CN106018654A - Tobacco column metabonomics analysis method based on gas chromatographic mass spectrometry - Google Patents
Tobacco column metabonomics analysis method based on gas chromatographic mass spectrometry Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
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Abstract
The invention discloses a tobacco column metabonomics analysis method based on gas chromatographic mass spectrometry. The tobacco column metabonomics analysis method comprises the steps of sample pretreatment, chromatography-mass spectrography separation, identification of metabolite structures, quantitative analysis of metabolites and data analysis. Polar metabolites and nonpolar metabolites of a tobacco column are respectively extracted by adopting a polar solvent and a nonpolar solvent, all metabolites collected by gas chromatography-mass spectrography are qualitatively identified by adopting a preservation index and a mass spectrographic spectrogram database, and all collected metabolites are quantitatively analyzed by adopting a non-target quantitative analysis method. By adopting the method, an important reference can be provided for the tobacco column metabonomics related research.
Description
Technical field
The invention belongs to technical field of analytical chemistry, be specifically related to a kind of tobacco styles metabolism based on gaschromatographic mass spectrometry
Group credit analysis method.
Background technology
Metabolism group is because of pathology physiological stimulation and the change such as gene, environment caused dynamically multiparameter generation to biosystem
Thank to the qualitative, quantitative research of response.Metabolism group is the research field developed rapidly in recent years, proposes metabolism from 1997
Since the concept that group is learned, achieve fruitful achievement, especially at plant metabolism in plant, animal and microbe research field
Group learns the many domestic and international well-known universities of research aspect and research unit has all carried out correlational study work.
The analysis method that metabolism group institute uses mainly has nuclear magnetic resonance spectrometry, liquid chromatography-mass spectrometry, gas phase
Chromatographic mass spectrometry method etc..Up to the present, gaschromatographic mass spectrometry owing to its running cost is low, qualitative, quantitative ability strong and to metabolism
The features such as the broad covered area of thing, have become as Plant Metabolome and study one of most important analysis method.
Nicotiana tabacum L. is the very important a kind of model plant of Plant Physiology research, is also that very important a kind of economy is planted
Thing.At present, people have carried out substantial amounts of research at cigarette quality, the aspect such as disease-resistant, pest-resistant, and these researchs are mainly from base
The aspect such as cause, environment is launched, and the relevant report conducted a research from the angle of metabolism group is less.This is primarily due to metabolism
Group is learned and is still a kind of constantly improving and the research method of development at present.Owing to Nicotiana tabacum L. is the Main Economic organ of Nicotiana tabacum L., people couple
Research in Nicotiana tabacum L. is concentrated mainly on Nicotiana tabacum L..Tobacco styles is to connect Nicotiana tabacum L. stigma and the bridge of ovary, educates with tobacco hybridization
Plant directly related, be the important object of different cultivars Nicotiana tabacum L. intermolecular hybrid affinity research.Hence set up the metabolism group of tobacco styles
Science study method is significant.
Summary of the invention
It is an object of the invention to provide a kind of tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry.
