CN105628847A - Method for measuring acetaldehyde-DNA adducts in saliva - Google Patents
Method for measuring acetaldehyde-DNA adducts in saliva Download PDFInfo
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Abstract
The invention discloses a method for measuring acetaldehyde-DNA adducts in saliva, namely a method for measuring Ethylidene-dG and Propano-dG in saliva. The method comprises the following steps: collecting saliva by an OG-500 saliva collecting tube, performing DNA extraction on the saliva, performing enzyme hydrolysis on a DNA solution, and sequentially adding stable isotope internal standards, a reducing agent, NaBH3CN and DNA hydrolase; and performing solid-phase extraction on hydrolysate via Strata-X columella, collecting an eluant, nitrogen-blowing at room temperature till the product is dried, re-dissolving into a water solution of methyl alcohol, and introducing LC-MS/MS system analysis, thereby accurately detecting the content levels of Et-dG and Propano-dG. With stable isotope as internal standard quantitative analyte, errors caused in pretreatment of samples can be reduced, and the selectivity, accuracy and sensitivity of the method are better improved by LC-MS/MS. By selecting and optimizing chromatographic columns and elution conditions, the chromatographic separation process is better improved, the time for chromatographic analysis is shortened, and the consumption of an organic solvent is reduced.
Description
Technical field
The invention belongs to the physical and chemical inspection technical field of saliva sample, relate generally to N in saliva2-ethylidene-guanine (Ethylidene-dG) and 1, N2The determination techniques field of-propyl alcohol-guanine (Propano-dG) DNA adduct is a kind of method adopting liquid chromatography-tandem mass spectrometry instrument (LC-MS/MS) to measure acetaldehyde-DNA adduct in saliva specifically.
Background technology
Acetaldehyde is a kind of pollutent being extensively present in environment matrix. Mainly result from the incomplete combustion of organism, such as industrial gaseous waste, cigarette smoke, motor-vehicle tail-gas etc. Active aldehyde radical do not need through organism metabolism just can nucleophilic group in directtissima organism, as the guanine in nucleic acid, VITAMIN B4, cytosine(Cyt) and thymus pyrimidine form DNA adduct. The main DNA adduct that acetaldehyde is formed comprises N2-ethylidene-guanine (Ethylidene-dG) and 1, N2-propyl alcohol-guanine (Propano-dG), wherein N2-ethylidene-guanine (Ethylidene-dG) is unstable under mononucleotide state, it is necessary at DNA enzymatic hydrolysis stage, it is reduced to N2-ethyl-guanine (Et-dG) just can be detected.
Saliva is the sample collection mode of a kind of non-intrusion type, experimenter is not impacted sample and easily obtains, and is that ready-made available DNA originates. Oral cavity is the target organ that the objectionable constituent such as flue gas directly expose, and correlative study shows that in saliva, the damage of DNA is relevant to oral carcinoma. In saliva, more rich cell type is mouth epithelial cells and white corpuscle, because its life cycle is shorter, in saliva, the content of DNA adduct can show the recent exposure situation of carcinogens more, and saliva has great application prospect in the DNA adduct detecting cigarette and the generation of food carcinogens.
At present, about the analysing and detecting method of DNA adduct report more, mainly contain32Labeling technique, enzyme linked immunological technology (ELISA), high performance liquid chromatography (HPLC-UV) and liquid chromatography-tandem mass spectrometry technology (LC-MS/MS) after P-. Wherein LC-MS/MS is widely used in the detection analysis of DNA adduct due to its higher sensitivity and selectivity. At present, in saliva the analytical procedure of Ethylidene-dG and Propano-dG there is not been reported.
Summary of the invention
The object of the present invention adopts the liquid chromatography-tandem mass spectrometry (measuring method of acetaldehyde-DNA adduct (Ethylidene-dG and Propano-dG) in the saliva that LC-MS/MS technology is set up just based on above-mentioned prior art situation. The method has fast, accurately, the feature such as sensitivity height, can be used in saliva qualitative and quantitative analysis while acetaldehyde-DNA adduct.
It is an object of the invention to be achieved through the following technical solutions:
A measuring method for acetaldehyde-DNA adduct in saliva, the i.e. measuring method of Ethylidene-dG and Propano-dG, comprise following concrete steps:
A, saliva gather: with Oragene DNA saliva collector (OG-500), human saliva is carried out stdn collection.
The extraction of b, saliva DNA: Oragene saliva mixed solution is hatched at least after 1h in 50 DEG C of water-baths, adds Oragene scavenging solution, vortex oscillation, and ice bath hatches 10min; Under room temperature centrifugal; Pipette supernatant liquid in a new Eppendorf tube, add straight alcohol, shake the several seconds gently; Leaving standstill makes DNA molecular precipitate completely, centrifugal and remove supernatant liquor; The aqueous ethanolic solution adding 70% cleans DNA agglomerate. DNA is redissolved with ultrapure water. Detect the content of DNA with NanoDrop2000 ultramicron spectrophotometer at 260nm place, unit (OD) is absorbed for double-stranded DNA one and is equivalent to 50 �� g/mL.
