsorbing and marking the generated rock debris, extracting the marked rock debris by using tetrahydrofuran, collecting an extracting solution, concentrating and drying, and thus obtaining the water-in-oil polymer nanoparticle. And detecting the polymer nanoparticles by using a thermal cracking-gas chromatograph-mass spectrometer.

The utility model belongs to the technical field of gas chromatographs, and particularly relates to a gas chromatography-mass spectrometry combined detector which comprises a machine body, a handle is hinged to the outer side of the machine body through a damping shaft, a square plate is connected into the machine body in a sliding mode, and a threaded rod is fixedly connected to the lower end of the square plate. The lower end of the threaded rod is fixedly connected with a base plate, the interior of the machine body is rotationally connected with a limiting block, and the lower end of the limiting block is fixedly connected with a limiting sleeve. Through the arrangement of the threaded rod, the limiting sleeve and other components, the limiting sleeve can be rotated to make threaded movement with the threaded rod, so that the position of the base plate is adjusted, the base plate is matched with the lifting handle to keep the equipment stable, and secondary adjustment is not needed when the equipment is moved on the same plane; the problems that a bottom support of a gas chromatography-mass spectrometry combined detector cannot be adjusted when the gas chromatography-mass spectrometry combined detector is used, and the gas chromatography-mass spectrometry combined detector is not stable when placed are solved.

The invention provides a high-sensitivity detection method for quinclorac in grains and honey. The high-sensitivity detection method comprises the following steps: S1, extracting; S2, deriving; S3, redissolving and on-machine analysis of GCMSMS (Gas Chromatography Mass Spectrometry) and LCMSMS (Liquid Chromatography Mass Spectrometry). According to the technical scheme, iodoethane is adopted to react with quinclorac under the alkaline condition to generate a new compound 3, 7-dichloro-8-quinoline carboxylic acid ethyl ester, the derivation reaction speed is high, and the reaction can be completed within 60 minutes; and the used derivatization reagent is safe to use and low in cost. According to the method, the derivative 3, 7-dichloro-8-quinoline carboxylic acid ethyl ester of quinclorac is quantitatively detected through GCMSMS, the sensitivity is high, the quantification limit is far lower than that in an existing literature method, and the harsh requirement of the market for quinclorac detection in food can be met.

To provide wood powder resin composite materials with excellent odour resistance.SOLUTION: A wood powder resin composite material comprises steamed wood powder and resin, and the steamed wood power has a ratio of a peak height of acetic acid identified by total ion chromatogram obtained by gas chromatography mass spectrometry to a peak height of carbon dioxide identified by the total ion chromatogram of 0.1 or less.SELECTED DRAWING: None

The invention discloses a biomimetic fluid-based medical equipment phthalate migration test method, which is characterized by comprising the following steps: (1) taking artificial saliva as a leaching solution; the method comprises the following steps: soaking a to-be-detected medical equipment pipeline sample in a glassware according to the ratio of the sum of the internal area and the external area (cm < 2 >) to the volume (mL) of a leaching solution of 2: 1, and standing for 24 hours at the constant temperature of 37 + / -1 DEG C; (2) transferring a proper amount of the extract liquid into a test tube, then adding n-hexane, fully oscillating for 10 minutes, then centrifuging, sucking an upper-layer n-hexane solution by using a glass dropper, and extracting by using a solid-phase extraction column to obtain an extracting solution; repeating the extraction step twice; (3) mixing the three extracting solutions, evaporating the mixed extracting solutions in a vacuum rotary evaporator until the mixed extracting solutions are nearly dry, and then adding n-hexane to dissolve the mixed extracting solutions to obtain a detection solution; and analyzing the detection liquid by using a gas chromatograph-mass spectrometer, and testing the migration volume of the phthalate.

The application discloses a method for rapidly detecting butyric acid and isomers thereof in liquor, which does not need any pretreatment process and a large amount of organic solvents, directly takes 0.5-3ml of a liquor sample and adds the sample into a sample bottle of a rapid gas chromatography-PTR photochemical ionization source-time of flight mass spectrometer, selects appropriate rapid gas chromatography mass spectrometry conditions, and utilizes the rapid gas chromatography-PTR photochemical ionization source-time of flight mass spectrometer to rapidly complete detection of butyric acid and isomers thereof in the liquor. The method established by the application does not need any pretreatment process and a large amount of organic solvents, can rapidly detect butyric acid and isomers thereof in the liquor within five minutes, and provides a strong means for acidity and taste adjustment of the liquor.