The object of the present invention is achieved like this, including sample pre-treatments, chromatographic mass spectrometry separate, metabolite structures identify,
The quantitative analysis of metabolite, data analysis step, specifically include:
A, sample pre-treatments: be cut into small pieces by fresh tobacco styles sample and insert mortar, add liquid nitrogen freezing, grind, freezing dry
Obtain lyophilizing tobacco styles sample after dry, preserve in 4 DEG C；
B, chromatographic mass spectrometry separate:
1) extraction of polar metabolite and derivatization: the lyophilizing tobacco styles sample accurately weighing 20.0 mg is centrifuged in 1.5 mL
Pipe, adds 370 μ L methanol, 480 μ L deionized waters, 450 μ L methyl tertiary butyl ether(MTBE)s and 200 μ L inner mark solutions, ultrasonic, from
The heart, takes off clear liquid 600 μ L, puts into freeze dryer centrifugal concentrating 2 hours to remove solvent, takes out sample and add 100 μ L methoxamine
Solution, 37 DEG C of constant temperature oximate 90 min, add 80 μ L MSTFA, 37 DEG C of constant temperature silanization 30 min, the sample derived turns
To gas chromatography mass spectrometer analysis, sample size 1 μ L；
2) extraction of nonpolar metabolite: accurately weigh 100.0 mg lyophilizing tobacco styles samples, add 4.9 mL dichloromethane
With 100 μ L inner mark solutions, ultrasonic 30 min, it is centrifuged, takes supernatant 2 mL nitrogen and dry up, add 200 μ L dichloromethane and redissolve,
After redissolution, extracting solution goes to gas chromatography mass spectrometer analysis, sample size 1 μ L；
C, metabolite structures are identified: use mass spectrum to deconvolute and spectrogram library searching, retention index, n-compound checking combine
Method to carry out compound qualitative；
D, the quantitative analysis of metabolite: the peak area of the peak area of metabolite with internal standard substance is divided by, it is thus achieved that relative quantitation information,
Specific formula for calculation is as follows:
Wherein, CxAnd C1Represent metabolite x and interior target content, μ g/g respectively；
AxAnd A1Represent the chromatographic peak area of metabolite x and content respectively；
E, data analysis: the quantitative analysis results of polar metabolite and nonpolar metabolite in each analysis sample is united
Meter, uses principal component analysis and cluster analysis as multivariable technique, carries out the relativeness research between sample, use
T inspection analyzes method as univariate statistics, finds key metabolites.
The present invention uses polar solvent and non-polar solven extracted tobacco style polar metabolite and nonpolar metabolism respectively
Thing, all metabolite using retention index and mass spectrogram storehouse Qualitative Identification gaschromatographic mass spectrometry to be gathered, use non-target
All metabolite that quantitative analysis method quantitative analysis is gathered.Being established as of the method is carried out tobacco styles metabolism group and is correlated with
Research provides important reference.
Accompanying drawing explanation
Fig. 1 is principal component analysis shot chart (left) and the load diagram (right) of alata and K326 style；
Fig. 2 is alata and K326 style metabolite Unsupervised clustering analysis chart；
Fig. 3 is the T assay volcano figure of alata and K326 style metabolite；
Fig. 4 is the gaschromatographic mass spectrometric analysis total ion current figure of tobacco styles polar metabolite；
Fig. 5 is the gaschromatographic mass spectrometric analysis total ion current figure of the nonpolar metabolite of tobacco styles.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is further illustrated, but never in any form to the present invention in addition
Limiting, based on present invention teach that any conversion or replacement made, belonging to protection scope of the present invention.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry of the present invention, locates including before sample
Reason, chromatographic mass spectrometry separation, metabolite structures qualification, the quantitative analysis of metabolite, data analysis step, specifically include:
A, sample pre-treatments: be cut into small pieces by fresh tobacco styles sample and insert mortar, add liquid nitrogen freezing, grind, freezing dry
Obtain lyophilizing tobacco styles sample after dry, preserve in 4 DEG C；
B, chromatographic mass spectrometry separate:
1) extraction of polar metabolite and derivatization: the lyophilizing tobacco styles sample accurately weighing 20.0 mg is centrifuged in 1.5 mL
Pipe, adds 370 μ L methanol, 480 μ L deionized waters, 450 μ L methyl tertiary butyl ether(MTBE)s and 200 μ L inner mark solutions, ultrasonic, from
The heart, takes off clear liquid 600 μ L, puts into freeze dryer centrifugal concentrating 2 hours to remove solvent, takes out sample and add 100 μ L methoxamine
Solution, 37 DEG C of constant temperature oximate 90 min, add 80 μ L MSTFA, 37 DEG C of constant temperature silanization 30 min, the sample derived turns
To gas chromatography mass spectrometer analysis, sample size 1 μ L；
2) extraction of nonpolar metabolite: accurately weigh 100.0 mg lyophilizing tobacco styles samples, add 4.9 mL dichloromethane
With 100 μ L inner mark solutions, ultrasonic 30 min, it is centrifuged, takes supernatant 2 mL nitrogen and dry up, add 200 μ L dichloromethane and redissolve,
After redissolution, extracting solution goes to gas chromatography mass spectrometer analysis, sample size 1 μ L；
C, metabolite structures are identified: use mass spectrum to deconvolute and spectrogram library searching, retention index, n-compound checking combine
Method to carry out compound qualitative；
D, the quantitative analysis of metabolite: the peak area of the peak area of metabolite with internal standard substance is divided by, it is thus achieved that relative quantitation information,
Specific formula for calculation is as follows:
Wherein, CxAnd C1Represent metabolite x and interior target content, μ g/g respectively；
AxAnd A1Represent the chromatographic peak area of metabolite x and content respectively；
E, data analysis: the quantitative analysis results of polar metabolite and nonpolar metabolite in each analysis sample is united
Meter, uses principal component analysis and cluster analysis as multivariable technique, carries out the relativeness research between sample, use
T inspection analyzes method as univariate statistics, finds key metabolites.