The enzymic hydrolysis of c, DNA and purification enrichment: the 10mMTris-HCl/5mMMgCl that above-mentioned DNA is dissolved in 500 �� L2In damping fluid (pH=7), add 30mgNaBH3CN, is reduced to Et-dG by Ethylidene-dG; Add 20 �� L mix in mark, add 30U deoxyribonuclease ��, in 37 DEG C, hatch 2h, add 0.008U phosphodiesterase I subsequently and 15U alkaline phosphatase hatches 2h at 37 DEG C of resume. Hydrolyzed solution, through Strata-X Solid-Phase Extraction, is collected elutriant liquid nitrogen and is blown to dry, redissolve in 100 �� L30% methanol aqueous solutions, be sample liquid to be measured. The object of this process is to make double-stranded DNA enzymolysis become mononucleotide state, blows concentrated and purified separation and DNA adduct needed for enrichment by Solid-Phase Extraction and nitrogen. Be designated as in described mixing 10ng/mL [15N5] Et-dG and [15N5]Propano-dG��
The preparation of d, standard working solution: Et-dG and the Propano-dG standard operation solution preparing different concns with methyl alcohol respectively.
E, liquid chromatography-tandem mass spectrometry (LC-MS/MS) measure, draw the different concns hybrid standard working solution prepared, inject LC-MS/MS system, obtain equation of linear regression, sample liquid to be measured is measured, record the ratio analyzing thing and interior mark peak area, substitute into unary linear regression equation, try to achieve the content analyzing thing in sample liquid to be measured.
Chromatographic condition: choose ThermoAcclaimTMPolarAdvantageIIC18 chromatographic column (4.6 �� 150mm, 3 ��m), flow visualizing chooses A:0.01% formic acid methyl alcohol and B:10mM ammonium acetate solution, and elution requirement is gradient elution: 0-2min:25%A, 2-17min:35%A, 17-25min:25%A; Flow velocity is 0.38mL/min. Analysis time is 25min, and sample size is 5 �� L.
Mass Spectrometry Conditions: electric spray ion source (ESI), multiple-reaction monitoring positive ion scan mode; Spray voltage: 5500V, ion source temperature: 550 DEG C, the amount of gas curtain gas is 20psi, and atomization gas is 70psi, and dry gas is 75psi, and collision gas is 9psi, injects voltage: 10V, collision energy: 9eV, residence time: 100ms. Monitoring ion pair is Et-dG:296.2 �� 180.2 quota ion pair, 296.2 �� 117.2 qualitative ion pairs; Interior mark [15N5] Et-dG is 271.2 �� 155.2; Propano-dG:338.3 �� 222.1 quota ion pair, 338.3 �� 117.2 qualitative ion pairs; Interior mark [15N5] Propano-dG is 343.2 �� 227.2.
Each analysis thing and interior target MRM parameter are in table 1. Whole analysis process is controlled by AppliedBiosystemsAnalystversion1.5.1 software.
Thing and interior target MRM parameter thereof is analyzed under table 1 multiple-reaction monitoring pattern
* it is quota ion
The linearity range of the inventive method and detection limit:
Series standard working solution is injected LC-MS/MS, obtains standard working curve, equation of linear regression and relation conefficient. The point of Et-dG and Propano-dG typical curve is 0.02,0.05,0.1,0.2,0.3,0.5,1.0 and 2.0ng/mL. Target compound linear good, relation conefficient is all greater than 0.9990. Utilizing and add mark dilution and obtain quantitative limit and the detection limit of method, concentration corresponding to ten times, target peak signal to noise ratio is quantitative limit, and concentration corresponding to three times of signal to noise ratios is detection limit. Analyze the typical curve of thing and quantitative limit and detection limit in table 2.
The standard working curve of table 2 target compound and LOD and LOQ
The inventive method recovery of standard addition and repeatability:
Taking the recovery of standard addition adding calibration method preparation method in saliva DNA sample, altogether have chosen three pitch-based sphere, each pitch-based sphere replication 3 times, the rate of recovery of the method obtained and repeatability, the results are shown in Table 3. The rate of recovery of target compound is between 88.4%-107.5%, and RSD is less than 10%, and the accuracy of method of proof and repeatability result are better.