Sample particle diameter after grinding in step A is less than 40 mesh.
In step A, cryodesiccated vacuum is 0.18 mbar, and temperature is-6 DEG C.
Step B 1) described in inner mark solution be 100 μ g/mL to hydroxyl coumaric acid aqueous solution.
Step B 1) in ultrasonic frequency be 25 ~ 45 kHz, the time is 20 ~ 30 min.
Step B 1) in centrifugal centrifugal force >=5000g.
Step B 1) in the vacuum of freeze dryer centrifugal concentrating be 0.18 mbar, temperature is-6 DEG C.
Step B 1) described in the concentration of methoxamine solution be 20 mg/ml.
Step B 2) described in the dichloromethane solution of the peach aldehyde that inner mark solution is 100 μ g/mL；Described centrifugal from
Mental and physical efforts >=10000g.
In step B, chromatographiccondition is: chromatographic column is DB-5MS (30 mm × 0.25, m × 0.25 μm), journey
Sequence Elevated Temperature Conditions is 60 DEG C and keeps 1 min, 5 DEG C/min to rise to 280 DEG C, keeps 15 min；Injector temperature is 250 DEG C；
Sampling volume is 1 μ L；Carrier gas is helium；Post flow is 1.1 mL/min；Split ratio is 20:1；Mass spectral analysis condition is: transmission
Line temperature is 230 DEG C；Ion source temperature 210 DEG C；The solvent delay time of nonpolar metabolite is 2 min, polarity derivatization
The solvent delay time of sample is 7 min；Mass scan range is m/z 35-400；Scanning of the mass spectrum speed is 5 Hz.
It is analyzed as a example by the style of phase Nicotiana tabacum L. in full bloom below, particularly as follows:
1, sample pre-treatments
1.1 experiment reagents and device
Methanol (chromatographic grade) is bought in Merck company of Germany；Ultra-pure water is prepared by Millipore purification system.To hydroxyl tonkabean
Acid and peach aldehyde (internal standard compound) are bought in lark prestige company；0#Light diesel (calculating for retention index) refuels purchased from locality
Stand.PE Clarus 600 GC-MS gas chromatography mass spectrometer (PE company of the U.S.)；SB-50D ultrasonic extraction instrument (the new sesame in Ningbo
Biotech inc)；DB-5 MS capillary chromatographic column (30 mm × 0.25, m × 0.25 the μm) (U.S.
Agilent company)；MILLI-Q water purification machine (MILLIPORE company)；(system in Beijing Jing founds the limited public affairs of centrifuge to LD5-2A centrifuge
Department)；CP2245 analytical balance (sensibility reciprocal 0.0001g, Sartorious company of Germany).
1.2 sample pre-treatments
Prepared by sample: be cut into small pieces by fresh tobacco styles sample and put into mortar, add liquid nitrogen freezing, and grind rapidly
(less than 40 mesh).Milled sample proceeds to rapidly freeze dryer to carry out lyophilization (vacuum 0.18 mbar, temperature-6 DEG C, during lyophilizing
Between 72 h), remove moisture, be placed in 4 DEG C of Refrigerator stores.
Sample extraction and derivatization: metabolite in tobacco styles is divided into polar metabolite and nonpolar metabolite.Wherein
The extraction of polar metabolite and derivatization method be: the lyophilizing tobacco styles sample accurately weighing 20.0 mg is centrifuged in 1.5 mL
Pipe, adds 370 μ L methanol, 480 μ L deionized waters, 450 μ L methyl tertiary butyl ether(MTBE)s and 200 μ L inner mark solutions (fragrant to hydroxyl
Bean aqueous acid 100 μ g/mL), ultrasonic 30 min, centrifugal (centrifugal force >=5000g), take off clear liquid 600 μ L, put into freeze dryer
Within 2 hours, to remove solvent, it is molten that taking-up sample adds 100 μ L methoxamine to (vacuum 0.18 mbar, temperature-6 DEG C) centrifugal concentrating
Liquid (20 mg/mL, pyridine solution), 37 DEG C of constant temperature oximate 90 min, add 80 μ L MSTFA, 37 DEG C of constant temperature silanizations 30
Min, the sample derived goes to gas chromatography mass spectrometer analysis, sample size 1 μ L.
The extracting method of nonpolar metabolite: accurately weigh 100.0 mg lyophilizing tobacco styles samples, add 4.9 mL bis-
Chloromethanes and 100 μ L inner mark solutions (dichloromethane solution of peach aldehyde, 100 μ g/mL), ultrasonic 30 min, centrifugal (centrifugal force >=
10000g), taking supernatant 2 mL nitrogen and dry up, add 200 μ L dichloromethane and redissolve, after redissolution, extracting solution goes to gas chromatogram
Spectrometer analysis, sample size 1 μ L.
1.3 chromatograph mass spectrum analysis conditions
Contrast for convenience of polar metabolite and nonpolar metabolite, the chromatographic separation condition of two kinds of metabolite and mass spectrum in this method
Analysis condition essentially identical (except solvent clipping time), concrete chromatographic mass spectrometry condition is as follows:
Chromatographiccondition: chromatographic column is DB-5MS (30 mm × 0.25, m × 0.25 μm), and temperature programming condition is 60
DEG C keep 1 min, 5 DEG C/min rise to 280 DEG C, keep 15 min；Injector temperature is 250 DEG C；Sampling volume is 1 μ L；
Carrier gas is helium；Post flow is 1.1 mL/min；Split ratio is 20:1.
Mass spectral analysis condition: transmission line temperature is 230 DEG C；Ion source temperature 210 DEG C；The solvent of nonpolar metabolite prolongs
Time is 2 min late, and the solvent delay time of polarity derivatization sample is 7 min；Mass scan range is m/z 35-400；Matter
Spectrum scanning speed is 5 Hz.
The Structural Identification of 1.4 metabolite
Owing to metabolism group is concerned with the situation of change of all metabolite that can detect someway, and wherein most
Metabolite is likely to not pay close attention in traditional metabolite analysis, and therefore the Structural Identification to unknown metabolite is metabolism group
Highly important research contents.This experiment uses mass spectrum to deconvolute and spectrogram library searching, retention index, n-compound checking phase
In conjunction with method to carry out compound qualitative.
Mass spectrum deconvolutes and spectrogram library searching: owing to all metabolite cannot be completely separated by gas chromatogram, therefore gas phase
The mass spectrum put sometime that chromatograph mass spectrum analysis instrument obtains is in practice likely to be the mixing of the mass spectrum of several compound.This
Experiment uses AMDIS(V 2.7) software carries out mass spectrum and deconvolutes and peak identification, it is thus achieved that eliminate substrate background and fused peaks
Pure mass spectrum.NIST MS Search 2.0 is used to join NIST mainlib data base, wileyregistry8e data base
The preliminary structure carrying out metabolite with fiehn metabolism group data base is qualitative.