Recovery of standard addition and the repeatability of thing analyzed by table 3
The method of the present invention overcomes the deficiency of prior art sample treatment, is optimized for the chromatographic condition of acetaldehyde-DNA adduct in saliva, and the correlation detection condition of LC-MS/MS is optimized. Compared with prior art the inventive method has following excellent results:
1. compare with traditional liquid-phase chromatography method, owing to have chosen tandem mass spectrum so that the selectivity of method and sensitivity improve, and are more conducive to the mensuration of the acetaldehyde-DNA adduct of low levels in saliva.
2. present method has easy and simple to handle, quick, accurate, highly sensitive and repeated good advantage.
3. the inventive method adopts stable isotope can reduce the error caused in sample pretreatment process as uantitative analytical thing, and tandem mass spectrometry better improves the selectivity of method and accuracy and sensitivity. By the selection and optimization of chromatographic column and elution requirement, improve chromatographic separation process preferably, shorten the time of stratographic analysis, decrease the consumption of organic solvent.
Accompanying drawing explanation
The total ion current figure of Fig. 1 acetaldehyde-DNA adduct.
Embodiment
The present invention is described further below in conjunction with example, but is not restriction the present invention.
A measuring method for acetaldehyde-DNA adduct in saliva, its test process collects saliva with OG-500 saliva collection tube, and saliva is carried out DNA extraction, and DNA solution is marked in carrying out enzymic hydrolysis and adding stable isotope successively, reductive agent NaBH3CN and DNA lytic enzyme. Hydrolyzed solution, through the little column solid phase extraction of Strata-X, collects elutriant, and under room temperature, nitrogen blows to dry, redissolves in 30% methanol aqueous solution of 100 �� L, introduces LC-MS/MS system and analyzes.
Example 1:
1. instrument and reagent:
The triple quadrupole rods tandem mass spectrometry instrument of ABSCIEX (California, USA applying biological system house), Agilent1200 high performance liquid chromatography (Agilent company of the U.S.), NanoDrop2000 ultramicron spectrophotometer (Sai Mofei scientific & technical corporation of the U.S.), constant incubator (Sai Mofei scientific & technical corporation of the U.S.), nitrogen concentrate drying instrument (Bai Taiqi company of Sweden), Milli-Q water purification system (Merck group of Germany), Analyst1.5.1 data acquisition and procession software.
Deoxyribonuclease ��, alkaline phosphatase (U.S.'s knob Great Britain biotech company), phosphodiesterase I, ammonium acetate, formic acid (Sigma of the U.S.), NaBH3My fourth Reagent Company of CN(Shanghai), methyl alcohol (De Shan Reagent Company of Korea S), Strata-X polymkeric substance pillar (33 ��m, 30mg/1mL, Guangdong F��raud door scientific instrument company limited), Oragene DNA saliva collector (OG-500, DNAGenotek company of Canada). Standard substance Et-dG and Propano-dG and internal standard substance thereof [15N5] Et-dG and [15N5] Propano-dG. Reagent is chromatographically pure.
2. sample preparation:
Saliva gathers: with Oragene DNA saliva collector (OG-500), human saliva is carried out stdn collection.
The extraction of saliva DNA: Oragene saliva mixed solution hatches at least 1h in 50 DEG C of water-baths, adds Oragene scavenging solution, vortex oscillation, and ice bath hatches 10min; Under room temperature centrifugal; Get supernatant liquor and add straight alcohol, shake the several seconds gently; Leaving standstill makes DNA molecular precipitate completely, centrifugal and remove supernatant liquor; The aqueous ethanolic solution adding 70% cleans DNA agglomerate, redissolves DNA with ultrapure water. Detect the content of DNA with NanoDrop2000 ultramicron spectrophotometer at 260nm place, unit is absorbed for double-stranded DNA one and is equivalent to 50 �� g/mL.
The enzymic hydrolysis of DNA and purification enrichment: the 10mMTris-HCl/5mMMgCl that above-mentioned DNA is dissolved in 500 �� L2In damping fluid (pH=7), add 30mgNaBH successively3CN, 20 �� L mix in mark and 30U deoxyribonuclease ��s, in 37 DEG C, hatch 2h, add 0.008U phosphodiesterase I subsequently and 15U alkaline phosphatase hatches 2h at 37 DEG C of resume. Hydrolyzed solution, through Strata-X Solid-Phase Extraction, is collected elutriant liquid nitrogen and is blown to dry, redissolve in 100 �� L30% methanol aqueous solutions as liquid to be measured. Be designated as in described mixing 10ng/mL [15N5] Et-dG and [15N5]Propano-dG��
3. measuring method: draw each 5 �� L of saliva DNA sample after the standardized solution of different concns and pre-treatment, injects LC-MS/MS system and carries out compartment analysis, record the content of acetaldehyde-DNA adduct in sample.