Retention index is qualitative: owing to metabolite retention index on same type gas chromatographic column is the most stable, this reality
Testing employing retention index, to carry out supplementary structure qualitative.Method particularly includes: by carbon number continuous print linear paraffin (0# diesel oil) according to this
The chromatographic mass spectrometry method of experiment is analyzed, it is thus achieved that the retention time of these alkane, then carries out metabolite according to below equation
Retention index calculate:
Wherein:RI x Refer to that retention time is in the retention index that carbon number is certain metabolite between n and n+1；N represents linear paraffin
Carbon number；tx、tn、tn+1Refer to respectively when metabolite x, carbon number are the reservation of linear paraffin etc. that the linear paraffin of n, carbon number are n+1
Between.
N-compound is verified: be standardized compound checking to through mass spectral database and retention index compound qualitatively.I.e.
N-compound is analyzed according to this chromatographic mass spectrometry method tested, by the retention time obtained and mass spectrum and Nicotiana tabacum L.
In post sample, compound undetermined is compared, if both of which can be coincide, the most finally determines the qualitative results of this compound.
The quantitative analysis method of 1.5 metabolite
Owing to or cannot be difficult to obtain the n-compound of all metabolite, and metabolism group is typically without absolute quantitation,
The quantitative analysis of metabolite uses the method for relative quantification.I.e. assume that metabolite response on the detector is consistent with internal standard substance,
The peak area of the peak area of metabolite with internal standard substance is divided by, it is thus achieved that relative quantitation information.Specific formula for calculation is as follows:
Wherein, CxAnd CIRepresent metabolite x and interior target content, A respectivelyxAnd AIRepresent metabolite x and interior target chromatographic peak respectively
Area.
1.6 data analysis
The quantitative analysis results of polar metabolite and nonpolar metabolite in each analysis sample is integrated into Excel data
Table (peak table), in peak table, the quantitative information of some metabolite is included into specific a (row), in order to metabolism between multisample
The statistical analysis of thing content.Use principal component analysis and cluster analysis as multivariable technique, the phase between research sample
To relation research, use T inspection to analyze method as univariate statistics, find key metabolites.
To be embodied as case, the present invention will be further described below:
Embodiment 1
The metabolism group research of different cultivars (alata and K326) tobacco styles
Experiment material: each 6 of the style sample of alata and the K326 kind Nicotiana tabacum L. of phase in full bloom, sample is prepared according to " before sample
Processing " the described method of part carries out.
Experimental technique:
The extraction of polar metabolite and derivatization method be: accurately weighs the lyophilizing tobacco styles sample of 20.0 mg in 1.5 mL
Centrifuge tube, adds 370 μ L methanol, 480 μ L deionized waters, 450 μ L methyl tertiary butyl ether(MTBE)s and 200 μ L inner mark solutions (to hydroxyl
Basic note bean aqueous acid 100 μ g/mL), ultrasonic 30 min, centrifugal (centrifugal force >=5000g), take off clear liquid 600 μ L, put into and freeze
Dry machine (vacuum 0.18 mbar, temperature-6 DEG C) centrifugal concentrating 2 hours, removes solvent, takes out sample and adds 100 μ L methoxamine
Solution (20 mg/mL, pyridine solution), 37 DEG C of heating in water bath 90 min, add 80 μ L MSTFA, 37 DEG C of water-bath 30 min, spread out
The sample given birth to goes to gaschromatographic mass spectrometric analysis instrument analysis, sample size 1 μ L.
The extracting method of nonpolar metabolite: accurately weigh the lyophilizing tobacco styles sample of 100.0 mg, add 4.9 mL
Dichloromethane and 100 μ L inner mark solutions (dichloromethane solution of peach aldehyde, 100 μ g/mL), ultrasonic 30 min, centrifugal (centrifugal force
>=10000g), take supernatant 2 mL nitrogen and dry up, add 200 μ L dichloromethane and redissolve, after redissolution, extracting solution goes to gas phase color
Spectrum mass spectrometer analysis, sample size 1 μ L.
Chromatographiccondition: chromatographic column is DB-5MS (30 mm × 0.25, m × 0.25 μm) temperature programming condition
Being 60 DEG C keeps 1 min, 5 DEG C/min to rise to 280 DEG C, keeps 15 min；Injector temperature is 250 DEG C；Sampling volume is 1
μL；Carrier gas is helium；Post flow is 1.1 mL/min；Split ratio is 20:1.
Mass spectral analysis condition: transmission line temperature is 230 DEG C；Ion source temperature 210 DEG C；The solvent of nonpolar metabolite prolongs
Time is 2 min late, and the solvent delay time of polarity derivatization sample is 7 min；Mass scan range is m/z 35-400；Matter
Spectrum scanning speed is 5 Hz.Use mass spectrum to deconvolute and spectrogram library searching, retention index, n-compound verify the side combined
It is qualitative that method carries out compound.The method using internal standard relative quantification is carried out quantitatively.
The Structural Identification of metabolite: use mass spectrum to deconvolute and spectrogram library searching, retention index, n-compound checking phase
In conjunction with method to carry out compound qualitative.Using AMDIS(V 2.7) software carries out mass spectrum and deconvolutes and peak identification, it is thus achieved that go
Except substrate background and the pure mass spectrum of fused peaks.Use NIST MS Search 2.0 join NIST mainlib data base,
The preliminary structure that wileyregistry8e data base and fiehn metabolism group data base carry out metabolite is qualitative.Use and retain
It is qualitative that index carries out supplementary structure.Method particularly includes: the chromatograph that carbon number continuous print linear paraffin (0# diesel oil) is tested according to this
Mass spectrometry method is analyzed, it is thus achieved that the retention time of these alkane, then carries out the retention index of metabolite according to below equation
Calculate:
Wherein: RIxRefer to that retention time is in the retention index that carbon number is certain metabolite between n and n+1；N represents linear paraffin
Carbon number；tx、tn、tn+1Refer to respectively when metabolite x, carbon number are the reservation of linear paraffin etc. that the linear paraffin of n, carbon number are n+1
Between.
The quantitative analysis of metabolite: owing to or cannot be difficult to obtain the n-compound of all metabolite, and metabolism
Group is learned typically without absolute quantitation, and the quantitative analysis of metabolite uses the method for relative quantification.I.e. assume that metabolite is at detector
On response consistent with internal standard substance, the peak area of the peak area of metabolite with internal standard substance is divided by, it is thus achieved that relative quantitation information.Tool
Body computing formula is as follows:
Wherein, Cx and CI represents metabolite x and interior target content respectively, Ax and AI represents metabolite x and interior target chromatograph respectively
Peak area.
Data analysis: use principal component analysis and cluster analysis as multivariable technique, the phase between research sample
To relation research, use T inspection to analyze method as univariate statistics, find key metabolites.
Experimental result: experimental result is listed in table 1, table 2, Fig. 1, Fig. 2, Fig. 3.Alata and K326 exists as can be seen from Figure 1
There is significantly separation on the two dimensional surface of principal component analysis shot chart (Fig. 1 is left), illustrate that the style metabolite of both Nicotiana tabacum L.s is deposited
In significantly difference, and concrete difference metabolite is embodied on principal component analysis shot chart (Fig. 1 is right).
Metabolite data carrying out cluster analysis (Fig. 2) find, two breed formations of K326 and alata two are the most poly-
Class, and the hierarchical relationship between two indivedual samples of big apoplexy due to endogenous wind finds full expression the most in fig. 2.
In order to find further and verify diversity metabolite, all metabolite are carried out T check analysis, by arriving of analyzing
P value and class between average ratio (alata is divided by K326) make volcano figure (Fig. 3), take p value less than 0.05, and average ratio more than 2 or
Metabolite less than 0.5 marks by yellow in the drawings.Red big and TN90 two can be can be visually seen from the figure of volcano grow tobacco style
Significance difference opposite sex metabolite.