Example 2: as described in Example 1, acetaldehyde-DNA adduct in 5 saliva samples has been carried out detecting (each sample Parallel testing three times) by the method utilizing this research to set up. Establishing criteria curve and calculated by peak area obtain DNA adduct concentration in each sample, according to formula
In calculating each sample of acquisition, DNA adduct is relative to the content of Nucleotide, and result is multiplied by 108It is converted into DNA adduct number/108Individual Nucleotide. Experimental result is in table 4.
The content of acetaldehyde-DNA adduct in table 4 saliva sample
Claims (5)
1. the measuring method of acetaldehyde-DNA adduct in saliva, i.e. N in saliva2-ethylidene-guanine (Ethylidene-dG) and 1, N2The measuring method of-propyl alcohol-guanine (Propano-dG), it is characterised in that: comprise following concrete steps:
A, saliva gather: with Oragene DNA saliva collector (OG-500), human saliva is carried out stdn collection;
The extraction of b, saliva DNA: Oragene saliva mixed solution is hatched at least after 1h in 50 DEG C of water-baths, adds Oragene scavenging solution, vortex oscillation, and ice bath hatches 10min; Under room temperature centrifugal; Pipette supernatant liquid in a new Eppendorf tube, add straight alcohol, shake the several seconds gently; Leaving standstill makes DNA molecular precipitate completely, centrifugal and remove supernatant liquor; The aqueous ethanolic solution adding 70% cleans DNA agglomerate; Redissolve DNA with ultrapure water, detect the content of DNA with NanoDrop2000 ultramicron spectrophotometer at 260nm place, unit (OD) is absorbed for double-stranded DNA one and is equivalent to 50 �� g/mL;
The enzymic hydrolysis of c, DNA and purification enrichment: the 10mMTris-HCl/5mMMgCl that above-mentioned DNA is dissolved in 500 �� L2In damping fluid, add 30mgNaBH3CN, by N2-ethylidene-guanine (Ethylidene-dG) is reduced into N2-ethyl-guanine (Et-dG) detects; Add 20 �� L mix in mark, add 30U deoxyribonuclease ��, in 37 DEG C, hatch 2h, add 0.008U phosphodiesterase I subsequently and 15U alkaline phosphatase hatches 2h at 37 DEG C of resume; Hydrolyzed solution, through Strata-X Solid-Phase Extraction, is collected elutriant liquid nitrogen and is blown to dry, redissolve in 100 �� L30% methanol aqueous solutions, be sample liquid to be measured;
The preparation of d, standard working solution: the N preparing different concns with methyl alcohol2-ethylidene-guanine (Ethylidene-dG), 1, N2-propyl alcohol-guanine (Propano-dG) standard operation solution;
E, liquid chromatography-tandem mass spectrometry (LC-MS/MS) measure, draw the different concns hybrid standard working solution prepared, inject LC-MS/MS system, obtain equation of linear regression, sample liquid to be measured is measured, record the ratio analyzing thing and interior mark peak area, substitute into unary linear regression equation, try to achieve the content analyzing thing in sample liquid to be measured.
2. the measuring method of acetaldehyde-DNA adduct in saliva according to claim 1, it is characterised in that: be designated as in the mixing described in step c 10ng/mL [15N5] Et-dG and [15N5]Propano-dG��
3. the measuring method of acetaldehyde-DNA adduct in saliva according to claim 1, it is characterised in that: step e have chosen ThermoAcclaimTMPolarAdvantageIIC18 chromatographic column, specification 4.6 �� 150mm, 3 ��m, flow visualizing chooses A:0.01% formic acid methyl alcohol, B:10mM ammonium acetate solution, gradient elution, and analysis time is 25min, and sample size is 5 �� L.
4. the measuring method of acetaldehyde-DNA adduct in saliva according to claim 3, it is characterised in that: gradient elution program: 0-2min:25%A, 2-17min:35%A, 17-25min:25%A; Flow velocity is 0.38mL/min; Flow velocity is 0.38mL/min.
5. the measuring method of acetaldehyde-DNA adduct in saliva according to claim 1, it is characterised in that: the condition of tandem mass spectrum detector in step e: electric spray ion source ESI, multiple-reaction monitoring positive ion scan mode; Spray voltage: 5500V, ion source temperature: 550 DEG C, the amount of gas curtain gas is 20psi, and atomization gas is 70psi, and dry gas is 75psi, and collision gas is 9psi, injects voltage: 10V, collision energy: 9eV, residence time: 100ms; Monitoring ion pair is Et-dG:296.2 �� 180.2 quota ion pair, 296.2 �� 117.2 qualitative ion pairs; Interior mark [15N5] Et-dG is 271.2 �� 155.2; Propano-dG:338.3 �� 222.1 quota ion pair, 338.3 �� 117.2 qualitative ion pairs; Interior mark [15N5] Propano-dG is 343.2 �� 227.2.
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