The structure-characterized result of table 1 part style metabolite
The relative quantitative assay peak table of table 2 part style metabolite
Claims (10)
1. a tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry, it is characterised in that locate before including sample
Reason, chromatographic mass spectrometry separation, metabolite structures qualification, the quantitative analysis of metabolite, data analysis step, specifically include:
A, sample pre-treatments: be cut into small pieces by fresh tobacco styles sample and insert mortar, add liquid nitrogen freezing, grind, freezing dry
Obtain lyophilizing tobacco styles sample after dry, preserve in 4 DEG C；
B, chromatographic mass spectrometry separate:
1) extraction of polar metabolite and derivatization: the lyophilizing tobacco styles sample accurately weighing 20.0 mg is centrifuged in 1.5 mL
Pipe, adds 370 μ L methanol, 480 μ L deionized waters, 450 μ L methyl tertiary butyl ether(MTBE)s and 200 μ L inner mark solutions, ultrasonic, from
The heart, takes off clear liquid 600 μ L, puts into freeze dryer centrifugal concentrating 2 hours to remove solvent, takes out sample and add 100 μ L methoxamine
Solution, 37 DEG C of constant temperature oximate 90 min, add 80 μ L MSTFA, 37 DEG C of constant temperature silanization 30 min, the sample derived turns
To gas chromatography mass spectrometer analysis, sample size 1 μ L；
2) extraction of nonpolar metabolite: accurately weigh 100.0 mg lyophilizing tobacco styles samples, add 4.9 mL dichloromethane
With 100 μ L inner mark solutions, ultrasonic 30 min, it is centrifuged, takes supernatant 2 mL nitrogen and dry up, add 200 μ L dichloromethane and redissolve,
After redissolution, extracting solution goes to gas chromatography mass spectrometer analysis, sample size 1 μ L；
C, metabolite structures are identified: use mass spectrum to deconvolute and spectrogram library searching, retention index, n-compound checking combine
Method to carry out compound qualitative；
D, the quantitative analysis of metabolite: the peak area of the peak area of metabolite with internal standard substance is divided by, it is thus achieved that relative quantitation information,
Specific formula for calculation is as follows:
Wherein, CxAnd C1Represent metabolite x and interior target content, μ g/g respectively；
AxAnd A1Represent the chromatographic peak area of metabolite x and content respectively；
E, data analysis: the quantitative analysis results of polar metabolite and nonpolar metabolite in each analysis sample is united
Meter, uses principal component analysis and cluster analysis as multivariable technique, carries out the relativeness research between sample, use
T inspection analyzes method as univariate statistics, finds key metabolites.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
Sample particle diameter after grinding in step A is less than 40 mesh.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step A, cryodesiccated vacuum is 0.18 mbar, and temperature is-6 DEG C.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step B 1) described in inner mark solution be 100 μ g/mL to hydroxyl coumaric acid aqueous solution.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step B 1) in ultrasonic frequency be 25 ~ 45 kHz, the time is 20 ~ 30 min.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step B 1) in centrifugal centrifugal force >=5000g.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step B 1) in the vacuum of freeze dryer centrifugal concentrating be 0.18 mbar, temperature is-6 DEG C.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step B 1) described in the concentration of methoxamine solution be 20 mg/ml.
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step B 2) described in the dichloromethane solution of the peach aldehyde that inner mark solution is 100 μ g/mL；Described centrifugal centrifugal force >=
10000g。
Tobacco styles metabonomic analysis methods based on gaschromatographic mass spectrometry the most according to claim 1, its feature exists
In step B, chromatographiccondition is: chromatographic column is DB-5MS (30 mm × 0.25, m × 0.25 μm), temperature programming
Condition is 60 DEG C and keeps 1 min, 5 DEG C/min to rise to 280 DEG C, keeps 15 min；Injector temperature is 250 DEG C；Sample introduction body
Amassing is 1 μ L；Carrier gas is helium；Post flow is 1.1 mL/min；Split ratio is 20:1；Mass spectral analysis condition is: transmission line temperature
It it is 230 DEG C；Ion source temperature 210 DEG C；The solvent delay time of nonpolar metabolite is 2 min, polarity derivatization sample
The solvent delay time is 7 min；Mass scan range is m/z 35-400；Scanning of the mass spectrum speed is 5 Hz.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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